Physics
The light rays used for eliminating bacteria

X-rays
Infrared rays
Microwave radiation
Ultra-violet radiation

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Physics
It is easier for a man to swim in sea water, than in river water because

The density of sea water is more than the density of river water
The sea is-deeper than the river
The density of sea water is lesser than the density of river water
The sea is wider than the river

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

None of these
Frost makes the pipes rusty, so they break
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

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