Physics MCQs

Page No. 9

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


acollector

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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

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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

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dElectrons Ne

✖


View Answer Ne only

The metastable state for an atom in laser light is_____________?


a10-4 sec

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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

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bNormal state

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cInverted population

✓


d All the above

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View Answer Inverted population

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


aStimulated

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bAbsorbed

✓


cCause X-ray emission

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dCause laser production

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View Answer Absorbed

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