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Friday, 9 October

JEE Main 2023 · PhysicsMultiple choiceSingle correctMediumMulti-step

JEE Main 11 April 2023, Shift 1, Physics Q44

Question 44 of 90 in this shift, Physics question 14 of 30, Section A.

1 kg of water at 100∘100^\circC is converted into steam at 100∘100^\circC by boiling at atmospheric pressure. The volume of water changes from 1.00×10−3 m31.00 \times 10^{-3}\ \mathrm{m^3} as a liquid to 1.671 m31.671\ \mathrm{m^3} as steam. The change in internal energy of the system during the process will be (Given latent heat of vaporisaiton = 2257 kJ/kg, Atmospheric pressure = 1×1051 \times 10^5 Pa)
  1. (1)−2090-2090 kJ
  2. (2)+2090+2090 kJOfficial answer
  3. (3)−2426-2426 kJ
  4. (4)+2476+2476 kJ

Official answer

Option 2

NTA final key.

Chapter
Thermodynamics
Topic
First Law of Thermodynamics
Idea tested
First Law in Phase Transitions

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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.