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Saturday, 31 October

JEE Main 2021 · PhysicsMultiple choiceDiagram basedMediumData or graph

JEE Main 17 March 2021, Shift 2, Physics Q19

Question 19 of 90 in this shift, Physics question 19 of 30, Section A.

Which one is the correct option for the two different thermodynamic processes ?

The figure, in words

Four small graphs. (a) P (vertical) versus V: a vertical straight line labelled adiabatic and a decreasing curve labelled isothermal. (b) P versus T: a horizontal straight line, and an increasing curve; the curve is labelled adiabatic and the horizontal line is labelled isothermal (by arrow near where the curve meets the line). (c) V versus T: a vertical straight line labelled isothermal and a decreasing curve labelled adiabatic. (d) P versus T: a vertical straight line labelled isothermal and an increasing curve labelled adiabatic.
  1. (1)(a) only
  2. (2)(b) and (c)
  3. (3)(c) and (a)
  4. (4)(c) and (d)Official answer

Official answer

Option 4

NTA final key.

Chapter
Thermodynamics
Topic
Thermodynamic Processes
Idea tested
Indicator Diagram Conversions

Same idea in other shifts

Asked 3× in all
  1. 8 Jan 2020, Shift 1 · Q8A thermodynamic cycle xyzxxyzx is shown on a V-T diagram. The P-V diagram that best describes this cycle is : (Diagrams are schematic and…MediumDiagram basedHas a figure
  2. 9 Jan 2020, Shift 1 · Q7Which of the following is an equivalent cyclic process corresponding to the thermodynamic cyclic given in the figure ? where,…MediumDiagram basedHas 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 108 of the 174 JEE Main shifts held from 2017 to 2026.