MATERIALS AND COMPONENTS QUIZ

Which inductor is used at high frequencies?

Iron alloy cored

Cast iron cored

Ceramic cored

Sheet steel cored

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At room temperature the number of conducting electrons in an intrinsic semiconductor

Is almost equal to the number of valence electrons

Is a very small fraction of the number of valence electrons

Is about half the number of valence electrons

Is small as compared to the number of valence electrons

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In an intrinsic semiconductor, at a given temperature T

Any of the above

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

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

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The dielectric losses do not depend on frequency.

False

True

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Which of the following are true for relative dielectric constant?1. It is dimensionless.2. It is equal to 1 for vacuum.3. It is equal to 1 for all substances.

1 and 2 only

2 and 3 only

1 and 3 only

1, 2 and 3

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

Ionic crystal, valence crystals and metals

Ionic crystals, valence crystals, metal and vander wall crystals

Ionic crystals

Ionic and valence crystals

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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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An atom of a rare gas is placed is an electric field E. Then

The nucleus will not be shifted.

The nucleus will be shifted in the direction of E by an amount which is independent of E.

The nucleus will be shifted in the direction of E by an amount which is proportional to E.

The nucleus will be shifted in a direction opposite to that of E.

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Many compounds also exhibit semiconducting properties.

False

True

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In van der walls crystals, there exists a high degree of stability of the outer electron shell.

False

True

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