Materials and Components
Electrical contact materials used in switches, brushes, relay must possess

Low thermal conductivity and high melting point
High thermal conductivity and low melting point
Low thermal conductivity and low melting pointL
High thermal conductivity and high melting point

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

Is small as compared 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 almost equal to the number of valence electrons

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

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

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