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
A standing wave occurs when

Two waves overlap
The amplitude of a wave exceeds its wavelength
A wave reflects upon itself
The speed of the wave is zero or near zero

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Physics
Conservation of energy refers to the fact that

The entropy of the universe is always increasing
If you conserve energy you will not be as tired
Energy cannot be created or destroyed but can be converted from one form to another
No chemical reaction is 100 percent efficient

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