Physics
Transformer is a device to convert

Low voltage A.C. into high voltage A.C.
Low voltage D.C. into high voltage D.C.
C. to A.C.
Mechanical energy into Electrical energy

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Physics
Inside an aeroplane, flying at a high altitude,

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

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