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

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

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Physics
Scalar Quantities are

Physical quantities which have magnitude only and no direction
Physical quantities which have no magnitude and no direction
Physical quantities which have no magnitude only and only direction
Physical quantities which have magnitude only and direction

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