Physics MCQs

Page No. 9

In n-p-n transistor, p works as______________?


acollector


bemitter


cbase


dany of above


View Answer base

p-n junction when reversed biased acts as a_______________?


acapacitor


binductor


con switch


doff switch


View Answer off switch

Semi-conductor germanium and silicon are_________________?


a pentavalent


b trivalent


cdivalent


dtetravalent


View Answer tetravalent

Electrons present in p-type material due to thermal pair generation are_____________?


amajority carriers


bminority carriers


cdual carriers


dblockers


View Answer minority carriers

The velocity of laser light is___________________?


aLess than ordinary light


bMore than ordinary light


cEqual to ordinary light


dDifferent for different colours or frequency



Reflecting mirrors in laser is used to______________?


aFurther stimulation


b Lasing more


cFor producing more energetic lasers


dAll


View Answer Further stimulation

In He-Ne laser the lasing action is produced by_______________?


aNe only


b He-Ne both


cElectrons of He


dElectrons Ne


View Answer Ne only

The metastable state for an atom in laser light is_____________?


a10-4 sec


b10-5 sec


c10-3 sec


d10-8 sec


View Answer 10-3 sec

In laser production the state in which more atoms are in the upper state than in the lower one is called_____________?


aMetal stable state


bNormal state


cInverted population


d All the above


View Answer Inverted population

In normal state of energy the incident high energy photons will be______________?


aStimulated


bAbsorbed


cCause X-ray emission


dCause laser production


View Answer Absorbed

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