Learn

Friday, 9 October

NEET UG 2018 · Physics · Question 1

NEET 2018 Physics, question 1

Question 1 of the NEET 2018 paper (code AA) is a Physics question from Thermodynamics. Its idea, First Law in Isobaric Processes, was asked twice, in 2018 and 2025, across NEET 2017–2026. The CBSE official answer key gives option 3.

Updated 2026-10-08

Q1 · Physics

The volume (V) of a monatomic gas varies with its temperature (T), as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state A to state B, is

The figure, described in words

V vs T graph: straight line through origin O, process from A to B along the line (isobaric).

  1. 113\frac{1}{3}
  2. 223\frac{2}{3}
  3. 325\frac{2}{5}Official answer
  4. 427\frac{2}{7}

Official answer: option 3 · CBSE official answer key

Same idea

First Law in Isobaric Processes, in other papers

NEET asked this idea twice, in 2018 and 2025. The other question below.

  • 2025 Q41Two gases AA and BB are filled at the same pressure in separate cylinders with movable pistons of radius rAr_A and rBr_B, respectively.…Numerical · Medium

First Law in Isobaric Processes: every question and how it was framed

The chapter

Thermodynamics in ten years of NEET

32 questions from 2017–2026, asked in 10 of 10 papers, about 3.1 a paper. Laws of Thermodynamics alone had 10.

Chapter analysisStudy this chapterPractise this chapter

Thermodynamics: questions per paper

0364’174’183’193’202’212’222’234’243’255’26