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4/10/2015 CBSEClassXIISciencePhysicsBoardPaper2004AllIndiaSet1Solutions
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CBSE ClassXIIScience BoardPapers Physics BoardPaper2004,Set1+2RecommendthisonGoogle
GeneralInstructions:(i)Allquestionsarecompulsory.(ii)Thereare30questionsintotal.QuestionNos.1to8areveryshortanswertypequestionsandcarryonemarkeach.(iii)QuestionNos.9to18carrytwomarkseach,question19to27carrythreemarkseachandquestion28to30carryfivemarkseach.(iii)Thereisnooverallchoice.However,aninternalchoicehasbeenprovidedinonequestionoftwomarksonequestionofthreemarksandallthreequestionsoffivemarkseach.Youhavetoattemptonlyoneofthechoiceinsuchquestions.(iv)Useofcalculatorsisnotpermitted.
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Questions
Whyisshortwavebandusedforlongdistanceradiobroadcast?
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Q1
TwometalsAandBhaveworkfunctions2eVand5eVrespectively.Whichmetalhaslowerthresholdwavelength?
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Q2
Drawthevoltagecurrentcharacteristicofazenerdiode.
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Q3
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4/10/2015 CBSEClassXIISciencePhysicsBoardPaper2004AllIndiaSet1Solutions
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Asolenoidwithanironcoreandabulbisconnectedtoad.c.source.Howdoesthebrightnessofthebulbchangewhentheironcoreisremovedfromthesolenoid?
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Q4
Peakvalueofe.m.fofana.c.sourceisE0.Whatisitsr.m.svalue?
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Q5
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Q6
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Q8
Anelectricdipoleoflength4cm,whenplacedwithitsaxismakinganangleof60uniformelectricfield,experiencesatorqueof Nm.Calculatethe(i)magnitudeoftheelectricfield(ii)potentialenergyofthedipole,ifthedipolehaschargesof
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Q9
Explainhowtheresistivityofaconductordependsupon(i)numberdensityand(ii)relaxationtime.
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Q10
TwolongparallelstraightwiresXandYseparatedbyadistanceof5cminaircarrycurrentsof10Aand5Arespectivelyinoppositedirections.Calculatethemagnitudeanddirectionoftheforceona20cmlengthofthewireY.
Or
Q11
4/10/2015 CBSEClassXIISciencePhysicsBoardPaper2004AllIndiaSet1Solutions
file:///C:/Users/ntpc/Desktop/phy%201.html 3/8
Acircularcoilof100turns,radius10cmcarriesacurrentof5A.Itissuspendedverticallyinauniformhorizontalmagneticfieldof0.5T,thefieldlinesmakinganangleof60ofthecoil.Calculatethemagnitudeofthetorquethatmustbeappliedonittopreventitfromturning.
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AbarmagnetMisdroppedsothatitfallsverticallythroughthecoilC.Thegraphobtainedforvoltageproducedacrossthecoilvs.timeisshowninfigure(b).(i)Explaintheshapeofthegraph.(ii)Whyisthenegativepeaklongerthanthepositivepeak?
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Q12
T.V.towerhasaheightof400matagivenplace.Calculateascoveragerange,iftheradiusoftheearthis6400km.
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Q13
Drawaraydiagramofanastronomicaltelescopeinthenormaladjustmentposition.Writedowntheexpressionforitsmagnifyingpower.
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Q14
GivethelogicsymbolforanORgate.DrawtheoutputwaveformforinputwaveformsAandBforthisgate.
Q15
4/10/2015 CBSEClassXIISciencePhysicsBoardPaper2004AllIndiaSet1Solutions
file:///C:/Users/ntpc/Desktop/phy%201.html 4/8
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StateGausstheoreminelectrostatics.Usingthistheorem,deriveanexpressionfortheelectricfieldintensityduetoaninfiniteplanesheetofchargedensityC/m
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Q16
A10Fcapacitorischargedbya30Vd.c.supplyandthenconnectedacrossanuncharged50Fcapacitor.Calculate(i)thefinalpotentialdifferenceacrossthecombination,and(ii)theinitialandfinalenergies.Howwillyouaccountforthedifferenceinenergy?
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Q17
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Q18
ThecircuitdiagramshowstheuseofapotentiometertomeasureasmallthermocoupleconnectedbetweenXandY.ThecellC,ofemf2V,hasnegligibleinternalresistance.ThepotentiometerwirePQis1.00mlongandhasaresistanceof5pointSisfoundtobe400mmfromP.CalculatethevalueofemfV,thermocouple.
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Q19
UsingBiotSavartlaw,deduceanexpressionforthemagneticfieldontheaxisofacircularQ20
4/10/2015 CBSEClassXIISciencePhysicsBoardPaper2004AllIndiaSet1Solutions
file:///C:/Users/ntpc/Desktop/phy%201.html 5/8
currentloop.Drawthemagneticfieldlinesduetoacircularcurrentcarryingloop.OrAhydrogenionofmassmandchargeqtravelswithaspeedvinacircleofradiusmagneticfieldofintensityB.Writetheequationin4termsofthesequantitiesonly,relatingtheforceontheiontotherequiredcentripetalforce.Hencederiveanexpressionforitstime.
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Auniformmagneticfieldgetsmodifiedasshownbelow,whentwospecimensXandYareplacedinit.
(i)IdentifythetwospecimensXandY.(ii)StatethereasonforthebehaviourofthefieldlinesinXandY.
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Q21
Twonarrowslitsareilluminatedbyasinglemonochromaticsource.Namethepatternobtainedonthescreen.Oneoftheslitsisnowcompletelycovered.Whatisthenameofthepatternnowobtainedonthescreen?Drawintensitypatternobtainedinthetwocases.Alsowritetwodifferencesbetweenthepatternsobtainedintheabovetwocases.
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Q22
Redlight,howeverbrightitis,cannotproducetheemissionofelectronsfromacleanzincsurface.Butevenweakultravioletradiationcandoso.Why?Xraysofwavelengthfallonphotosensitivesurface,emittingelectrons.Assumingthattheworkfunctionofthesurfacecanbeneglected,provethatthedeBrogliewavelengthof
electronsemittedwillbe .
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Q23
Definetheterms:halflifeperiodanddecayconstantofaradioactivesample.Derivetherelationbetweentheseterms.
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Q24
4/10/2015 CBSEClassXIISciencePhysicsBoardPaper2004AllIndiaSet1Solutions
file:///C:/Users/ntpc/Desktop/phy%201.html 6/8
Whenadeuteronofmass2.0141uandnegligiblekineticenergyisabsorbedbyalithiumnucleusofmass6.0155u,thecompoundnucleusdisintegratesspontaneouslyintotwoalphaparticles,eachofmass4.0026u.Calculatetheenergyinjoulescarriedbyeachalphaparticle.(1u=1.661027kg)
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Q25
Whatismeantbyremotesensing?Brieflyexplainhowitiscarriedout.Mentionanytwoapplicationsofremotesensing.
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Q26
Whatisanopticaldetector?Stateitsthreeessentialcharacteristics.Namethefactorwhichdecideshowgoodadetectoris.
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Q27
Withthehelpofalabelledcircuitdiagram,explainhowannpntransistorcanbeusedasanamplifierincommonemitterconfiguration.Explainhowtheinputandoutputvoltagesareoutofphaseby180foracommonemittertransistoramplifier.OrForannpntransistorinthecommonemitterconfiguration,drawalabelledcircuitdiagramofanarrangementformeasuringthecollectorcurrentasafunctionofcollectoremittervoltageforatleasttwodifferentvaluesofbasecurrent.Drawtheshapeofthecurvesobtained.Definetheterms:(i)outputresistanceand(ii)currentamplificationfactor.
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Q28
Whatisinducedemf?WriteFaradayslawofelectromagneticinduction.Expressitmathematically.Aconductingrodoflengthlwithoneendpivoted,isrotatedwithauniformangularspeedaverticalplane,normaltoauniformmagneticfieldB.Deduceanexpressionfortheemfinducedinthisrod.InIndia,domesticpowersupplyisat220V,50Hz,whileinUSAitis110V,50Hz.Giveoneadvantageandonedisadvantageof220Vsupplyover110Vsupply.
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Q29
4/10/2015 CBSEClassXIISciencePhysicsBoardPaper2004AllIndiaSet1Solutions
file:///C:/Users/ntpc/Desktop/phy%201.html 7/8
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Completethepathofincidentrayoflight,showingtheformationofarealimage.Hencederivetherelationconnectingobjectdistanceu,imagedistanceR,andtherefractiveindicesn1andn2ofthetwomedia.Brieflyexplain,howthefocallengthofaconvexlenschanges,withincreaseinwavelengthofincidentlight.
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Q30
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