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271. Forconfinementofelectroninaboxofradius1-14mtheelectron,speedshouldbe_____________?
A.17m/sec
B.Shouldbegreaterthanthespeedoflight.
C.Bezero
D.Notbewave-like
272. TheenergyradiatedisdirectlyproportionaltothefourthpowerofKelvinstemperatureis________________?
A.Karl-Weinslaw
B.Rayleigh-Jeanslaw
C.Stephenslaw
D.Plancks
273. Comptoneffectprovesthe________________?
A.Photontheoryoflight
B.Dualnatureoflight
C.Wavenatureoflight
D.Uncertainnatureoflight
274. Electronmovesintheorbitas________________?
A.Simplevibratorymotion
B.Standingwavemotion
C.Vibratorymotionlikeupanddown
D.S.H.Mlikesthesound
275. Alenswhichconvergesabeamofparallelraystoapointiscalled______________?
A.diverging(orconcave)lens
B.converging(orconvex)lens
C.planoconcavelens
D.planoconvexlens
276. Thediameterofalensiscalled________________?
A.focallength
B.principalaxis
C.aperture
D.radiusofcurvature
277. Unitofpowerofalensis________________?
A.meter
B.watt
C.diopter
D.horsepower
278. Thepowerofaconcavelensis_______________?
A.real
B.virtual
C.positive
D.negative
279. Ifanobjectisplacedawayfrom2fofaconverginglensthentheimagewillbe_______________?
A.realanderect
B.virtualanderect
C.realandinverted
D.virtual
280. Magnifyingpowerofsimplemicroscope______________?
A.increasewithincreaseinfocallength
B.increasewithdecreaseinfocallength
C.noeffectwithdecreaseorincreasewithfocallength
D.listdistanceofdistinctvision