NEET UG 2018 · Physics · Question 45
NEET 2018 Physics, question 45
Question 45 of the NEET 2018 paper (code AA) is a Physics question from Thermodynamics. Its idea, First Law in Boiling, was asked only this once in NEET 2017–2026. The CBSE official answer key gives option 2.
Updated 2026-10-08
Q45 · Physics
A sample of 0.1 g of water at 100°C and normal pressure ( Nm) requires 54 cal of heat energy to convert to steam at 100°C. If the volume of the steam produced is 167.1 cc, the change in internal energy of the sample, is
- 142.2 J
- 2208.7 JOfficial answer
- 3104.3 J
- 484.5 J
Official answer: option 2 · CBSE official answer key
Same idea
The only question on First Law in Boiling
No other NEET paper from 2017–2026 tested this exact idea.
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.