Physics
Pressure Cooker cooks faster because

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

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Physics
The wall of a dam is broader at the base

To withstand pressure that increases in a horizontal plane
To withstand pressure that is increased with atmospheric pressure
Because streamlining is required
To withstand pressure that increases with depth

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