Physics
The velocity of falling rain drops attains a terminal value because of

Surface tension
Viscous force exerted by air
Upward thrust due to air
Air current

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

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