Physics
The apparent weight of a man in a lift is less the real weight when :

The lift is going down with uniform speed
The lift is going up with an acceleration
The lift is going up with uniform speed
The lift is going down with an acceleration

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Physics
Inside an aeroplane, flying at a high altitude,

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

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