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10, , TERM - 1, , CBSE, 2021-22, , SCIENCE, Strictly Based on CBSE Sample Question Paper, , SAMPLE PAPERS, Visit https://telegram.me/jeeneetaddaofficial for more b, ooks., , Full Marks Pvt Ltd, (Progressive Educational Publishers), An ISO : 9001-2015 Company, , New Delhi-110002

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D:\Full Marks\Support Books\Class-10\English_Medium\Super_20_Science-10_(2021)\Open_Files\0.Prelims\Prelims, \ 05-Oct-2021, Ved_Goswami, Proof-4, Reader’s Sign _______________________, , Date __________, , Published by:, , An ISO : 9001-2015 Company, , 9, Daryaganj, New Delhi-110002, Phone: 011- 40556600 (100 Lines), Website: www.fullmarks.org, E-mail: [email protected], © Publishers, All rights reserved. No part of this publication may be reproduced or transmitted, in any form or by any means, without, permission. Any person who does any unauthorised act in relation to this publication may be liable to criminal prosecution, and civil claims for damages., , Branches:, • Chennai • Guwahati, Marketing Offices:, • Ahmedabad • Bengaluru • Bhopal • Dehradun • Hyderabad • Jaipur • Jalandhar • Kochi, • Kolkata • Lucknow • Mumbai • Patna • Ranchi, , NEW EDITION, , “This book is meant for educational and learning purposes. The author(s) of the book has/have taken all reasonable care, to ensure that the contents of the book do not violate any existing copyright or other intellectual property rights of any, person in any manner whatsoever. In the event the author(s) has/have been unable to track any source and if any copyright, has been inadvertently infringed, please notify the publisher in writing for corrective action.”

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D:\Full Marks\Support Books\Class-10\English_Medium\Super_20_Science-10_(2021)\Open_Files\0.Prelims\Prelims, Reader’s Sign _______________________, \ 05-Oct-2021, Ved_Goswami, Proof-4, , Date __________, , Note from the Publishers, Science Sample Papers-X (Term-1) is a combined book for all subjects,, based on the reduced CBSE syllabus and the latest Sample Papers issued by CBSE, on 2nd September 2021 for 2021-22 (Term-1) Board Examination., Each Sample Paper is developed by highly experienced subject experts as per the, level and the pattern followed by the CBSE. These Sample Papers will familiarise, the students with the questioning pattern of each subject., The book contains 6 Sample Papers (1 issued by CBSE with Marking Scheme and, 5 Sample Papers with Answers). Undoubtedly, students will get some parameter, to evaluate their preparation for better performance, Features of, , Sample Papers, , • Designed exclusively to test the knowledge and preparation level of students., • Latest CBSE Sample Question Paper has been given with Marking Scheme., • Each Sample Paper covers the weightage of each unit/chapter as per the latest, syllabus., • 2 OMR Sheets for Practice, Any suggestions for further improvement of the book will be thankfully received, and incorporated in the next edition., —Publishers, , (iii)

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D:\Full Marks\Support Books\Class-10\English_Medium\Super_20_Science-10_(2021)\Open_Files\0.Prelims\Prelims, Reader’s Sign _______________________, \ 05-Oct-2021, Ved_Goswami, Proof-4, , Date __________, , CONTENTS, 1. Sample Paper 1 (CBSE Sample issued by CBSE on 2nd September, 2021) ................. F–1, 2. Sample Paper 2.............................................................................................................F–16, 3. Sample Paper 3.............................................................................................................F–28, 4. Sample Paper 4.............................................................................................................F–39, 5. Sample Paper 5.............................................................................................................F–50, 6. Sample Paper 6.............................................................................................................F–61, l, , Answers to Sample Papers 2 to 6.................................................................................. F–73, , l, , 2 OMR Sheets, , (iv)

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , COURSE STRUCTURE, CLASS X, EVALUATION SCHEME, THEORY, Units, , Term-I, , Marks, , I, , Chemical Substances-Nature and Behaviour: Chapter 1, 2 and 3, , 16, , II, , World of Living: Chapter 6, , 10, , III, , Natural Phenomena: Chapter 10 and 11, , 14, , Total Theory (Term I), , 40, , Internal Assessment: Term I, , 10, , Grand Total, , 50

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , 1, , Sample Paper–, , [Issued by CBSE on 2nd September, 2021], Time Allowed: 90 Minutes, , Maximum Marks: 40, , General Instructions:, 1. The question paper contains three sections., 2. Section A has 24 questions. Attempt any 20 questions., 3. Section B has 24 questions. Attempt any 20 questions., 4. Section C has 12 questions. Attempt any 10 questions., 5. All questions carry equal marks., 6. There is no negative marking., , SECTION – A, Section — A consists of 24 questions. Attempt any 20 questions from this section., The first attempted 20 questions would be evaluated., Q1. Reema took 5 mL of lead nitrate solution in a beaker and added approximately 4 mL of, potassium iodide solution to it. What would she observe?, , (a) The solution turned red., (b) Yellow precipitate was formed., , (c) White precipitate was formed., (d) The reaction mixture became hot., Q2. Identify gas A in the following experiment., Delivery tube, , Thistle funnel, , Burning of gas A, with a pop sound, , Stand, , Candle, Test tube, Dilute, sulphuric, acid, , bubbles, of gas A, Soap bubble filled, with gas A, , Zinc granules, , Soap solution, , , (a) Nitrogen, (b) Hydrogen, (c) Oxygen, Q3. Which of the following two combinations are correct?, Metal, Gas Evolved, Copper, Yes, (i), Iron, Yes, (ii), Magnesium, No, (iii), Zinc, Yes, (iv), , (a) (i) and (iii), (b) (i) and (iv), (c) (ii) and (iii), F–1, , (d) Carbon dioxide, , (d) (ii) and (iv)

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q4. Which of the following correctly represents a balanced chemical equation?, , (a) Fe(s) + 4H2O(g) → Fe3O4 (s) + 4H2(g), , (b) 3Fe(s) + 4H2O(g) → Fe3O4 (s) + 4H2(g), , (c) 3Fe(s) + H2O(g) → Fe3O4 (s) + H2(g), , (d) 3Fe(s) + 4H2O(g) → Fe3O4 (s) + H2(g), Q5. The given graph depicts a neutralization reaction (acid + alkali, A, 14, → salt + water).The pH of a solution changes as we add excess, B, of acid to an alkali., , Which letter denotes the area of the graph where both acid pH 7, C, and salt are present?, D, , (a) A, (b) B, 0, , (c) C, (d) D, Volume of acid added, Q6. In the reaction of iron with copper sulphate solution:, , CuSO4 + Fe → Cu + FeSO4, , Which option in the given table correctly represents the substance oxidised and the reducing, agent?, Option, Substance Oxidized, Reducing Agent, Fe, Fe, (a), Fe, FeSO4, (b), Cu, Fe, (c), CuSO4, Fe, (d), Q7. The chemical reaction between copper and oxygen can be categorized as:, , (a) Displacement reaction , (b) Decomposition reaction, , (c) Combination reaction , (d) Double displacement reaction, Q8. Which of the given options correctly represents the parent acid and base of calcium carbonate?, Option, , Parent Acid, , Parent Base, , (a), , HCl, , NaOH, , (b), , H2CO3, , Ca(OH)2, , (c), , H3PO3, , CaSO4, , H2SO4, CaSO4, (d), Q9. How will you protect yourself from the heat generated while diluting a concentrated acid?, , (a) By adding acid to water with constant stirring., , (b) By adding water to acid with constant stirring., , (c) By adding water to acid followed by base., , (d) By adding base to acid with constant stirring., Q10. Why is it important to balance a skeletal chemical equation?, , (a) To verify law of conservation of energy., , (b) To verify the law of constant proportion., , (c) To verify the law of conservation of mass., , (d) To verify the law of conservation of momentum., F–2 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q11. Carefully study the diagram of the human respiratory, system with labels (i), (ii), (iii) and (iv). Select the, (i), option which gives correct identification and main, Bronchus, function and /or characteristic., (ii), , (a) (i) Trachea: It is supported by bony rings for Cut end of rib, (iii), conducting inspired air., Lung, , (b) (ii) Ribs: When we breathe out, ribs are lifted., (iv), , (c) (iii) Alveoli: Thin-walled sac like structures for, exchange of gases., , (d) (iv) Diaphragm: It is pulled up when we breathe in., Q12. Identify the option that indicates the correct enzyme that is secreted, in location (i), (ii) and (iii)., (i), , (a) (i)-lipase, (ii)-trypsin, (iii)-pepsin, , (b) (i)-amylase, (ii)-pepsin, (iii)-trypsin, , (c) (i)-trypsin, (ii)-amylase, (iii)-carboxylase, , (d) (i)-permease, (ii)-carboxylase, (iii)-oxidase, (ii), Q13. Opening and closing of stomatal pore depends on:, (iii), , (a) atmospheric temperature, , (b) oxygen concentration around stomata, , (c) carbon dioxide concentration around stomata, , (d) water content in the guard cells, Q14. The given figure shows a schematic plan of blood circulation, (iii), in humans with labels (i) to (iv). Identify the correct label with, (i), its functions?, , (a) (i) Pulmonary vein - takes impure blood from body part., (iv), (ii), , (b) (ii) Pulmonary artery - takes blood from lung to heart., , (c) (iii) Aorta - takes blood from heart to body parts., , (d) (iv) Vena cava takes - blood from body parts to right auricle., Q15. Identify the phase of circulation which is represented in the, given diagram of heart. Arrows indicate contraction of the, chambers shown., , (a) Blood transferred to the right ventricle and left ventricle, simultaneously., , (b) Blood is transferred to lungs for oxygenation and is, pumped into various organs simultaneously., , (c) Blood transferred to the right auricle and left auricle, simultaneously., , (d) Blood is received from lungs after oxygenation and is received from various organs of the, body., Sample Paper–1 n F–3

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q16. Observe the diagram of human digestive system., (i), , Match the labeling referred in column I and correlate with the function in, column II., Column I, Column II, (ii), A., (i) The length of this depends on food the organism eats., B., (ii) Initial phase of starch digestion, (iii), C., (iii) Increases the efficiency of lipase enzyme action, (iv), D., (iv) This is the site of the complete digestion of carbohydrates,, proteins and fats., , (a) A – (i); B – (ii); C – (iii); D – (iv), (b) A – (ii); B – (iii); C – (iv); D – (i), , (c) A – (ii); B – (iv); C – (iii); D – (i), (d) A – (iv); B – (i); C – (ii); D – (iii), Q17. Which of the following mirror is used by a dentist to examine a small cavity in a patient’s teeth?, , (a) Convex mirror , (b) Plane mirror, , (c) Concave mirror , (d) Any spherical mirror, Q18. Which diagram shows image formation of an object on a screen by a converging lens?, 2 × focal length, , 2 × focal length, , , (a), , (b), , Object, , Object, , Screen, , Screen, focal length, , focal length, , , (c), , (d), , Object, , Screen, , Object, , Screen, , Q19. Which of the following can make a parallel beam of light when light from a point source is, incident on it?, , (a) Concave mirror as well as convex lens. (b) Convex mirror as well as concave lens., , (c) Two plane mirrors placed at 90° to each others., , (d) Concave mirror as well as concave lens., Q20. Consider these indices of refraction: glass: 1.52; air: 1.0003; water: 1.333. Based on the, refractive indices of three materials, arrange the speed of light through them in decreasing, order., , (a) The speed of light in water > the speed of light in air > the speed of light in glass., , (b) The speed of light in glass > the speed of light in water > the speed of light in air., (c) The speed of light in air > the speed of light in water > the speed of light in glass., , (d) The speed of light in glass > the speed of light in air > the speed of light in water., F–4 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q21. If a beam of red light and a beam of violet light are incident at the same angle on the inclined, surface of a prism from air medium and produce angles of refraction r and v respectively,, which of the following is correct?, , (a) r = v, (b) r > v, (c) r = 1/v, (d) r < v, Q22. Examine the given figure and state which of the following option, Concave Mirror, is correct? [one small box in the figure is equal to 1 cm], , (a) The mirror has a focal length of –6 cm and will produce an, image of magnification + 1., C, P, F, , (b) The mirror has a focal length of –3 cm and will produce an, image of magnification –1., , (c) The mirror has a focal length of –3 cm and will produce an, image of magnification +1., , (d) The mirror has a focal length of –6 cm and will produce an image of magnification –1., Q23. The angle of incidence from air to glass at the point O on the, Q, hemispherical glass slab is., air, , (a) 45°, (b) 0°, P, , (c) 90°, (d) 180°, glass, Q24. A prism ABC (with BC as base) is placed in different, O, orientations. A narrow beam of white light is incident on the air, prism as shown in below figure. In which of the following, diagrams, after dispersion, the third colour from the top of the spectrum corresponds to the, colour of the sky?, , (i), , (ii), , , (a) (i), , (iii), , (b) (ii), , (iv), , (c) (iii), , (d) (iv), , SECTION – B, Section — B consists of 24 questions (S. No. 25 to 48). Attempt any 20 questions from this, section., The first attempted 20 questions would be evaluated., , Q25. Identify the correct option from the given table which represents the type of reactions occurring, in step 1 and step 2., Heated, , Limestone, , Step 1, , (a), (b), (c), (d), , + H2O, , X + CO2, , endothermic, , , , , , Slaked lime, , Step 2, , exothermic, , , , , Sample Paper–1 n F–5

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q26. In which year is concentration of hydrogen ion the highest?, , pH Value, , 6.00, 5.00, 4.00, 3.00, 2.00, 1.00, 0.00, 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011, , , (a) 2002, (b) 2008, (c) 2011, Q27. The diagram shows the reaction between metal and dil. acid., , Mg +, dil.HCl, , Fe, + dil. HCl, , Zn +, dil. HCl, A, , B, , (d) 2005, , C, , Cu +, dil. HCl, , D, , , What is the reason for different behaviour of Mg in test tube B?, , (a) Mg is lighter element than dil. HCl, , (b) Mg reacts with dil. HCl to produce H2 gas which helps in floating, , (c) Mg reacts with dil. HCl to produce N2 gas which helps in floating, , (d) Mg reacts with dil. HCl to produce CO2 gas which helps in floating, Q28. The table shown below gives information about four substances: A, B, C and D., Substance, , Melting Point (K), , (a), , Electrical Conductivity, Solid, , Liquid/ Aqueous, , 295, , Good, , Good, , (b), , 1210, , Poor, , Good, , (c), , 1890, , Poor, , Good, , (d), , 1160, , Poor, , Poor, , , Identify ionic compounds from the above given substances., , (a) A, B, (b) B, C, (c) A, B, D, (d) A, C, D, Q29. Vinay observed that the stain of curry on a white shirt becomes reddish-brown when soap is, scrubbed on it, but it turns yellow again when the shirt is washed with plenty of water. What, might be the reason for his observation?, , (i) Soap is acidic in nature, , (ii) Soap is basic in nature, , (iii) Turmeric is a natural indicator which gives reddish tinge in bases, , (iv) Turmeric is a natural indicator which gives reddish tinge in acids, , (a) (i) and (ii), (b) (ii) and (iii), (c) (i) and (v), (d) (ii) and (iv), F–6 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q30. In which of the following setups would the bulb glow?, 6 volt battery, , Bulb, , 6 volt battery, , Switch, , , (i), , 6 volt battery, , Beaker, , Switch, , (ii), , Beaker, , Nail, Dilute HCl solution, , Nail, Sugar solution, , Rubber cork, , Rubber cork, , Bulb, , 6 volt battery, , Switch, , , (iii), , Bulb, , Beaker, , Bulb, Switch, , (iv), , Beaker, , Nail, Alcohol in water, , Nail, Lime water, , Rubber cork, , Rubber cork, , (a) (i) and (ii), (b) (i) and (iv), (c) (ii, iii) and (iv), (d) (i, ii) and (iv), Question No. 31 to 34 consist of two statements – Assertion (A) and Reason (R). Answer, these questions selecting the appropriate option given below:, (a) Both A and R are true and R is the correct explanation of A, (b) Both A and R are true and R is not the correct explanation of A, (c) A is true but R is false, (d) A is false but R is true, Q31. Assertion: Fresh milk in which baking soda is added, takes a longer time to set as curd., Reason: Baking soda decreases the pH value of fresh milk to below 6., Q32. Assertion: Decomposition of vegetable matter into compost is an endothermic reaction., Reason: Decomposition reaction involves breakdown of a single reactant into simpler products., Q33. Assertion: Resins and gums are stored in old xylem tissue in plants., Reason: Resins and gums facilitate transport of water molecules., Q34. Assertion: Sky appears blue in the day time., Reason: White light is composed of seven colours., Q35. The table given below shows the reaction of a few elements with acids and bases to evolve, hydrogen gas., Element, Acid, Base, (A), , , (B), , , (C), , , (D), , , , Which of these elements form amphoteric oxides?, , (a) (A) and (D), (b) (B) and (D), (c) (A) and (C), (d) (B) and (D), Sample Paper–1 n F–7

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q36. In which of the following groups of organisms, blood flows through the heart only once during, one cycle of passage through the body?, , (a) Rabbit, Parrot, Turtle , (b) Frog, Crocodile, Pigeon, , (c) Whale, Labeo, Penguin, (d) Shark, Dog fish, Stingray, Q37. What is common between extensive network of blood vessels around walls of alveoli and in, glomerulus of nephron?, , (a) Thick walled arteries richly supplied with blood, , (b) Thin walled veins poorly supplied with blood, , (c) Thick walled capillaries poorly supplied with blood., , (d) Thin walled capillaries richly supplied with blood, Q38. Plants use completely different process for excretion as compared to animals. Which one of, the following processes is not followed by plants for excretion?, , (a) They can get rid of excess water by transpiration., , (b) They selectively filter toxic substances through their leaves., , (c) Waste products are stored as resins and gums in old xylem., , (d) They excrete waste substances into the soil around them., Q39. If the power of a lens is – 4.0 D, then it means that the lens is a, , (a) concave lens of focal length – 50 m, , (b) convex lens of focal length + 50 cm, , (c) concave lens of focal length – 25 cm, , (d) convex lens of focal length – 25 m, Q40. Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object, be placed so that size of its image is equal to the size of the object?, , (a) 30 cm in front of the mirror, (b) 15 cm in front of the mirror, , (c) Between 15 cm and 30 cm in front of the mirror, , (d) More than 30 cm in front of the mirror, Q41. In which of the following groups of organisms, food material is broken down outside the body, and then absorbed in?, , (a) mushroom, green plants, amoeba, (b) yeast, mushroom, bread mould, , (c) paramecium, amoeba, cuscuta, , (d) cuscuta, lice, tapeworm, Q42. In a person the tubule part of the nephron is not functioning at all. What will its effect be on, urine formation?, , (a) The urine will not be formed., , (b) Quality and quantity of urine is unaffected., , (c) Urine is more concentrated., , (d) Urine is more diluted., Q43. If the real image of a candle flame formed by a lens is three times the size of the flame and, the distance between lens and image is 80 cm, at what distance should the candle be placed, from the lens?, , (a) – 80 cm, (b) – 40 cm, (c) – 40/3 cm, (d) – 80/3 cm, F–8 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q44. While looking at the given diagram, Nalini, concluded the following:, Object, , (i) the image of the object will be a virtual one., , (ii) the reflected ray will travel along the same Principal Axis, C, F, path as the incident ray but in opposite, direction., , (iii) the image of the object will be inverted., , (iv) this is a concave mirror and hence the focal, length will be negative., , Which one of the above statements are correct?, , (a) (i) and (ii), (b) (i) and (iii), (c) (ii, iii) and (iv), (d) (i, ii, iii) and (iv), Q45. In the above diagram light is travelling through different media., 1, It is noted by a scientist that ∠1 = ∠3 = ∠4 but ∠2 < ∠1. Which medium 1, of the following statement would be correct?, 2, , (a) Medium 1 is the denser than medium 3 but it’s density is medium 2, equal to medium 2., , (b) Medium 2 is the rarest medium., 3 4, medium 3, , (c) Medium 3 is denser than medium 1., , (d) Medium 1 and 3 are essentially the same medium, but, 4, medium 1, medium 2 is denser than 1 and 3., Q46. The refractive index of flint glass is 1.65 and that for alcohol, is 1.36 with respect to air. What is the refractive index of the flint glass with respect to, alcohol ?, (a) 0.82, (b) 1.21, (c) 1.11, (d) 1.01, Q47. The given lens has a focal length of 10 cm. The object of height 2 mm is placed at a distance, of 5 cm from the pole. Find the height of the image., A′, , A, F2, B′, , F1 B, , O, , , (a) 4 cm, (b) 6.67 mm, (c) 4 mm, (d) 3.33 mm, Q48. A cable manufacturing unit tested few elements on the basis of their physical properties., Properties, , W, , X, , Y, , Z, , Malleable, , Yes, , No, , No, , Yes, , Ductile, , Yes, , No, , No, , Yes, , Electrical conductivity, , Yes, , Yes, , Yes, , No, , Melting Point, , High, , Low, , Low, , High, , , Which of the above elements were dicarded for usage by the company?, , (a) W, X, Y, (b) X, Y, Z, (c) W, X, Z, (d) W, Y, Z, Sample Paper–1 n F–9

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , SECTION – C, Section – C consists of three Cases followed by questions. There are a total of 12 questions, in this section. Attempt any 10 questions from this section., The first attempted 10 questions would be evaluated., , Case I. The Salt Story, From: The New Indian Express 9 March 2021, The salt pans in Marakkanam, a port town about 120 km from Chennai are the third largest, producer of salt in Tamil Nadu. Separation of salt from water is a laborious process and the, salt obtained is used as raw materials for manufacture of various sodium compounds. One, such compound is Sodium hydrogen carbonate, used in baking, as an antacid and in soda, acid fire extinguishers. The table shows the mass of various compounds obtained when 1, litre of sea water is evaporated., Compound, Formula, Mass of Solid Present /g, Sodium Chloride, NaCl, 28.0, Magnesium Chloride, MgCl2, 8.0, Magnesium Sulphate, MgSO4, 6.0, Calcium Sulphate, CaSO4, 2.0, Calcium Carbonate, CaCO3, 1.0, Total Amount of Salt Obtained, 45.0, Q49. Which compound in the table reacts with acids to release carbon dioxide?, , (a) NaCl, (b) CaSO4, (c) CaCO3, (d) MgSO4, Q50. How many grams of magnesium sulphate are present in 135 g of solid left by evaporation of, sea water?, , (a) 6 g, (b) 12 g, (c) 18 g, (d) 24 g, Q51. What is the saturated solution of sodium chloride called?, , (a) Brine, (b) Lime water, (c) Slaked lime, (d) Soda water, Q52. What is the pH of the acid which is used in the formation of common salt?, , (a) Between 1 to 3, (b) Between 6 to 8 (c) Between 8 to 10 (d) Between 11 to 13, Case II. The Figure shown below represents an activity to prove the requirements for photosynthesis., During this activity, two healthy potted plants were kept in the dark for 72 hours. After 72, hours, KOH is kept in the watch glass in setup X and not in setup Y. Both these setups are, air tight and have been kept in light for 6 hours. Then, Iodine Test is performed with one, leaf from each of the two plants X and Y., , Bell jar, Watch-glass, containing, potassium, hydroxide, X, , F–10 n, , Science – X, , Y

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q53. This experimental set up is used to prove essentiality of which of the following requirements, of photosynthesis?, , (a) Chlorophyll , (b) Oxygen, , (c) Carbon dioxide , (d) Sunlight, Q54. The function of KOH is to absorb, , (a) Oxygen., (b) Carbon dioxide. (c) Moisture., (d) Sunlight., Q55. Which of the following statements shows the correct results of iodine test performed on the, leaf from plant X and Y respectively?, , (a) Blue - black colour would be obtained on the leaf of plant X and no change in colour on, leaf of plant Y., , (b) Blue - black colour would be obtained on the leaf of plant Y and no change in colour on, leaf of plant X., , (c) Red colour would be obtained on the leaf of plant X and brown colour on the leaf of plant, Y., , (d) Red colour would be obtained on the leaf of plant Y and brown colour on the leaf of plant, X., Q56. Which of the following steps can be followed for making the apparatus air tight?, , (i) placing the plants on glass plate, , (ii) using a suction pump., , (iii) applying vaseline to seal the bottom of jar., , (iv) creating vacuum, , (a) (i) and (ii), (b) (ii) and (iii), (c) (i) and (iii), (d) (ii) and (iv), Case III. Noor, a young student, was trying to demonstrate some properties of light in her Science, project work. She kept ‘X’ inside the box (as shown in the figure) and with the help of a, laser pointer made light rays pass through the holes on one side of the box. She had a small, butter-paper screen to see the spots of light being cast as they emerged., Ray, , 2, , Ray, , 1, , X, , Ray, , 2, , Ray, , 1, , Q57. What could be the ‘X’ that she placed inside the box to make the rays behave as shown?, , (a) a converging lens , (b) a parallel-sided glass block, , (c) a plane mirror , (d) a triangular prism, Q58. She measured the angles of incidence for both the rays on the left side of the box to be 48.6°., She knew the refractive index of the material ‘X’ inside the box was 1.5. What will be the, approximate value of angle of refraction?, , (a) 45°, (b) 40°, (c) 30°, (d) 60°, , (use the value: sin 48.6° ≈ 0.75), Sample Paper–1 n F–11

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q59. Her friend noted the following observations from this demonstration:, , (i) Glass is optically rarer than air., , (ii) Air and glass allow light to pass through them with the same velocity., , (iii) Air is optically rarer than glass., , (iv) Speed of light through a denser medium is faster than that of a rarer medium., , (v) The ratio: sin of angle of incidence in the first medium to the ratio of sin of angle of, refraction in the second medium, gives the refractive index of the second material with, respect to the first one., , Which one of the combination of the above statements given below is correct., , (a) (ii), (iv) and (v) are correct., , (b) (iii) and (iv) are correct., , (c) (i), (iv) and (v) are correct., , (d) (iii), (v) are correct., Q60. If the object inside the box was made of a material with a refractive index less than 1.5 then, the, , (a) lateral shift of the rays would have been less., , (b) lateral shift of the rays would have been more., , (c) lateral shift of the rays would remain the same as before., , (d) there is not enough information to comment on any of the above statements, , F–12 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , MARKING SCHEME, SECTION-A, 1., 3., 5., 7., 9., 10., 11., 12., 13., 14., 15., , (b) Yellow precipitate was formed., 2. (b) Hydrogen, (d) (ii) and (iv) , 4. (b) 3Fe(s) + 4H2O(g) → Fe3O4 (s) + 4H2(g), (d) D , , 6. (a) Fe and Fe respectively, (c) Combination reaction , 8. (b) H2CO3 and Ca(OH)2, (a) By adding acid to water with constant stirring., (c) To verify the law of conservation of mass., (c) (iii) Alveoli: Thin-walled sac like structures for exchange of gases., (b) (i)-amylase, (ii)-pepsin, (iii)-trypsin, (d) water content in the guard cells, (d) (iv) Vena cava takes - blood from body parts to right auricle., (b) Blood is transferred to lungs for oxygenation and is pumped into various organs, simultaneously., 16. (b) A - (ii), B - (iii), C - (iv), D - (i), 17. (c) Concave mirror, focal length, , 18. (c), , 19., 20., 21., 22., 23., , Object, , Screen, , (a) Concave mirror as well as convex lens., (c) The speed of light in air > the speed of light in water > the speed of light in glass., (d) r < v, (b) The mirror has a focal length of –3 cm and will produce an image of magnification –1., (b) 0° , , 24. (b) (ii), SECTION-B, , 25. (c) , ,  , , , , 26. (a) 2002, , 27. (b) Mg reacts with dil. HCl to produce H2 gas which helps in floating, 28. (b) B, C , , , , 29. (b) (ii) and (iii), , 30. (b) (i) and (iv) , , 31. (c) A is true but R is false, , 32. (d) A is false but R is true , , 33. (c) A is true but R is false, , 34. (b) Both A and R are true and R is not the correct explanation of A, 35. (b) (B) and (D) , , 36. (d) Shark, Dog fish, Stingray, , 37. (d) Thin walled capillaries richly supplied with blood, 38. (b) They selectively filter toxic substances through their leaves., Sample Paper–1 n F–13

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , 39. (c) Concave lens of focal length – 25 cm, , P = – 4D, , , P=, , 100, f (cm), , f(cm) = 100, P, 100, , = – 25 cm., −4, Negative focal length means concave lens. Concave lens of focal length – 25 cm., 40. (a) 30 cm in front of the mirror, If rays converge at a point 15 cm from the mirror, then,,     f = – 15 cm, then, C = – 30 cm, An object kept at C makes an image of the same size as object., 41. (b) yeast, mushroom, bread mould, 42. (d)Urine is more diluted., 43. (d) – 80/3 cm, , m= –3, , v = 80 cm, v, , m=, u, , , , , 80, u, 80 −80, =, u­ =, cm, −3, 3, , –3=, , , 44. (c) (ii, iii) and (iv), 45. (d) Medium 1 and 3 are essentially the same medium, but medium 2 is denser than 1 and 3., 46. (b) 1.21, 1.65, R.I of flint glass, Refractive index of flint glass w.r.t alcohol =, =, = 1.21., 1.36, R.I, of, alcohol, 47. (c) 4 mm, , f = + 10 cm (Convex lens), , h1 = 2 mm = 0.2 cm., , u = –5 cm., 1, 1 1, , = −, f, v 5, , , , , F–14 n, , 1 1, −, 10 5, −1, 10, – 10 cm., v h, m= = 2, u h1, , 1, =, v, 1− 2, =, 10, v=, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , , ⇒, , 48. (b) X, Y, Z, , Date __________, , −10 h2, =, −5 0.2, h2 = 0.4 cm, h2 = 4 cm, m=, , SECTION-C, 49. (c) CaCO3 , , 50. (c) 18 g, 51. (a) Brine , , 52. (a) Between 1 to 3, 53. (c) Carbon dioxide , 54. (b) Carbon dioxide, 55. (b) Blue - black colour would be obtained on the leaf of plant Y and no change in colour on, leaf of plant X., 56. (c) (i) and (iii) , 57. (b) a parallel-sided glass block, 58. (c) 30°, sin i, Refractive index of medium =, sin r, sin 48.6°, sin r, , , , 1.5 =, , , , 0.75, 1.5 = sin r, , 0.75, 1.5, , sin r = 0.5, , r = sin−1 (0.5), , r = 30°, 59. (d) (iii) and (v) are correct., 60. (a) lateral shift of the rays would have been less., , , sin r =, , qqq, , Sample Paper–1 n F–15

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Time: 90 Minutes, , Sample Paper –, , 2, , Date __________, , Maximum Marks: 40, , General Instructions: Same as Sample Paper 1., , SECTION – A, Section — A consists of 24 questions. Attempt any 20 questions from this section., The first attempted 20 questions would be evaluated., Q1. A dilute ferrous sulphate solution was gradually added to the beaker containing acidified, permanganate solution. The light purple colour of the solution fades and finally disappears., Which of the following is the correct explanation for the observation?, , (a) KMnO4 is an oxidising agent, it oxidises FeSO4, , (b) FeSO4 acts as an oxidising agent and oxidises KMnO4, , (c) The colour disappears due to dilution; no reaction is involved, , (d) KMnO4 is an unstable compound and decomposes in presence of FeSO4 to a colourless, compound., Q2. The following diagram shows a flow chart of the process of preparation of NaOH from common, salt, NaCl:, , at Anode, , at Cathode, , X, , Cl2, NaOH, , , Identify the gas, X., , (a) Oxygen, (b) Chlorine, (c) Sodium, (d) Hydrogen, Q3. On the basis of the sequence of the given reactions identify the most and least reactive elements, respectively:, , X + YA → XA + Y, ...(1), , X + YB → XB + Y, ...(2), , Z + XA → ZA + X...(3), , (a) X and Z, (b) Y and Z, (c) Z and X, (d) Z and Y, Q4. In which of the following chemical equations, the abbreviations represent the correct states, of the reactants and products involved at reaction temperature?, , (a) 2H2(l) + O2(l) → 2H2O(g), (b) 2H2(g) + O2(l) → 2H2O(l), , (c) 2H2(g) + O2(g) → 2H2O(l), (d) 2H2(g) + O2(g) → 2H2O(g), F–16

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Iron (II), Chloride, , B, , Sodium, Q5. Chloride, , A, , Hydrogen, Chloride, , Date __________, , Ammonium, Chlooride, , C, , D, , Lead, Chloride, , Here, A, B, C and D respectively are:, , (a) A = Conc. HCl; B = Fe; C = NH4OH; D = PbO, , (b) A = Conc. H2SO4; B = Fe; C = NH4OH; D = Pb(NO3)2, , (c) A = Conc. H2SO4; B = Fe; C = NH3; D = Pb(NO3)2, , (d) A = Conc. HCl; B = Fe; C = NH3; D = PbO, Q6. Which of the following is an antioxidant used in butter?, , (a) BSA , , (b) BHG, (c) BHT , , (d) BHR, Q7. What happens when calcium is treated with water?, , I. It does not react with water, , II. It reacts violently with water, , III. It reacts less violently with water, , IV. Bubbles of hydrogen gas formed stick to the surface of calcium, , (a) (I) and (IV) , (b) (II) and (III), (c) (I) and (II) , (d) (III) and (IV), Q8. A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution, contains, , (a) NaCl , , (b) HCl, (c) LiCl , , (d) KCl, Q9. Which of the following phenomena occur, when a small amount of acid is added to water?, , (I) Ionisation , (II) Neutralisation, (III) Dilution , , (IV) Salt formation, , (a) (I) and (II) , (b) (I) and (III), , (c) (II) and (III) , (d) (II) and (IV), ∆, , → 2KCl + 3O2 is a, Q10. 2KClO3 , , (a) decomposition reaction, , (c) displacement reaction , , (b) combination reaction, (d) redox reaction, Sample Paper – 2 n F–17

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q11. A plant is kept in the dark for two days. A leaf is used in an experiment to investigate the effect, of two factors on photosynthesis as shown in the diagram., , , What are the colours of Q and R, when the leaf is tested for starch, using iodine solution?, Q, R, Brown, (a) Blue/black, Brown, (b) Brown, Blue/black, (c) Blue/black, Blue/black, (d) Brown, Q12. Which substances are produced by anaerobic respiration in yeast?, Carbon dioxide, Alcohol, Lactic Acid, Water, (a), , , , , (b), , , , , (c), , , , , (d), , , , , , Key  = produced,  = not produced, Q13. Which of the following is most appropriate for aerobic respiration?, (a) Glucose mitochondria Pyruvate Cytoplasm CO2 + H2O + Energy, (b) Glucose Cytoplasm Pyruvate mitochondria CO2 + H2O + Energy, (c) Glucose Cytoplasm Pyruvate + Energy mitochondria CO2 + H2O, (d) Glucose Cytoplasm Pyruvate + Energy mitochondria CO2 + H2O + Energy, Q14. The diagram shows a vertical section through the heart., , , What are the functions of the numbered blood vessels?, , , , , , , (a), (b), (c), (d), , F–18 n, , Carries blood of, body, 1, 1, 2, 3, , Carries blood to, lungs, 2, 3, 4, 1, , Science – X, , Carries blood from, lungs, 3, 4, 3, 4, , Carries blood from, body, 4, 2, 1, 2

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q15. The diagram shows part of the human gas exchange system., , , What are W,X,Y and Z ?, , , , , , (a), (b), (c), (d), , Bronchus, W, X, Y, Z, , Bronchiole, X, Z, W, Y, , Larynx, Z, Y, X, W, , Trachea, Y, W, Z, X, , Q16. In the figure given along side, the structures associated with human kidneys are marked (X,Y, and Z ). The relative concentrations of urea in these structures is, , , (a) X is sometimes higher than Y, (b) Y is always higher than Z, , (c) Y is always lower than Z, (d) Z is sometimes lower than X, Q17. The image of an object placed in front of a convex mirror is formed at, , (a) the object itself , , (b) twice the distance of the object in front of the mirror, , (c) half the distance of the object in front of the mirror, , (d) behind the mirror, Q18. Study the given ray diagrams and select the correct statement from the following:, Y, , X, , Screen, 20 cm, , Screen, 25 cm, , , (a) Device X is a concave mirror and device Y is a convex lens, whose focal lengths are, 20 cm and 25 cm respectively., , (b) Device X is a convex lens and device Y is a concave mirror, whose focal lengths are, 10 cm and 25 cm respectively., Sample Paper – 2 n F–19

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , \\, \\\, , , (c) Device X is a concave lens and device Y is a convex mirror, whose focal lengths are, 20 cm and 25 cm respectively., , (d) Device X is a convex lens and device Y is a concave mirror, whose focal lengths are, 20 cm and 25 cm respectively., Q19. Where should an object be placed in front of a convex lens to get a real image of the size of, the object?, , (a) At the principal focus of the lens, (b) At twice the focal length, , (c) At infinity , , (d) Between the optical centre of the lens and its principal focus., Q20. A student obtains a blurred image of a distant object on a screen using a convex lens. To obtain, a distinct image on the screen he should move the lens, , (a) away from the screen , (b) towards the screen, , (c) to a position very far away from the screen, , (d) either towards or away from the screen depending upon the position of the object., Q21. Which of the following phenomena of light are involved in the formation of a rainbow?, , (a) Reflection, refraction and dispersion, , (b) Refraction, dispersion and total internal reflection, , (c) Refraction, dispersion and internal reflection, C, , (d) Dispersion, scattering and total internal reflection, \, A, Q22. AB and CD, two spherical mirrors, form parts of a hollow spherical, ball with its centre at O as shown in diagram. What is the ratio of their, O, focal lengths?, B, , (a) FAB : FCD = 1 : 2, (b) FAB : FCD = 2 : 1, D, , (c) FAB : FCD = 1 : 1, (d) FAB : FCD = 2 : 3, Q23. Figure shows a ray of light as it travels from medium A to medium B. Refractive index of the, medium B relative to medium A is, \\\\\\\\\\\\\\\\\, \, , 1, 3, 2, (b), (c), (d) 2, 2, 2, 3, Q24. Two identical prisms PQR and P′Q′R′ are given. White light is passed through PQR as shown, below., , (a), , P, , t, , f, yo, , e, hit, , ligh, , w, , Ra, , Q, , F–20 n, , Science – X, , R, , R, O, Y, G, B, I, V

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , , Which of the following position of P'Q'R' will again yield white light?, , (a), , (b), , P', , Q', , , (c), , R', , Q', , P', , R', , (d), , Q', , P', , Q', , P', , R', , R', , SECTION – B, Section — B consists of 24 questions (S. No. 25 to 48). Attempt any 20 questions from this, section., The first attempted 20 questions would be evaluated., , Q25. Which of the following is(are) an endothermic process(es)?, , (I) Dilution of sulphuric acid, (II) Sublimation of dry ice (Solid CO2), , (III) Condensation of water vapours, (IV) Evaporation of water, , (a) (I) and (III), (b) (II) only, (c) (III) only, (d) (II) and (IV), Q26. Four samples A, B, C and D were tested by a student using pH paper. He observed some change, in colour in pH paper for all the samples and based on it, inferred the pH of the sample which, is tabulated as follows:, Sample, A, B, C, D, , Colour Change, Green, Orange, Blue, Pink, , pH, 7, 4, 9, 2, , Which of the following samples is most acidic?, , (a) A, (b) B, (c) C, (d) D, Q27. Four metals A, B, C and D are tested with water, steam and dilute HCl and results are tabulated, as follows:, Metals, A, , Water, Do not react, , Steam, React, , Dil. HCl, React, , B, , Do not react, , Do not react, , React, , C, , React, , React, , React, , D, , Do not react, , Do not react, , Do not react, Sample Paper – 2 n F–21

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , , Between which two metals should hydrogen be placed in the series?, , (a) A and D, (b) B and D, (c) C and D, (d) C and A, Q28. In each test tubes A, B, C and D, 2 mL of aqueous solution of Al2(SO4)3 was filled. Clean, pieces of zinc was placed in test tube A, clean iron nail was put in test tube B, silver (Ag) was, placed in test tube C and a clean copper wire was placed in test tube D., , Al2(SO4)3 + Zn, (A), , Al2(SO4)3 + Fe, (B), , Al2(SO4)3 + Ag, (C), , Al2(SO4)3 + Cu, (D), , , Which of the following change observed in test tubes correct?, , (a) Solution turns light green in test tube B, , (b) Solution turns white from colourless in test tube A, , (c) Solution turns blue in test tube D., , (d) No change is observed in test tubes A, B, C and D, Q29. Common salt besides being used in kitchen can also be used as the raw material for making, , (I) washing soda , (II) bleaching powder, , (III) baking soda , (IV) slaked lime, , (a) (I) and (II) , (b) (I), (II) and (IV), , (c) (I) and (III) , (d) (I), (III) and (IV), Q30. Acetic acid was added to a solid X kept in a test tube. A colourless and odourless gas was, evolved. The gas was passed through lime water which turned milky. It was concluded that., , (a) Solid X is sodium hydroxide and the gas evolved is CO2, , (b) Solid X is sodium bicarbonate and the gas evolved is CO2, , (c) Solid X is sodium acetate and the gas evolved is CO2, , (d) Solid X is sodium chloride and the gas evolved is CO2, Question No. 31 to 34 consist of two statements – Assertion (A) and Reason (R). Answer, these questions selecting the appropriate option given below:, (a) Both A and R are true and R is the correct explanation of A, (b) Both A and R are true and R is not the correct explanation of A, (c) A is true but R is false, (d) A is false but R is true, Q31. Assertion: If the pH inside the mouth decreases below 5.5, the decay of tooth enamel begins., Reason: The bacteria present in mouth degrades the sugar and left over food particles, and produce acids that remains in the mouth after eating., , Q32. Assertion: In the following chemical equation,, CuO(s) + Zn(s) → ZnO(s) + Cu(s), , Zinc is getting oxidised and copper oxide is getting reduced., , Reason: The process in which oxygen is added to a substance is called oxidation whereas the, process in which oxygen is removed from a substance is called reduction., Q33. Assertion: Translocation of sugar occurs through the phloem., Reason: It is achieved by diffusion of sugars through phloem., F–22 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q34. Assertion: Sun appears reddish in the morning. It will not be observed on moon., , Reason: It is because moon does not have atmosphere, therefore, light will not scatter., Q35. There are four metals K, L, M and N. Identify them by using the hints given below:, , K forms basic oxide., L forms amphoteric oxide., Oxide of M dissolved in water to form alkali., N does not react with water at all., , (a) K → Zn, L → Al, M → Na, N → Fe, (b) K → Fe, L → Na, M → K, N → Zn, , (c) K → K, L → Cu. M → Pb, N → Na, (d) K → Cu, L → Zn, M → K, N → Pb, Q36. What prevents backflow of blood inside the heart during contraction?, , (a) Valves in heart, , (b) Thick muscular walls of ventricles, , (c) Thin walls of atria , (d) All of the above, Q37. Correct sequence of following events which occurs during photosynthesis is, , (i) Absorption of light energy., , (ii) Conversion of light energy to chemical energy and splitting of water molecules into, hydrogen and oxygen., , (iii) Reduction of carbon dioxide to carbohydrates., , (a) (i), (iii) and (ii) (b) (i), (ii) and (iii) (c) (ii), (i) and (iii), (d) (ii), (iii) and (i), Q38. Separation of right and left side of the heart is to, , (a) ensure proper and efficient working of heart, , (b) avoid any blockage, , (c) allow highly efficient supply of oxygen, , (d) all of these, Q39. The power of a lens is + 1.6 D. The nature of lens is, , (a) convex lens , (b) concave lens, , (c) both concave an convex, (d) none of these, Q40. The radius of curvature of a mirror is 20 cm the focal length is, , (a) 20 cm, (b) 10 cm, (c) 40 cm, (d) 5 cm, Q41. Organisms using parasitic nutritive strategy is, , (a) Cuscuta and lice , (b) Ticks and tape worm, , (c) Leeches , (d) All of these, Q42. Complete digestion of carbohydrates, proteins and fats takes place in, , (a) Stomach, (b) Large intestine, (c) Small intestine, (d) Villi, Q43. Convex lens forms a real, point sized image at focus, the object is placed, , (a) at focus, (b) between F and 2F (c) at infinity, (d) at 2F, Q44. The angle of reflection in the given figure is, , C, , , (a) 90°, , (b) 180°, , (c) 0°, , (d) 30°, Sample Paper – 2 n F–23

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q45. When you focus the image of a distant flag, whose shape is given below, on a screen using a, convex lens, the shape of the image as it appears on the screen is:, , , (a), , (b), , , (c), , (d), , Q46. A ray of light travelling in air falls obliquely on the surface of a calm pond. It will:, , (a) go into the water without deviating from its path, , (b) deviate away from the normal, , (c) deviate towards the normal, , (d) turns back on its original path, Q47. A divergent lens has a focal length of 20 cm. At what distance should an object of height, 4 cm from the optical centre of the lens be placed so that its image is formed 10 cm away, from the lens?, , , (a) 20 cm, (b) 10 cm, (c) –10 cm, (d) –20 cm, Q48. The electronic structures of six elements A to F are given in the table below:, Electronic Structure, , Formula of compound, , (i) A : 2, 1, , B : 2, 6, , A2B, , (ii) B : 2, 6, , C : 2, 7, , B2C, , (iii) C : 2, 7, , D : 2, 8, 3, , DC3, , (iv) E : 2, 8, 6, , F : 2, 8, 8, 2, , FE3, , , Which of the compounds formed are wrong?, , (a) (i) and (iii), (b) (ii) and (iii), (c) (iii) and (iv), F–24 n, , Science – X, , (d) (ii) and (iv)

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , SECTION – C, Section – C consists of three Cases followed by questions. There are a total of 12 questions, in this section. Attempt any 10 questions from this section., The first attempted 10 questions would be evaluated., , Study these tables related to blood pressure and answer the questions that follow:, Table I, Systolic Pressure, , Diastolic Pressure, 60 mm Hg, , 90 mm Hg, , 2., , 60 mm Hg, , 3., , 50 mm Hg, , 33 mm Hg, , 4., , 130 mm Hg, , 85 mm Hg, , 5., , 120 mm Hg, , 6., , 110 mm Hg, , 7., , 210 mm Hg, , 120 mm Hg, , 8., , 180 mm Hg, , 110 mm Hg, , 9., , 160 mm Hg, , 10., , 140 mm Hg, , HIGH, , NORMAL, , LOW, , 1., , 40 mm Hg, , 80 mm Hg, 75 mm Hg, , 100 mm Hg, 90 mm Hg, , Table II, Age, , Female, , Male, , 1-2, , 80/34 to 120/75, , 83/38 to 117/76, , 3-10, , 100/59 to 111/73, , 100/61 to 112/73, , 10-18, , 113/74 to 120/80, , 19-24, , 120/79, , 25-29, , 120/80, , 30-35, , 122/81, , 36-39, , 123/82, , 40-45, , 124/83, , 46-49, , 126/84, , 50-55, , 129/85, , 128/85, , 56-59, , 130/86, , 131/87, , 60+, , 134/84, , 135/88, , NORMAL BLOOD PRESSURE, , Case I., , 114/74 to 120/80, 120/79, 121/80, 123/82, 124/83, 125/83, 127/84, , Sample Paper – 2 n F–25

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q49. Which instrument is used to measure blood pressure and what is its normal range in general?, , (a) Sphygmomanometer, 80/100, , (b) Manometer, 80/140, , , (c) Sphygmomanometer, 120/80, , (d) Barometer, 120/80, , Q50. If you are 15 years female and your blood pressure is 140/90, what will you infer?, , (a) Hypertension, , (b) Anaemia, , (c) Low blood pressure (d) None of these., , Q51. Refer to the Table I and suggest the value of mean blood pressure level beyond which doctor’s, advice is necessary for your father with age 45?, , (a) 130/85, , (b) 120/80, , (c) 110/75, , (d) 160/100, , Q52. Which one of the following diets would you recommend to patient of high blood pressure?, , (a) High sugar, low fat, low salt, , (b) Low sugar, low fat, low salt, , , (c) High sugar, high fat, low salt, , (d) High sugar, low fat, high salt, , Case II. Sodium chloride obtained from sea water or from lakes contains many impurities such, as sulphates of sodium and magnesium along with chlorides of calcium and magnesium., The chlorides of calcium and magnesium are particularly undersirable on account of their, deliquescent nature., For its purification, common salt is dissolved in minimum quantity of water to get a, saturated solution from which insoluble impurities are filtered off. Then hydrogen chloride, gas is passed through the saturated solution and the crystals of pure NaCl separate out., The soluble impurities remain in the mother liquor. The crystals are filtered, washed and, dried., Q53. Select the correct statement regarding pure NaCl., , (a) It is hygroscopic (absorb water from air) in nature., , (b) It is soluble in alcohol., , (c) It is not hygroscopic, it shows hygroscopic nature due to impurities., , (d) It is a brown crystalline solid., Q54. Nature of aqueous solution of common salt is:, , (a) acidic, , (b) alkaline, , (c) basic, , (d) neutral, , Q55. Which of the following compounds is alkaline in aqueous medium?, , (a) Na2CO3, , (b) NaCl, , (c) H2CO3, , Q56. Some statements regarding salt NaCl are given below:, , (I) It is prepared by chlor-alkali process., , (II) It is a white crystalline substance., (III) It also exists in the form of rocks and is called rock salt., (IV) It is a neutral salt, pH value of NaCl is 7., F–26 n, , Science – X, , (d) CuSO4

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Select the correct statements., , (a) (II) and (III) only , , (b) (III) and (IV) only, , , (c) (I) and (IV) only , , (d) (II), (III) and (IV) only, , Case III. The atmosphere reflects, scatters, and absorbs solar radiation, reducing the amount of, sunlight that reaches Earth’s surface. Some atomospheric gases absorb specific wavelengths, of solar radiation. Water vapour is a strong absorber of incoming infrared energy, causing, a significant reduction in the amount of solar radiation reaching the ground during humid, conditions. Ozone, during its formation and dissociation, absorbs harmful ultraviolet, radiation that can lead to sunburn and skin cancer. Haze, dust, smoke, and air pollutants, in general block incoming solar energy to some extent wherever present. Clouds strongly, reflect, scatter, and absorb incoming sunlight. High, thin circus absorb some sunlight while, dense clouds, if thick enough, can produce almost night time conditions., Q57. What is solar radiation?, (a) Energy radiated from the sun in all directions, (b) Energy radiated from earth in all directions, (c) Radiation travelling in space, (d) Energy radiated from sun that travels in one direction only, Q58. What type of radiation does earth emit?, (a) UV, , (b) Visible, , (c) Infrared, , (d) Longitudinal, , Q59. The ozone layer absorbs what range of wavelengths of the sun’s radiation?, (a) 0.80 nm – 1.50 nm , , (b) 200 nm – 315 nm, , (c) 450 nm – 570 nm , , (d) 600 nm – 750 nm, , Q60. What factors affect the amount of solar energy that reaches the earth's surface?, (a) Cloud cover, air pollution,, , (b) Latitude of a location, , (c) Time of the year , , (d) All of the above, qqq, , Sample Paper – 2 n F–27

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Time: 90 Minutes, , Sample Paper –, , 3, , Date __________, , Maximum Marks: 40, , General Instructions: Same as Sample Paper 1., , SECTION – A, Section — A consists of 24 questions. Attempt any 20 questions from this section., The first attempted 20 questions would be evaluated., Q1. Four students were asked to study the reaction between solution of BaCl2 and sodium sulphate., On mixing the solutions of the two salts in a test tube, they reported their experiments as, follows:, , (a) The colour of mixture became brown, (b) The solution forms separate layers, , (c) A colourless mixture is obtained, (d) A white substance settles at the bottom, Q2. In the given set up, the bulb glows when the solution X is in the beaker. Then the solution X, must be, , , (a) an acid only , (b) a base only, , (c) any covalent compound, (d) any ionic compound, Q3. A reactive metal (M) is treated with H2SO4 (dil). The gas is evolved and is collected over the, water as shown in the figure., , The correct conclusion drawn is/are, , (a) the gas is hydrogen , (b) the gas is lighter than air, , (c) the gas is SO2 and is lighter than air, (d) Both (a) and (b), Q4. Consider reaction: Al(s) + O2(g) → Al2O3(s). Moles of Al(s) needed to balance the equation, are:, , (a) 1, (b) 2, (c) 3, (d) 4, F–28

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q5. Select the incorrect option, Indicator, , Colour in acidic, medium, , Colour in basic, medium, , A., , Litmus (Purple), , Red, , Blue, , B., , Phenolphthalein (Colourless), , Colourless, , Pink, , C., , Red cabbage juice (Purple), , Red or Pink, , Green, , D., , Turmeric Juice (Yellow), , Colourless, , Yellow, , , (a) B, (b) A, (c) D, (d) C, Q6. Which of the following gases can be used for storage of fresh sample of an oil for a long time?, , (a) Carbon dioxide or oxygen, (b) Nitrogen or oxygen, , (c) Carbon dioxide or helium, (d) Helium or nitrogen, Q7. Metal M reacts with oxygen to form metallic oxide MO. This oxide reacts with moisture and, carbon dioxide of the atmosphere to form a basic carbonate metal M. The metal ‘M’ is, , (a) Cu, (b) Fe, (c) Zn, (d) Cr, Q8. The acid used in making of vinegar is, , (a) formic acid, (b) acetic acid, (c) sulphuric acid, (d) nitric acid, Q9. The pH of a solution is 4.0. What should be the change in the hydrogen ion concentration of, the solution, if its pH is increased to 5.0., , (a) Decreased to 1/10 of its original concentration, , (b) Halved, (c) Doubled, (d) Increased by 10 times, Q10. Which of the following reactions is an endothermic reaction?, , (a) Burning of coal, , (b) Decomposition of vegetable matter into compost, , (c) Process of respiration, , (d) Decomposition of calcium carbonate to form quick lime and carbon dioxide, Q11. The table shows the characteristics of blood in one blood vessel of the body., Oxygen, concentration, High, , Carbon dioxide, concentration, Low, , Pressure, High, , , Which blood vessel contains blood with these characteristics?, (a) Aorta, (b) Pulmonary artery (c) Pulmonary vein, (d) Vena cava, Q12. The diagram shows the ribs and some of the muscles used in breathing., , Sample Paper – 3 n F–29

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Which muscles relax in moving from position X to position Y ?, Diaphram, , External Intercostals, , (a), , No, , No, , ( b), , No, , Yes, , (c), , Yes, , No, , (d), , Yes, , Yes, , Q13. An experiment is set up as shown. Flasks 1 and 2 contain lime water. Air is pumped through, the flasks., , , What is the appearance of lime water in flasks 1 and 2 after a period of ten minutes?, Flask 1, , Flask 2, , (a), , White, , White, , (b), , White, , Clear, , (c), , Clear, , White, , (d), , Clear, , Clear, , Q14. The diagram represents a section through the small intestine., , , What is the role of the structure labelled X ?, (a) They help to move the food along, (b) They make a large surface area for absorption, (c) They protect against bacteria, (d) They move mucus over the surface, F–30 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q15. The diagram given below represents the liver, kidney and some associated blood vessels., Identify the vessel from the labelled parts A-D in which the blood will contain the lowest, concentration of urea., , (a) A, , (b) B, , (c) C, , (d) D, , Q16. Which of the following statements about the autotrophs is incorrect?, , (a) They synthesise carbohydrate from carbon dioxide and water in the presence of sunlight, and chlorophyll, (b) They store carbohydrates in the form of starch, (c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight, (d) They constitute the first trophic level in food chains, Q17. Under which of the following conditions a concave mirror can form a real image larger than, the actual object?, , (a) When the object is kept at a distance equal to its radius of curvature, , (b) When object is kept at a distance less than its focal length, , (c) When object is placed between the focus and centre of curvature, , (d) When object is kept at a distance greater than its radius of curvature, Q18. A beam of light is incident through the holes on side A and emerges out of the hole on the, other face of the box as shown in the figure. Which of the following could be inside the box?, , , (a) Concave lens , , (b) Rectangular glass slab, , , (c) Prism, , (d) Convex lens, , , , Q19. Which of the following lenses would you prefer to use while reading small letters found in a, dictionary?, , (a) A convex lens of focal length 50 cm., (b) A concave lens of focal length 50 cm., , (c) A convex lens of focal length 5 cm., (d) A concave lens of focal length 5 cm., Sample Paper – 3 n F–31

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q20. Light waves, , (a) require air or another gas to travel through, , (b) require an electric field to travel through, , (c) require a magnetic field to travel through, , (d) can travel through perfect vacuum, Q21. At noon the sun appears white as, , (a) light is least scattered, , (b) all the colours of the white light are scattered away, , (c) blue colour is scattered the most, , (d) red colour is scattered the most, Q22. The angle of reflection in the given figure is, , C, , , (a) 90°, (b) 180°, (c) 0°, (d) 30°, Q23. Which statement best describes the property of light waves illustrated in the diagram below?, , , (a) some materials absorb light waves., , (b) some materials refracted by some materials., , (c) light waves are refracted by some materials., , (d) light waves are emitted by some materials., Q24. After tracing the path of a ray of light through a glass prism a student marked the angle of, incidence (∠i), angle of refraction (∠r), angle of emergence (∠e) and the angle of deviation, (∠D) as shown in the diagram. The correctly marked angles are:, , r, i, , , (a) ∠i and ∠r, F–32 n, , (b) ∠i and ∠e, Science – X, , D, , e, , (c) ∠i, ∠e and ∠D, , (d) ∠i, ∠r and ∠e

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , SECTION – B, Section — B consists of 24 questions (S. No. 25 to 48). Attempt any 20 questions from this, section., The first attempted 20 questions would be evaluated., , Q25. Identify the following type of reaction:, Heat, 2KClO3 ( s ) Catalyst, , , → 2KCl(s ) + 3O 2 ( g ), , , (a) It is a combination reaction., , (b) It is a decomposition reaction and is accompanied by release of heat., , (c) It is a photochemical decomposition reaction and exothermic in nature., , (d) It is a decomposition reaction and is endothermic in nature., Q26. For solutions P, Q, R and S are tested on different indicators and the result is tabulated as, follows:, Indicator, Methyl Orange, Phenolphthalein, Turmeric, , P, Red, Colourless, Yellow, , Colour Observed, Q, R, Red, Yellow, Colourless, Pink, Yellow, Reddish Brown, , S, Yellow, Pink, Reddish Brown, , Which of the following statements is correct, , (a) Solution P and Q is basic, (b) Solution R and S is acidic, , (c) Solution P and Q is neutral, (d) Solution P and Q is acidic, Q27. A metal rod (M) was dipped in a coloured solution (Y). After some time it was observed that, the metal rod starts dissolving in the solution and the solution starts fading in colour. However,, a coloured precipitate (Z) was seen at the bottom of the beaker. (M), (Y) and (Z) could be:, M, Y, Z, , , (a) M = Zn, Y = FeSO4, Z = Fe, (b) M = Cu, Y = Al2(SO4)3, Z = Al, , (c) M = Ag, Y = CuSO4, Z = Cu, (d) M = Fe, Y = ZnSO4, Z = Zn, Q28. Which of the following are correct about ionic compounds., , (I) Sharing of electrons , (II) Conduct electricity in solid state, , (III) Soluble in water , (IV) High melting point, , (a) (I) and (II), (b) (III) and (IV), (c) (I) and (III), (d) (II) and (IV), Q29. Sodium carbonate is a basic salt because it is a salt of, , (a) strong acid and strong base, (b) weak acid and weak base, , (c) strong acid and weak base, (d) weak acid and strong base, Sample Paper – 3 n F–33

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q30. An acid (A) with sodium hydrogen carbonate is used in making the cakes fluffy and spongy., It is due to the release of (B) gas in the reaction. Here, A and B are, (a) A : Oxalic acid : B : CO2, (b) A : Tartaric acid : B : O2, (c) A : Succinic acid : B : H2, (d) A : Tartaric acid : B : CO2, Question No. 31 to 34 consist of two statements – Assertion (A) and Reason (R). Answer, these questions selecting the appropriate option given below:, (a) Both A and R are true and R is the correct explanation of A, (b) Both A and R are true and R is not the correct explanation of A, (c) A is true but R is false, (d) A is false but R is true, Q31. Assertion: Conc H2SO4 should be added slowly into water to get dilute acid with constant, cooling., , Reason: Dilution of conc. H2SO4 is highly exothermic reaction., Q32. Assertion: In a reaction., Zn(s) + CuSO4 (aq) → ZnSO4 (aq) + Cu(s), , Zn is a reductant but itself get oxidized., , Reason: In a redox reaction, oxidant is reduced by accepting electrons and reductant is oxidized, by losing electrons., Q33. Assertion: In woody plants, gaseous exchange occurs through lenticels., , Reason: Lenticels are specialised cells found along with stomata on the stem of woody plants., Q34. Assertion: A white light on passing through prism splits into its component colours such that, the red light emerges nearest to the base of the prism., , Reason: Wavelength of red light is more than other component colours and hence, red light, deviates least., Q35. Metal M reacts with oxygen to form metallic oxide MO. This oxide reacts with moisture and, carbon dioxide of the atmosphere to form a basic carbonate metal M. The metal ‘M’ is:, , (a) Cu, (b) Fe, (c) Zn, (d) Cr, Q36. The blood plasma without fibrinogen is called, , (a) serum, (b) bone marrow, (c) liquid tissue, (d) none of these., Q37. Swelling of guard cells lead to, (a) Opening of stomatal pores, (b) Closing of stomatal pores, (c) Both (i) and (ii) , (d) None of these, Q38. Function of chlorophyll in photosynthesis is, , (a) Absorbing light energy, (b) Breaking down H2O molecule, , (c) No function , (d) Reduction of CO2, Q39. The refractive indices of some media are given below:, , F–34 n, , Medium, , Refractive index, , X, Y, Z, W, , 1.51, 1.72, 1.83, 2.42, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , , In which of these is the speed of light minimum and maximum, respectively., , (a) X-minimum, W-maximum, , (b) Z-minimum, W-maximum, , , (c) W-minimum, X-maximum, , (d) X-minimum, Z-maximum, , Q40. The mirror that always gives virtual and erect image of the object but image of smaller size, than the size of the object is, , (a) plane mirror, , (b) concave mirror, , (c) convex mirror, , (d) none of these, , Q41. Correct equation for photosynthesis is, , (a) CO2 + 12H2O → C6H12O6 + 6CO2 + H2O, , (b) CO2 + 6H2O → C6H12O6 + 6CO2 + H2O, , , (c) 6CO2 + H2O → C6H12O6 + CO2 + 12H2O, , , (d) 6CO2 + 12H2O → C6H12O6 + 6O2 + 6H2O, , Q42. Amount of water reabsorbed in nephrons depend on:, , (a) how much excess water is there in the body, , (b) how much dissolved water there is to be excreted, , (c) rate of intake of food, , (d) both (a) and (b), Q43. If the object is placed at focus of a concave mirror, the image is formed at, , (a) infinity , , , , , (c) centre of curvature , , (b) focus, (d) between F and P., , Q44. Consider the following diagram in which L is a lens and P is an object and Q is its magnified, image formed by the lens., , State the type of the lens L and one characteristic property of the image Q., (a) Convex lens and image is virtual, (c) Concave lens and image is real, , (b) Convex lens and image is real, (d) Concave lens and image is virtual, , Q45. The angle between an incident ray and the plane mirror is 35°. The total angle between the, incident ray and reflected ray will be:, , (a) 35° , , (b) 70°, , (c) 105° , , (d) 110°, Q46. An object is situated at a distance of f /2 from a convex lens of focal length f. Distance of, image will be:, , (a) + (f /2) , , (c) + (f /4) , , , , , (b) + (f /3), (d) –f, Sample Paper – 3 n F–35

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q47. A convex lens A of focal length 20 cm and a concave lens B of focal length 5 cm are kept, along the same axis with a distance d between them as shown in figure. If a parallel beam of, light falling on A leaves B as a parallel beam, then the distance d in cm will be:, A, , B, d, , , (a) 25, (b) 15, (c) 30, (d) 50, Q48. Which of the following metals can displace ‘G’ from its salt solution?, , (a) E, , Metal, , Reaction with water, , Reaction with steam, , E, , None, , Mild, , F, , Mild, , Vigorous, , G, , Very slow, , Vigorous, , H, , Vigorous, , Violent, , (b) F, , (c) H, , (d) Both F and H, , SECTION – C, Section – C consists of three Cases followed by questions. There are a total of 12 questions, in this section. Attempt any 10 questions from this section., The first attempted 10 questions would be evaluated., , Case I. O,  rchids grow best if the soil has pH between 5.5 to 6.8. An orchid grower tested various, soils. The chart shows the results., Farmers who wish to increase the nitrogen content of soil can add ammonium salts as, fertilizer., 9, 8, 7, , pH, , 6, 5, 4, 3, 2, 1, A, , Q49. Which soil is best for orchid?, , (a) A, (b) B, F–36 n, , Science – X, , B, , C, , (c) C, , D, , (d) D

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q50. Why calcium hydroxide should not be added along with ammonium salts?, , (a) It makes soil extremely acidic, , (b) It makes soil extremely basic, , (c) It decreases nitrogen content in soil as Ca(OH)2 reacts with NH3 to form salt, , (d) None of these., , Q51. The pH of NH4NO3 in aqueous solution will be, , (a) 7 , , , , (b) 10, , , (c) 5 , , , , (d) 11, , Q52. What is colour of phenolphthalein in ammonium hydroxide?, , (a) Colourless , , (b) Orange, , , (c) Yellow , , (d) Pink, Case II. The leaf is the main photosynthesis organ in a plant. It controls gas exchange in plants,, controls the amount of water loss in plants. Upper epidermis cells contain no chloroplasts –, which is not true for the guard cells. They form layers on the upper and lower surfaces of the, leaf. Their function is to prevent water from getting out and stopping unwanted substances/, organisms getting in. The palisade mesophyll layer is where most of the photosynthesis, occurs in the leaf. The palisade cells contain a lot of chloroplasts to help them perform this, photosynthesis. Lower epidermis is the bottom layer of the leaf, and is one cell thick. They, may not contain a cuticle within the lower epidermis, there are some holes found in leaves, called stoma. These holes allow gases to diffuse in and out of the leaves. The stoma are, formed by two highly specialised epidermis cells, called guard cells. Guard cells are the, only epidermis cells that contain chloroplasts., Midrib, , Lamina or, leaf blade, Vein, , Phloem Xylem, Vascular bundle, , Waxy, cuticle, Upper, epidermis, , Chloroplast, , Pallisade, tissue, , Air spaces, Mesophyll, tissue, Guard cell, , Lower, epidermis, , Stomatal pore, , Sample Paper – 3 n F–37

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q53. Name the cell organelle in which photosynthesis occur, (a) Mitochondria , , (b) Cytoplasm, , (c) Chloroplast , , (d) Protoplasm, , Q54. Select the function/s of lower epidermis, , (a) Allow carbon dioxide and oxygen to move in and out of the plant, , (b) A protective layer of cells, (c) The lower epidermis possesses a cuticle layer, (d) Both (a) & (b), Q55. Where are chloroplasts present in the leaf?, (a) Upper epidermis , , (b) Guard cells and Palisade cells, , (c) Inner membrane , , (d) Outer membrane, , Q56. Select the statement which is not correct regarding upper epidermis, (a) Upper epidermis contains large number of stomata., (b) This is a single layer of cells containing few or no chloroplasts, (c) The upper surface is covered with a waxy, waterproof cuticle, (d) None of the above, Case III. Atishay went to a dentist due to tooth-ache where he observed that the dentist uses a small,, hand-held mirror to examine his teeth and gums from a variety of angles. He found that, the mirror gives a magnified reflection of the mouth which is easier for the dentist to see., He decided to make a dentist mirror. He bought three mirrors, M1, M2 and M3 out of which, M1 was curved inwards, M2 was curved outwards and M3 shows lateral inversion., Read the above passage carefully and give the answer of the following questions:, Q57. What kind of mirror would Atishay need to make the dentist mirror?, (a) Plane mirror , , (b) Concave mirror, , (c) Convex mirror , , (d) Acoustic mirror, , Q58. The laws of reflection hold good for:, (a) M1 only , , , , (b) M3 only, , (c) M2 only , , , , (d) M1, M2 and M3, , Q59. A full length image of a distant tall building can definitely be seen by Atishay using:, (a) mirror M1 , , (b) mirror M2, , (c) mirror M3 , , (d) Both M1 and M3, , (a) less than one , , (b) more than 1, , (c) equal to 1 , , (d) more or less than 1, , Q60. Magnification produced by mirror M3 is always:, , qqq, F–38 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Sample Paper –, , Time: 90 Minutes, , 4, , Date __________, , Maximum Marks: 40, , General Instructions: Same as Sample Paper 1., , SECTION – A, Section — A consists of 24 questions. Attempt any 20 questions from this section., The first attempted 20 questions would be evaluated., Q1. Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium, chloride. Which of the following correctly represents the type of the reaction involved?, , I. Displacement reaction, II. Precipitation reaction, , III. Combination reaction , IV. Double displacement reaction, (a) I only, (b) II only, (c) IV only, (d) II and IV, Q2. Which of the following combinations of X and Y will evolve hydrogen in the following setup:, , X, Y, , , (a) X - NaOH, Y - Zn , (b) X - C2H5OH, Y - Zn, , (c) X - NaCl, Y - Zn , (d) X - HCl, Y - Cu, Q3. An experimental set-up is shown in the figure. Identify the metal (X) and gas (Y) respectively, in the figure., Metal X, Glass-wool, soaked, with water, , Gas Y, Water, , Burner, , , (a) Zinc, H2 gas , (c) Aluminium, CO2 gas , , Gas jar, , (b) Copper, CO2 gas, (d) Platinum, H2 gas, F–39

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Q4. In the following equations:, , Na2CO3 + x HCl → 2NaCl + CO2 + H2O, the value of x is:, , (a) 1, (b) 2, (c) 3, Q5. The table provides the pH value of four solutions P, Q, R and S, Solution, , pH value, , P, , 2, , Q, , 9, , R, , 5, , S, , 11, , Date __________, , (d) 4, , , Which of the following correctly represents the solutions in increasing order of their hydronium, ion concentration?, , (a) P > Q > R > S, (b) P > S > Q > R, (c) S < Q < R < P, (d) S < P < Q < R, Q6. The rust on iron articles has chemical formula, , (a) Fe2O3, (b) FeO, (c) Fe(OH)2, (d) Fe2O3.xH2O, Q7. Which one of the following metals do not react with cold as well as hot water?, , (a) Na, (b) Ca, (c) Mg, (d) Fe, Q8. Which of the following acid is present in sour milk?, (a) Glycolic acid, (b) Lactic acid, (c) Citrus acid, (d) Tartaric acid, Q9. The pH of a solution is 5.0. Its hydrogen ion concentration is decreased by 100 times, the, solution will be:, , (a) more acidic, (b) basic, (c) neutral, (d) unaffected, Q10. Formation of CuO from copper and oxygen denotes, , (a) reduction , (b) oxidation, , (c) redox reaction , (d) none of these, Q11. The correct sequence of anaerobic reactions in yeast is, (a) Glucose, , Cytoplasm, , Pyruvate, , mitochondria, , (b) Glucose, , Cytoplasm, , Pyruvate, , Cytoplasm, , Lactic acid, , (c) Glucose, , Cytoplasm, , Pyruvate, , mitochondria, , Lactic acid, , (d) Glucose, , Cytoplasm, , Pyruvate, , Cytoplasm, , Ethanol + Carbon dioxide, , Ethanol + Carbon dioxide, , Q12. When a person eats some egg white, proteins and water enter the stomach. Which substances, are found leaving the stomach and leaving the small intestine?, Leaving the Stomach, , Leaving the Small Intestine, , (a), , Amino acids and water, , Amino acids and water, , (b), , Fatty acids, glycerol and water, , Fatty acids, glycerol and water, , F–40 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , (c), , Protein and water, , Fatty acids and glycerol, , (d), , Protein, amino acids and water, , Water, , Date __________, , Q13. Figure given below is representing the dialysis machine for removing nitrogenous wastes in, patient with a kidney failure., , Which substances out of the following in the dialysis fluid should be at a lower concentration, than in the blood of patient?, (a) Glucose and urea , (b) Glucose and amino acids, (c) Salts and urea , (d) Glucose and salts, Q14. Observe the figure given below which represents the control of water concentration in the, blood., Water in blood rising, Water in blood falling, , More water, in urine, , Loss water in urine, , This is negative feedback system because, (a) It decreases the amount of water in the blood, (b) It increases any change occurring in the amount of water in the blood, (c) It reverses any change occurring in the amount of water in the blood, (d) It increases the amount of water in the blood, Q15. The diagram represents a part of human circulatory system. Where is the blood pressure, highest?, , (a) A, , (b) B, , (c) C, , (d) D, Sample Paper – 4 n F–41

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q16. The diagram shows parts of a flowering plant. Where does the most transpiration take place?, , (Q), Lower, surface, of leaf, , (P), Upper, surface, of leaf, , (R), Stem, , (c), Root, (a) P, (b) Q, (c) R, (d) S, Q17. Which of the following can make a parallel beam of light when light from a point source is, incident on it?, , (a) Concave mirror as well as convex lens, , (b) Convex mirror as well as concave lens, , (c) Two plane mirrors placed at 90° to each other, , (d) Concave mirror as well as concave lens, Q18. One-half of a convex lens is covered with a black paper. An object is placed at 2F1 of this, covered lens, then the correct ray diagram for the formation of image is, , (a), , (b), , M, , A, , F2, , B, 2F1, , O, , F1, , A, 2F1, , F1, , O, , A, 2F1, , F1, , F2, , N, , 2F2, , O, , A', , F2, 2F2, , N, , (d), , M, , B, , B', , 2F2, B', A', , N, , , (c), , M, , B, , M, , B, A, 2F1, , F1, , O, , F2 A', , 2F2, , B', , N, , Q19. Magnification produced by a rear view mirror fitted in vehicles, , (a) is less than one, , (b) is more than one, , (c) is equal to one, , (d) can be more than or less than one depending upon the position of the object in front of it, Q20. Focal length of a plane mirror is, , (a) zero , , (b) infinite, , (c) 25 cm , , (d) -25 cm, F–42 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q21. Twinkling of stars is due to atmospheric, , (a) dispersion of light by water droplets, , (b) refraction of light by different layers of varying refractive indices, , (c) scattering of light by dust particles, , (d) internal reflection of light by clouds, Q22. Consider the following diagram in which M is a mirror and P is an object and Q is its magnified, image formed by the mirror., Q, M, , P, O, C, , F, , Which of the followings is correct about mirror M and the image Q?, , (a) M is a convex mirror and Q is a virtual image., , (b) M is a concave mirror and Q is a real image., , (c) M is a convex mirror and Q is a real image, , (d) M is a concave mirror and Q is a virtual image., Q23. If a light ray IM is incident on the surface AB as shown, identify the correct emergent ray., I, , M, A, , B, , D, , N, , C, , O, , R, , Q, , S, , P, , , (a) P , , (b) Q, , (c) R , , (d) S, Q24. Which of the following figures correctly represents the passage of white light through prism?, , (a), , (b), t, , ite, , h, lig, , ht, , R, , ite, , Wh, , lig, , V, , Wh, , R, , V, , , (c), , (d), ite, , Wh, , l, , t, igh, , ht, , ite, , lig, , Wh, , Sample Paper – 4 n F–43

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , SECTION – B, Section — B consists of 24 questions (S. No. 25 to 48). Attempt any 20 questions from this section., The first attempted 20 questions would be evaluated., , Q25. Which of the following reactions is a double displacement reaction as well as precipitation, reaction?, , (a) NH3(g) + HCl(g) → NH4Cl(s), , (b) Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq), , (c) 2Mg(s) + O2(g) → 2MgO(s), , (d) CaO(s) + H2O(l) → Ca(OH)2(aq), Q26. In a science laboratory, four beakers with different solutions are placed on a desk. Each beaker, has a label of the H+ ion concentration of the corresponding solution as shown:, [H+] = 10–12, , [H+] = 10–9, , [H+] = 10–7, , [H+] = 10–6, , A, , B, , C, , D, , Which of the given beakers has the most acidic solution?, , (a) A, (b) B, (c) C, (d) D, Q27. Which one of the following properties is not generally exhibited by ionic compounds?, (a) Solubility in water , (c) High melting and boiling points, , (b) Electrical conductivity in solid state, (d) Electrical conductivity in molten state, , Q28. The table shows the reaction of different metals with water. Identify the correct order of, reactivity of metals., Metal, , Reaction of water, , Reaction with Steam, , E, , None, , Mild, , F, , Mild, , Vigorous, , G, , Very Slow, , Vigorous, , H, , Vigorous, , Violent, , , (a) E < F < G < H, (b) E < G < F < H, (c) E < G < H < F, (d) H < G < F < E, Q29. During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed, through the guard tube containing calcium chloride. The role of calcium chloride taken in the, guard tube is to, , (a) absorb the evolved gas, (b) moisten the gas, , (c) absorb moisture from the gas, (d) absorb Cl– ions from the evolved gas, Q30. You are having five solutions A, B, C, D and E with pH values as follows:, , A = 1.8, B = 7, C = 8.5, D = 8 and E = 5, , Which solution would be most likely to liberate hydrogen with magnesium powder?, , (a) Solution A and B (b) Solution A, (c) Solution C, (d) All of the above, F–44 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Question No. 31 to 34 consist of two statements – Assertion (A) and Reason (R). Answer, these questions selecting the appropriate option given below:, (a) Both A and R are true and R is the correct explanation of A, (b) Both A and R are true and R is not the correct explanation of A, (c) A is true but R is false, (d) A is false but R is true, Q31. Assertion: Copper sulphate solution turns blue litmus red., , Reason: Copper sulphate is salt of strong acid H2SO4, weak base Cu(OH)2, therefore, acidic, in nature., Q32. Assertion: Chips and other snacks become rancid due to oxidation., , Reason: To prevent the food like chips and other snacks they are packed in carbon dioxide, gas., Q33. Assertion: Digestion breaks large complex molecules to simple smaller molecules which can, be easily absorbed., Reason: Digestion is necessary for the absorption of all molecules., Q34. Assertion: Higher the refracting index of the prism material lower is the angle of deviation., , Reason: The angle of deviation is inversely proportional to the angle of prism., Q35. Which among the following statements is incorrect for magnesium metal?, , (a) It burns in oxygen with a dazzling white flame, , (b) It reacts with cold water to form magnesium oxide and evolves hydrogen gas, , (c) It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas, , (d) It reacts with steam to form magnesium hydroxide and evolves hydrogen gas, Q36. Which of the following statement(s) is (are) true about respiration?, , (I) During inhalation, ribs move inward and diaphragm is raised, , (II) In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into, blood and carbon dioxide from blood into alveolar air, , (III) Haemoglobin has greater affinity for carbon dioxide than oxygen, , (IV) Alveoli increase surface area for exchange of gases, , (a) (I) and (IV), (b) (II) and (III), (c) (I) and (III), (d) (II) and (IV), Q37. The transport of soluble products of photosynthesis is known as, (a) Evaporation, (b) Translocation, (c) Transpiration, (d) Conduction, Q38. After digestion, proteins, carbohydrates and fats are respectively converted into, (a) Glucose, fatty acids and glycerols, (b) Amino acids, glucose and fatty acids, (c) Amino acids, glucose, fatty acids and glycerol, (d) Glucose, glycerol and fatty acids, Q39. A ray of light passes from a medium A to another medium B. No bending of light occurs if, the ray of light hits the boundary of medium B at an angle of:, , (a) 0°, (b) 45°, (c) 90°, (d) 120°, Sample Paper – 4 n F–45

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q40. In order to obtain a magnification of –0.75 with a convex lens of focal length 8 cm, the object, should be placed:, , (a) at less than 8 cm , (b) between 8 cm and 16 cm, , (c) beyond 16 cm , (d) at 16 cm, Q41. The opening and closing of the stomatal pore depends upon, , (a) oxygen , , (b) temperature, , (c) water in guard cells , (d) concentration of CO2 in stomata, Q42. Which of the following is an incorrect statement?, , (a) Organisms grow with time, , (b) Organisms must repair and maintain their structure, , (c) Movement of molecules does not take place among cells, , (d) Energy is essential for life processes, Q43. Two thin lenses of power, +3.5 D and –2.5 D are placed in contact, then the power and focal, length of the lens combination is:, , (a) +1 D, +100 cm , (b) +2 D, +150 cm, , (c) +1 D, +200 cm , (d) +2 D, +100 cm, Q44. An object AB is placed in front of a convex lens at its focus as shown in figure., L, , A, B, , F, , F, , Which of the ray diagram below correctly depicts the refraction through the lens L?, , (a), , , (c), , A, B, , A, B, , (b), F, , F, , (d), F, , F, , A, B, , A, B, , F, , F, , F, , F, , Q45. Find the angle of incidence and angle of reflection from the diagram:, , Mirror, surface, , , (a) 35°, 35°, F–46 n, , (b) 55°, 55°, Science – X, , 35°, , (c) 60°, 60° , , (d)30°, 30°

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q46. A spherical mirror and a thin spherical lens each have a focal length of –15 cm. The mirror, and the lens are likely to be:, , (a) both concave, , (b) both convex, , (c) the mirror is concave and the lens is convex, , (d) the mirror is convex, but the lens is concave, Q47. Which of the following ray diagrams is correct for the ray of light incident on a lens shown, in given figure—, , F, , (a), , (c), , F, , O, , F, , F, , O, , F, , O, , F, , (b), , F, , O, , (d), , F, , F, , O, , F, , Q48. In an experiment each of the metals Al, Zn, Cu and Fe are reacted with ZnSO4, CuSO4,, Al2(SO4)3 and FeSO4 solutions. The results are tabulated as follows where ‘’ means that the, reaction occurs and ‘’ means no reaction occurs., Metal, , ZnSO4, , CuSO4, , Al2(SO4)3, , FeSO4, , Zn, , , , , , , , , , Cu, , , , , , , , , , Al, , , , , , , , , , Fe, , , , , , , , , , , On the basis of the above results, the order of the reactivity of the metals may be concluded as:, (a) Zn > Fe > Al > Cu , (c) Zn > Al > Fe > Cu , , (b) Al > Fe > Zn > Cu, (d) Al > Zn > Fe > Cu, , SECTION – C, Section – C consists of three Cases followed by questions. There are a total of 12 questions, in this section. Attempt any 10 questions from this section., The first attempted 10 questions would be evaluated., , Case I. Ammonia is manufactured industrially from nitrogen and hydrogen by the Haber’s process, using Fe as catalyst according to the equation:, Sample Paper – 4 n F–47

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , N2(g) + 3H2(g)  2NH3(g), , Q49. Under what pressure higher percentage of NH3 can be obtained?, , (a) 200 atm, (b) 400 atm, (c) 600 atm, (d) 800 atm, Q50. Under what condition of temperature higher percentage of NH3 can be obtained., , (a) 300° C, (b) 400° C, (c) 500° C, (d) 600° C, Q51. What type of reaction is involved in Haber’s Process?, , (a) Displacement, (b) Endothermic, (c) Exothermic, (d) Decomposition, Q52. If we consider decomposition of ammonia back into nitrogen and hydrogen molcules then the, reaction is favoured by, , (a) low temperature and high pressure, (b) low temperature and low pressure, , (c) high temperature and high pressure, (d) high temperature and low pressure, Case II. During inhalation, the diaphragm is contracted which increases the volume of the lung, cavity. During exhalation, the diaphragm is relaxed which decreases the volume of the, lung cavity. The given graph is related to the changes in the volume of lungs of a person, at a rest over a period of 20 seconds., , Volume of air in lungs/(dm3), , 4, 1, , 3, , R, Q, , S, , 2, P, , 1, , 0, , 1, , 2, , 0, 3, , 0, 4, , 0, 5, , 0, 6, , 0, 7, , 0, 8, , 9, 0, , 10, , 11, , 12, , 13, , 14, , 15, , 16, , Time (s), , Q53. How many breaths per minute is the person taking when at rest?, (a) 60, (b) 15, (c) 40, F–48 n, , Science – X, , (d) 20, , 17, , 18, , 19, , 20

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q54. Which two points in the graph (P, Q, R, or S), shows inspiration and expiration respectively?, (a) Q, R, (b) Q, S, (c) P, Q, (d) R, S, Q55. Which of the following muscles help during inhalation?, (a) External intercostal muscles, (b) Internal intercostal muscles, (c) Both (a) and (b) , (d) None of the above, Q56. Which is the correct sequence of air passage during inhalation?, (a) Nostrils → larynx → pharynx → trachea → lungs, (b) Nasal passage → trachea → pharynx → larynx → alveoli, (c) Larynx → nostrils → pharynx → lungs, (d) Nostrils → pharynx → larynx → trachea → alveoli, Case III. Shivani wanted to study the formation of different types of images by spherical lenses., So she bought two lenses X and Y. Out of which when an object is placed 10 cm in front, of lens X, the image is real, inverted, magnified and formed at a great distance. But when, the same object is placed 10 cm in front of lens Y, the image formed is real, inverted and, of same size as the object., Q57. What is the focal length of lens X?, (a) 10 cm, (b) 5 cm, (c) 20 cm, (d) 15 cm, Q58. What is the focal length of lens Y?, (a) 5 cm, (b) 20 cm, (c) 15 cm, (d) 10 cm, Q59. Linear magnification produced by lens Y can be:, (a) less than 1 or more than 1, (b) less than 1 or equal to 1, (c) less than 1, more than 1 or equal to 1, (d) more than 1 or equal to 1, Q60. Lens X produces a magnification of +5. The object is placed:, (a) beyond 2F1 , (b) at less than F1, (c) between F1 and 2F1 , (d) at focus, qqq, , Sample Paper – 4 n F–49

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Time: 90 Minutes, , Sample Paper –, , 5, , Date __________, , Maximum Marks: 40, , General Instructions: Same as Sample Paper 1., , SECTION – A, Section — A consists of 24 questions. Attempt any 20 questions from this section., The first attempted 20 questions would be evaluated., Q1. When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black, precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the, solution. The reaction is an example of a:, (a) Combination reaction , (b) Displacement reaction, (b) Decomposition reaction, (d) Double displacement reaction, Q2. A student performed an experiment using zinc granules and sodium carbonate with sodium, hydroxide and hydrochloric acid under different conditions as shown here:, , dil. HCl, +, Na2CO3, , I, , II, , dil. NaOH, , dil. HCl, +, Na2CO3, , IV, III, , , He would observe that no gas is evolved in the setup:, , (a) I, (b) II, (c) III, (d) IV., Q3. Four group of students were assigned separately the experiment of interaction of an iron nail, with a solution of copper sulphate. Each group recorded the observations as given below in the, table. Which group of students recorded the observations correctly?, , Group of, Students, , Initial colour of, soln., , Final colour of, soln., , Change in iron, nail, , (a), (b), (c), (d), , Blue, Green, Blue, Blue, , Colourless, Green, Blue, Light green, , Grey coat, Brown coat, Brown coat, Brown coat, , F–50

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q4. The addition of water in lime is, , (a) endothermic reaction , (b) decomposition reaction, , (c) exothermic reaction , (d) displacement reaction, Q5. A student placed a few drops of liquid over a portion of the blue litmus paper as shown here., He observed that the blue litmus paper turned red. The liquid could be:, Liquid, Red, Tile, Blue litmus paper, , , (a) dilute hydrochloric acid, (b) dilute sodium hydroxide, , (c) dilute sodium bicarbonate solution, (d) water., Q6. Which one of the following metals do not react with cold as well as hot water?, (a) Na, (b) Ca, (c) Mg, (d) Fe, Q7. Reddish-brown copper metal forms a black solid on combustion. Which of the following, statement is incorrect?, , (a) Black solid is CuO. , (b) The reaction is a redox reaction., , (c) The reaction is a precipitation reaction. (d) Copper is being oxidised., Q8. A solution reacts with crushed egg-shells to give a gas that turns lime water milky., The solution contains:, (a) NaCl, (b) HCl, (c) LiCl, (d) KCl, Q9. One of the constituents of baking powder is sodium hydrogencarbonate, the other constituent, is, (a) hydrochloric acid , (b) tartaric acid, (c) acetic acid , (d) sulphuric acid, Q10. Which information is not conveyed by a balanced chemical equation?, (a) Physical states of reactants and products, (b) Symbols and formulae of all the substances involved in a particular reaction, (c) Number of atoms/molecules of the reactants and products formed, (d) Whether a particular reaction is actually feasible or not, Q11. A destarched leaf on a potted plant was covered with two strips, one black (A) and other, transparent (B), as shown in figure. After 6 hours of exposure to sunlight the leaf was removed, from the plant and tested for the presence of starch., , A, Black, strip, , B, Transparent, strip, , , Which of the following will be the correct observation?, (a) Whole leaf would turn blue-black., (b) Only portion covered with strip B would turn blue-black., Sample Paper – 5 n F–51

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , (c) The parts of the leaf covered with strips A and B would remain colourless while the rest, of the leaf would turn blue-black., (d) Only the portion covered with strip A would remain colourless while the rest of the leaf would, turn blue-black., Q12. Which structure out of 1, 2, 3, and 4 marked in the given diagram of the epidermal peel of, leaf should be labelled as stoma?, , (a) 1, (b) 2, (c) 3, (d) 4, Q13. Observe the given diagram of alimentary canal and identify which of the following is used to, store the bile secreted by the liver., , P, S, , R, Q, , (a) P, (b) Q, (c) R, (d) S, Q14. Which substances will be present in the glomerular filtrate of the kidneys of a mammal?, Glucose, , Protein, , Salts, , (a), , , , , , , , (b), , , , , , , , (c), , , , , , , , (d), , , , , , , , , Key  = present,  = absent, Q15. Pulmonary artery carries blood, , (a) away from the heart , , (c) none of these , F–52 n, , Science – X, , (b) towards the heart, (d) both of these

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q16. Match Group (A) with Group (B), (A), (B), (C), (D), , Group A, Autotrophic nutrition, Heterotrophic nutrition, Parasitic nutrition, Digested in food vacuoles, , Group B, (i), (ii), (iii), (iv), , Leech, Paramecium, Deer, Green plant, , , (a) (A)–(iv), (B)–(iii), (C)–(ii), (D)–(i), (b) (A)–(iii), (B)–(iv), (C)–(ii), (D)–(i), , (c) (A)–(iii), (B)–(i), (C)–(iv), (D)–(ii), (d) (A)–(iv), (B)–(iii), (C)–(i), (D)–(ii), Q17. All the distances in case of spherical mirror are measured in relation to, (a) object to image , (b) the pole of the mirror, (c) the focus of the mirror , (d) the image to the object., Q18. Which of the following ray diagrams is correct for the ray of light incident on a concave mirror, as shown in figure?, , , (a), , (b), , , (c), , (d), , 2F, , F, , C, , F, , P, , P, , Q19. Which of the following can make a parallel beam of light when light from a point source is, incident on it?, (a) Concave mirror as well as convex lens, (b) Convex mirror as well as concave lens, (c) Two plane mirrors placed at 90° to each other, (d) Concave mirror as well as concave lens, Q20. If the refractive indices for water and diamond relative to air are 1.33 and 2.1 respectively,, then the refractive inde of diamond relative to water is, , (a) 0.55, (b) 1.80, (c) 3.19, (d) 2.1, Q21. A prism is used to, , (a) change the path of light by reflection and refraction both, , (b) rotate the image, , (c) disperse the light into its components, , (d) all of these, Sample Paper – 5 n F–53

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q22. Parallel rays from a distant tree, incident on a concave mirror forms an image on the screen., Which of the following image depicts the correct image formation on the screen?, , (a), , (b), , , (c), , (d), , Q23. The correct path of a ray of light passing from air to kerosene oil and from kerosene oil to, water is shown correctly in one of the figure below. Identify the correct diagram., , (a), , , (c), , (b), , Air, , Air, , Oil, , Oil, , Water, , Water, , (d), , Air, , Air, , Oil, , Oil, , Water, , Water, , Q24. In the given setup of two prisms, white light enters from prism P1 and the light emits from P2, to the screen is also white light. Which of the following coloured light is represented by X?, , , (a) Violet, F–54 n, , (b) Red, Science – X, , (c) Blue, , (d) White

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , SECTION – B, Section — B consists of 24 questions (S. No. 25 to 48). Attempt any 20 questions from this, section., The first attempted 20 questions would be evaluated., , Q25. Heating of limestone produces, , (a) slaked lime, (b) quick lime, (c) lime water, (d) caustic soda, Q26. When a white powder was mixed with dilute acid, odourless gas was produced which turned, lime water milky. The white powder is, (a) any hydride salt , (b) any bicarbonate salt, (c) dry ice , , (d) any metal salt, Q27. The electronic configuration of three element X, Y and Z are, X – 2, 8, Y – 2, 8, 6, Z – 2, 8, 1, , Which of the following is correct?, (a) X is a metal , (b) Z is a non-metal, (c) Y is a metal , (d) X and Y are non-metal and Z is a metal, Q28. Which one of the following properties is not generally exhibited by ionic compounds?, (a) Solubility in water , (b) Electrical conductivity in solid state, (c) High melting and boiling points, (d) Electrical conductivity in molten state, Q29. If a few drops of a concentrated acid accidentally spills over the hand of a student, what should, be done?, (a) Wash the hand with saline solution, (b) Wash the hand immediately with plenty of water and apply a paste of sodium, hydrogencarbonate, (c) After washing with plenty of water apply solution of sodium hydroxide on the hand, (d) Neutralise the acid with a strong alkali, Q30. A student added acetic acid to the test tubes I, II, III and IV, , , The lighted candle would be extinguished when placed near the mouth of the test tube:, , (a) I and II, (b) II and III, (c) II and IV, (d) I and IV, Sample Paper – 5 n F–55

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Question No. 31 to 34 consist of two statements – Assertion (A) and Reason (R). Answer, these questions selecting the appropriate option given below:, (a) Both A and R are true and R is the correct explanation of A, (b) Both A and R are true and R is not the correct explanation of A, (c) A is true but R is false, (d) A is false but R is true, Q31. Assertion: Quicklime reacts vigorously with water releasing a large amount of heat., , Reason: The above chemical reaction is an exothermic reaction., Q32. Assertion: All the arteries (except pulmonary artery) carry oxygenated blood from the heart, to various organs., , Reason: Pulmonary vein carries deoxygenated blood to the heart., Q33. Assertion: The molecules of air and fine particles of atmosphere have size smaller than, wavelength of visible light., , Reason: Blue light is scattered more than red light because red light has higher wavelength, than blue light., Q34. Assertion: If the pH inside the mouth decreases below 5.5, the decay of tooth enamel begins., , Reason: The bacteria present in mouth degrades the sugar and left over food particles and, produce acids that remains in the mouth after eating., Q35. The total given below shows the action of acids and bases on indicators., Indicators, , Acidic Solution, , Basic Solution, , Neutral Solution, , Blue litmus, , Red, , No change, , No change, , Red litmus, , No change, , Blue, , No change, , Methyl orange, , Red, , Yellow, , Orange, , Phenolphthalein, , Colourless, , Pink, , Colourless, , Which of the following options is correct?, , (a) Alkalis change blue litmus to red, (b) Phenolphthalein in KOH is colourless, , (c) Methyl orange in water is orange, (d) Acids change red litmus to blue., Q36. Which of the following statement(s) is (are) true about heart?, , (i) Left atrium receives oxygenated blood from different parts of body while right atrium, receives deoxygenated blood from lungs, , (ii) Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps, deoxygenated blood to lungs, , (iii) Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts, , (iv) Right atrium receives deoxygenated blood from different parts of the body while left, ventricle pumps oxygenated blood to different parts of the body, , (a) (i), (b) (ii), (c) (ii) and (iv), (d) (i) and (iii), Q37. Single circulation i.e., blood flows through the heart only once during one cycle of passage, through the body, is exhibited by, (a) Labeo, Chameleon, Salamander, (b) Hippocampus, Exocoetus, Anabas, (c) Hyla, Rana, Draco , (d) Whale, Dolphin, Turtle, F–56 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q38. The blood leaving the tissues becomes richer in, , (a) carbon dioxide, (b) water, (c) haemoglobin, (d) oxygen, Q39. An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find, the position and nature of the image., , (a) 6 cm behind the mirror, (b) 6 cm in front of mirror, , (c) 3 cm behind the mirror, (d) 3 cm in front of mirror, Q40. A concave lens of focal length, f forms an image which is n times the size of object. The, distance of object from the lens is, , (a) (1 – n)f, , (b) (1 + n)f, ,  1+ n , (c) , f,  n , , 1 − n, (d) , f,  n , , Q41. In which part of the alimentary canal, food is finally digested?, , (a) Stomach , (b) Mouth cavity, , (c) Large intestine , (d) Small intestine, Q42. The part of the digestive system where no digestion takes place is, , (a) ileum, (b) stomach, (c) mouth, (d) oesophagus, Q43. When object moves closer to a concave lens the image by it shift, , (a) away from the lens on the same side of object, , (b) toward the lens, , (c) away from the lens on the other side of lens, , (d) first towards and then away from the lens, Q44. Large number of thin stripes of black paint are made on the surface of a convex lens of focal, length 20 cm to catch the image of a white horse., The image will be, , (a) a half horse without any black stripes, (b) a horse of black stripes, (c) a horse of less brightness, (d) a horse of high brightness, Q45. An object is placed 40.0 cm in front of a convex mirror. The image appears 15 cm behind the, mirror. What is the focal length of the mirror?, , (a) +24 cm, (b) +11 cm, (c) – 11 cm, (d) – 24 cm, Q46. An experiment to trace the path of a ray of light through a glass was performed by four, students A, B, C and D. They reported the following measurements of angle of incidence i,, angle of refraction r and angle of emergence e., Student, , ∠i, , ∠r, , ∠e, , A, , 30º, , 30º, , 20º, , B, , 40º, , 50º, , 40º, , C, , 40º, , 30º, , 48º, , D, , 40º, , 30º, , 40º, Sample Paper – 5 n F–57

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , , Which student performed the experiment correctly?, , (a) Student A, (b) Student B, (c) Student C, (d) Student D, Q47. A student focussed the image of a distant object using a device X on a white screen S as, shown in the figure. If the distance of the screen from the device is 30 cm, what is the focal, length of device and name the device X?, , S, , X, , 30 cm, , , (a) 15 cm, concave mirror , (b) 15 cm, convex mirror, , (c) 30 cm, concave mirror , (d) 30 cm, convex mirror, Q48. Metal oxides of zinc, magnesium and copper were heated with the different metals and the, result will tabulated in the given table. Identify X, Y and Z from the given table., Metal, , Zinc, , Magnesium, , Copper, , Zinc oxide, , No reaction, , Displacement, , X, , Magnesium oxide, , Y, , No reaction, , No reaction, , Copper oxide, , Displacement, , Z, , No reaction, , (a), (b), (c), (d), , X–No reaction, Y–No reaction, Z–No reaction, X–No reaction, Y–Displacement, Z–No reaction, X–No reaction, Y–Displacement, Z–Displacement, X–No reaction, Y–No reaction, Z–Displacement, , SECTION – C, Section – C consists of three Cases followed by questions. There are a total of 12 questions, in this section. Attempt any 10 questions from this section., The first attempted 10 questions would be evaluated., , Case I. More than a million Americans die of cardiac diseases each year. One of the major causes is, high cholesterol levels in the blood. The National Cholesterol Education Program suggests, that total blood cholesterol level should be:, F–58 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Blood Cholesterol Level Chart, Desirable, , Borderline (high), , High Risk, , Total Cholesterol, , < 200, , 200-240, , > 240, , Triglycerides, , < 150, , 150-500, , > 500, , Low Density Cholesterol, , < 130, , 130-160, , >160, , High Density Cholesterol, , > 50, , 50-35, , < 35, , Given below are blood report of two persons, Total Cholesterol, , Triglycerides, , Patient A, , 356, , 180, , Patient B, , 180, , 100, , Q49. Which of the following organ can be affected in patient A?, , (a) Kidney, (b) Lungs, (c) Heart, (d) Brain, Q50. Which of the following vessels is not used in blood circulation?, , (a) Arteries, (b) Veins, (c) Capillaries, (d) Ureter, Q51. A person with high risk category have to be suggested a suitable diet? Which of the following, are correct guidelines for the patient, , (a) High sugar and starch , (b) Low salt and fats, , (c) High proteins , (d) Low sugar and proteins, Q52. Apart from following a prescribed diet, some other changes should be brought in the lifestyle, to avoid aggravation of symptoms in a patient who is already suffering from high blood, cholesterol , A. Yoga and exercise, , B. Quitting smoking and alcohol, , C. Walking and doing small chores on your own, , D. Enjoying loud music, , Which of the following is the correct option, , (a) A,C, (b) B,C,D, (c) A,B,C, (d) A, D, Case II. Five students conducted the experiment to show the reaction of Zinc metals with different, acids. The volume of acid was same but the type of acid given was different as shown in, the table below. The time was recorded to note the completion of reaction when no more, bubbles were formed., Experiment, , Acid, , Concentration, in mol/dm3, , Time/s, , A, , Sulphuric acid, , 1.0, , 20, , B, , Propanoic acid, , X, , 230, , C, , Nitric acid, , 1.0, , 40, , D, , Nitric acid, , X, , 80, Sample Paper – 5 n F–59

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q53. Which of the following reactions is fastest?, , (a) Experiment A, (b) Experiment B, (c) Experiment C, (d) Experiment D, Q54. Which of the following condition can increase the speed of given reactions if all the provided, conditions are kept constant?, , (a) Increased size of container, (b) Elevated pressure, , (c) Elevated temperature , (d) Lowered temperature, Q55. Name the experiment in which the reaction was slowest., , (a) Experiment A, (b) Experiment B, (c) Experiment D, (d) Experiment C, Q56. In experiment C and D the acid used is the same, why is the time taken different?, , (a) The amount of acid in D is more, (b) The volume of acid in D is less, , (c) The concentration of acid in D is more (d) The concentration of acid in D is less, Case III. Study these tables related to refractive index and answer the questions that follow:, Material medium, Air, , Refractive index, 1.0003, , Material medium, Crown glass, , Refractive index, 1.52, , Ice, , 1.31, , Canada Balsam, , 1.53, , Water, , 1.33, , Rock salt, , 1.54, , Alcohol, , 1.36, , Carbon disulphide, , 1.63, , Kerosene, , 1.44, , Dense flint glass, , 1.65, , Fused quartz, , 1.46, , Ruby, , 1.71, , Turpentine oil, , 1.47, , Sapphire, , 1.77, , Benzene, , 1.50, , Diamond, , 2.42, , Q57. Which of the following is correct?, , (a), , Speed of light in water, = 1.33, Speed of light in air, , (b), , Speed of light in air, = 1.33, Speed of light in water, , , (c) Speed of light in water = 1.33, , (d) None of these, Q58. Which of the following is optically denser than water?, (a) Kerosene, (b) Air, (c) Ice, (d) None of these, Q59. What happens to ray, when it enters a denser medium from rarer medium?, (a) Ray bends towards the normal, (b) Ray bends away from the normal, (c) Speed of light ray increases, (d) None of the above, Q60. What is the speed of blue light in crown glass?, (a) 3 × 108 ms–1, (b) 1.97 × 108 ms–1 (c) 4.56 × 108 ms–1, (d) 3.5 × 108ms–1, qqq, , F–60 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Time: 90 Minutes, , Sample Paper –, , 6, , Date __________, , Maximum Marks: 40, , General Instructions: Same as Sample Paper 1., , SECTION – A, Section — A consists of 24 questions. Attempt any 20 questions from this section., The first attempted 20 questions would be evaluated., Q1. Which of the following reaction is used in white washing of walls?, (a) 2Ca + O2 → 2CaO, (b) CaO + H2O → Ca(OH)2 + Δ, ∆, → CaO + H2O, (c) Ca(OH)2 + CO2 → CaCO3 + H2O (d) Ca(OH)2 , Q2. Observe the following figures and choose the correct option., , , , (a) pH of I is greater than II and IV., (b) pH of I is less than III and IV., , (c) pH of IV is less than I, II, III., (d) pH of IV is the highest., Q3. A student took Cu, Fe, Zn and Al strips separately in four test tubes labelled I, II, III and IV, respectively. He added 10 mL of freshly prepared ferrous sulphate solution to each test tube, as shown below:, , , Black residue would be obtained in test tubes:, , (a) I and II, (b) I and III, (c) II and III, (d) III and IV., Q4. Magnesium metal burns in air with dazzling white flame. The type of chemical reaction seen, is, , (a) combination reaction , (b) decomposition reaction, , (c) displacement reaction , (d) double decomposition, F–61

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q5. Four students were asked by their teacher to arrange the set-up I–IV as given below and identify, the gas evolved in each case, if any., , , After observation, they arrived at the following inferences and recorded these in the form of, a table given below:, Student, , I, , II, , III, , IV, , A, , H2, , No gas, , CO2, , H2, , B, , CO2, , H2, , No gas, , CO2, , C, , CO2, , H2, , H2, , No gas, , D, , No gas, , CO2, , CO2, , H2, , , The correct observation and inferences have been recorded by student, , (a) A , , (b) B, , (c) C , , (d) D, Q6. Which of the following are not ionic compounds?, (i) KCl, (ii) HCl, (iii) CCl4, (iv) NaCl, (a) (i) and (ii) , (b) (ii) and (iii), (c) (iii) and (iv) , (d) (i) and (iii), Q7. In the reaction, 3O2 (g) + 2H2S (g) → 2H2O(l) + 2SO2(g), the reducing agent is, (a) O2 , , (b) H2O, (c) H2S , , (d) SO2, Q8. The composition of aqua regia is, (a) conc. H2SO4 and conc. HCl in ratio of 1 : 3, (b) conc. HNO3 and conc. HCl in ratio of 1 : 3, (c) conc. HNO3 and conc. HCl in ratio of 3 : 1, (d) conc. H2SO4 and conc. HNO3 is ratio of 3 : 1, Q9. Which of the following statements is true for acids?, (a) Bitter and change red litmus to blue, (b) Sour and change red litmus to blue, (c) Sour and change blue litmus to red, (d) Bitter and change blue litmus to red, Q10. Identify ‘x’, ‘y’ and ‘z’ in the following balanced reaction, , xPb(NO3)2(s) Heat, , → yPbO(s) + zNO2(g) + O2(g), (a) 2, 4, 2, F–62 n, , (b) 2, 2, 4, Science – X, , (c) 2, 4, 4, , (d) 4, 2, 2

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q11. In the sketch of the stomatal apparatus shown in figure which one of the following is missing?, , (a) Inner thick wall of guard cell, (b) Open stomatal pore, (c) Nuclei in the guard cells, (d) Chloroplasts in the guard cells, Q12. The following experiment was set up to show that a gas is given out during respiration. But, there was no rise in the level of water in the tube. This was because, , (a) germinating seeds have not been kept under water in the flask., (b) water is kept in the beaker instead of lime water., (c) the cork on the flask is made of rubber., (d) no substance is kept in the flask to absorb the gas given out by the seeds., Q13. The diagram shows the human gut. Which numbered structures secrete digestive enzymes?, , (a) 1, 2, 3 and 4 , (c) 2, 3, 4 and 5 , , (b) 1, 2, 3, and 6, (d) 2, 3, 5 and 6, Sample Paper – 6 n F–63

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q14. The diagram represents a part of human circulatory system. Where is the blood pressure, highest?, , (a) A, (b) B, (c) C, (d) D, Q15. After digestion, proteins, carbohydrates and fats are respectively converted into, (a) Glucose, fatty acids and glycerols, (b) Amino acids, glucose and fatty acids, (c) Amino acids, glucose, fatty acids and glycerol, (d) Glucose, glycerol and fatty acids, Q16. Match the words of Column (A) with that of Column (B), Column A, , Column B, , (A) Phloem, , (i) Excretion, , (B) Nephron, , (ii) Translocation of food, , (C) Veins, , (iii) Clotting of blood, , (D) Platelets, , (iv) Deoxygenated blood, , (a) A-(ii), B-(i), C-(iv), D-(iii), (b) A-(iii), B-(i), C-(iv), D-(ii), (c) A-(iv), B-(iii), C-(ii), D-(i), (d) A-(ii), B-(iv), C-(i), D-(iii), Q17. A mirror that has very wide field view is, (a) concave, (b) convex, (c) plane, (d) none of these, Q18. Which of the following ray diagrams is correct for the ray of light incident on a lens?, , (a), , (b), F, , O, , F, , , (c), , O, , F, , F, , O, , F, , (d), F, , F–64 n, , F, , O, , F, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q19. Under which of the following conditions a concave mirror can form an image larger than the, actual object?, , (a) When the object is kept at a distance equal to its radius of curvature, , (b) When the object is kept at a distance less than its focal length, , (c) When the object is placed between the focus and centre of curvature, , (d) When the object is kept at a distance greater than its radius of curvature, Q20. An object is placed 20.0 cm in front of a concave mirror whose focal length is 25.0 cm. What, is the magnification of the object?, , (a) +5.0 , , (b) –5.0, , (c) +0.20 , , (d) –0.20, Q21. Refraction of light by the earth’s atmosphere due to variation in air density is called, , (a) atmospheric reflection , (b) atmospheric dispersion, , (c) atmospheric scattering , (d) atmospheric refraction, Q22. In an experiment, to find the focal length of a concave mirror, a graph is drawn between, v and u. The drawn graph looks like the, , (a), , (b), , , (c), , (d), , Q23. A student does the experiment on tracing the path of a ray of light through a rectangular glass, slab for different angles of incidence. He can get a correct measure of the angle of incidence, and the angle of emergence by which of the following figure., , (a), , (b), , Sample Paper – 6 n F–65

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , , (c), , Date __________, , (d), , Q24. In an experiment to trace the path of a ray of light passing through prism, the correct, measurement of angle of incidence (i) and angle of refraction (r) is shown in the diagram., , (a), , (b), , , (c), , (d), , SECTION – B, Section — B consists of 24 questions (S. No. 25 to 48). Attempt any 20 questions from this, section., The first attempted 20 questions would be evaluated., , Q25. Complete the missing variables given as ‘x’ and ‘y’ in the following reaction:, Pb(NO2)2(aq) + 2Kl(aq) → PbI2(x) + KNO3(y), , (a) aq and aq, , (b) s and s, , (c) aq and s, , (d) s and aq, , Q26. Four students were asked to test the pH of four samples as shown under. Whose result is, reported correctly?, , (a) Student 1, F–66 n, , Student, , Water, , Ethanoic acid, , HCl, , NaOH, , 1., , 7, , 1, , 1, , 1, , 2., , 7, , 3, , 1, , 1, , 3., , 7, , 1, , 1, , 13, , 4., , 7, , 3, , 1, , 13, , (b) Student 2, Science – X, , (c) Student 3, , (d) Student 4

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q27. Arrange the following metals in the order of their decreasing reactivity: Fe, Cu, Mg,, Ca, Zn, Ag, (a) Ca > Zn > Mg > Cu > Ag > Fe, (b) Ca > Zn > Cu > Mg > Ag > Fe, (c) Ca > Mg > Zn > Fe > Cu > Ag, (d) Ca > Mg > Fe > Zn > Cu > Ag, Q28. Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with, steam?, , (a) FeO, (b) Fe2O3, (c) Fe3O4, (d) Fe2O3 and Fe3O4, Q29. Common salt besides being used in kitchen can also be used as the raw material for making, (i) washing soda , (ii) bleaching powder, (iii) baking soda , (iv) slaked lime, (a) (i) and (ii) , (b) (i), (ii) and (iv), (c) (i) and (iii) , (d) (i), (iii) and (iv), Q30. Identify the compound X on the basis of the reactions given below., , , (a) H2CO3, (b) HNO3, (c) H2SO4, (d) NaOH, Question No. 31 to 34 consist of two statements – Assertion (A) and Reason (R). Answer, these questions selecting the appropriate option given below:, (a) Both A and R are true and R is the correct explanation of A, (b) Both A and R are true and R is not the correct explanation of A, (c) A is true but R is false, (d) A is false but R is true, Q31. Assertion: Corrosion of iron is commonly known as rusting., , Reason: Corrosion of iron occurs in presence of water and air., Q32. Assertion: Baking soda creates acidity in the stomach., Reason: Baking soda is alkaline., Q33. Assertion: Raw materials needed for photosynthesis are carbon dioxide, water and minerals., Reason: Nutrients provide energy to an organism., Q34. Assertion: Sun appears reddish in the morning. It will not be observed on moon., , Reason: It is because moon does not have atmosphere, therefore, light will not scatter., Q35. In an experiment to study the properties of ethanoic acid, a student takes about 3 mL of ethanoic, acid in a dry test tube. He adds an equal amount of distilled water to it and shakes the test tube, well. After some time he is likely to observe that:, (a) a colloid is formed in the test tube., , (b) the ethanoic acid dissolves readily in water., , (c) the solution becomes light orange., , (d) water floats over the surface of ethanoic acid., Sample Paper – 6 n F–67

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q36. Choose the correct path of urine in our body, , (a) kidney → ureter → urethra → urinary bladder, (b) kidney → urinary bladder → urethra → ureter, (c) kidney → ureters → urinary bladder → urethra, (d) urinary bladder → kidney → ureter → urethra, Q37. Choose the function of the pancreatic juice from the following, , (a) trypsin digests proteins and lipase carbohydrates, , (b) trypsin digests emulsified fats and lipase proteins, , (c) trypsin and lipase digest fats, , (d) trypsin digests proteins and lipase emulsified fats, Q38. In which of the following vertebrate group/groups, heart does not pump oxygenated blood to, different parts of the body?, , (a) Pisces and amphibians , (b) Amphibians and reptiles, , (c) Amphibians only , (d) Pisces only, Q39. Rays from Sun converge at a point 15 cm in front of a concave mirror. Where should an object, be placed so that size of its image is equal to the size of the object?, , (a) 15 cm in front of the mirror, , (b) 30 cm in front of the mirror, , (c) between 15 cm and 30 cm in front of the mirror, , (d) more than 30 cm in front of the mirror, Q40. If a ray of light makes an angle of 30° with the refracting surface, then what will be the angle, of incidence?, , (a) 30°, (b) 60°, (c) 90°, (d) 45°, Q41. Large intestine in man mainly carries out, , (a) absorption , (b) assimilation, , (c) digestion of fats , (d) digestion of carbohydrates, Q42. Which of the following contributes most to the transport of water from the ground to the leaves, of a tall tree?, , (a) Root pressure , (b) Capillary rise of water in xylem, , (c) Breakdown of ATP , (d) Cohesion of water and transpiration pull, Q43. If a man’s face is 25 cm in front of concave shaving mirror producing erect image 1.5 times, the size of face, focal length of the mirror would be, , (a) 75 cm, (b) 25 cm, (c) 15 cm, (d) 60 cm, Q44. The refractive index of transparent medium is greater than one because, , (a) Speed of light in vacuum < speed of light in tansparent medium, (b) Speed of light in vacuum > speed of light in tansparent medium, (c) Speed flight in vacuum = speed of light in tansparent medium, (d) Frequency of light wave changes when it moves from rarer to denser medium, F–68 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q45. When object moves closer to convex lens, the image formed by it shift, , (a) away from the lens , (b) towards the lens, , (c) first away and then towards the lens, (d) first towards and then away from the lens, Q46. The path of a ray of light passing through a rectangular glass slab was traced and angles, measured. Which one out of the following is the correct representation of an angle of incidence, (i), angle of refraction (r) and angle of emergence (e) as shown in the diagrams., , (a), , (b), , , (c), , (d), , Q47. Parallel rays from a distant tree, incident on a convex lens forms an image on the screen., Which of the following images depicts the correct image formation on the screen?, , (a), , (b), , , (c), , (d), , Q48. Identify X, Y and Z from the given table., Salts, , Original colour, , Colour of aqueous solution, , ZnSO4, , white salt, , X, , FeSO4, , Y, , green solution, , CuSO4, , blue salt, , blue solution, , Al2(SO4)3, , white salt, , Z, Sample Paper – 6 n F–69

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , , (a) X–colourless, Y–light green, Z–white, , (b) X–white, Y–light green, Z–white, , (c) X–white, Y–red, Z–colourless, , (d) X–colourless, Y–light green, Z–colourless, , SECTION – C, Section – C consists of three Cases followed by questions. There are a total of 12 questions, in this section. Attempt any 10 questions from this section., The first attempted 10 questions would be evaluated., , Case I. To demonstrate the transpiration from the leaf surface, Saily took four banyan leaves . Both, the surfaces of the A leaf, lower surface (with stomata) of B leaf, upper surface (without, stomata) of C leaf are vaselined. The Vaseline is not applied on the D leaf. Now, as shown, in the figure the leaves are hanged so that they may transpire freely., , Leaf number, , Mass at start/g, , Mass at end/g, , A, , 1.0, , 1.0, , B, , 1.2, , 1.1, , C, , 1.3, , 0.8, , D, , 1.2, , 0.9, , Q49. Which of the following is the role of vaseline in the experiment?, , (a) Prevention of water loss, , (b) Increase water loss, , , (c) Moisturise the leaves , , (d) Helps in drying the leaves, , F–70 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Q50. Which surface of leaf allowed more loss of water?, , (a) Tip of the leaf , , (b) Upper surface of leaf, , , (c) Lower surface of leaf , , (d) None of these, , Q51. Percentage loss of mass in leaf C is, , (a) 38.5 , , , , (b) 37.5, , , (c) 36.5 , , , , (d) 39.5, , Q52. The maximum loss of mass take place in leaf, , (a) A , , , , (b) B, , , (c) C , , , , (d) D, , Case II. Analyse the following observation table showing variation of image distance (v) with object, distance (u) in case of a convex lens and answer the questions that follow, without doing, any calculations:, S. No., , Object distance u (cm), , Image distance v (cm), , 1, , – 90, , + 18, , 2, , – 60, , + 20, , 3, , – 30, , + 30, , 4, , – 20, , + 60, , 5, , – 18, , + 90, , 6, , – 10, , + 100, , Q53. What is the focal length of the given convex lens?, , (a) +15 cm , , , , (b) –15 cm, , , (c) +30 cm , , , , (d) –10 cm, , Q54. The serial number of that observation which is not correct is, , (a) S.No. 3 , , , , (b) S.No. 5, , , (c) S.No. 6 , , , , (d) S.No. 2, , Q55. The approximate value of magnification in case of S.No. 4 is, , (a) –2 , , , , (b) –3, , , (c) +3 , , , , (d) +2, , Q56. The image formed in case of S.No. 2 is, , (a) virtual and enlarged , , (b) virtual and diminished, , , (c) real and diminished , , (d) real and enlarged, Sample Paper – 6 n F–71

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , Volume of hydrogen, , Case III.The following graph shows the volume of hydrogen collected in two different experiments, when dil hydrochloric acid was reacted with zinc, magnesium, iron and copper metal., , 0, , 1, 2 3, 4, , Time, , Q57. Which of the following graph will produce hydrogen gas fastest., , (a) 1, , (b) 2, , (c) 3, , (d) 4, , Q58. Name the metal used in experiment that gave the result for graph-2., (a) Zinc, , (b) Magnesium, , (c) Iron, , (d) Copper, , Q59. Way to speed up the slow reaction are, (i) heating the reactions , , (ii) cooling the reactants, , (iii) using more diluted acid, , (iv) using more concentrated acid, , (a) (i) and (iii) , , (b) (ii) and (iii), , (c) (ii) and (iv) , , (d) (i) and (iv), , Q60. The amount of zinc metal used for the above reaction is same but the concentration of acid is, changed, what would be the effect on the rate of reaction?, , (a) no change , , (b) the speed will increase, , , (c) the speed will decrease, , (d) the information is incomplete, qqq, , F–72 n, , Science – X

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , Date __________, , ANSWERS OF SAMPLE PAPERS (2–6), Sample Paper-2, 1., 6., 11., 16., 21., 26., 31., 36., 41., 46., 51., 56., , (a), (c), (b), (c), (c), (d), (a), (a), (d), (c), (d), (d), , 2., 7., 12., 17., 22., 27., 32., 37., 42., 47., 52., 57., , (d), (d), (a), (d), (c), (b), (a), (b), (c), (d), (b), (a), , 3., 8., 13., 18., 23., 28., 33., 38., 43., 48., 53., 58., , (d), (b), (d), (d), (a), (d), (c), (c), (c), (d), (c), (c), , 4., 9., 14., 19., 24., 29., 34., 39., 44., 49., 54., 59., , (c), (b), (d), (b), (b), (c), (a), (a), (c), (c), (d), (b), , 5., 10., 15., 20., 25., 30., 35., 40., 45., 50., 55., 60., , (c), (a), (d), (d), (d), (b), (a), (b), (a), (a), (a), (d), , 2., 7., 12., 17., 22., 27., 32., 37., 42., 47., 52., 57., , (d), (a), (d), (c), (c), (a), (a), (a), (a), (b), (d), (b), , 3., 8., 13., 18., 23., 28., 33., 38., 43., 48., 53., 58., , (d), (b), (c), (a), (c), (b), (b), (a), (a), (d), (c), (d), , 4., 9., 14., 19., 24., 29., 34., 39., 44., 49., 54., 59., , (d), (a), (b), (c), (b), (d), (d), (c), (a), (b), (d), (b), , 5., 10., 15., 20., 25., 30., 35., 40., 45., 50., 55., 60., , (c), (d), (c), (d), (d), (d), (a), (c), (d), (c), (b), (c), , 2., 7., 12., 17., 22., 27., 32., 37., , (a), (d), (d), (a), (d), (b), (c), (b), , 3., 8., 13., 18., 23., 28., 33., 38., , (a), (b), (c), (a), (b), (b), (c), (c), , 4., 9., 14., 19., 24., 29., 34., 39., , (b), (c), (c), (a), (a), (c), (d), (c), , 5., 10., 15., 20., 25., 30., 35., 40., , (c), (b), (b), (b), (b), (b), (b), (c), , Sample Paper-3, 1., 6., 11., 16., 21., 26., 31., 36., 41., 46., 51., 56., , (d), (d), (a), (c), (a), (d), (a), (a), (d), (d), (c), (a), , Sample Paper-4, 1., 6., 11., 16., 21., 26., 31., 36., , (d), (d), (d), (b), (b), (d), (a), (d), , Answers of Sample Papers (2–6) n F–73

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E:\Super_20_All-In-One-10_(27-09-2021)\Open_Files\6_Super 20_Science-10\Super 20_Science-10_(1-6_Papers), \ 27-Sep-2021, Amit, Proof-4, Reader’s Sign _______________________, , 41., 46., 51., 56., , (c), (a), (c), (d), , Date __________, , 42., 47., 52., 57., , (c), (a), (d), (a), , 43., 48., 53., 58., , (a), (d), (b), (a), , 44., 49., 54., 59., , (a), (d), (b), (c), , 45., 50., 55., 60., , (b), (a), (c), (b), , 2., 7., 12., 17., 22., 27., 32., 37., 42., 47., 52., 57., , (b), (c), (a), (b), (c), (d), (c), (b), (d), (c), (c), (b), , 3., 8., 13., 18., 23., 28., 33., 38., 43., 48., 53., 58., , (d), (b), (a), (d), (a), (b), (b), (a), (b), (d), (a), (a), , 4., 9., 14., 19., 24., 29., 34., 39., 44., 49., 54., 59., , (c), (b), (c), (a), (b), (b), (a), (a), (c), (c), (c), (a), , 5., 10., 15., 20., 25., 30., 35., 40., 45., 50., 55., 60., , (a), (d), (a), (b), (b), (c), (c), (d), (b), (d), (b), (b), , 2., 7., 12., 17., 22., 27., 32., 37., 42., 47., 52., 57., , (d), (c), (d), (b), (c), (c), (d), (d), (d), (a), (c), (a), , 3., 8., 13., 18., 23., 28., 33., 38., 43., 48., 53., 58., , (d), (b), (b), (a), (c), (c), (b), (d), (a), (d), (a), (a), , 4., 9., 14., 19., 24., 29., 34., 39., 44., 49., 54., 59., , (a), (c), (b), (c), (d), (a), (a), (b), (b), (a), (c), (d), , 5., 10., 15., 20., 25., 30., 35., 40., 45., 50., 55., 60., , (c), (b), (c), (a), (d), (d), (b), (b), (a), (c), (b), (d), , Sample Paper-5, 1., 6., 11., 16., 21., 26., 31., 36., 41., 46., 51., 56., , (c), (d), (d), (d), (c), (b), (a), (c), (d), (d), (b), (d), , Sample Paper-6, 1., 6., 11., 16., 21., 26., 31., 36., 41., 46., 51., 56., , F–74 n, , (c), (b), (c), (a), (d), (d), (b), (c), (a), (d), (a), (c), , Science – X