Physics
When a bottle of perfume is opened in one corner of a room the smell spreads soon throughout the room. This is an example of

Viscosity
Diffusion
Surface tension
Capillarity

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

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