Physics
Which one among the following components is used as an amplifying device?

Diode
Transformer
Capacitor
Transistor

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Physics
A transformer

Converts AC voltage to D.C. voltage
Is used to decrease or increase AC voltage
Converts electrical energy into mechanical energy
Converts DC to AC

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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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