List of top Physics Questions on Kinetic molecular theory of gases asked in Haryana PMT

The root mean square velocity of the molecules in a sample of helium is $ \frac{5}{7} $ th that of the molecules in a simple of hydrogen. If the temperature of hydrogen sample is $ 0^{\circ} C $ then that of helium sample is about

If average velocity becomes $4$ times then what will be the effect on rms velocity at that temperature?