\(\mathrm{N}\) molecules each of mass \(\mathrm{m}\) of gas \(\mathrm{A}\) and \(2 \mathrm{~N}\) molecules each of mass \(2 \mathrm{~m}\) of gas \(\mathrm{B}\) are contained in a vessel which is maintained at temperature \(T\). The mean square velocity of the molecules of gas B is denoted by \(V_2^2\) and the mean square of the \(\mathrm{X}\)-component velocity of the molecules of gas \(A\) is denoted by \(V_1^2\), then \(\frac{V_1}{V_2}\) is

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.