Learn

Friday, 9 October

JEE Main 2025 · PhysicsMultiple choiceSingle correctEasyCalculation

JEE Main 3 April 2025, Shift 1, Physics Q34

Question 34 of 75 in this shift, Physics question 9 of 25, Section A.

A gas is kept in a container having walls which are thermally non-conducting. Initially the gas has a volume of 800 cm3800\ \mathrm{cm^3} and temperature 27∘C27^\circ\mathrm{C}. The change in temperature when the gas is adiabatically compressed to 200 cm3200\ \mathrm{cm^3} is: (Take γ=1.5\gamma = 1.5 ; γ\gamma is the ratio of specific heats at constant pressure and at constant volume)
  1. (1)600 K
  2. (2)300 KOfficial answer
  3. (3)327 K
  4. (4)522 K

Official answer

Option 2

NTA final key.

Chapter
Thermodynamics
Topic
First Law of Thermodynamics
Idea tested
Adiabatic T-V Relation

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