Physics
Pressure Cooker cooks faster because

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

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Physics
Stationary wave is formed by

Two waves of same frequency travelling in the opposite direction
Two waves of the same speed superposing
Two waves of same frequency travelling in the same direction
A transverse wave superposing a longitudinal wave

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