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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceDiagram basedMediumMulti-step

JEE Main 28 June 2022, Shift 2, Physics Q38

Question 38 of 90 in this shift, Physics question 8 of 30, Section A.

A sample of an ideal gas is taken through the cyclic process ABCA as shown in figure. It absorbs, 40 J of heat during the part AB, no heat during BC and rejects 60 J of heat during CA. A work of 50 J is done on the gas during the part BC. The internal energy of the gas at A is 1560 J. The workdone by the gas during the part CA is :

The figure, in words

P-V diagram with P on the vertical axis and V on the horizontal axis. A small right triangle with points labelled B (top), A (directly below B, lower right) and C (to the left, at the same level as A). Arrows: from C toward A along the horizontal side, and on the slanted side between B and C pointing toward C (down-left).
  1. (1)20 J
  2. (2)30 JOfficial answer
  3. (3)−-30 J
  4. (4)−-60 J

Official answer

Option 2

NTA final key.

Chapter
Thermodynamics
Topic
First Law of Thermodynamics
Idea tested
First Law in Cyclic Processes

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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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.