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

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

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Physics
Absolute Zero is defined as

The temperature at which all molecular motion ceases
At which liquid Helium boils
At which the volume becomes zero
At which water boils at 298K

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Physics
The sky appears blue because

It is actually blue
All colours interfere to produce blue
In white light, the blue component dominates
The atmosphere scatters blue colour more than the others

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