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

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

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Physics
Ice is packed in saw dust because

Saw dust is poor conductor of heat.
Saw dust does not stick to the ice.
Saw dust is a good conductor of heat.
Saw dust will not get melted easily.

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