IIT JEE Advanced 2011 Paper 1

Collisions of gas molecules are perfectly elastic which means that the total energy of the molecules before and after the collision remains the same.
Heavier particles transfer more momentum because momentum depends on the mass.
Only a small number of molecules possess very high velocity.
Particles of gas move in all possible directions in straight lines.
The distribution of speed remains constant at a particular temperature.
Hence, all the given statements are correct.