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KENDRIYA VIDYALAYA GACHIBOWLI, GPRA CAMPUS, HYD–32, SAMPLE PAPER TEST 05 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. Which of the following observation is correct for above reactions shown in figure?, , (a) a brown coloured gas liberated in test tube A., (b) a brown coloured gas liberated in test tube B., (c) a colourless gas liberated in test tube A., (d) a colourless gas liberated in test tube B., Ans. (c), 2. The elements preserved in kerosene and water respectively are, (a) Ca, Na (b) A1, P (c) Na, P (d) Hg, Br, Ans. (c), 3. Which of the following is an exothermic reation?, (a) Decomposition of AgCl in light, (b) Dissolution of amononium chloride, (c) Diisolution of H2SO4 in water, (d) Electrolysis of water, Ans. (c), 4. Plaster of paris is made from –, (a) lime stone (b) slaked lime (c) quick lime (d) gypsum, Ans. (d), Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 1-
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5. Al2O3 reacts with, (a) only water (b) only acids (c) only alkalis (d) both acids and alkalis, Ans. (d), 6. Observe the following figures and choose the correct option., , (a) pH of I is greater than II and IV., (c) pH of IV is less than I, II, III., Ans. (d), , (b) pH of I is less than III and IV., (d) pH of IV is the highest., , 7. Identify the correct option those are secreted in location i, ii, iii and iv., , (a) i-ptyalin, ii-amylase, iii-trypsin, iv-pepsin, (b) i-sucrase, ii-pepsin, iii-trypsin, iv-amylase, (c) i-ptyalin, ii-pepsin, iii-trypsin, iv-sucrase, (d) i-pepsin ,ii-amylase, iii-trypsin, iv-lipase, Ans. (c), 8. In the following sketch of stomatal apparatus, parts I, II, III and IV were labelled differently by four, students. The correct labelling is:, , (a) I-guard cell, II-stroma, III-starch granule, IV-nucleus, (b) I-cytoplasm II-nucleus, III-stroma, IV-chloroplast, (c) I-guard cell, II-starch, III-nucleus, IV-stroma, (d) I-cytoplasm, II-chloroplast, III-stroma, IV-nucleus, Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 2-
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Ans. (b), 9. Which of the following flower petals can be used as an indicator, (1) Petunia (2) Hydrangea (3) Geranium (4) Cabbage (5) Hibiscus, (a) 1,2,4 (b) 2,3,5 (c) 1,2,4,5 (d) 1,2,3,4, Ans. (d), 10. Which of the following is a redox reaction(s)?, (a) BaCl2 + H2SO4 → BaSO4 + 2HCl (b) H2SO4 + 2NaOH → 2Na2SO4 + 2H2O, (c) CH3COOH + C2H5OH → CH3COOC2H5 + H2O (d) 2FeCl3 + SnCl2 → 2FeCl2 + SnCl4, Ans. (d), 11. Which salt can be classified as an acid salt?, (a) Na2SO4 (b) CH3COONa (c) Pb(OH)Cl (d) Na2HPO4, Ans. (d), 12. Magnesium ribbon is rubbed with sand paper before making it to burn. The reason of rubbing the, ribbon is to:, (a) remove moisture condensed over the surface of ribbon., (b) generate heat due to exothermic reaction., (c) remove magnesium oxide formed over the surface of magnesium., (d) mix silicon from sand paper (silicon dioxide) with magnesium for lowering ignition temperature, of the ribbon., Ans. (c), 13. The label X represents ___________ that function in _________., (a) vasa recta -Reabsorption of water, minerals & digestive end products., (b) Henle’s loop - Filtration of plasma leaving the blood., (c) vasa recta - Filtration of plasma leaving the blood., (d) Henle’s loop - Reabsorption of water minerals and digestive end products., , Ans. (d), 14. Single circulation, i.e., blood flows through the heart only once during one cycle of passage through, the body, is exhibited by which of the following:, (a) hyla, rana, draco (b) whale, dolphin, turtle, (c) labeo, chameleon, salamander (d) hippocampus, exocoetus, anabas, Ans. (d), , Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 3-
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15. During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid, in the, (a) cytoplasm (b) chloroplast (c) mitochondria (d) golgi body, Ans. (a), 16. Dispersion of light is defined as, (a) spliting of white light into seven colours (b) spliting of white light into five colours, (c) spliting of white light into six colours (d) spliting of white light into any number of colours, Ans. (a), 17. The distance between a spherical lens and the image is – 15 cm. The lens is, (a) concave lens (b) convex lens, (c) either of the two irrespective of the object distance (d) either concave lens or convex lens with, object between O and F., Ans. (d), 18. You are given water, mustard oil, glycerine and kerosene. In which of these media a ray of light, incident obliquely at same angle would bend the most?, (a) Kerosene (b) Water (c) Mustard oil (d) Glycerine, Ans. (d), 19. A real and enlarged image can be formed by using a, (a) convex mirror (b) plane mirror, (c) concave mirror (d) either convex or a plane mirror, Ans. (c), 20. In the given figure, label A represents __________ while label B represents _________., (a) A - Trachea, B - Bronchus (b) A - Alveolus, B - Bronchiole, (c) A - Bronchiole, B - Trachea (d) A - Trachea, B – Bronchiole, , Ans. (a), 21. For reflection through spherical surfaces, the normal at the point of incidence is, (a) perpendicular to the principle axis and passes through the centre of curvature, (b) perpendicular to the focal plane and passes through the pole., (c) perpendicular to the tangent plane at pole and passes through the focus., (d) perpendicular to the tangent plane at the point of incidence and passes through the centre of, curvature., Ans. (d), 22. Under which of the following conditions a concave mirror can form an image larger than the actual, object?, Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 4-
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(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, Ans. (c), 23. A ray of light propagates from an optically denser medium to an optically rarer medium., (a) It will bend towards the normal after refraction., (b) It will bend away from the normal after refraction., (c) It will continue to go on the same path after refraction., (d) It will refract making an angle of refraction = angle of incidence., Ans. (b), 24. An inverted image can be seen in a convex mirror,, (a) under no circumstances, (b) when the object is very far from the mirror, (c) when the object is at a distance equal to the radius of curvature of the mirror, (d) when the distance of the object from the mirror is equal to the focal length of 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. Take about 1.0g CaCO3 in a test tube. Heat it over a flame, a colourless gas comes out. The reaction, is called a, (a) decomposition reaction (b) displacement reaction, (c) double decomposition reaction (d) double displacement reaction, Ans. (a), 26. Which of the following is not a mineral acid?, (a) Hydrochloric acid (b) Citric acid (c) Sulphuric acid (d) Nitric acid, Ans. (b), 27. Which of the following will give displacement reactions?, , (a) A (b) B (c) C (d) D, Ans. (a) and (d) (marks for both option), 28. When copper powder is heated it gets coated with –, (a) black copper oxide (b) yellow copper oxide (c) red copper oxide (d) None of these, Ans. (a), 29. Common salt can also be used as the raw material for making, Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 5-
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(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), Ans. (c), 30. The metal that reacts with hot water is –, (a) mercury (b) magnesium (c) zinc (d) copper, Ans. (b), 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: During anaerobic respiration glucose is partially oxidised., Reason: Anaerobic respiration proceeds in the absence of oxygen., Ans. (c), 32. Assertion: Mostly Metals do not read with HNO3., Reason: HNO3 oxidises H2 product to water and itself gets reduced to any of the nitrogen oxides., Ans. (a), 33. Assertion : All alkalis are bases but all bases are not alkali., Reason : Water soluble bases are alkali., Ans. (a), 34. Assertion : Nitrate ores are rarely available., Reason : Bond dissociation energy of nitrogen is very high., Ans. (a), 35. 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 (d) Dispersion, scattering and total internal, reflection, Ans. (c), 36. Which of the following is the correct order for the flow of food from mouth to anus?, (a) Oesophagus → Stomach → Small Intestine → Large Intestine, (b) Large Intestine → Oesophagus → Stomach → Small Intestine, (c) Stomach → Small Intestine → Large Intestine → Oesophagus, (d) Small Intestine → Large Intestine → Oesophagus → Stomach, Ans. (a), 37. Select the incorrect statement, (a) RBC’s are produced by bone marrow and have a lifespan of 2 weeks only., (b) RBC’s are important for transport of gases, (c) RBC contain haemoglobin that gives red colour to the blood., (d) RbC’s ae biconcave in shape., Ans. (a), 38. The stars in the sky appear twinking due to, (a) Reflection of light (b) Atmospheric diffraction, Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 6-
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(c) Atmospheric refration (d) None of the above, Ans. (c), 39. A student obtains a sharp image of the distant window (W) of the school laboratory on the screen, (S) using the given concave mirror (M) to determine its focal length. Which of the following, distances should he measure to get the focal length of the mirror, , (a) MW (b) MS (c) SW (d) MW - MS, Ans. (b), 40. The carbon dioxide is transported via blood to lungs as, (a) dissolved in blood plasma only. (b) in the form of carbonic acid only., (c) in combination with haemoglobin only. (d) carbaminohaemoglobin and as carbonic acid., Ans. (d), 41. When a lens of focal length f is cut in two pieces transversly, the focal length of each part will, become, (a) twice (b) thrice (c) half (d) infinite, Ans. (a), 42. Which of the following group of animals have an incomplete double circulation systems., (a) Frog and Crocodile (b) Shark and Whale (c) Lizard and Pigeon (d) Toad and Lizard., Ans. (d), 43. A student does the experiment on tracing the path of a ray of light passing through a rectangular, glass slab for different angles of incidence. He can get a correct measure of the angles of incidence, and angle of emergence by following the labelling indicated in figure., , Ans. (d), 44. Tricuspid valve is present in, (a) Right atria and right ventricle (b) Left atria and left ventricle, (c) Wall of atrium (d) Wall of vetricle, Ans. (a), Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 7-
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45. The centre of the sphere of which the spherical mirror forms a part is called, (a) centre of curvature (b) focus (c) pole (d) vertex, Ans. (a), 46. Reema took two beakers and put a metal X in one beaker and metal Y in another beaker. She added, acid A in beaker containing X she observed the reaction is vigorous but when she added acid B in, second beaker the reaction was not as vigorous as in case of beaker containing X. When they placed, metal Y in the salt solution of metal X. The colour of solution changes from green to colourless., Which of the following statements is correct description of A, B and X, Y., (a) Acid A is a strong acid. (b) Acid B is strong acid., (c) Metal X is more reactive than Y. (d) Metal Y is less reactive than X., Ans. (a), 47. 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?, , Ans. (a), 48. Placement of another identical prism in an inverted position with respect to the first and allowing, the colours of spectrum to pass through it will, (a) change the spectrum into white light (b) change the spectrum into a black band, (c) keep the spectrum as before (d) split into more colours, Ans. (a), , 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:, Two metals X and Y form the salt XSO4 and Y2SO4 respectively. The solution of salt XSO4 is blue in, colour whereas that of Y2SO4 is colourless. When barium chloride solution is added to XSO4 solution,, then a white precipitate Z is formed along with a salt which turns the solution green. And when barium, chloride solution is added to Y2SO4 solution, then the same white precipitate Z is formed along with, colourless common salt solution., Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 8-
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49. What is the formula of the salt which turns the soluton green in the first case., (a) CaCl2 (b) CuCl2 (c) MgCl2 (d) BaCl2, Ans. (b), 50. The formula of salt XSO4., (a) CaSO4 (b) BaSO4 (c) CuSO4 (d) MgSO4, Ans. (c), 51. What could be the formula of white precipitate Z, (a) CuSO4 (b) CaSO4 (c) BaSO4 (d) None of these, Ans. (c), 52. The type of reaction occuring here, (a) Displacement (b) Double displacement (c) Neutralization (d) Combination, Ans. (b), Case Study-2:, A student performed an experiment to study for Photosynthesis. He inserted a part of the leaf of a, destarched plant into a conical flask containing potassium hydroxide. Potassium hydroxide solution, absorbs the carbon dioxide gas from the air present in the glass bottle. He left the plant into sunlight., After few hours, He performed a starch test to this and another leaf of the same plant. He observed that, leaf exposed to the atmosphere are bluish black. But leaf exposed to KOH does not change to blueblack colour., , 53. The above experiment proves that during photosynthesis, (a) carbon dioxide is necessary (b) oxygen is released, (c) organic substance is produced (d) chlorophyll is necessary, Ans. (a), 54. Which is correct regarding Photosynthesis?, (a) Carbondioxide is obtained from the atmosphere, (b) Water is absorbed from the soil through stem system, (c) Sunlight is trapped by xanthophyll pigment, (d) Chlorophyll absorbs green light, Ans. (a), 55. Which compound was used in the experiment to absorb Carbondioxide., (a) KMNO4 (b) HCl (c) KOH (d) NaOH, Ans. (c), 56. Bluish-black colour of leaf gives, (a) Presence of starch in the leaf. (b) absence of starch in the leaf., (c) Presence of water in the leaf (d) all of the above, Ans. (a), Prepared by: M. S. KumarSwamy, TGT(Maths), , Page - 9-
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Case Study-3:, When light passes from rarer to denser medium it bends toward the normal., , Using Snell’s law, μ1 sin θ1 = μ2 sin θ2 , , sin 1 2, , sin 2 1, , For μ2 > μ1 then θ2 < θ1, For μ1 > μ2 then θ1 < θ2, 57. One light wave is incident upon a plate of refractive index m. The incident angle i, for which, refractive and reflective waves are mutually perpendicular is, (a) i = tan–1(μ) (b) i = sin–1(μ) (c) i = cos–1(μ) (d) i = cot–1(μ), Ans. (a), 58. The angle of incidence in air for a ray of light is 40°. If ray travels through water of refractive index, 4/3. The angle of refraction is, (a) 20° (b) 25° (c) 28.82° (d) 29.76°, Ans. (c), 59. The velocity of light in air is 3 × 108 ms–1. If the refractive index of water is 4/3, the velocity of, light in water is, (a) 2.5 × 108 m/s (b) 1.5 × 108 m/s (c) 4.8 × 108 m/s (d) 6 × 108 m/s, Ans. (a), 60. Figure shows the path of ray of light passing through a glass slab. Which of the following statemens, is/are correct?, , (I) The refractive index of glass applying Snell’s law is 3, (II) The refractive index of glass applying Snell’s law is 2, (III) The speed of light decreases, (a) only I is true (b) only II is true (c) only II and III is true (d) only I and III is true, Ans. (c), , Prepared by: M. S. KumarSwamy, TGT(Maths), -, , Page - 10
