MATERIALS AND COMPONENTS QUIZ

The elements which become superconducting at extremely low temperatures are

Insulators at room temperature

Good conductors at room temperature

Relatively poor conductors at room temperature

Ferromagnetic at room temperature

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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 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 a direction opposite to that of E.

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Schrodinger wave equation is a

Partial differential equation

Differential equation

Linear equation

None of these

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The number of protons in a silicon atom are

12

14

8

4

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As the atoms of rare gases become larger, electronic polarizability

Decreases

Increases

Remains the same

May increase or decrease

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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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The residual resistivity of a binary alloy at 0 K is

Dependent on the concentration of minor component in the alloy

Difference of residual resistivities of component metals

Sum of residual resistivities of component metals

Product of residual resistivities of component metals

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The resistance of a photoconductor

Increases with increase in light intensity

May increase or decrease with increase in light intensity

Decreases with increase in light intensity

Remains constant

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The dielectric losses do not depend on frequency.

False

True

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

High thermal conductivity and high melting point

Low thermal conductivity and low melting pointL

Low thermal conductivity and high melting point

High thermal conductivity and low melting point

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