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 sea is wider than the river
The density of sea water is more than the density of river water

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Physics
The Hooke's law is valid for

Entire stress strain curve
Elastic as well as plastic region of the stress strain curve
Only proportional region of the stress strain curve
Entire elastic region of the stress strain curve

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