Physics
The density of a gas is maximum at

Low temperature, low pressure
Low temperature, high pressure
High temperature, low pressure
High temperature, high pressure

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

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