Physics
The apparent weight of a man in a lift is less the real weight when :

The lift is going down with uniform speed
The lift is going up with uniform speed
The lift is going up with an acceleration
The lift is going down with an acceleration

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Physics
Pressure Cooker cooks faster because

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

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