Physics
Transformer is a device to convert

Low voltage D.C. into high voltage D.C.
Mechanical energy into Electrical energy
Low voltage A.C. into high voltage A.C.
C. to A.C.

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Physics
Mica is used in electrical appliances such as electric iron because mica is

a bad conductor of heat but a good conductor of electricity
a good conductor of heat but a bad conductor of electricity
a bad conductor of heat as well as electricity
a good conductor of heat as well as electricity

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Physics
Hydro-electric power is a:

Renewable natural resource
Neither renewable nor non renewable resource
A mixture of renewable and non-renewable natural resource
non-renewable natural resource

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