CLASS X (2020-21) SCIENCE (CODE 086) SAMPLE PAPER-2
Science X Sample Paper 2 Solvedwww.cbse.onlineCLASS X (2020-21)SCIENCE (CODE 086)SAMPLE PAPER-2Time : 3 HoursMaximum Marks : 80General Instructions :(i) The question paper comprises four sections A, B, C and D. There are 36 questions in the question paper. Allquestions are compulsory.(ii) Section–A - question no. 1 to 20 - all questions and parts thereof are of one mark each. These questions containmultiple choice questions (MCQs), very short answer questions and assertion - reason type questions. Answers to these should be given in oneword or one sentence.(iii) Section–B - question no. 21 to 26 are short answer type questions, carrying 2 marks each. Answers to thesequestions should in the range of 30 to 50 words.(iv) Section–C - question no. 27 to 33 are short answer type questions, carrying 3 marks each. Answers to thesequestions should in the range of 50 to 80 words.(v) Section–D – question no. 34 to 36 are long answer type questions carrying 5 marks each. Answer to thesequestions should be in the range of 80 to 120 words.(vi) There is no overall choice. However, internal choices have been provided in some questions. A student has toattempt only one of the alternatives in such questions.(vii)Wherever necessary, neat and properly labelled diagrams should be drawnimage of an object.Ans :Section A1.Concave mirrorThe pH of a sample of vegetable soup was found to be6.5. How is this soup likely to taste?[1]Ans : SourorLight enters from air to glass having refractive index1.50. What is the speed of light in glass? Speed of lightin air is 3 # 108 m/s.Ans :orWhy oxides of highly reactive metals cannot bereduced by carbon?Ans :It is because highly reactive metals themselves aregood reducing agents, so they can’t be reduced bycarbon.2.What is an alkali?Ans : An alkali is a base that dissolves in water.3.Write two reasons responsible for the late discovery ofnoble gases.[1]Ans :Speed of light in glass,8v c 3 # 10 2 # 108 m/sn1.57.[1]Why sky appears dark to the passengers flying at highaltitudes?[1]Ans :There is no atmosphere at high altitudes. Hence noscattered light can reach to the eye.5.Explain why we see the signthe some vehicles.Ans :front of[1]Because the image of laterally inverted written letterwill once again laterally inverted in the rear view mirrorof the vehicle going ahead and image so produced willbe erect image of the word AMBULANCE.6.Name a mirror that can give an erect and enlargedIf field lines of a magnetic field are crossed at a point,what does it indicate?[1]Ans :If the magnetic field lines would cross each other thenat the same point there would be two directions ofmagnetic field which is not possible.8.a. They are inert i.e., least reactive.b. They are less abundant in nature except Argon.4.[1]What type of core is used to make an electromagnet?[1]Ans :Soft iron core is used in making an electromagnet.9.Power of a lamp is 60 W. Find the energy in joulesconsumed by it in 1 s.[1]Ans :Given,Energy,P 60 W , t 1 sE VI h tE P # t 60 # 1 JE 60 JorWhy do we use copper and aluminium wire fortransmission of electric current?Get 20 Solved Sample Paper PDFs by whatsapp from 91 89056 29969/9530143210/9461443210Page 1
Science X Sample Paper 2 Solvedwww.cbse.onlineAns :Copper and aluminium wires are used for electrictransmission due to their low resistivity.10. Write the role of motor areas in brain.Ans :[1]Motor areas of the brain control the movement ofvoluntary muscles.11. Why isprocess?Ans :respirationconsideredanexothermic[1]Respiration is considered an exothermic process dueto breaking down of glucose/food in the presence ofoxygen with release of energy.orWhat role do digestive enzymes play in the alimentarycanal?Ans :Digestive enzymes break down complex molecules offood into simpler ones so that they can be absorbedby blood.12. How can the chromosomes be identified?Ans :[1]In human beings, the individual chromosomes areidentified by their lengths, position of centromere andbanding pattern on staining.orA normal baby girl receives her X chromosome fromwhom : mother, father, both mother and father oreither from mother or father?Ans :and reason (R) is the correct explanation ofassertion (A).Food cans are coated with tin not with zinc becausezinc is more reactive than tin, it can react with organicacids present in food.orAssertion : Platinum, gold and silver are used to makejewellery.Reason : Platinum, gold and silver are least reactivemetals.Ans : (a) Both assertion (A) and reason (R) are trueand reason (R) is the correct explanation ofassertion (A).Platinum, gold and silver are highly malleable lustrausand least reactive, i.e. noble metals, so they are notcorroded by air and water easily.16. Assertion : A network of food chains existing togetherin an ecosystem is known as food web.Reason : An animal like kite cannot be a part of afood web.[1]Ans : (c) Assertion (A) is true but reason (R) is false.In the food web different food chains are interconnected.Each chain consists of different trophic levels i.e.,producers, consumers and detrivoroes. So, kite canalso be a part of food web17. Read the following and answer any four question from(17.1) to (17.5) :1#4MetalIron(II) SulphateCopper(II) SulphateZincSulphateSilverNitrateANo on---CNo reactionNo reactionNoreactionDisplacementDNo reactionNo reactionNoreactionNo reactionFrom both mother and father.13. How is spinal cord protected?Ans :[1]Vertebral column made by vertebrae protects thespinal cord.For question numbers 14, 15 and 16, two statementsare given-one labelled Assertion (A) and the otherlabelled Reason (R). Select the correct answer tothese questions from the codes (a), (b), (c)and (d) asgiven below :(a) Both A and R are true and R is correct explanationof the assertion.(b) Both A and R are true but R is not the correctexplanation of the assertion.(c) A is true but R is false.(d) A is false but R is true.14. Assertion: Magnesium ribbon should be cleanedbefore burning in air.Reason: Magnesium ribbon is coated with a thin layerof dust containing moisture.[1]Ans : (b) Assertion is true but reason is false.15. Assertion : Food cans are coated with tin and notwith zinc.Reason : Zinc is more reactive than tin.[1]Ans : (a) Both assertion (A) and reason (R) are true17.1The most active metal is(a) A(b) B(c) C(d) DAns : (b) B is most reactive metal. B can displaceiron whereas no other metal can do.17.2The least reactive metal is(a) A(b) B(c) C(d) DAns : (d) D is least reactive metal.17.3The increasing order of reactivity of metal A, B,C and D is(a) A 1 B 1 C 1 D(b) D 1 C 1 B 1 A(c) D 1 A 1 C 1 B(d) D 1 C 1 A 1 BAns : (d) D C A B17.4Container of which metal can be used to storeboth zinc sulphate solution and silver nitratesolution?(a) A(b) C(c) B(d) DAns : (d) Container of D can be used to store bothDownload 20 Solved Sample Papers PDF from www.cbse.onlinePage 2
Science X Sample Paper 2 Solvedzinc sulphate solution and silver nitrate solution.17.5The metal which shows the displacement withiron (II) zulphate.(a) A(b) C(c) D(d) BAns : (d) B18. Read the following and answer any four question from(18.1) to (18.5) :1#4The ovary is a ductless reproductive gland in whichthe female reproductive cells are produced. Femaleshave a pair of ovaries, held by a membrane beside theuterus on each side of the lower abdomen. The ovaryis needed in reproduction since it is responsible forproducing the female reproductive cells, or ova.The ovary is a ductless reproductive gland in whichthe female reproductive cells are produced. Femaleshave a pair of ovaries, held by a membrane beside theuterus on each side of the lower abdomen. The ovaryis needed in reproduction since it is responsible forproducing the female reproductive cells, or ova.During ovulation, a follicle (a small cavity inthe ovary) expels an egg under the stimulation ofgonadotropic hormones released by the pituitarygland, the luteinizing hormone and the folliclestimulating hormone. The rest of the follicle, or thecorpus luteum, secretes the sex hormones estrogenand progesterone, which regulate menstruation andcontrol the development of the sex organs. The sexhormones and the gonadotropic hormones interactwith each other to control the menstrual cyclewww.cbse.onlinecycle (one in each cycle). The corpus luteum(R) is developed under the effect of productionof luteinising hormone (LH) from pituitarygland. The hormone progesterone secretedby it, maintains the uterine endothelium andstimulates secretion of water mucus fromuterine glands. Corpus albicans (S) secretes nohormone. P (primary follicle) and Q (Graafianfollicle) secrete estrogen which stimulates theproliferation of endometrial lining of the uterinewall.18.2The formation of T begins in female(a) at birth(b) before birth(c) after puberty(d) none of theseAns : (b) The formation of ova begins in female fetusbefore birth.18.3The term used for release of T is?(a) Ovulation(b) Proliferation(c) Fragmentation(d) FissionAns : Ovulation18.4Which the hormone secreted by R is?(a) Progesterone(b) Trilodothyronine(c) Thysoxine(d) CortisolAns : (a) R (Corpus luteum) secretes the hormoneprogesterone.18.5The name of part R is(a) Ovum(c) Corpus luteum(b) Oviduct(d) MedullaAns : (c) Corpus luteum19. Read the following and answer any four question from(19.1) to (19.5) :1#4Convex mirror is used as a rear view mirror in vehicles.Since the image of the object formed is small in size,the field of view is increased. Convex mirror is alsoused in street lights to diverge light over a large area.18.1Which of the following statements is correctregarding the labelled structures?(a) Before puberty, only structure T undergoesmeiosis.(b) The hormone produced by structure R stimulatesthe pituitary gland to secrete luteinsing hormone.(c) The hormone produced by structure S is responsiblefor the development of female secondary sexualcharacters.(d) The hormone produced by P and Q stimulatesthe proliferation of the endometrial lining of theuterine wall.Ans : (d) In the given figure of human ovary, P isprimary follicle, Q is mature Graafian follicle,R is corpus luteum, S is corpus albicans andT is secondary oocyte. Secondary oocyte (T)is formed only after puberty in a menstrual19.1The nature of image in driver’s mirror is(a) Erect and diminished(b) Virtual and undiminished(c) Erect and magnified(d) Virtual and magnifiedAns : (a) Erect and diminished19.2A person standing in front of a mirror findshis image thinner but with normal height. Thisimplies that the mirror is(a) convex and cylindrical with axis verticalGet 20 Solved Sample Paper PDFs by whatsapp from 91 89056 29969/9530143210/9461443210Page 3
Science X Sample Paper 2 Solvedwww.cbse.online(b) convex and cylindrical with axis horizontal(c) convex and spherical(d) concave and sphericalAns : (a) convex and cylindrical with axis vertical19.3A convex mirror is used to form the image of anobject. Then which of the following statement iswrong.(a) The image lies between the pole and the focus.(b) The image is diminished in size.(c) The image is erect.(d) The image is real.Ans : (d) The image is real.19.4The field of view of convex mirror is . ascompared to plane mirror.(a) large(b) small(c) equal(d) none of theseAns : (a) large19.5 f R is valid2(a) for convex mirrors but not for concave mirrors(b) for concave mirrors but not for convex mirrors(c) for both convex and concave mirrors(d) neither for convex mirrors not for concave mirrors.Ans : (c) for both convex and concave mirrors20. The following table given below shows the resistivityof three materials X, Y and Z. Analyse the table andanswer the following questions :1#4SamplesXYZResistivity3 # 10 911.1 # 10 618 # 10 1720.1The increasing order of conductivity of samples is(a) Y 1 X 1 Z(b) X 1 Y 1 Z(c) Z 1 X 1 Y(d) Z 1 Y 1 XAns : (a) Y 1 X 1 Z20.2The best conductor is(a) X(c) Z20.5In the following material, which has the lowresistivity(a) Copper(b) Iron(c) Mercury(d) None & theseAns : (a) CopperSection B21. What is the importance of DNA copying inreproduction? Why is variation beneficial to thespecies but not necessary for the individual? Explain.[2]Ans :DNA copying is essential part of reproduction becauseit ensures that same blueprint of the body design ismaintained. Variation for the species is beneficial foradaptation and better survival. It may result in newspecies formation.ora.“Recent fossils are found closer to the earth’ssurface”. Comment on the statement statingreason.b. List two factors which could lead to the rise ofnew species.Ans :a.This statement is correct as the fossils foundcloser to the surface of earth are more recent andthose found in deeper layers are older ones.b. Natural selection and genetic drift.22. Differentiate between auricles and ventricles.Ans :Auricle(b) Y(d) X and YAns : (c) Z20.3Which are these is best insulator?(a) X(b) Y(c) Z(d) None of theseAns : (b) YY is the best insulator as it has highest value ofresistivity. A bad conductor has high resistivity.20.4Electrical resistivity of a given metallic wiredepends upon :(a) Its length(b) Its thickness(c) Its shape(d) Nature of the materialAns : (d) Nature of the materialThe resistivity of a material depends on the natureand the temperature of the conductor, but not itsshape and size.Ventricle1. Upper thinchambers.2. Receiveveins.[2]bloodwalled Lower thickchambers.walledfrom Receive blood from theauricles3. Push blood into the Push blood into theventricles.arteries.23. A compound Z is formed by transfer of electrons fromthe metal X to a non-metal Y, Identify the type ofbond formed in the compound. List three propertiesof compound formed by such type of bonds.[2]Ans :The bond formed is ionic bond:a. The compound will have high melting and boilingpoint.b. It will be soluble in water.c. It will conduct electricity in molten state as wellas in aqueous solution.orGive reason for the following:a. School bells are made up of metals.b. Electrical wires are made up of copper.Ans :a.Metals are sonorous i.e., produce sound whenstruck with a hard substance.b. Copper is a good conductor of electricity and isDownload 20 Solved Sample Papers PDF from www.cbse.onlinePage 4
Science X Sample Paper 2 Solvedwww.cbse.onlineRating of bulb,highly ductile.I 100 mA24. In the following table, seven elements A, B, C, D, E, Fand G (here letters are not the usual symbols of theelements) of the Modern Periodic Table with atomicnumbers 3 to 18 are given:[2]34567A89E1112BC13141516D10I 100 # 10 3 AI 0.1 Aa.Power of bulb V # IP 5.0 # 0.1 WG1718P 0.5 WV IR ,R VIb.Fi. Which of these is (a) a noble gas, (b) a halogen?ii. If B combines with F , what would be the formulaof the compound formed?Ans :(i) (a) Since, G has atomic number 10 hence, it is anoble gas i.e., neon.(b) Since, F has atomic number 17 hence, it is ahalogen i.e., chlorine.(ii) Since, the valency of B and F is one hence, BFwill be the formula of the compound formed.25. Figure shows a ray of light meeting the glass of thewindow of a car at angle of incidence of 30c. [2]i.Assuming that the refractive index of glass is1.5, find the angle of refraction for this ray in theglass. (Given : sin (19.5c) 1/3 )ii. Complete the diagram by sketching the path ofthe ray through the glass and out on the otherside.Ans :i.Applying Snell’s law, let r be the angle ofrefraction.i 30c, n 1.5Refractive index, n sin isin rGiven,ii.sin r sin i sin 30cn1.5r 19.5cV 5.0 Volt.R 5.0 Ω0.1R 50 ΩSection C27. How does control and coordination take place inplants?[3]Ans :The function of control and coordination in plantsis performed by chemical substances known as planthormones or phytohormones.The synthesis and action of phytohormones aregreatly influenced by external stimuli. Plants respondto photoperiodic stimulus by specialised pigmentpresent in very small quantity called phytochrome.Thus, phytohormones and phytochromes togetherare involved in control and coordination between theenvironment and plant responses.orExplain the process of break down of glucose in a cell(i) in the presence of oxygen (ii) in the absence ofoxygen.Ans :i.In the presence of oxygen : In all the pathways,the first step in break down of glucose, a six carbonmolecule, into a three carbon molecule calledpyruvate. This process occurs in the cytoplasmof the cell. In aerobic respiration break down ofpyruvate using oxygen takes place in mitochondria.It breaks up the three carbon pyruvate moleculeto give three molecules of carbon dioxide, waterand lots of energy as compared to anaerobicrespiration.GlucoseGlycolysisIn cytoplasmPyruvic acidsKreb's cycleIn mitochondria O 2is requiredCO 2 H 2 O energyii. In the absence of oxygen : In the absence ofoxygen pyruvate may be converted into ethanoland carbon dioxide which is referred to asfermentation that takes place in yeast.26. A bulb is rated at 5.0 V, 100 mA. Calculate its (a)power and (b) resistance.[2]Ans :Given,GlucoseGlycolysisIn cytoplasmIn yeastin the absenceof oxygenPyruvic acidsC 2 H 5 OH CO energySometime anaerobic respiration also occurs in ourGet 20 Solved Sample Paper PDFs by whatsapp from 91 89056 29969/9530143210/9461443210Page 5
Science X Sample Paper 2 Solvedwww.cbse.onlinemuscle cells, when there is lack of oxygen, i.e., duringvigorous muscular activities. At that time pyruvate isconverted into lactic acid which is also a three carbonmolecule. This build-up of lactic acid in our musclescauses fatigue or muscular cramps.GlycolysisGlucoseIn cytoplasmIn musclesInn the absence of oxygenPyruvic acidsLactic acid energy28. i. Write the chemical formula for washing soda.ii. How may it be obtained from baking soda?iii. Name an industrial use of washing soda otherthan washing clothes.[3]Ans :i.The chemical formula of washing soda isNa 2 CO 3 10H 2 O .ii. Baking soda (NaHCO3) is strongly heated to formsoda ash.2NaHCO 3 s h heat Na 2 CO 3 H 2 O l h CO 2 g hThe soda ash is dissolved in boiling hot water soas to obtain its saturated solution. The saturatedsolution so obtained is allowed to cool, whenwashing soda crystals separate out.Na 2 CO 3 10H 2 O Na 2 CO 3 10H 2 Oiii. Washing soda is used in the manufacture of glass.29. What are plant hormones? Give its examples.Ans :[3]In plants, certain chemical substances are necessaryfor the purpose of proper growth and development.These chemical substances are called plant hormonesor phytohormones. These are the most importantcoordinating substances in plants.Examples : Auxin, gibberellin, cytokinin, ethylene,and abscisic acid.30. Name the hormones secreted by the following endocrineglands and specify one function of each:[3](a) Thyroid (b) Pituitary (c) PancreasAns :Thyroid : Secretes Throxine. It regulatesmetabolism of carbo hydrates, fats and proteins.b. Pituitary : Secretes growth harmone. Growthharmone regulates growth and development ofbody.c. Pancreas : Secretes insulin. Insulin lowers bloodsugar level.a.31. Write an equation each for decomposition reactions,where energy is supplied in the form of heat, light orelectricity.[3]Ans :i.Energy is supplied in the form of heat during thedecomposition of ferrous sulphate crystals.2FeSO 4 s hheatFe 2 O 3 s h SO 2 g h SO 3 g hii. Energy is supplied in the form of light, when silveriodide decomposes to form silver and iodine.2AgI s hlight2Ag s h I 2 s hiii. Energy is supplied in the form of electricity, whenmolten lead bromide decomposes to lead andbromine.PbBr2 l helectricityPb s h Br2 l h32. Out of the elements H(1), Be(4), Na(11) and Mg(12).i. Write the pair of elements having similar chemicalproperties.ii. State the group number of each pair,iii. Name one another element belonging to each ofthese groups.[3]Ans :i.Be(4) and Mg(12) have similar chemical properties.H(1) and Na(11) have similar chemical properties.ii. Be and Mg belong to group 2, H and Na belongto group 1.iii. K belongs to group 1 and Ca belongs to group 2.33. iName and d
Download 20 Solved Sample Papers PDF from www.cbse.online Page 2 Science X Sample Paper 2 Solved www.cbse.online Ans : Copper and aluminium wires are used for electric transmission due to their low resistivity. 10. Write the role of motor areas in brain. [1] Ans : Motor areas of the brain control the movement of voluntary muscles. 11.
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Introduction to Science Section 2 The Branches of Science, continued The branches of science work together. -biological science: the science of living things botany, ecology -physical science: the science of matter and energy chemistry: the science of matter and its changes physics: the science of forces and energy -earth science: the science of the Earth, the
