Physics
Why does ice covered in sawdust not melt quickly ?

Sawdust is good conductor of heat
Sawdust does not allow the air to touch the ice
Sawdust is a bad conductor of heat
The water is absorbed by sawdust

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Physics
Pressure Cooker cooks faster because

It cooks the food at low pressure
Boiling point decreases with rise of pressure
Higher temperature is attained for cooking
The material of the cooker is a good conductor

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