Physics
The word ''insolation' means

None of these
Incoming solar radiation
Insoluble matters
Matters which insulate

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

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

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Physics
A hydrogen balloon floats up because of

Weight of the balloon is less than the weight of air displaced by it.
Air pressure decreases with decrease in weight
Air pressure decreases with decrease in height
The pressure inside the balloon is more than the pressure outside it

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