Physics
Mist is caused by

Water vapour at low temperature
Dry ice
Carbon-monoxide in solid form
Ice at low temperature

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP