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Isobaric and Isochoric Processes for JEE: 17 solved questions

Real JEE paper questions on isobaric and isochoric processes, part of thermodynamics. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2009 to 2026. No sign-in needed to read them.

What this topic asks

• Isobaric Heat and Work — 12 questions
• Isochoric Heating — 5 questions

All 17 questions with solutions

• The internal energy of a monoatomic gas is 3nRT. One mole of helium is kept in a cylinder of internal cross-s… JEE Main 23rd Jan 2nd Shift 2026
• The pressure of an ideal gas contained in a closed vessel increases by 0.4% when it is heated through 1°C. It… JEE Main 3rd April 2nd Shift 2025
• A total of 48 J of heat is given to one mole of helium kept in a cylinder. The temperature of the helium incr… JEE Main 6th April 2nd Shift 2024
• A diatomic gas with γ=1.4 does 100 J of work in an isobaric expansion. The heat given to the gas is JEE Main 8th April 2nd Shift 2024
• 0.08 kg of air is heated at constant volume through 5°C. The specific heat of air at constant volume is 0.17… JEE Main 27th Jan 1st Shift 2024
• Heat energy of 735 J is given to a diatomic gas, allowing the gas to expand at constant pressure. Each gas mo… JEE Main 31st Jan 2nd Shift 2023
• n moles of an ideal gas with constant-volume heat capacity C_V undergo an isobaric expansion by a certain vol… JEE Main 10th April 1st Shift 2019
• A diatomic gas with rigid molecules does 10 J of work when expanded at constant pressure. What would be the h… JEE Main 12th April 2nd Shift 2019
• Half a mole of an ideal monoatomic gas is heated at a constant pressure of 1 atm from 20°C to 90°C. The work… JEE Main 10th Jan 2nd Shift 2019
• The ratio of the work done by an ideal monoatomic gas to the heat supplied to it in an isobaric process is JEE Main 2016
• The equation of state for a gas is PV=nRT+α V, where n is the number of moles and α is a positive constant. T… JEE Main 2014
• Two moles of helium gas are taken over the cycle ABCDA shown in the P-T diagram. Assuming the gas to be ideal… JEE Main 2009
• 5 moles of an unknown gas are heated at constant volume from 10°C to 20°C. The molar specific heat of this ga… JEE Main 2nd April 2nd Shift 2026
• 10 moles of oxygen are heated at constant volume from 30°C to 40°C. The change in the internal energy of the… JEE Main 21st Jan 1st Shift 2026
• A diatomic gas with γ=1.4 does 100 J of work when it is expanded isobarically. The heat given to the gas is J. JEE Main 21st Jan 2nd Shift 2026
• A container of fixed volume contains a gas at 27°C. To double the pressure of the gas, its temperature should… JEE Main 29th Jan 1st Shift 2025
• A diatomic gas with γ=1.4 does 400 J of work when it is expanded isobarically. The heat given to the gas in t… JEE Main 27th June 2nd Shift 2022