Physics
Inside an aeroplane, flying at a high altitude,

the pressure inside is less than the pressure outside.
normal humidity and partial vacuum are maintained.
normal atmospheric pressure is maintained by the use of air pumps.
the pressure is the same as that outside.

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Physics
The Hooke's law is valid for

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

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