Physics
At boiling point of liquids, its

Temperature remains constant
Temperature increases
Vapour pressure decreases
Atmospheric pressure increases

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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
Water in the pipes freezes and on freezing water expands, so pipes break
None of these
Frost makes the pipes rusty, so they break

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