Start learning →

JKCET Kinetic Theory of Gases — practice questions — page 3

Explore 87 free Kinetic Theory of Gases questions in JKCET Physics. Open each question or exercise to read its content, reference answers and available explanation.

Practise Kinetic Theory of Gases with Quill →

Kinetic Theory of Gases questions and exercises with answers

Showing questions 61–87 of 87.

Kinetic energy per molecule of monatomic gas at 300 K (k = 1.38 × 10⁻²³):Read the answer and worked solution →Two containers, equal volume, one with H₂ and one with O₂ at same T, P. Ratio of:Read the answer and worked solution →For ideal gas, molar heat capacity C_v vs C_p relationship:Read the answer and worked solution →Speed of sound in ideal gas:Read the answer and worked solution →The ideal gas equationRead the answer and worked solution →Constants of the gas lawsRead the answer and worked solution →When real gases obey the equationRead the answer and worked solution →Pressure from molecular motionRead the answer and worked solution →Reading the pressure relationRead the answer and worked solution →What temperature measuresRead the answer and worked solution →Which moves fasterRead the answer and worked solution →Odd one out: kinetic theoryRead the answer and worked solution →Law of equipartitionRead the answer and worked solution →Equipartition, checkedRead the answer and worked solution →Mode to energyRead the answer and worked solution →Specific heats from equipartitionRead the answer and worked solution →Mean free pathRead the answer and worked solution →Free path and collisionsRead the answer and worked solution →Who proposed whatRead the answer and worked solution →Odd one out: the gas lawsRead the answer and worked solution →True of gasesRead the answer and worked solution →Forces between moleculesRead the answer and worked solution →Symbol to meaningRead the answer and worked solution →Translational kinetic energyRead the answer and worked solution →Odd one out: what changesRead the answer and worked solution →Modes and degrees of freedomRead the answer and worked solution →Kinetic theory, mixed checkRead the answer and worked solution →

Worked practice questions

Kinetic energy per molecule of monatomic gas at 300 K (k = 1.38 × 10⁻²³):

  1. kT
  2. 1 J
  3. 10⁻²⁰ J
  4. 6.2 × 10⁻²¹ J (= (3/2) × 1.38 × 10⁻²³ × 300)
Show answer and solution

Correct answer: D. 6.2 × 10⁻²¹ J (= (3/2) × 1.38 × 10⁻²³ × 300)

<KE> = (3/2)kT = 1.5 × 1.38 × 10⁻²³ × 300 = 6.21 × 10⁻²¹ J ≈ 0.0388 eV ≈ kT × 1.5. At room T, kT ≈ 1/40 eV.

Open this question →

Two containers, equal volume, one with H₂ and one with O₂ at same T, P. Ratio of:

  1. All ratios equal
  2. Random
  3. v_rms: 4:1 (H₂ faster); KE per molecule: 1:1 (same T)
  4. Cannot determine
Show answer and solution

Correct answer: C. v_rms: 4:1 (H₂ faster); KE per molecule: 1:1 (same T)

**At same T:** same average translational KE per molecule. But v_rms ∝ 1/sqrt(M). M(O₂)/M(H₂) = 32/2 = 16. v_rms(H₂)/v_rms(O₂) = sqrt(16) = 4. So H₂ molecules 4× faster but same KE.

Open this question →

For ideal gas, molar heat capacity C_v vs C_p relationship:

  1. Random
  2. Always C_v > C_p
  3. C_p/C_v = γ
  4. C_p > C_v and C_p = C_v + R
Show answer and solution

Correct answer: D. C_p > C_v and C_p = C_v + R

For all ideal gases: C_p = C_v + R, C_p > C_v, γ = C_p/C_v depends on DOF (monatomic 5/3, diatomic 7/5, etc.).

Open this question →

How to practise

  1. Choose a Kinetic Theory of Gases question and try to work out your answer.
  2. Open the question to check the correct answer and read its worked solution.
  3. Continue in the app for bite-sized lessons, explanations and review with Quill. You can start without creating an account.

More Physics topics

MagnetismWork and EnergyWork and PowerCurrent ElectricityElectromagnetismOpticsMagnetism and MatterMagnetism & EMI