Physics
Heat is transmitted from higher temperature to lower temperature through the actual motion of the molecules in

Both conduction and convection
Radiation
Convection
Conduction

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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
The material of which pipes are made contracts due to cold and so breaks
None of these
Frost makes the pipes rusty, so they break

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