Physics
A drop of liquid assumes spherical shape because:

A sphere has the largest surface area for a given volume
Inter molecular forces are weak in liquids
A sphere has the least surface area for a given volume
Intermolecular forces are strong in liquids

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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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