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

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

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Physics
Stationary wave is formed by

Two waves of same frequency travelling in the opposite direction
Two waves of same frequency travelling in the same direction
A transverse wave superposing a longitudinal wave
Two waves of the same speed superposing

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