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Saturday, 31 October

JEE Main 2020 · PhysicsMultiple choiceSingle correctEasyConceptual

JEE Main 3 September 2020, Shift 1, Physics Q7

Question 7 of 75 in this shift, Physics question 7 of 25.

A balloon filled with helium (32°C and 1.7 atm.) bursts. Immediately afterwards the expansion of helium can be considered as :
  1. (1)reversible adiabatic
  2. (2)reversible isothermal
  3. (3)irreversible adiabaticOfficial answer
  4. (4)irreversible isothermal

Official answer

Option 3

NTA final key (Sep 2020).

Chapter
Thermodynamics
Topic
Thermodynamic Processes
Idea tested
Irreversible Adiabatic Processes

Same topic in other shifts

All Thermodynamic Processes questions
  1. 2 Apr 2026, Shift 1 · Q33Heat is supplied to a diatomic gas at constant pressure. Then the ratio of ΔQ:ΔU:ΔW\Delta Q : \Delta U : \Delta W is ______.EasySingle correct
  2. 6 Apr 2026, Shift 1 · Q55Arrange the following isothermal processes in order of the magnitude of the work (p −- V) involved between states 1 and 2. A. Expansion…MediumSingle correct
  3. 6 Apr 2026, Shift 2 · Q30A cylinder with adiabatic walls is closed at both ends and is divided into two compartments by a frictionless adiabatic piston. Ideal gas…HardSingle correct
  4. 2 Apr 2025, Shift 1 · Q31In an adiabatic process, which of the following statements is true ?EasySingle correct
  5. 2 Apr 2025, Shift 2 · Q32Identify the characteristics of an adiabatic process in a monoatomic gas. (A) Internal energy is constant. (B) Work done in the process is…MediumOther
  6. 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

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