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

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Physics
X-rays region lies between

Visible and infra-red region
Ultraviolet and visible region
Short radio waves and long radio waves
Gamma-rays and ultraviolet region

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