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Friday, 9 October

JEE Main 2023 · PhysicsMultiple choiceAssertion–reasonEasyConceptual

JEE Main 6 April 2023, Shift 1, Physics Q49

Question 49 of 90 in this shift, Physics question 19 of 30, Section A.

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Earth has atmosphere whereas moon doesn't have any atmosphere. Reason R : The escape velocity on moon is very small as compared to that on earth. In the light of the above statements, choose the correct answer from the options given below:
  1. (1)Both A and R are correct and R is the correct explanation of AOfficial answer
  2. (2)Both A and R are correct but R is NOT the correct explanation of A
  3. (3)A is true but R is false
  4. (4)A is false but R is true

Official answer

Option 1

NTA final key.

Chapter
Gravitation
Topic
Kinetic Theory of Gases
Idea tested
Planetary Atmosphere Retention

Same topic in other shifts

All Kinetic Theory of Gases questions
  1. 4 Apr 2026, Shift 2 · Q33Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: If the average kinetic…EasyAssertion–reason
  2. 5 Apr 2026, Shift 1 · Q32Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Statement I: Change in internal…MediumTwo statements
  3. 2 Apr 2025, Shift 1 · Q48γA\gamma_A is the specific heat ratio of monoatomic gas A having 3 translational degrees of freedom. γB\gamma_B is the specific heat ratio…MediumNumerical value
  4. 2 Apr 2025, Shift 2 · Q50The internal energy of air in 4 m×4 m×3 m4\ \mathrm{m}\times4\ \mathrm{m}\times3\ \mathrm{m} sized room at 1 atmospheric pressure will be…EasyNumerical value
  5. 7 Apr 2025, Shift 1 · Q33Match the LIST-I with LIST-I LIST-I | LIST-II A. Triatomic rigid gas | I. CpCv=53\frac{C_p}{C_v} = \frac{5}{3} B. Diatomic non-rigid gas | II.…MediumMatch the list
  6. 7 Apr 2025, Shift 2 · Q33The helium and argon are put in the flask at the same room temperature (300 K). The ratio of average kinetic energies (per molecule) of…EasySingle correct

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 42 of the 174 JEE Main shifts held from 2017 to 2026.