Physics
Alcohol is more volatile than water because ________ is lower than water.

Its boiling point
Its surface tension
Its density
Its viscosity

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

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