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PRACTICE PAPER 1, , Instructions, , Science Class 10th (Term I), , 1, This paper has 31 questions., 2. All questions are compulsory. Q. no. 1-28 cany 1 mark each and Q. nos. 29-31 cany 4mark each., 3. Answer the questions as per given instructions., , Time : 90 Minutes, , Max, Marks :, , 40, , Multiple Choice Questions, Direction (Q. Nos. 1-20) Bach of the, , question has four options out of which only, , one is correct. Select the correct option as, your answer., , 1. Which of the following reactions involves, the combination of two elements ?, (a)2C0+0, —+2C0,, , (b)NH, + HCI—> NH,CI, (c]2Mg+0, —» 2Mg0, , (djNO+ 0, —» 2NO,, , 2. When sodium carbonate is added to, two tubes (A) containing dil. HCl and (3), containing dil. NaOH, then which of the, following observations is correct ?, , {a) Ayellowédleured gas liberated intest tube A, , {b) A yellow @oloured gas liberated in test tube, 4 afd Golourless gas in test tube B, , {c) A@olourless ges liberated in test tube A, , {d} A colourless gas liberated in test tube B, , 3. The diagram shows the path of incident, rays to a concave mirror., , Object, — oO, , , , Where would the reflected rays meet, for the image formation to take place?, falBerindthe mirror — (b) Between F andO, {c) Between C and F (d)Beyond C, , 4, Which of the following is acidic in, nature ?, (a) Apple juice, (b)Lime water, {c) Soap solution, (d)Sogium bicarbonate, , 5. NaOH is a strong base because it, (a)can be oxidised, (b) gives OH" ions, {c)} can turn blue litmus dark red, (d) All of the above, , 6. What is the difference in water of, crystallisation of washing soda and, , gypsum ?, (al2 (b)4, (cl8 (g)), , 7. The element ‘X” of atomic number 16, forms basic oxide. The number of, electrons in X*~ ion will be, , (a)6 {b}14 (c}12 (ce) 18, 8. Which of the following is amphoteric, oxide ?, , {a)Na,0 (b)SO,, (c}Cad (d)AI,0,

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112, , 9. Which of the following gives nitrogen, dioxide on reacting with concentrated, nitric acid ?, fa) Pb, {b)Ca, [cl Al, {d)K, , 10. When a plane mirror is rotated through, a certain angle, the reflected ray turns, through twice or much and the size of, image, lalis doubled, (b}is halved, (cl becomes infinite, {dj remains same, , 11. On co er, it, ae ee, , fal white copper oxice, {b) yellow copper oxide, {cl red copper oxide, {d) black copper oxide, , 12. Choose the correct path of urin, body, , {a) Kidney — Ureter Urethra >, , bladder, {b) Kidney —» Urinary Urethra —>, bladder, , , , , , Ureter, {c) Kidney — Uret,, Urethra, , {d) Urinary, Uret, , Kidney + Ureter >, , 13. Ray: converge at a point 15, cm f a concave mirror, Where, , shou object be placed so that size, , of the image is equal to the size of the, , object ?, , {a 1S cm in front of mirror, , {b}30 cm in front of mirror, , {c) Between 15 cm and 30 cm in front of the, mirror, , {d) More thar 30 cm in front of the mirror,, , , , CBSE New Pattern ~ Science X (Term-I), , 14. The magnification m of an image, formed by a spherical mirror is, negative. It means, the image is, (a}srmaller than the object, (b)larger than the object, (clerect, (d)inverted, , 15. Which of the fo, light are involved in, rainbow?, (a) Reflection, a dispersion, (b) Refractiony tis: and scattering, , (c)Refra ‘on and internal, , of, ofa, , tering and reflection, , (b)+50, {cl+20 (d)-29, , 7. Which part of alimentary canal receives, bile from the liver?, {alStomach, (b) Small intestine, (c] Large intestine, (d)Oesophagus, , 18. Choose the correct statement that, describes arteries., , (a) They have thick elastic walls, blood flows, under high pressure; collect blood fram, different organs and bring it back to the, heart, , (>) They have thin walls with valves inside,, blood flows uncer low pressure and carry, blood away from the heart to various organs, of the body, , (c) They have thick elastic walls, blood flows, under low pressure carry blood frorn the, heart to various organs of the body, , (¢) They have thick elastic walls without valves, inside, blood flows under high pressure and, carry blood away from the heart to different, parts of the body

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rier on!, , Practice Paper 1, , 19. A light ray enters from medium A to, medium 8 as shown in figure, The, refractive index of medium B relative to, A will be, , Medum A, , {al greater than unity, {cl equal to unity, , 20. The breakdown of pyruvate into carbon, dioxide, energy and water takes place in, lal mitochondria (b) cytoplasm, {clendoplasmic reticulum {d) ribosomes, , Assertion-Reasoning MCOs, , Direction (Q. Nos. 21-28) For given, questions two statements are given-one, labeled Assertion (A) and the other laheled, Reason (R). Select the correct answer.to, these questions from the codes (a), (b)(@), and (d) as given below,, {e) Both A and R are true and Ris theGorrect, explanation of A., {b) Both A and R are true, BURR isnot the, correct explanation ofa,, {c) Ais true, but R istaisey, {d) Ais false, but R ietrue., , 21. Assertion When a mixture of hydrogen, and bromine is placed in sunlight,, hydrogen bromide is formed., , Reason It is an example of, combination reaction., , (bl less than unity, (d)zero, , 22. Assertion Magnesium ribbon burns in, the presence of oxygen., Reason Magnesium acts as an oxidising, agent,, , 23. Assertion Dry hydrogen chloride gas, does not change the colour of blue, litmus paper to red., , Reason Dry hydrogen chloride gas is, , Sele ig) ae tl ly, , 113, , 24. Assertion If a ray of light is incident on, a convex mirror along its principal axis,, then the angle of incidence as well as, the angle of reflection for a ray of light, will be zero,, , Reason A ray of light going towards, the centre of curvature ofeonvex mirror, is reflected back along the same path., , 25. Assertion Linear magnification of a, mirror has no unit,, , Reason The ratio of height of the, image to the height of the object is the, linear magnification produced by, mirror., , 26. Assertion The light of violet colour, deviates the most and the light of red, colour the least, while passing through, @ prism., , Reason For a prism material, refractive, index is highest for red light and lowest, for the violet light,, , 27. Assertion Raw materials needed for, photosynthesis are carbon dioxide,, water and minerals., , Reason Nutrients provide energy to an, organism,, , 28. Assertion All the arteries carry, oxygenated blood from the heart to, various organs., , Reason Pulmonary vein carries, oxygenated blood to the heart., , Case Based MCQs, , 29. Read the following and answer any four, questions from {i) to {v)., All the chemical changes are, accompanied by chemical reactions and, these are represented with the help of, chemical equations. Chemical equation is, a method of representing a chemical, reaction with the help of symbols and, formulae of the substances involved in it., , WWW.JEEBOOKS.IN

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114, , In a chemical equation, the reacting, species (molecule, atom, ion) are known, as reactants (the substances that undergo, chemical change in the chemical, reaction) and the new species formed as a, result of the reaction are called products, (the new substances formed during, reaction)., , HCl(ag) + NaOQH(ag) ——»>, , Hydsochloric acid Sodsum hydroxide, rs, , Rescans _NaCl(ag) +H,0(0), Sodium chloride Water, , Products, A chemical equation is a short hand, method of representing a chemical, reaction. A balanced chemical equation, has equal number of atoms of different, elements in the reactants and products, side. Law of conservation of mass is, followed in a balanced chemical equati, , (i) What will be the value of “’, “y’ ang, in the following reaction ? y, , Ba(OH), + xNH,Cl —+ Baa, nn, , 42H,0, lalx=2, y=3 z=1 (tik=5y'=2, 2=2, (c)xmt ya2, 2035 ; Ca)xe2,¥=2,2=2, , , , . +, (ii) Which of the followin g is incorrect, about balanced chemical equation ?, , {a) It tells us about the physical state of, reactantand products., , {b) tt.tells GS about tne number of atoms or, Molecules of the reactants and products, formed., , {c) It gives idea about feasibility of particular, reaction., , {d) It conveys the information about symbols, and formulae of all the substances involved, ina particular reaction., , (iii) The balanced chemical equation is, based on, , fal law of combining volumes, , (b}law of conservation of mass, , icuey of constant propa, , , , , , , , , , CBSE New Pattern ~ Science X (Term-1), , (iv) Which of the following is unbalanced, equation?, , (al3Fe+ 4H,0 —> Fe,0, + 4H,, (b)2Na#CO, —> Na,CO, + H,0+CO,, , (c} 8CD, + 124,0 —> C,H,.0, + 40, + 6H,0, (d)Caco, —+ CaO + 00,, , (v) Which of the following i is s cortect about, physical state ?, (a}2Na(s}+ 24,0(/)—», (b)Mg{s)+ H, SO. log) -— Mi s)+ HAg), (clCaC0,{s) 1+C0,{g), Wiete aE 25 2hgls)+ Br,, , 30. Read the foll and answer any four, questions from a to {v)., When the rays of light travels from one, transparent medium to another medium,, the path of rays is deviated. This, menon is called the refraction of, . The bending of light depends on, the optical density of medium through, which the light passes., , OH laq+ H, (9), , , , , , , , The speed of light varies from medium to, medium. A medium in which the speed, of light is more is optically rarer medium, whereas in which the speed of light is less, is optically denser medium., , Whenever light goes from one medium, to another, the frequency of light does, not change. However, speed and, wavelength change. It is concluded that, the change in speed of light is the basic, cause of refraction., , (i) When light ray travels from glass to air,, the ray bends, (altowards the normal, (b)away from normal, (cl anywhere, (d)do not bend, , WWW.JEEBOOKS.IN

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Practice Paper 1, , (ii), , When a ray passes from a medium A to, B, no bending occurs if the ray of light, hits the boundary of medium 8 at an, angle of, , fa}o°, , (b} 45°, , (c}90°, , (d}120°, , (iii) When light passes from a denser, , medium to a rarer medium, the, frequency of light in the second, medium, , lal increases, , (b} decreases, , {c] remains same, , {d} None of the, , (iv) A light ray passes from glass to water., The sp, , (v), , 31., , of light, , lal increases, , , , 115, , lex organisms have special fluids, within their bodies to transport such, materials and blood is the most commonly, used one,, , Lymph also helps in transport of certain, substances of comparison be the two, is given below is the table., , poner blood, iclremains sarre, , irst i 0 acids More thanin Less than that in, (d} first increases then decreases ; fluid: 1, , The bottom of pool filled wi, , due to refraction, appears, , {al shallower, , {b} deeper, , {clat some depth ¢, , (d) empty, , Read the fo answer any four, questions (v)., , All the need nutrients,, , oxy, er essential substances, for functioning., , Also, the waste and harmful substances, need to be removed continuously for, healthy functioning of cells., Therefore, there is a dire need for a, , well-developed transport in living, organisms., , Oxygen More than in —_Less than that in, blood, , other fluids, , Carbon dioxide Little More, , (i) Which among the following is a, similarity between Blood and Lymph ?, (al Blood clotting, (b) Unidirectional flow, (c) Protection against diseases, (d) Presence of haemoglobin, , (ii) Amount of blood corpuscles observed, , in a dengue patient shows variation,, Which among the following is observed, in a person affected with dengue fever?, (a) Increase in RBC count, , (b) Decrease in WBC count, , (c] Decrease in Platelet count, , (d) Decrease in RBC count