Physics
A body absorbs heat most if it is

Black and smooth
Black and rough
White and rough
White and smooth

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

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

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