Physics MCQs

Page No. 8

The simplest type of rectification known as half wave rectification is obtained by____________________?


ausing a transistor


b suppressing the harmonics in A.C voltage


csuppressing half wave of A.C supply by using diode


dusing a Coolidge tube



In p-n-p transistor the collector current is________________?equal to emitter current


aequal to emitter current


bslightly less than emitter current


cgreater than emitter curr any of aboveent


d any of above



Semi-conductors with donor atoms and free electrons belong to the type________________?


an


bp


cmix


dany of above


View Answer n

The especially designed semiconductor diodes used as indicator lamps in electronic circuits are___________?


aThe switch


b The light emitting diode


cThe photo diodes


dSolar cells.



The device or circuit used for conversion of A.C. into D.C. is called_______________?


aAn amplifier.


b A rectifier


cFiltering circuit


d Converter.


View Answer A rectifier

The semiconductor diode can be used as a rectifier because _______________?


aIt has low resistance to the current flow when forward biased & high resistance when reverse biased.


b It has low resistance to the current flow when forward biased.


cIt has high resistance to the current flow when reverse biased


dIts conductivity increases with rise of temperature.



Thermions are________________?


aprotons


b positrons


celectrons


dphotons


View Answer electrons

Which one of the following has the greatest energy gap ?


a insulator


bconductor


csemi conductor


dany of above


View Answer insulator

The velocity of an oscillating charge as it moves to and fro along a wire is always_____________?


a constant


bzero


cchanging


dinfinite


View Answer changing

Identify the correct statement about minority carriers_____________?


aholes in n-type and free electrons in p-type


b holes in n-type and p-type


cfree electrons in n-type and holes in p-type


dfree electrons in n-type and p-type



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