Physics
A nuclear reactor is said to have become 'critical' when

It is shut down to avoid explosion
It stops due to malfunctioning
It starts emitting dangerous radioactive radiations
It is ready to produce controlled energy

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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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