Physics
Inside an aeroplane, flying at a high altitude,

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

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Physics
A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because

The carpet is a better conductor of heat than the stone
The human body maintains a constant temperature
The stone conveys the heat away from the feet more rapidly than the carpet
The floor and carpet are at different temperatures

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