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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Physics
Solids have definite shapes.This is because

The forces of adhesion are large
The forces of adhesion are less
The forces of cohesion of the molecules within are very much less in them
The forces of cohesion are very large

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