NEET UG 2018 · Physics · Question 4
NEET 2018 Physics, question 4
Question 4 of the NEET 2018 paper (code AA) is a Physics question from Thermodynamics. Its idea, Carnot Efficiency Formula, was asked only this once in NEET 2017–2026. The CBSE official answer key gives option 3.
Updated 2026-10-08
Q4 · Physics
The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is
- 16.25%
- 220%
- 326.8%Official answer
- 412.5%
Official answer: option 3 · CBSE official answer key
Same idea
The only question on Carnot Efficiency Formula
No other NEET paper from 2017–2026 tested this exact idea.
Carnot Efficiency Formula: 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. Carnot Engine alone had 3.