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

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

ANSWER DOWNLOAD EXAMIANS APP

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

ANSWER DOWNLOAD EXAMIANS APP