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Friday, 9 October

JEE Main 2024 · PhysicsMultiple choiceDiagram basedEasyData or graph

JEE Main 29 January 2024, Shift 1, Physics Q38

Question 38 of 90 in this shift, Physics question 8 of 30, Section A. NTA dropped this question from the final key; it is left out of every count on this site.

A thermodynamic system is taken from an original state A to an intermediate state B by a linear process as shown in the figure. It's volume is then reduced to the original value from B to C by an isobaric process. The total work done by the gas from A to B and B to C would be :

The figure, in words

P-V graph: pressure (Dyne/cm^2) on y-axis with marks 4000 and 8000; volume (m^3) on x-axis with marks 3 and 7. A is at (V=3, P=8000), B at (V=7, P=4000), C at (V=3, P=4000). A to B is a straight sloping line (arrow toward B); B to C is a horizontal line at P=4000 (arrow toward C); dashed verticals at V=3 and V=7.
  1. (1)600600 J
  2. (2)12001200 J
  3. (3)22002200 J
  4. (4)3380033800 J

Official answer

Dropped by NTA (marks given to all)

NTA final key.

Chapter
Thermodynamics
Topic
First Law of Thermodynamics
Idea tested
No close match in our taxonomy

Same topic in other shifts

All First Law of Thermodynamics questions
  1. 2 Apr 2026, Shift 1 · Q47A vessel contains 0.15 m30.15\ \mathrm{m^3} of a gas at pressure 88 bar and temperature 140 ∘140\ ^\circC with cp=3Rc_p=3R and cv=2Rc_v=2R. It is…MediumNumerical value
  2. 2 Apr 2026, Shift 2 · Q485 moles of unknown gas is heated at constant volume from 10°C to 20°C. The molar specific heat of this gas at constant pressure cp=8c_p = 8…MediumNumerical value
  3. 5 Apr 2026, Shift 1 · Q33Consider the following statements: A. Zeroth law of thermodynamics gives concept of temperature B. First law of thermodynamics gives…MediumOther
  4. 6 Apr 2026, Shift 1 · Q50A certain gas is isothermally compressed to (13)rd\left(\frac{1}{3}\right)^{\mathrm{rd}} of its initial volume (V0=3V_0=3 litre) by applying…MediumNumerical value
  5. 6 Apr 2026, Shift 2 · Q35If 2 mole of an ideal monoatomic gas at temperature TT, is mixed with 6 mole of another ideal monoatomic gas at temperature 2T2T then the…EasySingle correct
  6. 8 Apr 2026, Shift 2 · Q35One mole of diatomic gas having rotational modes only is kept in a cylinder with a piston system. The cross-section area of the cylinder…MediumSingle correct

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.