Physics
A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.

The mercury level starts falling
The mercury level does not change
The mercury level starts rising
The bell jar breaks up

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Physics
Pressure Cooker cooks faster because

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

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