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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceOtherMediumConceptual

JEE Main 27 July 2022, Shift 2, Physics Q39

Question 39 of 90 in this shift, Physics question 9 of 30, Section A.

Which statements are correct about degrees of freedom ? (A) A molecule with n degrees of freedom has n2^2 different ways of storing energy. (B) Each degree of freedom is associated with 12\frac{1}{2} RT average energy per mole. (C) A monatomic gas molecule has 1 rotational degree of freedom where as diatomic molecule has 2 rotational degrees of freedom. (D) CH4_4 has a total of 6 degrees of freedom. Choose the correct answer from the options given below :
  1. (1)(B) and (C) only
  2. (2)(B) and (D) onlyOfficial answer
  3. (3)(A) and (B) only
  4. (4)(C) and (D) only

Official answer

Option 2

NTA final key.

Chapter
Kinetic Theory
Topic
Kinetic Theory of Gases
Idea tested
Degrees of Freedom

Same idea in other shifts

Asked 4× in all
  1. 4 Apr 2024, Shift 2 · Q40The translational degrees of freedom (ftf_t) and rotational degrees of freedom (frf_r) of CH4CH_4 molecule are:EasySingle correct
  2. 10 Apr 2023, Shift 1 · Q32Match List I with List II : List I List II (A) 3 Translational degrees of freedom (I) Monoatomic gases (B) 3 Translational, 2 rotational…EasyMatch the list
  3. 28 Jun 2022, Shift 1 · Q58The total internal energy of two mole monoatomic ideal gas at temperature T = 300 K will be ___________ J. (Given R = 8.31 J/mol.K)EasyNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.