Physics
Inside an aeroplane, flying at a high altitude,

normal humidity and partial vacuum are maintained.
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.

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Physics
Which of the following occurred first ?

Max Planck unveiled the Quantum Theory
Albert Einstein propounded the General Theory of Relativity
Guglielmo Marconi sent out the first wireless signals
Wright Brothers successfully flew an aircraft

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Physics
A balloon filled with hydrogen will

Reach a particular height and remain floating
Continue going upwards uninterrupted
Burst after reaching some height
Reach a particular height and start coming down

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