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 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

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Physics
What is the principle of a ''Life Jacket"?

It increases the volume of the person to keep him afloat
The person can sit on it like a raft
It provides oxygen to a drowning person
It decreases the volume of the person to keep him afloat

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