Physics
Air coolers are more suitable for

Hot and humid climate
Cool and humid climate
Hot and dry climate
Cool and dry climate

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

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

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