Physics
When the Sun is near the horizon during the morning or evening, it appears reddish. The phenomenon that is responsible for this observation is

Reflection of light
Refraction of light
Scattering of light
Dispersion of light

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

The material of which pipes are made contracts due to cold and so breaks
Water in the pipes freezes and on freezing water expands, so pipes break
Frost makes the pipes rusty, so they break
None of these

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Physics
In a conductor

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

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