Physics
Rainbow is due to

diffusion of sunlight through water droplets
ionisation of water deposits
refraction and reflection of sunlight by water droplets
absorption of sunlight in minute water droplets

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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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