AREA PROBLEMS QUIZ

Nickel is a non-magnetic material.

True

False

TRUE ANSWER : ?
YOUR ANSWER : ?

When a dielectric material is subjected to alternating field, the absorption of energy by the material from the field is given by the imaginary part of polarizability.

False

True

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In an intrinsic semiconductor, at a given temperature T

The number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination

The number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination

Any of the above

The number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination

TRUE ANSWER : ?
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The dielectric losses do not depend on frequency.

False

True

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Piezoelectricity means the slight change in dimensions of a specimen when an electric field is applied.

False

True

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Spontaneous magnetisation is characteristic of ferromagnetic materials.

False

True

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Electrical contact materials used in switches, brushes, relay must possess

Low thermal conductivity and low melting pointL

Low thermal conductivity and high melting point

High thermal conductivity and low melting point

High thermal conductivity and high melting point

TRUE ANSWER : ?
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A characteristic property of crystal is its periodicity of structure.

True

False

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For making a capacitor it is better to have a dielectric having

Low permittivity

High permittivity

Permittivity same as that of air

Permittivity which is neither high nor low

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The elements which become superconducting at extremely low temperatures are

Ferromagnetic at room temperature

Insulators at room temperature

Relatively poor conductors at room temperature

Good conductors at room temperature

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YOUR ANSWER : ?

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