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JEE Main 2025 January Physics: Kinetic Theory of Gases – Previous Year Questions

All 5 questions asked from Kinetic Theory of Gases in JEE Main 2025 January Physics (22, 23, 24, 28 and 29 January, all shifts). This chapter is about 2.0% of the 250 Physics questions in the session: 4 single-correct (MCQ) and 1 numerical-value questions. Select an answer to attempt each question, and open “View solution” under it.

5questions
4MCQ
1numerical
2.0%of Physics paper

Topics asked in this chapter

  • Kinetic Theory of Gases – 4 questions
  • Specific Heats & Degrees of Freedom – 1 question

Kinetic Theory of Gases

Q128 Jan 2025 · Shift 1MCQ
For a particular ideal gas which of the following graphs represents the variation of mean squared velocity of the gas molecules with temperature?
  1. A
    Figure for the question
  2. B
    Figure for the question
  3. C
    Figure for the question
  4. D
    Figure for the question
Q228 Jan 2025 · Shift 2MCQ
The ratio of vapour densities of two gases at the same temperature is $\frac{4}{25}$, then the ratio of r.m.s. velocities will be :
  1. A
    $\frac{25}{4}$
  2. B
    $\frac{5}{2}$
  3. C
    $\frac{4}{25}$
  4. D
    $\frac{2}{5}$
Q328 Jan 2025 · Shift 2MCQ
The kinetic energy of translation of the molecules in 50 g of $\mathrm{CO_{2}}$ gas at $17^\circ$C is
  1. A
    3986.3 J
  2. B
    3582.7 J
  3. C
    4102.8 J
  4. D
    4205.5 J
Q429 Jan 2025 · Shift 1Numerical
A container of fixed volume contains a gas at $27^\circ$C. To double the pressure of the gas, the temperature of gas should be raised to $^\circ$C.

Specific Heats & Degrees of Freedom

Q522 Jan 2025 · Shift 2MCQ
For a diatomic gas, if $\gamma_1 = \left(\frac{C_p}{C_v}\right)$ for rigid molecules and $\gamma_2 = \left(\frac{C_p}{C_v}\right)$ for another diatomic molecules, but also having vibrational modes. Then, which one of the following options is correct ? ($C_p$ and $C_v$ are specific heats of the gas at constant pressure and volume)
  1. A
    $\gamma_2 = \gamma_1$
  2. B
    $2\gamma_2 = \gamma_1$
  3. C
    $\gamma_2 < \gamma_1$
  4. D
    $\gamma_2 > \gamma_1$
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