Physics
Vegetables are cooked in lesser time by adding a pinch of salt while cooking because

Latent heat of vaporization of water decreases
Boiling point of water decreases
Latent heat of vaporization of water increases
Boiling point of water increases

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

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