Physics
In a conductor

There is no conduction band
The valence band and the conduction band overlap each other
The forbidden energy gap is very wide
The forbidden energy gap is very narrow

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Physics
The velocity of sound in air

Decreases with increase of temperature
Decreases with decrease of temperature
Increases with decrease of temperature
Does not depend on temperature

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Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

plastics have a higher thermal conductivity than metals
plastics have a lower density than metals
metals have higher thermal capacity than plastics
metals are good conductor of heat

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