ANURAG TYAGI CLASSES RANKERS TEST SERIES

1. ANURAGTYAGICLASSES,16910DVASUNDHRA,GZB.
callus@9818777622/www.anuragtyagiclasses.org
Rankerstestseriestestno.4
PhysicsClass12
SectionA(objectivetypequestions)
1AnelectronmovingalongalinePQwhichliesinthesameplaneasacircularloopofconductingwire
asshowninfigure.Whatwillbethedirectionoftheinducedcurrentintheloop
a)anticlockwise b)clockwise c)alternatingd)nocurrentwillbeinduced
2.Eddycurrentareproducedwhen
a)ametaliskeptinvaryingmagneticfield b)ametaliskeptinstudymagneticfield
c)acircularcoilisplacedinamagneticfield d)throughacircularcoilcurrentispassed
3.Aconductoroflength0.4mismovingwithaspeedof7metrepersecondperpendiculartoa
magneticfieldofintensity0.9Wb/m²squarepointtheinducedemfacrosstheconductor
a)1.26V b)2.5Vc)5.04V.d)25.2V
4.TheinductancebetweenAandDis
a)3.66Hb)9Hc)0.66H.d)1H
5.Fleming'sleftandrighthandrulesareusedin
a)DCmotorandACgenerator. b)DCgeneratorandACmotor
c)DCmotorandDCgenerator d)bothrulesaresame,anyonecanbeused
6.AbulbandacapacitorareconnectedinseriestoasourceofAC.Ifitsfrequencyisincreased,while
keepingthevoltageofthesourceconstant,thenbulbwill
a)givemoreintenselight b)givelessintenselight
c)givelightofsameintensitybefore d)stopradiatinglight
7.WhichoneofthefollowingcurvesrepresentthevariationofImpedance(Z)withfrequencyfinseries
LCRcircuit?
8.Allcomponentsoftheelectromagnetic
spectruminvacumehave

2. ANURAGTYAGICLASSES,16910DVASUNDHRA,GZB.
callus@9818777622/www.anuragtyagiclasses.org
a)sameenergy b)velocity c)wavelength d)frequency
9.Whichoneofthefollowingarenotelectromagneticwaves
a)CosmicRays b)GammaRays c)βrays d)Xrays
10.Theelectromagneticradiationsusedinfoodprocessingsterilizingagentis
a)microwave b)UVrays c)Gamarays d)radiowaves
Section-B(subjectivetypequestions)
1.Givethedirectioninwhichtheinducedcurrentflowinthecoil
mountedonaninsulatingstandwhenabarmagnetisquicklymoved
alongtheaxisofthecoilfromonesidetotheotherasshowninthe
figure.
2.Showdiagrammaticallywhenismagneticfluxtakenaspositiveandnegative.
3.Define1Henry.
4.Whatistheorigenofdisplacementcurrent?
5.Longdistanceradiobroadcastuseshortwavebands,why?
6.Findthewavelengthofelectromagneticwavesoffrequency6x10¹²Hzinfreespace.Giveitstwo
applications.
7.Aradiocantuneintoanystationin7.5Hzto12MHz.Whatisthecorrespondingwavelengthband?
8.Explainbrieflyhowelectromagneticwavesareproducedbyanoscillating
charge.Howisthefrequencyofemwavesproducedrelatedtothatof
oscillatingcharge?
9.Inthegivendiagram,acoilBisconnectedtolowvoltagebulbLandand
placedparalleltoanothercoilAasshown.Explainthefollowingobservationsa)bulblightsandb)bulb
getsdimmerifthecoilbmovesupward.
10.Bothalternatingcurrentanddirectcurrentaremeasuredinamperes.Buthowistheamperedefined
foranalternatingcurrent?
11.DrawaschematicdiagramofasetupTransformer.Explainitsworkingprinciple.Deducethe
expressionforthesecondarytoprimaryvoltageintermsofthenumberofturnsinthetwocoilinan
idealTransformer.Howistheratiorelatedtothecurrentsinthetwocoils?