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

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

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Physics
For an ideal gas, which one of the following statements does not hold true?

The speed of all gas molecules is same
There is no interactive force between the molecules.
The potential energy of the gas molecules is zero
The kinetic energies of all gas molecules are not same

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