Physics
The Hooke's law is valid for

Entire stress strain curve
Only proportional region of the stress strain curve
Elastic as well as plastic region of the stress strain curve
Entire elastic region of the stress strain curve

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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
at sea level
in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level

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