phy 2
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Tweet 0 CBSE » Class XII Science » Board Papers » Physics » Boar +2 Recommend this on Google General Instructions: (i) All questions are compulsory. (ii) There are 30 questions in total. Question Nos. 1 to 8 are very short answer ty mark each. (iii) Question Nos. 9 to 18 carry two marks each, question 19 to 27 carry three m to 30 carry five marks each. (iii) There is no overall choice. However, an internal choice has been provided in one question of three marks and all three questions of five marks each. You have choice in such questions. (iv) Use of calculators is not permitted. 0 Share Questions Why is shortwave band used for long distance radio broadcast? VIEW SOLUTION Q1 Two metals A and B have work functions 2 eV and 5 eV respectivel threshold wavelength? VIEW SOLUTION Q2 Draw the voltagecurrent characteristic of a zener diode. VIEW SOLUTION Q3 Subjects Home Study Textbook Solutions Test Revise Ask & Answer 265k Like Purchase 01140705070 or Call me What are you looking for?
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4/10/2015 CBSEClassXIISciencePhysicsBoardPaper2004AllIndiaSet1Solutions
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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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Home Study TextbookSolutions Test Revise Ask&Answer
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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
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4/10/2015 CBSEClassXIISciencePhysicsBoardPaper2004AllIndiaSet1Solutions
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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
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4/10/2015 CBSEClassXIISciencePhysicsBoardPaper2004AllIndiaSet1Solutions
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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
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4/10/2015 CBSEClassXIISciencePhysicsBoardPaper2004AllIndiaSet1Solutions
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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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4/10/2015 CBSEClassXIISciencePhysicsBoardPaper2004AllIndiaSet1Solutions
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Whenadeuteronofmass2.0141uandnegligiblekineticenergyisabsorbedbyalithiumnucleusofmass6.0155u,thecompoundnucleusdisintegratesspontaneouslyintotwoalphaparticles,eachofmass4.0026u.Calculatetheenergyinjoulescarriedbyeachalphaparticle.(1u=1.661027kg)
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Q25
Whatismeantbyremotesensing?Brieflyexplainhowitiscarriedout.Mentionanytwoapplicationsofremotesensing.
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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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4/10/2015 CBSEClassXIISciencePhysicsBoardPaper2004AllIndiaSet1Solutions
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Completethepathofincidentrayoflight,showingtheformationofarealimage.Hencederivetherelationconnectingobjectdistanceu,imagedistanceR,andtherefractiveindicesn1andn2ofthetwomedia.Brieflyexplain,howthefocallengthofaconvexlenschanges,withincreaseinwavelengthofincidentlight.
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