Materials and Components
The resistance of a photoconductor

Remains constant
Decreases with increase in light intensity
May increase or decrease with increase in light intensity
Increases with increase in light intensity

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

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

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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 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.
The nucleus will be shifted in the direction of E by an amount which is proportional to E.
The nucleus will not be shifted.

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