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

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

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Physics
What is a compound microscope?

A microscope whose lenses are concave.
A microscope whose lenses are convex.
A microscope that has two sets of lenses : an occular lens and an eyepiece.
A microscope that has one lens.

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