Physics
What is the unit of the physical quantity Entropy?

Newton per kelvin
Joule per kelvin
Pascal per kelvin
Watt per kelvin

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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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