Physics MCQs

Page No. 8

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


ausing a transistor

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b suppressing the harmonics in A.C voltage

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csuppressing half wave of A.C supply by using diode

✓


dusing a Coolidge tube

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


aequal to emitter current

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bslightly less than emitter current

✓


cgreater than emitter curr any of aboveent

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d any of above

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


an

✓


bp

✖


cmix

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dany of above

✖


View Answer n

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


aThe switch

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b The light emitting diode

✓


cThe photo diodes

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dSolar cells.

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


aAn amplifier.

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b A rectifier

✓


cFiltering circuit

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d Converter.

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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.

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cIt has high resistance to the current flow when reverse biased

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dIts conductivity increases with rise of temperature.

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Thermions are________________?


aprotons

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b positrons

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celectrons

✓


dphotons

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View Answer electrons

Which one of the following has the greatest energy gap ?


a insulator

✓


bconductor

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csemi conductor

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dany of above

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View Answer insulator

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


a constant

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bzero

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cchanging

✓


dinfinite

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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

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

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dfree electrons in n-type and p-type

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