Physics
It is easier for a man to swim in sea water, than in river water because

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

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Physics
A dynamo is used to convert

Electrical energy into mechanical energy
Mechanical energy into electrical energy
Magnetic energy into mechanical energy
Electrical energy into magnetic energy

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