MATERIALS AND COMPONENTS QUIZ

On the basis of the type of chemical bonds, solids may be classified into

Ionic crystals, valence crystals, metal and vander wall crystals

Ionic and valence crystals

Ionic crystals

Ionic crystal, valence crystals and metals

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

Permittivity same as that of air

Low permittivity

High permittivity

Permittivity which is neither high nor low

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Above a certain temperature, the specific heat of a metal becomes constant. This temperature is called

Curie temperature

Neel temperature

Transition temperature

Debye temperature

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Nickel is a non-magnetic material.

False

True

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A vacant electronic state moves in the same direction as would a positive charge carrier.

False

True

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If the number of atoms per unit volume of a monoatomic gas changes, the dielectric constant still remains constant.

True

False

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The fact that domains exhibits spontaneous magnetisation is

Curie-Weiss law

Second hypothesis is of Weiss

First hypothesis is of Curie

Boltzmann’s statistics

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The unit for mmf is

Wb

V

A

T

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In solid insulator materials having only one kind of atom, the types of polarization which exist are

Electronic and ionic

Electronic, ionic and permanent

Electronic only

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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 more than 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

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