MATERIALS AND COMPONENTS QUIZ

Debye temperature of metals is

About 200 K

About 2 K

About 600 K

About 10 K

TRUE ANSWER : ?
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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 only

Electronic, ionic and permanent

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

High thermal conductivity and low melting point

Low thermal conductivity and low melting pointL

Low thermal conductivity and high melting point

High thermal conductivity and high melting point

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Which inductor is used at high frequencies?

Iron alloy cored

Cast iron cored

Sheet steel cored

Ceramic cored

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In a metal, the valence electrons

Are shared by all atoms

Are not shared

Are shared only between neighbouring atoms

Either B or C

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

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

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

The nucleus will not be shifted.

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

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Hall effect is observed in a specimen (metal or semi conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is

In a direction anti parallel to magnetic field

None of these

In the same direction as current

Normal to both current and magnetic field

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

True

False

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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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When a material is in superconducting state and a magnetic field is applied

The superconducting property is not affected

The superconducting property may be affected and resistivity may increase from zero to a low value

The superconducting property may be destroyed

The material may become an insulator

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