Physics
A spherical ball made of steel when dropped in mercury container

Will be on the surface of mercury
Will dissolve in mercury
Will be partly immersed mercury
Sink in mercury

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Physics
In the process of magnetisation of a bar

The entire bulk of the bar gets magnetised
Only some parts of the outer layers of the bar get magnetised
Only the ends of the bar get magnetised
Only the surface of the bar gets magnetised

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Physics
In a conductor

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

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