Physics
A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole ?

Dacrease
Will increase first and then dcrease
Remain constant
Increase

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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 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

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