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

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
The sea is wider than the river

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Physics
X-rays region lies between

Ultraviolet and visible region
Gamma-rays and ultraviolet region
Visible and infra-red region
Short radio waves and long radio waves

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