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CBSE Sample Question Paper Term 1, Class — X (Session : 2021 - 22), , SUBJECT - SCIENCE - 086 - TEST - 01, Class 10 - Science, , Time Allowed: 1 hour and 30 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, Attempt any 20 questions, The pale green colour of the solution after half an hour when iron nails are dipped in copper [0.8], sulphate solution is due to the formation of, , a) FeS b) FeS2, c) FeSO3 d) FeSO4, The steps involved in making a slide of the epidermal peel of leaf are given as follows: [0.8], , A. Pull out a thin peel from the lower surface of the leaf., B. Place a drop of glycerine on the slide., , C. Stain the peel in safranin., , D. Place the stained peel of the glycerine., , E. Remove the extra stain by washing with water., , F. Place the coverslip over the peel., , Which one is the correct sequence of steps to be followed?, , a) A, B, C, D, E, F b) A, B, D, C, E, F, c) A, C, E, B, D, F d) A, C, D, B, E, F, A dilute ferrous sulphate solution was gradually added to the beaker containing acidified [0.8], , permanganate solution. The light purple color of the solution fades and finally disappears., Which of the following is the correct explanation for the observation?, , a) FeSO, acts as an oxidising agent and b) KMn0O, is an oxidising agent, it, , oxidises KMn04 oxidises FeSO,, , c) KMn0O, is an unstable compound and d) The colour disappears due to, dilution; no reaction is involved
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10., , 11., , decomposes in presence of FeSO, to, , a colourless compound., A student obtained a sharp image of the grill of a window in the laboratory on a screen, [0.8], using a convex lens. For getting better results, her teacher suggested focusing on a distant, tree instead of the grill. In which direction should the lens be moved for this purpose to get a, , sharp image on the screen?, a) behind the screen b) very far away from the screen, , c) towards the screen d) away from the screen, While performing an experiment to determine the percentage of water absorbed by raisins, [0.8], the following data was obtained: Mass of water taken in the beaker = 50 g Mass of raisins, before soaking them in water = 5 g Mass of raisins after soaking in water for 2 hours = 8 g., The percentage of water absorbed by raisins would be :, , a) Se x 100 ny G8 x 100, c) ee x 100 d) ere x 100, , Under which of the following conditions a concave mirror can form an image larger than [0.8], the actual object?, , a) When object is kept at a distance b) When object is placed between the, greater than its radius of curvature focus and centre of curvature, , c) When the object is kept at a distance d) When object is kept at a distance less, , equal to its radius of curvature than its focal length, , Phenomenon responsible for the twinkling of stars [0.8], a) Atmospheric refraction b) Internal refraction, c) None of these d) Regular refraction, , Name a body part where anaerobic respiration takes place. [0.8], a) Mitochondria b) Chloroplast, c) Protoplasm d) Cytoplasm, , The critical angle for diamond is [0.8], a) 930 b) 180°, ©) 50° d) 240, , Which colour of light has the longest wavelength? [0.8], a) Violet b) Green, c) Yellow d) Red, , A student had drawn the diagram of stomata as shown below in a hurry. He could not be [0.8], , given full marks as he, , stoma
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12,, , 13., , 14,, , 15., , 16., , a) did not label the stoma in its correct b) forgot to draw nuclei in guard cells, , position and also to label the diagram, c) did not draw nuclei, in guard cells d) should have drawn nuclei and, and other cells chloroplasts in guard cells and, , nuclei in all epidermal cells, Aluminum is used for making cooking utensils. Which of the following properties of [0.8], aluminum are responsible for the same?, i. Good thermal conductivity, ii, Good electrical conductivity, iii. Ductility, iv. High melting point, , a) (i) and (ii) b) (i) and (iii), c) (ii) and (iii) d) @ and (iv), Which of the following phenomena of light are involved in the formation of a rainbow? [0.8], a) Refraction, dispersion and total b) Refraction, dispersion and internal, internal reflection reflection, c) Dispersion, scattering and total d) Reflection, refraction and dispersion, internal reflection, The chemical used to test the starch: [0.8], a) Methyl alcohol b) Safranin, c) Glycerine d) Iodine, , A student traces the path of a ray of light passing through a rectangular glass slab for three _[0.8], , different values of angle of incidence (i) namely 30°, 45°, 60°. He produces the incident ray, and measures the perpendicular distance, ], between the produced incident ray and the, emergent ray., , A, , , , , , , , , , , , He will observe that, , a) 'l keeps on increasing with increase b) T keeps on decreasing with increase, in angle of incidence. in angle of incidence., , c) Il’ remains the same for all three d) +} is maximum for Zi = 45° and is, angles of incidence. less than this value both for Zi =, , 30°and for Zi = 60°., When you place an iron nail in copper sulphate solution, the reddish-brown coating formed [0.8], , on the nail is
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Lh, , 18., , 19., , 20., , 21., , 22,, , 23,, , a) Smooth and shiny b) Rough and granule, , c) Soft and dull d) Hard and flaky, If a pencil beam is allowed to fall along the principal axis of a concave mirror, the ray will [0.8], a) emerge out along the principal axis b) deviate by 60°, c) retrace its path along the principal 4) deviate by 30°, axis, If the angle of incidence is increased for a pair of air — glass interface, then the angle of [0.8], , refraction will, , , , , , , , , , , , , a) increase b) remains the same, c) decrease d) first increases and then decreases, What is the spectrum of white light? [0.8], a) The band of 7 colours. b) None of these, c) The band of 6 colours. d) The band of 5 colours., anor [0.8], low, k !, /, Geminaing seeds L ) Se }-waur, In the experimental set-up shown above, KOH solution has been kept in the flask to, a) absorb carbon dioxide so astocreate _—b) react with water to generate oxygen., a particle vacuum, c) remove impurities present in the air d) create a dry atmosphere for wet, in the flask germinating seeds, Which acid is present in fatigued muscles? [0.8], a) Citric acid b) All of these, c) Acetic acid d) Lactic acid, , Out of the four experimental set-up shown below, which one will demonstrate the evolution [0.8], of carbon dioxide during respiration of germinating seeds ?, , Cotton. Rubber, Rubber., plug fea cork, , KOH, ‘solution, , , , Germinating Water, seeds, 1, , a) III b) I, , c)IV di, If parallel beams, non-parallel to principal axis fall on the convex lens, they converge at a [0.8], point:, , a) away from principal axis b) called focus on the axis, , c) on principal axis d) centre of curvature
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24, Whichis the correct condition for the total internal reflection to occur? [0.8], , a) All of these b) light should pass from rarer to, denser medium, c) light should pass from denser to d) Critical angle should be greater than, rarer medium angle of incidence, Section B, Attempt any 20 questions, 25. Solid sodium bicarbonate was placed on a strip of pH paper. The colour of the strip [0.8], a) turned blue b) turned light pink, c) did not change d) turned green and suddenly yellow, 26. Dry HCl gas does not show acidic nature because [0.8], a) itis dry b) it does not ionize to form H* and Cl”, ions, c) itis a polar covalent compound d) itis a gas, , 27. Which of the following phenomena contributes significantly to the reddish appearance of [0.8], the sun at sunrise or sunset?, , a) Scattering of light b) Total internal reflection of light, c) Dispersion of light d) Reflection of light from the earth, 28. Which one of the following properties is not generally exhibited by ionic compounds? [0.8], a) Electrical conductivity in solid state b) Electrical conductivity in molten, state, c) Solubility in water d) High melting and boiling points, 29. Which of the following statements is not correct? [0.8], , a) Some metals react with acids to give b) Some non metal oxides react with, , salt and hydrogen. water to form an acid., , c) All metal carbonates react with acid d) All metal oxides react with water to, to give a salt, water and carbon give salt and acid., dioxide., , 30. Which among the following statement(s) is(are) true? Exposure of silver chloride to sunlight [0.8], for a long duration turns grey due to, i, the formation of silver by decomposition of silver chloride, ii. sublimation of silver chloride, iii. decomposition of chlorine gas from silver chloride, iv. oxidation of silver chloride, , a) (i) and (iii) b) (ii) and (iii), , c) (iv) only d) @ only, 31. Assertion (A): Phenolphthalein gives pink colour in basic solution. [0.8]
