Materials and Components - ECE Questions and Answers

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A magnet does not attract

nickel

iron

copper

iron and copper

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Bitter powder patterns prove the existence of domains.

True

False

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Assertion (A): An amorphous material is obtained when mobility of atoms is inhibited during solidification.

Reason (R): Crystalline state is a natural state for most solids.

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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An air cored inductance is a

linear circuit element because its reactance varies linearly with voltage at a fixed frequency

linear circuit element because its current varies linearly with voltage at a fixed frequency

nonlinear circuit element due to saturation of core

nonlinear circuit element because v =

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The number of turns in a coil is doubled. If initial time constant is T, the new time constant is

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When a trivalent impurity is added, the semiconductor becomes

p type

n type

intrinsic

neutral

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Iron has a body centred cubic structure.

True

False

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The units of polarization of dielectric are

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When a potential is applied across an intrinsic semiconductor, holes flow

towards positive terminal

away from positive terminal

in the external circuit only

none of the above