Physics
Inside an aeroplane, flying at a high altitude,

the pressure is the same as that outside.
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.

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Physics
Why does bleeding occur through the nose in high mountainous regions ?

The pressure of blood in capillaries is greater than the outside pressure
The blood pressure fluctuates and finally decreases drastically
The blood pressure of a person increases at high altitudes
The pressure at high altitudes is greater than that on the plains

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