Physics
A voltaic cell converts chemical energy to

Electrical energy
Mechanical energy
Light energy
Heat energy

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Physics
X-rays region lies between

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

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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 inside is less than the pressure outside.
normal humidity and partial vacuum are maintained.
the pressure is the same as that outside.

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