JEE Main Kinetic Theory of Gases — practice questions — page 2

Explore 32 free Kinetic Theory of Gases questions in JEE Main Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Kinetic Theory of Gases questions and exercises with answers

Showing questions 31–32 of 32.

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 →

Worked practice questions

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

Random
Always C_v > C_p
C_p/C_v = γ
C_p > C_v and C_p = C_v + R

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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.).

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Speed of sound in ideal gas:

cV
sqrt(RT/M)
v_sound = sqrt(γRT/M)
sqrt(kT)

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Correct answer: C. v_sound = sqrt(γRT/M)

v_sound = sqrt(γP/ρ) = sqrt(γRT/M). For air (γ=1.4, M=29 g/mol) at 300 K: ≈ 346 m/s. Speed of sound ≈ 70% of v_rms. Sound is a pressure wave whose propagation speed depends on γ.

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