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

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Physics
The sensation of weightlessness in a spacecraft in an orbit is due to the

Fact that spacecraft in the orbit has no energy
Presence of gravity outside but not inside the spacecraft
Absence of gravity outside
Acceleration in the orbit which is equal to the acceleration due to gravity outside

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Physics
Mirage is due to:

Depletion of ozone layer in the atmosphere
Unequal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere
Equal heating of different parts of the atmosphere

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