Physics
The blue colour of water in the sea is due to

Reflection of blue sky by sea water
Reflection of blue light by impurities in sea water
Absorption of other colours except blue by water molecules
Scattering of blue light by water molecules

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Physics
The Hooke's law is valid for

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

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