Physics
According to special theory of relativity the mass of a particle

Decreases with increase in velocity.
Is independent of its velocity.
Decreases with decrease in velocity.
Increases with increase in velocity with respect to an observer.

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

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

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