Kinetic Theory of Gases · JEE Main previous year questions

2019 2 questions

1. Q582019 · 9 Apr 2019 · Shift 1

   For a given gas at 1 atm pressure, rms speed of the molecule is 200 m/s at 127°C. At 2 atm pressure and at 227°C, the rms speed of the molecules will be :

   1. A.100 m/s
   2. B.$100\sqrt{5}$ m/s
   3. C.$80\sqrt{5}$ m/s
   4. D.80 m/s
   Show answer

   Answer: B

2. Q312019 · 9 Jan 2019 · Shift 1

   A mixture of 2 moles of helium gas (atomic mass = $4\text{ u}$), and 1 mole of argon gas (atomic mass = $40\text{ u}$) is kept at $300\text{ K}$ in a container. The ratio of their rms speeds $\left[\frac{V_{\mathrm{rms}}(\text{helium})}{V_{\mathrm{rms}}(\text{argon})}\right]$, is close to :

   1. A.3.16
   2. B.0.32
   3. C.0.45
   4. D.2.24
   Show answer

   Answer: A