Physics
In a conductor

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

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Physics
In a railway track, two rails are joined end to end with a gap in between them because

Steel can be saved
Accidents due to expansion in summer can be avoided
Air-gaps are necessary for bearing the weight of running train
Accidents due to contraction in winter can be avoided

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

density of mercury is greater than that of water.
mercury is a metal.
cohesion of mercury is greater than its adhesion with glass.
cohesion of water is greater than its adhesion with glass.

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