Physics
If a body moves with a constant speed in a circle

No force acts on it
No acceleration is produced in it
Its velocity remains constant
No work is done on it

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Physics
A white and smooth surface is

Bad absorber and bad reflector of heat
Good absorber and bad reflector of heat
Good absorber and good reflector of heat
Bad absorber and good reflector of heat

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

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