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KENDRIYA VIDYALAYA GACHIBOWLI, GPRA CAMPUS, HYD–32, SAMPLE PAPER TEST 03 FOR TERM-I (2021), (ANSWERS), SUBJECT: SCIENCE, CLASS : X, 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., , MAX. MARKS: 40, DURATION: 1½ Hrs, , SECTION – A, Section – A consists of 24 questions. Attempt any 20 questions from this section., The first attempted 20 questions would be evaluated., 1. An element reacts with oxygen to give a compound with a high melting point. The compound is, soluble in water. The element is likely to be, (a) Calcium (b) Carbon (c) Iron (d) Silicon, Ans. (a), Calcium reacts with oxygen to form calcium oxide, with a high melting point, and is soluble in, water., 2. What are the raw materials needed to make washing soda?, (a) Ammonia and lime stone, (b) Sodium hydroxide, calcium chloride and ammonia, (c) Sodium chloride, ammonia and lime stone, (d) Calcium chloride and sodium chlorine, Ans. (c), 3. In the following reaction, which option in the given table correctly represents the substance oxidised, and the substance reduced?, ZnO + C → Zn + CO, Option Substance oxidised, Substance reduced, (a), CO, Zn, (b), ZnO, CO, (c), C, ZnO, (d), ZnO, C, Ans. (c), 4. What are the products formed when quick lime is added to water?, (a) CO2 and heat (b) Na2CO3 and heat (c) Ca(OH)2 and heat (d) CaSO4 and heat, Ans. (c), 5. Which of the following is an endothermic reaction?, (a) Zinc and hydrochloric acid to form zinc chloride and hydrogen, (b) Carbon and oxygen to form carbon monoxide, (c) Glucose and oxygen to form carbon dioxide and water, (d) Nitrogen and oxygen to form nitric oxide, Ans. (d), Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 1-
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6. 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) & (iv) (b) (ii) & (iii) (c) (i) & (ii) (d) (iii) & (iv), Ans. (d), 7. The reaction between calcium oxide with water is an example of, (a) Displacement reaction (b) Combination reaction (c) Decomosition reaction (d) Double, displacement reaction, Ans. (b), 8. Which of the following statements is not true for the tooth enamel?, (a) It is made up of calcium phosphate, (b) It does not dissolve in water, (c) It is corroded when pH is below 5.5, (d) It is corroded when pH is below 10.0., Ans. (c), 9. Which among the given 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., Ans. (b), 10. The colour of the coating developed on a zinc rod on dipping in aqueous copper sulphate solution, will be, (a) blue (b) brown (c) white (d) green, Ans. (b), 11. What is the minimum distance between the object and real image in case of a concave mirror?, (a) f (b) 1/2f (c) 2f (d) 0, Ans. (d), 12. Two lenses are kept in contact one having focal length +40 cm and the other of focal length -20 cm., Their combine focal length is, (a) +20 cm (b) +40 cm (c) -40 cm (d) -20 cm, Ans. (c), 13. A student was asked to obtain real image of a tree on the screen with the help of a suitable mirror., He can do so by taking a, (a) concave mirror (b) plane mirror (c) convex mirror (d) either (a) or (c), Ans. (a), 14. A student places a convex lens in front of sun rays entering a room from window. The rays would, meet at, (a) focus of lens (b) centre of curvature of lens (c) pole of lens (d) optical centre of lens, Ans. (a), , Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 2-
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15. Water is transported through xylem vessels. plant takes place through, (a) Sieve tubes only (b) Sieve tubes along with companion cells, (c) Both xylem and phloem (d) Sieve tubes and phloem fibres, Ans. (b), 16. Which of the following ray diagram is correct for the reflected ray of light when ray of light incident, on a concave mirror as shown in figure?, , (a) Figure 1 (b) Figure 2 (c) Figure 3 (d) Figure 4, Ans. (d), 17. The speed of light is maximum in, (a) diamond (b) glass (c) water (d) vacuum, Ans. (d), 18. What is shown in the diagram below?, , (a) An object is placed behind the centre of curvature of a convex lens, the real image is formed at, the centre of curvature., (b) An object is placed behind the centre of curvature of a convex lens, the real image is formed, between the centre of curvature and focus., (c) An object is placed at infinity, from a convex lens, the real image is formed at the focus., (d) An object is placed between the centre of curvature and focus of a convex lens, the real image, is formed behind the centre of curvature., Ans. (b), Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 3-
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19. Observe the diagram. Choose the correct option that gives correct identification., , (a) i-Larynx, ii-Trachea, iii-Bronchi, iv-Bronchiole, (b) i-Larynx, ii-Bronchi, iii-Trachea, iv-Bronchiole, (c) i-Trachea, ii-Larynx, iii-Bronchi, iv-Bronchiole, (d) i-Trachea, ii-Larynx, iii-Bronchiole, iv-Bronchi, Ans. (c), 20. Which of the following is a false statement regarding villi of intestine?, (a) They increase the surface area., (b) They are supplied with capillaries and vessels., (c) They have microvilli., (d) They participate in digestion of proteins., Ans. (d), 21. In the following sketch of the stomatal apparatus, the parts I, II, Ill and IV are labelled differently, by four students. The correct labelling, out of the following, is, , (a) I. guard cell, II. stoma, III. chloroplast, IV. nucleus, (b) I. cytoplasm, II. nucleus, III. stoma, IV. chloroplast, (c) I. guard cell, II. nucleus, III. starch granule, IV. stoma, (d) I. cytoplasm, II. chloroplast, III. stoma, IV. nucleus, Ans. (a), 22. Which substances are produced by anaerobic respiration in yeast?, Option Carbon Dioxide Alcohol, Lactic acid, Water, (a), Yes, Yes, No, No, (b), Yes, No, Yes, No, (c), No, Yes, No, Yes, (d), No, No, Yes, Yes, Ans. (a), , Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 4-
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23. After observing various slides showing different stages of binary fission in Amoeba, a student draws, the following diagrams. However, these diagrams may not be in proper sequence. Identify the, correct sequence of the below stages., , (a) III, II, I, V, IV, (b) III, V, II, I, IV, (c) III, I, II, V, IV, (d) III, II, V, I, IV, Ans. (d), 24. Ria placed a water bottle at a distance of 20 cm in front of a convex mirror which has a focal length, of 20 cm. The image will be formed at, (a) At a distance of 10 cm behind the mirror, (b) At a distance of 10 cm in front of the mirror, (c) At a focus in front of the mirror, (d) At focus behind the mirror, Ans. (a), , SECTION – B, Section – B consists of 24 questions. Attempt any 20 questions from this section., The first attempted 20 questions would be evaluated., 25. Which of the following reactions is a displacement reaction?, (a) MgC12 solution with aluminium metal, (b) NaCl solution with copper metal, (c) FeSO4 solution with silver metal, (d) AgNO3 solution with copper metal, Ans. (d), 26. Bleaching powder is produced by, (a) Action of chlorine on ammonia, (b) Action of chlorine on dry slaked lime, (c) Action of chlorine on sodium carbonate, (d) Action of chlorine on sodium chloride, Ans. (b), 27. Select the incorrect option., Indicator, (a) Litmus (Purple), (b) Flower of Hydrangea plant (Blue), (c) Red cabbage juice (Purple), (d) Turmeric juice (yellow), Ans. (b), , Colour in acidic medium, Red, Red, Red or Pink, Yellow, , Colour in basic medium, Blue, Green, Green, Reddish brown, , 28. Bee sting leaves an acid which causes pain and irritation. The acid is, (a) Tartaric acid (b) Oxalic acid (c) Methanoic acid (d) Ethanoic acid, Ans. (c), Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 5-
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29. Which of the following elements is least reactive?, (a) Zn (b) Ag (c) Fe (d) Cu, Ans. (b), 30. Observe the experiment. Identify the product formed in the above experiment., , (a) Calcium carbonate (b) Calcium phosphate, (c) Calcium oxide (d) Calcium hydroxide, Ans. (d), 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 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., 31. Assertion: Ventricles have thicker walls than auricles., Reason: Ventricles have to pump blood into various organs with great pressure., Ans. (a), 32. Assertion: Higher the refractive index of the prism material, lower is the angle of deviation., Reason: The angle of deviation is directly proportional to the angle of prism., Ans. (d), 33. Assertion: MnO2 + 4 HCl → MnCl2 + Cl2 + 2H2O, is redox reaction, Reason: MnO2 oxidises HCl to Cl2 and gets reduced to MnC12, Ans. (a), 34. Assertion: Magnesium reacts with oxygen upon heating and bums brightly to form magnesium, oxide., Reason: Magnesium oxide is basic in nature., Ans. (b), 35. Respiration and combustion are similar processes as, (a) Enzymes are required in both processes, (b) Both occur in both living and non-living objects., (c) Energy is released in both processes, (d) Both require high temperature for activation, Ans. (d), 36. In stomatal transpiration, the water moves across the cells of leaf, (a) by osmosis along the water potential gradient., (b) by osmosis against the water potential gradient., (c) by diffusion of water molecules using metabolic energy, (d) by osmosis using metabolic energy, Ans. (a), Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 6-
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37. When the object is placed between focus (F) and centre of curvature (2F) of a convex lens, the, image formed is, (a) at F (b) 2F (c) beyond 2F (d) between optical centre (O) and F, Ans. (c), 38. A given prism deviates the red light, (a) least (b) most (c) moderately (d) any of these, Ans. (a), 39. Four solutions are taken as P, Q, R and S. The pH of those solutions are given in the following, table., Solutions, pH, P, 6, Q, 9, R, 12, S, 7, The most acidic and basic solutions are, (a) P and S respectively (c) P and R respectively, (b) P and Q respectively (d) Q and R respectively, Ans. (c), 40. Which of the following is the correct feature of lymph?, (a) It is similar to the plasma of blood, but is colourless and contains less proteins, (b) It is similar to the WBCs of blood, but is colourless and contain more proteins., (c) It is similar to the RBCs of blood and red in colour, (d) It contains more fats., Ans. (a), 41. The blue colour of the sky is due to, (a) refraction of light through the atmosphere, (b) dispersion of light of the atmosphere, (c) scattering of light by air molecules, (d) All of these, Ans. (c), 42. A student used a device (X) to obtain/focus the image of a well illuminated distant building on a, screen (S) as shown below in the diagram. Select the correct statement about the device (X)., (a) The device is a concave lens of focal length 8 cm., (b) This device is a convex mirror of focal length 8 cm., (c) This device is a convex lens of focal length 4 cm., (d) This device is a convex lens of focal length 8 cm., , Ans. (d), Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 7-
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43. Which of the following is incorrect about ionic compounds?, (a) They have high melting and boiling points, (b) They are generally solids., (c) They exist in form of crystals., (d) They share electrons in formation of ionic bonds., Ans. (d), 44. Which of the following has no effect on photosynthesis?, (a) Carbon dioxide concentration (b) Humidity (c) Temperature (d) Light intensity, Ans. (b), 45. Soma kept a plant in the dark for two days. She uses a leaf to investigate the effect of two factors, on photosynthesis as shown in the diagram:, What arc the colours of Q and R, when the leaf is tested for starch, using the iodine solution?, , Option, (a), (b), (c), (d), , Q, Blue/black, Brown, Blue/black, Brown, , R, Brown, Brown, Blue/black, Blue/black, , Ans. (b), 46. In a concave minor, if the magnification of an image is + 4, the characteristics of image will be, (a) Virtual and erect (b) Real and inverted (c) Virtual and inverted (d) Real and diminished, Ans. (a), 47. Refractive index of X with respect to Y is 1.5. What will be the refractive index of Y with respect, to X?, (a) 1.5 (b) 0.66 (c) 0.25 (d) 1.0, Ans. (b), 48. A student was asked to draw a diagram for formation of real image by a convex lens for the, following position of object :, (i) between F and 2 F, (ii) at 'F', (iii) at '2 F', (iv) between focus and optical centre, The position for which real image cannot be formed is, (a) (i) (b) (ii) (c) (iii) (d) (iv), Ans. (d), , Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 8-
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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 Study-1:, Observe the diagram carefully and answer the questions that follow., , 49. In the above reaction,, (a) Both copper and iron have less reactivity., (b) Both copper and iron have same reactivity., (c) Iron is more reactive than copper., (d) Copper is more reactive than iron., Ans. (c), 50. Iron displaces copper ions from the aqueous solutions of copper sulphate as it is a, (a) combination reaction (b) displacement reaction, (c) double displacement reaction (d) decomposition reaction, Ans. (b), 51. What happens when copper rod is dipped in iron sulphate solution?, (a) Copper displaces iron, (b) Blue colour of copper sulphate solution is obtained, (c) No reaction takes place, (d) Reaction is exothermic, Ans. (c), 52. After the reaction the colour of the coat of copper metal on iron will be, (a) whitish blue (b) light purple (c) greenish yellow (d) reddish brown, Ans. (d), Case Study-3:, Refraction of light by atmosphere is called atmospheric refraction. When a source of light transmits, light rays in the atmosphere, these light rays pass through the atmosphere having different air layers of, different densities and get refracted by the atmosphere. Since the physical condition of the medium are, not stationary, the apparent position of the object as seen through the hot air fluctuates., , Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 9-
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53. What happens when white light is passed from air to glass prism?, (a) Bends away from normal, (b) Bends towards normal, (c) Passes undeviated, (d) Reflects back, Ans. (b), , 54. Which of the following occurs due to atmospheric refraction?, (a) Rainbow formation and advanced sunrise, (b) Delayed sunset and twinkling of stars, (c) Blue colour sky and twinkling of stars, (d) Twinkling of stars and red colour of sun during sunrise, Ans. (b), 55. Why do stars appear to twinkle at night?, (a) because the light of stars travels in different optical densities in the atmosphere, (b) because the distance of star varies when earth rotates, (c) because the star changes its position relative to earth, (d) because the atmosphere reflects the light at different angles, Ans. (a), 56. The planet Venus, which is seen in the evening sky, does not twinkle because :, (a) it is closer to the earth, (b) it is seen as extended source, (c) the total variation in the amount of light entering our eye from all individual sources will be, average out to zero, (d) all these, Ans. (d), Case Study-2:, Inside our kidney, there are a number of nephrons. Nephrons are the structural and functional units of, kidney. Each nephron has two main regions, Bowman's capsule and a tubule. One end of the tubule is, connected to Bowman's capsule and other end is connected to urine collecting duct of the kidney., Bowman's capsule contains a number of blood capillaries, called glomerulus. The U-shaped middle, part of the nephron is called Loop of Henle., , Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 10-
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57. Which of the following substances cannot pass through the glomerulus capillaries?, (a) glucose (b) water (c) protein (d) salts, Ans. (c), 58. Loop of Henle plays the role of :, (a) secretion (b) reabsorption (c) ultrafiltration (d) excretion, Ans. (b), 59. Which of the following is a false statement about Bowman's capsule?, (a) It is a cup-shaped structure, (b) A bundle of blood capillaries called glomerulus is found in Bowman's capsule, (c) Selective reabsorption occurs in Bowman's capsule, (d) Bowman's capsule is found in the beginning of the tubule, Ans. (c), 60. Ultrafiltration is the major step of urine formation. This step takes place inside, (a) glomerulus (b) loop of Henle (c) renal artery (d) collecting tubule, Ans. (a), , Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 11-
