Physics
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

at a place in a valley below sea level
at the top of Mt. Everest
in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
at sea level

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Physics
Pressure Cooker cooks faster because

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

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Physics
On a cold day when the room temperature is 15°C, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15°C, because :

Plastics have a higher thermal conductivity than metals
Metals are good conductors of heat
Plastics have a lower density than metals
Metals have higher thermal capacity than plastics

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