Physics
Transformer is a device to convert

Low voltage A.C. into high voltage A.C.
Low voltage D.C. into high voltage D.C.
C. to A.C.
Mechanical 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:

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

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