Physics
On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because:

cohesion of water is greater than its adhesion with glass.
cohesion of mercury is greater than its adhesion with glass.
mercury is a metal.
density of mercury is greater than that of water.

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

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