Physics
Hot water is poured simultaneously in four metallic tumblers painted outside with different points. After some time the water will be found to have cooled most in the tumbler painted.

Shining white
Shining black
Rough white
Rough black

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

Frost makes the pipes rusty, so they break
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

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