Physics
In a refrigerator what produces the cooling ?

The evaporation of a volatile liquid
None of these
The sudden expansion of a compressed gas
The ice which deposits on the freezer

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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
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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