Physics
For an ideal gas, which one of the following statements does not hold true?

The speed of all gas molecules is same
There is no interactive force between the molecules.
The kinetic energies of all gas molecules are not same
The potential energy of the gas molecules is zero

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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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