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

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

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Physics
Planets do not twinkle because

They are nearer to earth and hence we receive a greater amount of light.
Their distance from the earth does not change with time
They are very far away from the earth resulting in decrease in intensity of light
They emit light of a constant intensity

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