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
None of these
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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Physics
We always see the same face of the moon, because

It is smaller than the earth
It rotates at the same speed as the earth around the sun
It takes equal time for revolution around the earth and rotation on its own axis
It revolves on its axis in adirection opposite to that ofthe earth

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