Physics
Mica is used in electrical appliances such as electric iron because mica is

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

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Physics
Ice is packed in saw dust because

Saw dust will not get melted easily.
Saw dust is poor conductor of heat.
Saw dust does not stick to the ice.
Saw dust is a good conductor of heat.

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