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

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

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Physics
Mirage is due to:

Depletion of ozone layer in the atmosphere
Equal heating of different parts of the atmosphere
Magnetic disturbances in the atmosphere
Unequal heating of different parts of the atmosphere

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