Physics
The average kinetic energy of the molecules of an ideal gas is directly proportional to

Absolute temperature of the gas
Velocity of Molecules
Mass of Molecules
Temperature of environment

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Physics
In the process of magnetisation of a bar

Only the ends of the bar get magnetised
Only some parts of the outer layers of the bar get magnetised
Only the surface of the bar gets magnetised
The entire bulk of the bar gets magnetised

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