Science 10 Past Paper PDF 2021-2022, AQA

## WEST CLUSTER SAHODAYA CLUSTER SCHOOLS CHENNAI ### SUBJECT: SCIENCE ### CODE: 086 ### CLASS X, 2021-22 **MAX MARKS:** 40 **TIME:** 90 min. **General Instructions:** 1. The Question Paper contains three sections. 2. Section A has 24 questions. Attempt any 20 questions. 3. Section B has 24 questi...

## WEST CLUSTER SAHODAYA CLUSTER SCHOOLS CHENNAI ### SUBJECT: SCIENCE ### CODE: 086 ### CLASS X, 2021-22 **MAX MARKS:** 40 **TIME:** 90 min. **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** 1. A student heated ferrous sulphate crystals in a boiling tube. What would he/she observe? - A. Brown residue was formed along with pungent smelling gases. - B. Black residue was formed. - C. Brown gas was evolved with brown residue. - D. Yellow residue was formed along with colourless gas. 2. is the fixed number of water molecules chemically attached to each formula unit of a salt in its crystalline form. - X. None of the above - B. Water of crystallisation - .Water content - D. Hydration 3. Which of the following reactions is not correct: - A. Mg + 2HCl → MgCl2 + H2 - B. Zn + CuSO4 → ZnSO4 + Cu - C. 2Ag + Cu(NO3)2 → 2AgNO3 + Cu - D. Fe + CuSO4 → FeSO4 + Cu 4. The reaction between MnO2 with HCl is depicted in the following diagram. It was observed that a gas with bleaching abilities was released - A diagram of the reaction is shown with HCl(aq) above an arrow pointing to the right, MnO2 on the left of the arrow, and a box labeled "Products" on the right of the arrow. The chemical reaction between MnO2 and HCl is an example of: - A. Decomposition reaction - B. Displacement reaction - C. Combination reaction - D. Redox reaction 5. 2Pb(NO3)2 2PbO + nA + O2 What is nA in the above reaction? - A. NO2 - B. 4NO - C. 4NO2 - D. 2PbNO2 6. Which one of the following processes involves chemical reactions? - A. Heating copper wire in the presence of air at high temperature. - B. Storing of oxygen gas under pressure in a gas cylinder. - C. Liquefaction of air. - D. Keeping petrol in a china dish in the open. 7. A table with two columns, "METAL" and "GAS EVOLVED" is shown. The following chemical reaction - Metal|GAS EVOLVED - --------|-------- - MANGANESE|YES - IRON|YES - MAGNESIUM|YES - ZINC|NO Which of the following two combinations are correct? - A. ii and iv - B. i and iii - C. i and iv - D. ii and iii 8. The chemicals that can be used as an acid-base indicator by a visually impaired student is - A. Turmeric - B. Petunia leaves - C. Vanilla essence - D. Phenolphthalein 9. If an unknown solution turns blue litmus red, then the pH of the solution is more likely to be - A. 4 - B. 12 - C. 10 - D. 7 10. A student took two test tubes containing 2ml of dilute hydrochloric acid and added zinc granules to test tube (A) and solid sodium carbonate to test tube (B). - A diagram of two test tubes is shown, each containing liquid and an object. The first tube is labeled (A), the second (B). One labeled "Zinc granules" is in the first tube, the other "solid sodium carbonate" is in the second. The correct observation would be- - A. No reaction in any of the test tubes. - B. Rapid reaction in both test tubes - C. Slow reaction in (A) and rapid reaction in (B) - D. Rapid reaction in (A) but a slow reaction in (B) 11. During respiration, exchange of gases takes place in - A. Throat and larynx - B. Trachea and larynx - C. Alveoli of lungs and capillaries - D. Alveoli and throat 12. Which of the following statement(s) is true about respiration? - A. None of the above - B. During inhalation, ribs move inward and the diaphragm is raised - C. In the alveoli, exchange of gases takes place, that is O2 from alveolar air diffuses into blood & CO2 from blood into alveolar air sacs - D. Hb has greater affinity for CO2 than O2. Alveoli does not help in increasing surface area for exchange of gases 13. Choose the event that does not occur in photosynthesis. - A. Reduction of CO2 to carbohydrate. - B. Absorption of light energy by chlorophyll - C. Oxidation of Carbon to CO2 - D. Conversion of light energy to chemical energy 14. The opening and closing of stomatal pore depends upon - A. Temperature - B. O2 - C. guard cells - D. concentration of CO2 in stomata 15. If Salivary amylase is lacking in saliva, which of the event in mouth will be affected – - A. Absorption of Vitamins. - B. Proteins breaking down into Amino acids - C. Starch breaking down into sugars - D. Fats breaking down into fatty acids and glycerol 16. One celled thick blood vessels are called - A. pulmonary artery - B. Arteries - C. veins - D. capillaries 17. Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror A goes on increasing but that in mirror B remains the same. - A. mirror A is convex and mirror B is concave - B. mirror A is concave and mirror B is convex - C. mirror A is plane and mirror B is concave - D. mirror A is concave and mirror B is plane 18. The figure given below shows the image of a clock as seen in a plane mirror. - A diagram of a clock is shown, displaying 02:35. The correct time is: - A. 9.25 - B. 2.25 - C. 2.35 - D. 6.45 19. A magnified real image is formed by a concave mirror when the object is - A. both A and B - B. at F - C. between F and C - D. at C 20. The refractive index of transparent medium is greater than one because - A. Frequency of light wave changes when it moves from rarer to denser medium - B. Speed of light in vacuum < Speed of light in transparent medium - C. Speed of light in vacuum > Speed of light in transparent medium - D. Speed of light in vacuum = Speed of light in transparent medium 21. When a beam of white light falls on a glass prism, the colour of light which will deviate least is- - A. Blue - B. Violet - C. Red - D. Green 22. An object AB is placed in front of a convex lens at its focus as shown in the figure given below. - A diagram of a convex lens is shown with AB, the object, on the left, and F and F' on the right of the lens. Which of the ray diagram below correctly depicts the refraction through the lens L? - Four ray diagrams are shown, each with a convex lens in the center, an AB on the left of the lens, and F and F’ on the right. Each diagram varies by the positioning and orientation of the rays extending from the object and the lens. 23. The figure below 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 - A diagram shows a ray of light moving from medium A to medium B, with angles of incidence and refraction labeled. - A. √2 - B. √3/√2 - C. √2/√3 - D. 1/√2 24. After tracing the path of a ray of light through a glass prism a student marked the angle of incidence Zi, angle of refraction ∠r, angle of emergence Ze and the angle of deviation ∠D as shown in the diagram. The correctly marked angles are: - A diagram shows a triangular prism with a ray of light traveling through it, labeled with: Zi, Zr, Ze, and ∠D - A. Zi, Zr and Ze - B. Zi and r - C. Zi and Ze - D. Zi, Ze and ∠D ## SECTION B 25. Foul-smelling of eatables prepared by using oil and fat is due to: - A. reaction with oxygen in air - B. reaction with nitrogen in air - C. reaction with CO2 in air - D. reaction with sulphur dioxide in air 26. Surya takes three beakers A, B and C filled with aqueous solutions of glucose, alcohol and hydrochloric acid respectively as shown in the following figure: - A diagram shows three beakers, labeled A, B, and C, with a battery bulb connected to each by wires. The beakers contain glucose, alcohol, and hydrochloric acid respectively, each with a graphite rod extending into the solution. Which of the following statement is correct in terms of glowing of bulb when the switch is ON? - A. All the bulbs glow. - B. Bulb A and B do not glow but bulb C glows. - C. Bulb A and C do not glow but bulb B glows. - D. Bulb B and C do not glow but bulb A glows. 27. - A diagram shows a chemical equation, with Gypsum as the reactant and Gypsum and H2O as the products. Identify the correct option from the given table which represents the type of reactions occurring in step 1 and step 2. - A table with two columns, "endothermic" and "exothermic" with letters A, B, C, and D in the first and a checkmark indicating true or false in the second, for each letter. 28. The diagram shows the reaction between metal and water. - A diagram shows four test tubes, each containing a different metal and water. What is the reason for different behaviour of Ca in test tube B? - A. Ca reacts with water to produce CO2 gas which helps in floating - B. Ca is lighter element than water - C. Ca does not react with water - D. Ca reacts with water to produce H2 gas which helps in floating 29. Sodium Carbonate when added to acetic acid evolves a gas. Which of the following are true about the gas evolved? - (i) It turns lime water milky - (ii) It puts out burning splinter - (iii) It dissolves in sodium hydroxide solution - (iv) It has pungent smell. - A. 1 and 4 - B. 1 and 2 - C. 1, 2 and 3 - D. 2,3 and 4 30. Which of the following will turn red litmus blue? - A. Baking soda - B. Amla juice - C. lemon juice - D. Soft drink **Directions:** In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as. - A. Both A and R are true and R is the correct explanation of A. - B. Both A and R are true but R is NOT the correct explanation of A. - C. A is true but R is false. - D. A is false and R is True. 31. Assertion (A): Plaster of Paris is used by doctors for setting fractured bones. Reason (R): When Plaster of Paris is mixed with water and applied around the fractured limbs, it sets into a hard mass. 32. Assertion (A): Decomposition of vegetable matter into compost is an example of exothermic reactions. Reason (R): Exothermic reactions are those reactions in which heat is absorbed. 33. Assertion (A): Although bile juice has no digestive enzymes it is still considered to be very important during digestion of food. Reason (R): Bile provide alkaline medium and emulsifies fat. 34. Assertion (A): Red light travels faster in glass than green light. Reason (R): The refractive index of glass is less for green light. 35. A student took the samples of four metals A, B, C and D and added following solutions one by one. The results obtained have been tabulated as follows: - A table with five columns, "Metal", "Iron (II) Sulphate", "Copper (II) Sulphate", "Zinc Sulphate", and "Silver Nitrate" with letters A, B, C, and D in the first column and "Displacement", "No reaction", "Displacement", and "No reaction" in the remaining. Which of the following will displace Cu from its solution of sulphate: - A. None of the above - B. A only - C. B only - D. Both A and B 36. In which of the following Vertebrate group / groups, heart does not pump oxygenated blood to different parts of the body? - A. Amphibian only - B. Amphibians and pisces - C. Amphibians and reptiles - D. Pisces only 37. The cellular energy reserves in autotrophs is - A. fatty acids - B. glycogen - C. starch - D. protein 38. The pancreas pour their secretions into - A. Duodenum - B. Small intestine - C. Large intestine - D. Stomach 39. Which of the following statements is true? - A. A concave lens has -4 dioptre power having a focal length 0.25m. - B. A convex lens has 4 dioptre power having a focal length 0.25m. - C. A convex lens has -4 dioptre power having a focal length 0.25m. - D. A concave lens has 4 dioptre power having a focal length 0.25m. 40. The focal length of a small concave mirror is 2.5cm. In order to use this concave mirror as a dentist's mirror, the distance of tooth from the mirror should be - A. 3.5 cm - B. 2.5 cm - C. 1.5 cm - D. 4.5 cm 41. The image shows the transport of gases in the body through the heart and lungs. - A diagram shows a heart with arrows showing the flow of blood, through the pulmonary artery, the lungs, the pulmonary vein, and the aorta. Which option correctly shows the transport of oxygen to the cell? - A. Lungs → Pulmonary artery → right atrium - right ventricle → vena cava → body cells - B. Lungs → Pulmonary vein → left atrium → left ventricle → aorta → body cells - C. Lungs → Pulmonary vein → right atrium → right ventricle → aorta → body cells - D. Lungs → Pulmonary artery → left atrium → left ventricle → vena cava → body cells 42. Given below is the figure of a stomata. Select the correct labelling for this diagram. - A diagram shows a stoma, with an arrow pointing to the left and another showing it pointing to the right, with four circles beside it. - A. 1 chloroplast, 2 stoma, 3 epidermal cells, 4 guard cell - B. 1 epidermal cells, 2 stoma, 3 guard cell, 4 chloroplast - C. 1 guard cell, 2 stoma, 3 epidermal cells, 4 chloroplast - D. 1 stoma, 2 epidermal cell, 3 chloroplast, 4 guard cell 43. An object of height 10cm is placed in front of a convex lens having focal length of 12 cm. The object is placed at a distance of 36 cm in front of the lens. How many times is the image likely to be magnified? - A. 2 times - B. 1/2 times - C. 3 times - D. 4 times 44. A Student determines the focal length of a device X, by focusing the image of a far off object on the screen positioned as shown in figure. The device X is a - A diagram shows a device marked "X" with a screen on the right and a ray of light coming from the left, and an arrow pointing toward the right. - A. Concave mirror - B. Convex lens - C. Concave lens - D. Convex mirror ## SECTION C **Frothing in Yamuna:** The primary reason behind the formation of the toxic foam is high phosphate content in the wastewater because of detergents used in dyeing industries, dhobi ghat. Yamuna's pollution level is so bad that parts of it have been labelled 'dead' as there is no oxygen in it for aquatic life to survive. - A photo of a river with froth is shown. 49. Predict the pH value of the water of river Yamuna if the reason for froth is high content of detergents dissolved in it. - A. 7 - B. 10-11 - C. 5-7 - D. 2-5 50. Which of the following statements is correct for the water with detergents dissolved in it? - A. equal concentration of both hydroxide ion (OH-) and hydronium ion (H3O+). - B. low concentration of hydroxide ion (OH-)and high concentration of hydronium ion (H3O+). - C. high concentration of hydroxide ion (OH-) and low concentration of hydronium ion (H3O+). - D. high concentration of hydroxide ion (OH-) as well as hydronium ion (H30'). 51. The table provides the pH value of four solutions P, Q, R and S - A table with two columns, "Solution" and "pH value", with the letters P, Q, R, and S in the first column and the numbers 2, 9, 5, and 11 in the second. Which of the following correctly represents the solutions in increasing order of their hydronium ion concentration? - A. S<P<Q<R - B. P>Q>R>S - C. P>S>Q>R - D. S<Q<R<P 52. High content of phosphate ion in river Yamuna may lead to: - A. decreased level of dissolved oxygen and decreased growth of algae - B. decreased level of dissolved oxygen. - C. decreased level of dissolved oxygen and no effect of growth of algae. - D. increased level of dissolved oxygen and increased growth of algae. Given are the section of two pipes, A and B. If you need to represent blood vessels with these, which of the pipes would correspond to the artery and which one to a vein. Identify it and answer the following questions. - Two diagrams of pipes are shown, the first labeled A and the second B. 53. 'B' is best defined as the vessel which - A. always carry blood from one visceral organ to another visceral organ. - B. always supply oxygenated blood to the different organs - C. always carry blood away from the heart to different organs - D. always break up into capillaries that reunite to form a vein 54. In 'A', valves are present to check backward flow of blood flowing at - A. all of these - B. atmospheric pressure - C. high pressure - D. low pressure 55. Which of the following statements is correct regarding 'A'? - A. All of these - B. Carries blood from an organ towards the heart - C. Always carry oxygenated blood with single exception - D. Carries blood from heart towards the organ 56. Blood pressure in the pulmonary vein is - A. more than pulmonary artery - B. less than that of pulmonary artery - C. same as in vena cava - D. less than that in vena cava Aditya and his friend Manoj placed a candle flame in front of a convex lens at various distances from it and obtained the image of the candle flame on a white screen. He noted down the position of the candle, screen and the lens as under Position of candle = 20 cm Position of convex lens = 50 cm Position of the screen = 80 cm - A diagram of a candle, a convex lens, and a screen is shown, labeled with dimensions. 57. What is the position of the image formed from the convex lens? - A. 60 cm - B. 80 cm - C. 50 cm - D. 30 cm 58. What is the focal length of the convex lens? - A. 16 cm - B. 30 cm - C. 15 cm - D. -16 cm 59. Where will the image be formed if he shifts the candle towards the lens at a position of 35 cm? - A. Between F2 and F1 - B. At focus - C. Between focus and pole - D. At infinity 60. Which of the following statement describes the best about the nature of the image formed if Aditya shifts the candle towards the lens to 36 cm? - A. The nature of the image formed will be real, inverted and diminished - B. The nature of the image formed will be virtual, inverted and magnified. - C. The nature of the image formed will be virtual, erect and magnified. - D. The nature of the image formed will be virtual, erect and diminished.