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

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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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