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

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

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Physics
Stationary wave is formed by

Two waves of same frequency travelling in the same direction
Two waves of the same speed superposing
Two waves of same frequency travelling in the opposite direction
A transverse wave superposing a longitudinal wave

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