Physics
The apparent weight of a man in a lift is less the real weight when :

The lift is going up with an acceleration
The lift is going down with an acceleration
The lift is going down with uniform speed
The lift is going up with uniform speed

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Physics
In a conductor

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

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