À ] Ç Z ] X - Evidyarthi - CBSE, English, French, German, FREE … · Paper – 1 CBSE Class IX Science Term 2 Sample Paper – 1 Time: 3 hrs Total Marks: 90 General Instructions:

Paper – 1

CBSE ClassIXScience

Term2 SamplePaper–1

Time:3hrs TotalMarks:90

GeneralInstructions:

1. Thequestionpapercomprisesoftwosections,AandB.Youaretoattemptboththesections.Allquestionsarecompulsory.

2. All questions of Section A and all questions of Section B are to be attemptedseparately.

3. Question numbers1 to3 in SectionA areonemark questions. These are to beansweredinonewordorinonesentence.

4. Questionnumbers4 to6 inSectionA are twomarks questions.Theseare tobeansweredinabout30wordseach.

5. Questionnumbers7to18inSectionAarethreemarksquestions.Thesearetobeansweredinabout50wordseach.

6. Questionnumbers19to24inSectionAarefivemarksquestions.Thesearetobeansweredinabout70wordseach.

7. Question numbers25 to33 inSectionB aremultiple choice questions based onpractical skills.Eachquestion isaonemark question.Youare to selectonemostappropriateresponseoutofthefourprovidedtoyou.

8. Questionnumbers34to36inSectionBarequestionsbasedonpracticalskillsand

aretwomarksquestions.

SECTIONA Attemptallquestionsfromthissection.

1. Giveoneexamplewherekineticenergyistransferredfromoneobjecttoanother. [1]

2. Whatarepolyatomicions? [1]

3. Whatarethedifferentstatesinwhichwaterisfoundduringthewatercycle? [1]4. Flash and thunder areproduced simultaneously. Yet, thunder is heard a fewseconds

aftertheflashisseen,why?Howdoesthespeedofsoundinairvarywiththeriseinthe densityofthemedium? [2]

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5. Explain thetermvariablevalencywiththehelpoftwoexamples. [2]

6. Writetwopointsofdifferencesbetweengymnospermsandangiosperms. [2]

7. (a)Drawadiagramdepictinglowpitchedsoundandhighpitchedsound. [3] (b)Whenapersonusesdeodorantspray,theotherpersonstandingatadistancewould hearthesoundofsprayingfirstandthefragranceofthespraywouldreachhim

later.Whyso? 8. [3]

(a) Anobject'P'ofmass‘m’isliftedfromapointAonthegroundtopointBataheight

'h'abovetheearthbyRinaandMita,butthepathtakenbybothofthemfordoingit

isdifferent(asshowninfig.IandII).Calculatetheworkdoneinboththesituations.

(b) Intheabovegivencases,whichforceisdoingpositiveworkandwhichoneisdoing

negativework?

9.WhatisSONAR?Forwhatisitused?Explainitsworkinginbrief. [3]

10.Definework.Underwhatconditions,workissaidtobedonebyaforceonanobject?

11.Statethreeconditionsnecessaryforhearingsound.

[3]

[3]

12.Calculatethenumberofmoleculesofsulphurpresentin16gofsolidsulphur. [3]13.

(a)Ifanelement‘M’hasmassnumber27andatomicnumber13,howmanyprotons andneutronsdoesitsatomcontain?WhatvalencywillbeshownbyM?

[3](b)Writetheelectronicconfigurationofanatomwithatomicnumber6.

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www. 14.Writeashortnoteongreenhouseeffect. [3] 15.Givetwoexamplesofeachofthefollowing: [3]

(a)Diseaseswhichspreadthroughair. (b)Diseaseswhichspreadthroughwater. (c)Diseaseswhichspreadthroughinsects.

16. Whatprecautionscanyoutakeinyourschooltoreducetheincidenceofinfectious

diseases?Mentionanythreepoints. [3]

17. [3]

(a) Listanytwobenefitsofclassification.(b) Whybryophytesandpteridophytesgrowinmoistandshadyplaces?

18.Whataretheeffectsofairpollutiononhumanbeings? [3]

19. [5](a) Definekineticenergy.Giveexamples.(b) Obtainanexpressionforthekineticenergyofanobjectofmass'm'andpossessinga

velocity'v'. 20.Drawalabeleddiagramofauditorypartsofthehumanearandexplainhowthehuman

earworks.[5] 21.Defineelectrovalencyandcovalency.Describetheformationofacovalentbondwith

thehelpofanexample. [5]

22. [5]

(a) Describeoxygencyclewiththehelpofadiagram.(b) Howdoesdepletionoftheozonelayertakeplace?

23. [5]

(a) Definethefollowingterms:i. Lichensii. Cryptogamaeiii. Phanerogams

(b) Whywhalesarenotgroupedinfishes?(c) Whatisbilateralsymmetry?

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24. [5] (a) Howcholeraisspreadthroughwater?(b) Whatisanantibiotic?GiveoneexampleCBSE IX │SCIENCE

25.Reverberationproducedinlargeauditoriumsisdueto: [1]

(a) Reflectionofsoundbywindows.(b) Absorptionofsoundbywalls.(c) Reflectionofsoundbywallsandceiling. (d)Absorptionofsoundbyfloor.

26. Watermeniscusinagraduatedcylinderisofconcaveshape.Whilefindingthevolume,

thecorrectreadingwillcorrespondto: [1] (a) Theupperendofthemeniscus(b) Thelowerendofthemeniscus(c) Themidpointofthemeniscus (d)Anywhereonthemeniscus

27. Whiledeterminingthedensityofthematerialofasphereusingaspringbalanceanda

measuringcylinder,astudentnotedthefollowingreadings: [1] i. Massofthesphere=81gii. Readingofwaterlevelinthecylinderwithoutthesphereinit=54mliii. Readingofwaterlevelinthecylinderwiththesphereinit=63ml Onthebasisoftheseobservations,thedensityofthematerialofthesphereis: (a) 1500kgm‐3(b) 6000kgm‐3(c) 7000kgm‐3 (d)9000kgm‐3

28. Astudentlowersasolidinacontainerfilledwithaliquid.Hefindsthatthereis

maximumapparentlossintheweightofthesolidwhen: [1] (a) Itjusttouchesthesurfaceoftheliquid.(b) Itiscompletelyimmersedintheliquid.(c) Itispartiallyimmersedintheliquid. (d)Itispartiallyimmersedandalsotouchesthesidesofthecontainer.

29. Anobjectexertsaforce‘F’onasurfaceofsurfacearea‘A’.Thepressure‘P’actingonthe

surfaceisgivenby: [1] (a) P=F/A(b) P=A/F(c) P=FA(d) P=F/A2

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CBSE IX │SCIENCE

Sample Paper – 1 30.Intheexperimentofverificationofreflectionofsound,theincidentsoundisdirected

along:[1]

(a) Theaxisofthetube.(b) Thenormaltotheaxisofthetube.(c) anangleof30ofromtheaxisofthetube. (d)anangleof45ofromtheaxisofthetube.

31. Inthefigureoftheearthwormgivenbelow,thehorizontallinesthroughoutthebody

representthe: [1]

(a) Cellsofthebody.

(b) Cellwallsseparatingthecellsofthebody.(c) Verticallyarrangedmusclesofthebody.(d) Septaseparatingthesegmentsofthebody

32.Thecharacteristicfeaturestoidentifyanervecellare: [1]

(a) Roundorovalcellswithablobbednucleusandcytoplasmicgranules.(b) Cellbodywithbranchedcytoplasmicextensionsatoneendandalongprojectionat

theotherend.(c) Spindleshapedcellwithabigcentralnucleus.(d) Redcolored,biconcavediscshapedenucleatedcells.

33.Accordingtothelawofconservationofmass,massofreactantswillbeequaltothe

massof:[1] (a) Products(b) Catalysts(c) Gasesevolved(d) Apparatususedforreaction

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CBSE IX │SCIENCE

Sample Paper – 1 34.Thefeaturewhichplacestheminthesamephylumis: [2]

(a) Pointedhead

(b) Bulkythorax(c) Presenceofscales (d)Postanaltail

35. 6.4gofMgCO3onheatinggave2.88gofMgOand3.52gofCO2.Whatwillbethetotal

massoftheproducts?Whichlawofchemicalcombinationwillgovernyouranswer? Whichlawofchemicalcombinationgovernsthis?Explainthelaw. [2]

36.Astudentwhileverifyingthelawsofreflectionofsoundmeasuredtheanglebetween

theincidentsoundwaveandthereflectedsoundwaveas110o.Whatwillbetheangle

ofreflection?Statethelawofreflectionofsoundwhichwasusedtoobtaintheangleof

reflection.[2]

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CBSE IX │SCIENCE

CBSE ClassIXScience

Term2 SamplePaperSolution

SECTIONA 9. Inagameofbilliards, theplayerprovideskineticenergy to thecueballbystriking it

withacuestick.Ifthecueballcollideswithanotherball,itwillslowdownandtheball

itcollidedwithwillgainspeedaskineticenergyistransferredtoit.10. Agroupofatomscarryingapositiveornegativechargeonthemarecalledpolyatomic

ions;Example‐ammoniumionNH4+,hydroxideionOH‐,sulphateionSO42‐.11. Thedifferentstatesinwhichwaterisfoundduringthewatercycleareliquid(water),

gas(watervapour)andsolid(snow).12. In the process of lightning, flash and thunder are produced simultaneously. Flash is

seenalmostimmediatelybecausethespeedoflightisextraordinarilyfastbutthunder

isheardafewsecondslaterbecausethespeedofsoundislessthanthespeedoflight.

Thespeedoflightincreaseswithanincreaseinthedensityofthemedium.

13. Variablevalency:Sometimes,sameelementmayexhibitonevalencyinonecompound

andanothervalencyinanothercompound.Thispropertyiscalledvariablevalency.

Examplesofelementsexhibitingvariablevalenciesareasfollows:

Element Symbol Valenciesexhibited (variablevalencies)

Copper Cu 1,2 Cu+1,Cu+2

Silver Ag 1,2 Ag+1,Ag+2

Gold Au 1,3 Au+1,Au+2

Iron Fe 2,3 Fe+2,Fe+3

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Sample Paper – 1 Solution 6.DifferencesbetweenGymnospermsandAngiosperms:

Gymnosperms Angiosperms i.Theseedsarenaked. i.Theseedsareenclosedbyafruitwall.ii.Themicrosporesandmegaspores ii.Themicrosporesareproducedinareproducedbymaleandfemale antherswhilethemegasporesare cones. producedintheovulesoftheovaryin

flowers. 7.

(a)

5. The soundof the sprayingdeodorant travels through thevibrationsof air layers

andso,itreachesfirst.However,thefragranceofthedeodorantreachestheother

person through the actual movement of air particles and therefore takes more

time.

8.

(b) Workdone=Force×displacement ma×s

Herethedisplacement‘s’isheight‘h’ = m×gxh= mgh(PotentialEnergy)

Inboththesituations,W=mgh,sinceitisindependentofthepathfollowedanddependsonlyontheinitialandfinalpositions.

(b) Muscularforceisdoingpositiveworkasitisinthedirectionofmotion.

Gravitationalforceisdoingnegativeworkasitisoppositetothedirectionof

motion

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9. SONARstandsforSOundNavigationAndRanging.

It isadeviceusedtomeasurethedistance, thedirectionandthespeedof theobjectslyingunderwaterusingultrasonicwaves.Itcomprisesofa transmitterandareceiver.Powerfulpulsesofultrasoundwavesaresentoutatregularintervalsfromatransmittermountedonaship.Whenthesepulsesareinterceptedbysubmergedobjects,theyarereflected.Thereflectedsoundorechoisdetectedbyanunderwaterreceiver,whichisalsomountedontheship.Ift=timeintervalbetweentransmissionandreceptionofreflectedultrasoundwave, v=speedofsoundthroughwater, d=distanceoftheobjectthatreflectedtheultrasound,thenDistance=speed×time Intimeinterval‘t’,thesoundwavestraveltwicei.e.2d2d=vt ⇒d=vt/2 Thisgivesthedistanceoftheobjectlyingunderwater.

10.Workdonebya forceonanobject is equal to theproductof themagnitudeof force

exerted on the object and the distance travelled by the object in the direction of theforce.Theconditionsfordoingworkare: i. Aforceshouldactonanobject.ii. Theobjectmustbedisplaced. Ifanyoftheabovetwoconditionsarenotsatisfied,workisnotdone.

11. Thethreeconditionsnecessaryforhearingsoundare:

i. There must be a vibrating object capable of transferring its energy to itssurroundings.

ii. Theremustbe amaterialmedium topickupenergyand thenpropagate it in theforwarddirection.

iii. Theremustbeareceiver,soastoreceivethesoundvibrationsandtransmitthemto

thebrainforfinalinterpretation,suchasthehumanear. 12.

MolecularmassofS8=8×Atomicmassofsulphur=832=256

g.256gofsulphur(S8)=1mole

16gofsolidsulphur=

1×16=

1moles

256 16

AccordingtoAvogadro'slaw, 1moleofsulphur(S8)contains6.022×1023

161molesofsulphur(S8)contain=6.022×1023×161molecules

Hence,16gofsolidsulphurhas0.376×1023=3.76×1022molecules. www.topperlearning.com

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CBSE IX │SCIENCE

13.

(a) Given:Atomicnumberofelement‘M’=13Massnumberofelement‘M’=27Since,Numberofprotons=Atomicnumber Numberofprotonsintheatomofanelement‘M’willbe13.Numberofneutrons=MassnumberNumberofprotons

= 2713= 14

Atomicnumber=13 Therefore,electronicconfigurationwillbe=2,8,3

K L M

2 8 3

Sincethereare3electronsinthevalenceshelloftheatomofanelement‘M’,valencywillbe3.

(b)Given:

Atomicnumber=6

Electronicconfiguration=2,4K L 4

(d) Thegreenhouseeffectisanaturalphenomenonwhichtrapsradiationwithintheearth's

atmosphere. Natural greenhouse gases include water vapor, carbon dioxide, nitrousoxideandmethanewhichareessentialtosupportlife.The greenhouse effect is the cause of global warming. It is an irreversible,

environmental condition inwhichharmfulgasesproducedbyhumanbeingsbuildup

andtrapheatwithintheearth'sprotectiveatmosphericshield,calledtheozonelayer.

Anincreaseintheamountofsuchgasesintheatmospherewouldcauseanincreasein

theaveragetemperatureoftheearth. 15.

(a) Diseaseswhichspreadthroughair:Commoncoldandtuberculosis.(b) Diseaseswhichspreadthroughwater:Jaundiceandtyphoid.(c) Diseaseswhichspreadthroughinsects:Malariaanddenguefever.

16. Precautions that can be taken in your school to prevent the incidence of infectious

diseasesare:(a) Preventionofwaterloggingtoavoidmosquitobreeding.(b) Provisionofsafedrinkingwater.(c) Periodiccleaningoftoilets.

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Sample Paper – 1 Solution

17.

(a) Itmakesstudyoforganismseasy.

Itgivesinter‐relationshipamongstdifferentgroupsofanimal. Itgivesusanideaaboutexistinglifeforms. Classificationisthebasefordevelopmentofotherbranchesofbiologicalscience.

(Anytwo) Bryophytesandpteridophytesgrowinmoistandshadyplacesbecausetheyrequire

waterforfertilisation.

30. Theeffectsofairpollutionare:

Air pollution can have serious consequences on the health of human beings.Humanbeingsmaysuffer fromrespiratoryproblems,highbloodpressure, renalproblems,eyeirritation,problemsinnervoussystemetc.

Air pollution causes falling of leaves, reduced growth of plants, degeneration ofchlorophylletc.

Airpollutionleadstoacidrainwhichfurtherdamagessoil,plants,buildingsetc. 19.

(d) Kineticenergyofanobjectistheenergypossessedbythebodybyvirtueofitsstateof motion. A speeding vehicle, a rolling stone, a flying aircraft, flowing water,blowingwind,arunningathleteetc.possesskineticenergy.

(e) Consideranobjectofmass‘m’inastateofmotionwithaninitialvelocity‘u’.Letaconstant force ‘F’ act on the object and displace it through a distance‘s’ in thedirectionoftheforceapplied. ∴Workdoneontheobjectbytheforce,W=F.s‐‐‐‐‐‐‐(1) Duetotheworkdoneontheobject,achangeinvelocitytakesplace.Letthevelocityoftheobjectchangefrom‘u’to‘v’.Let‘a’betheaccelerationproduced. Then,accordingtotheequationofmotion, 2 2

=2as

v ‐u

s

v2 u2

‐‐‐‐‐‐‐(2)

2a

Weknowthataccordingtothesecondlawofmotion,F=ma‐‐‐‐‐(3) Substituting(2)and(3)in(1)weget:

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v2u2

WorkdoneontheobjectW=F.s=(m.a)

2a

CBSE IX │SCIENCE


Obviously, theworkdoneon theobject isequal to thekineticenergy imparted to the

object. Thus, the kinetic energy possessed by an object of mass ‘m’ moving with a

uniformvelocity‘v’isgivenby:

Ek12mv2

20.Theearallowsus toconvertpressurevariations in theairwithaudible frequencies into

electricsignalswhichtravelthroughthebrainviaauditorynerves.Humanearconsistsof

threecompartments:outerear,middleearandinnerear.Thestructureofthehumanearis

asshownbelow:

The outer ear is called pinna. It collects the sound from the surroundings. The collected

soundpasses throughtheauditorycanal.At theendof theauditorycanal, there isa thin

membrane called the ear drum or the tympanicmembrane.When a compression of the

mediumreachestheeardrum,thepressureontheoutsideofthemembraneincreasesand

forces the eardrum inward. Similarly, the eardrum moves outward when a rarefaction

reachesit.Inthisway,theeardrumvibrates.Thevibrationsareamplifiedseveraltimesby

three bones (the hammer, the anvil and the stirrup) in the middle ear. The middle ear

transmitstheamplifiedpressurevariationsreceivedfromthesoundwavetotheinnerear.

1 2 2

2m(v u)

1 2

Astheobjectstartsfromrest,u=0hence,W

2mv

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In the innerear, thepressurevariationsare turned intoelectrical signalsby thecochlea.

These electrical signals are sent to the brain via the auditory nerves, and the brain

interpretsthemassound.

SE IX │SCIENCE

21.Electrovalency

Whenoneatomtransfersoneormoreelectronstoanotheratom,thebondformedbetweenthemisknownasanelectrovalentbondorelectrovalency.

Covalency Thenumberofelectronssharedbyoneatomofanelementtoachievethenearest

inertgaselectronconfigurationisknownasitscovalency. FormationofCovalentBond When both atoms in a reaction need to gain electrons to complete their octet,

sharingofelectronstakesplace. Let us study how a Chlorine molecule is formed in order to understand the

formationofacovalentbond. Formationofachlorinemolecule AChlorineatomhassevenelectronsintheoutermostshell. WhentwoChlorineatomscombine,theyshareoneelectroneachtoformashared

pair of electrons, thus completing both their octets. Hence, a Chlorine molecule

existsasCl2.

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22. (d) Oxygen‐cycle:Oxygenfromtheatmosphere isusedincombustion,respirationand

intheformationofoxidesofnitrogen.Itisreturnedtotheatmospherethroughphotosynthesis.

36. Chlorofluorocarbonsusedassolvents,refrigerants,propellantsandblowingagents

forplasticfoamsarestableandpersistintheatmosphereforyears.Theseenterthe

upper layers of the atmospherewhereUV radiation causesCFCs todissociate the

ozoneintooxygen. 23.

(a) i. Lichens: Some fungal species live in permanent mutually dependentrelationships with blue‐green algae. Such relationships are called symbioticrelationsandthesymbioticlifeformsarecalledlichens.

ii. Cryptogamae:Thereproductiveorgansofthethallophytes,thebryophytesandthepteridophytesareveryinconspicuousandaretherefore,called‘cryptogamae’.Itmeansplantswith‘hiddenreproductiveorgans'.

iii. Phanerogams:The plantswithwell differentiated reproductive tissueswhichultimatelymakeseedsarecalledphanerogams’.

(b) Whalescanswiminwaterlikefishesbutarenotfishastheyrespirewithlungsandhavefourchamberedheartandmammaryglands;so,theyaremammals.

(c) Whenthebodyofanorganismcanbecutintotwoequalhalveswhicharethemirror

image of each other by one plane then the organism is said to have bilateral

symmetry.

www.topperlearning.com

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CBSE IX │SCIENCE


24.

(a) Waterbornediseasesoccur if theexcretaofsomeonesufferingfroman infectiousgutdisease,suchascholera,getsmixedwithdrinkingwaterusedbypeople livingnearby. The cholera causing microbes will enter into the body of the new hostthroughthewater theydrinkandcausethemthedisease.Suchdiseasesaremuchlikelytospreadintheabsenceofsafesuppliesofdrinkingwater.

(b) Antibiotic is a chemical substance secreted by microorganisms which at low

concentrationlevels,havetheabilitytodestroyorinhibitthegrowthofpathogens.

Example–Penicillin

SECTIONB 25. (c)

Reflectionofsoundbywallsandceilingcausesreverberationinanauditorium.

26. (b)

Thecorrectreadingwillcorrespondtothelowerendofthemeniscus.

27.(d)

Density

Mass

Volume 63‐54

ml=9ml

3

Volumeofthesolid= =9cm

Densityofthesolid=

81g39gcm

3

9000kgm3

9cm

28. (b)Whenthesolidiscompletelyimmersedintheliquid,thereismaximumapparentlossin

itsweightduetomaximumvolumeoftheliquiddisplaced.29. (a)

ThePressure‘P’actingonthesurfaceistheforce‘F’actingperunitarea.Thus,P=F/A30. (a)

Theincidentsoundisdirectedalongtheaxisofthetubetoavoidloss.

31. (d)

Thehorizontallinesonthebodyoftheearthwormshowseptaseparatingthesegments

ofthebody. 32. (b)

Nervecellshaveacentralcellbodywithbranchedcytoplasmicextensionsatoneend

andalongprojectionattheotherend.

ww.topperlearning.com 9

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CBSE IX │SCIENCE


33. (a)

Accordingtothelawofconservationofmass,inachemicalreaction,masscanneither

becreatednordestroyed.Thetotalmassofthereactants isequaltothetotalmassof

theproducts.

34. (d)Postanaltailplacesbothoftheminthesamephylum.

35. Fromthegivendata,weget,

MgCO3 MgO+CO2

6.4g 6.4g

2.88g3.52g

Massofthereactant(MgCO3)= 6.4g

Massoftheproducts(MgO+CO2)=(2.88+3.52)g=

Since,massofthereactantisequaltothemassoftheproducts;therefore,theseresultsareinagreementwiththelawofconservationofmass. Thelawofconservationofmassstatesthatinachemicalreaction,masscanneitherbecreatednordestroyed. Thetotalmassofthereactantsisequaltothetotalmassoftheproducts.

36. Giventhat:

ir110 Accordingtothelawofreflectionofsound: ir rr1102r

110r55

Accordingtothelawofreflectionofsound,angleofincidenceisequaltotheangleof

reflection.i=r.Withhelpofthis,wegetthattheangleofreflection=55°.

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À ] Ç Z ] X - Evidyarthi - CBSE, English, French, German, FREE … · Paper – 1 CBSE Class IX Science Term 2 Sample Paper – 1 Time: 3 hrs Total Marks: 90 General Instructions: