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

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

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Physics
Mirage is due to:

Depletion of ozone layer in the atmosphere
Equal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere
Unequal heating of different parts of the atmosphere

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