Physics
Sun appears red in colour at sunrise and sunset due to

That all other colours scatter away except red
That sun comes out of the mountains
Red light having longer wave length scatters away
The fact that sun emits only red colour at that time

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

None of these
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

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