Physics
Which electromagnetic radiation is used for satellite communication ?

Infrared
Millimeter wave
Ultraviolet
Radiowave

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

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Physics
Planets are

non-luminous heavenly bodies
luminous heavenly bodies that do not twinkle
luminous heavenly bodies revolving around a star
luminous heavenly bodies that twinkle

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