Physics
Inside an aeroplane, flying at a high altitude,

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

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Physics
In the process of magnetisation of a bar

Only the surface of the bar gets magnetised
The entire bulk of the bar gets magnetised
Only the ends of the bar get magnetised
Only some parts of the outer layers of the bar get magnetised

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