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Saturday, 10 October

JEE Main 2024 · PhysicsMultiple choiceSingle correctHardMulti-step

JEE Main 9 April 2024, Shift 2, Physics Q36

Question 36 of 90 in this shift, Physics question 6 of 30, Section A.

A real gas within a closed chamber at 27∘C27^\circ C undergoes the cyclic process as shown in figure. The gas obeys PV3=RTPV^3=RT equation for the path AA to BB. The net work done in the complete cycle is (assuming R=8R=8 J/mol K) :

The figure, in words

P-V diagram, P in N/m^2 (marks 10 and 20) vs V in m^3 (marks 2 and 4). A at (V=2, P=20); B at (V=4, P=10); C at (V=2, P=10). Curve A to B (PV^3=RT) falling; B to C horizontal at P=10 (arrow leftward); C to A vertical at V=2 (arrow upward).
  1. (1)20 J20\ J
  2. (2)−20 J-20\ J
  3. (3)205 J205\ JOfficial answer
  4. (4)225 J225\ J

Official answer

Option 3

NTA final key.

Chapter
Thermodynamics
Topic
Thermodynamic Processes
Idea tested
Cyclic Process Work

Same idea in other shifts

Asked 3× in all
  1. 3 Apr 2025, Shift 2 · Q33An ideal gas exists in a state with pressure P0\mathrm{P_0}, volume V0\mathrm{V_0}. It is isothermally expanded to 4 times of its initial…MediumSingle correct
  2. 7 Apr 2025, Shift 1 · Q48An ideal gas has undergone through the cyclic process as shown in the figure. Work done by the gas in the entire cycle is _______…MediumNumerical valueHas a figure

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 42 of the 174 JEE Main shifts held from 2017 to 2026.