Materials and Components - ECE Questions and Answers

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If the operating temperature increases by 10°C, the rate of deterioration of solid dielectric becomes

double

one and a half time

3 times

4 times

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In which of the following semiconductor are holes minority carriers

extrinsic

p type

n type

intrinsic

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At 0 K, silicon and germanium behave like monoatomic crystals.

True

False

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Assertion (A): Acceptor extrinsic semiconductor has higher conductivity than intrinsic semiconductor.

Reason (R): Addition of p-type impurity produces an allowable discrete energy level just above valence band.

Both A and R are true and R is correct explanation of A

Both A and R are true but R is not correct explanation of A

A is true but R is false

A is false but R is true

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Soft iron is suitable for making temporary magnets.

True

False

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Antiferromagnetic materials do not have permanent dipoles.

True

False

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The Ohm's law for conduction in metals is

J = σE

J =

J ∝ σE

J ∝

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The measurement of Hall coefficient of a semiconductor with one type of charge carriers gives the information about

sign of charge carrier

density of charge carrier

both sign and density of charge carrier

none of the above

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∈₀ has no other physical meaning than that of a fundamental conversion factor.

True

False