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Friday, 9 October

NEET UG 2018 · Physics · Question 3

NEET 2018 Physics, question 3

Question 3 of the NEET 2018 paper (code AA) is a Physics question from Kinetic Theory. Its idea, RMS Speed of Molecules, was asked twice, in 2018 and 2023, across NEET 2017–2026. The CBSE official answer key gives option 2.

Updated 2026-10-08

Q3 · Physics

At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth's atmosphere ?

(Given :

Mass of oxygen molecule (m) = 2.76×10−262.76\times10^{-26} kg

Boltzmann's constant kB=1.38×10−23k_B = 1.38\times10^{-23} J K−1^{-1})

  1. 15.016×1045.016\times10^{4} K
  2. 28.360×1048.360\times10^{4} KOfficial answer
  3. 32.508×1042.508\times10^{4} K
  4. 41.254×1041.254\times10^{4} K

Official answer: option 2 · CBSE official answer key

Same idea

RMS Speed of Molecules, in other papers

NEET asked this idea twice, in 2018 and 2023. The other question below.

  • 2023 Q12The temperature of a gas is −50° C. To what temperature the gas should be heated so that the rms speed is increased by 3 times?Numerical · Medium

RMS Speed of Molecules: every question and how it was framed

The chapter

Kinetic Theory in ten years of NEET

14 questions from 2017–2026, asked in 10 of 10 papers, about 1.4 a paper. Kinetic Theory of Gases alone had 14.

Chapter analysisStudy this chapterPractise this chapter

Kinetic Theory: questions per paper

0241’171’181’193’201’211’221’231’242’252’26