Physics
Inside an aeroplane, flying at a high altitude,

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

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Physics
X-rays region lies between

Visible and infra-red region
Gamma-rays and ultraviolet region
Ultraviolet and visible region
Short radio waves and long radio waves

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