Physics
Dynamo is a device for converting

Magnetic energy into electrical energy
Mechanical energy into electrical energy
Heat energy into electrical energy
Chemical energy into electrical energy

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Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

cohesion of water is greater than its adhesion with glass.
cohesion of mercury is greater than its adhesion with glass.
density of mercury is greater than that of water.
mercury is a metal.

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