JEE Physics

First Law & Internal Energy: JEE Questions & Solutions

23 previous-year JEE Physics questions on First Law & Internal Energy, each with a worked step-by-step solution.

Intermediate

Previous-year questions

  1. 0110 mole of oxygen is heated at constant volume from 30 ^°C to 40 ^°C. The change in the internal energy of the gas is cal. (The molecular…NVAEasyJEE 2026
  2. 02A diatomic gas (γ = 1.4) does 100 J of work when it is expanded isobarically. Then the heat given to the gas is J.NVAEasyJEE 2026
  3. 03The internal energy of a monoatomic gas is 3nRT. One mole of helium is kept in a cylinder having internal cross-sectional area 17 cm² and…MCQMediumJEE 2026
  4. 04Density of water at 4^°C and 20^°C are 1000 kg/m³ and 998 kg/m³ respectively. The increase in internal energy of 4 kg of water when it is…MCQEasyJEE 2026
  5. 0510 mole of an ideal gas is undergoing the cyclic process described below, drawn on a P-V diagram with P in Pa and V in m³ (the volume axis…MCQEasyJEE 2026
  6. 06When 300 J of heat is given to an ideal gas with C_p = 7/2R, its temperature rises from 20^° C to 50^° C keeping its volume constant. The…NVAMediumJEE 2026
  7. 07In the following p–V diagram, the equation of state along the curved path is given by (V-2)² = 4ap, where a is a constant. The total work…MCQMediumJEE 2026
  8. 08A thermodynamic system is taken through the cyclic process ABC as shown in the P - V diagram. The total work done by the system during the…NVAEasyJEE 2026
  9. 09Given are statements for certain thermodynamic variables: [(A)] Internal energy, volume V, and mass M are extensive variables. [(B)]…MCQEasyJEE 2025
  10. 10Using the given P-V diagram, the work done by an ideal gas along the path ABCD is:MCQEasyJEE 2025
  11. 11An ideal gas goes from an initial state to final state. During the process, the pressure of the gas increases linearly with temperature. A.…MCQEasyJEE 2025
  12. 12The magnitude of heat exchanged by a system for the given cyclic process ABC (as shown in the figure) is (in SI units):MCQMediumJEE 2025
  13. 13During the melting of a slab of ice at 273 K at atmospheric pressure:MCQEasyJEE 2025
  14. 14Match List-I with List-II. | List-I | List-II | |---|---| | (A) Isobaric | (I) Δ Q = Δ W | | (B) Isochoric | (II) Δ Q = Δ U | | (C)…MCQEasyJEE 2025
  15. 15An ideal gas has undergone through the cyclic process as shown in the figure. Work done by the gas in the entire cycle is × 10⁻¹ J. (Take π…NVAEasyJEE 2025
  16. 16A real gas within a closed chamber at 27^° C undergoes the cyclic process as shown in the figure. The gas obeys the PV³ = RT equation for…MCQMediumJEE 2024
  17. 171 g of a liquid is converted to vapour at 3 × 10⁵ Pa pressure. If 10% of the heat supplied is used for increasing the volume by 1600 cm³…MCQEasyJEE 2023
  18. 18Assertion A: If dQ and dW represent the heat supplied to the system and the work done on the system respectively, then according to the…MCQEasyJEE 2023
  19. 19The pressure of a gas changes linearly with volume from A to B as shown in the figure. If no heat is supplied to or extracted from the gas,…MCQMediumJEE 2023
  20. 20A source supplies heat to a system at the rate of 1000 W. If the system performs work at a rate of 200 W, the rate at which internal energy…MCQEasyJEE 2023
  21. 21Given below are two statements: Statement I: If heat is added to a system, its temperature must increase. Statement II: If positive work is…MCQEasyJEE 2023
  22. 221 kg of water at 100^° C is converted into steam at 100^° C by boiling at atmospheric pressure. The volume of water changes from 1.00 ×…MCQMediumJEE 2023
  23. 23A thermodynamic system is taken through a cyclic process as shown in the P-V diagram. The total work done in the process isMCQEasyJEE 2023

Frequently asked questions

Our bank has 23 previous-year JEE Physics questions tagged to First Law & Internal Energy, drawn from JEE papers between 2023 and 2026, including 8 from 2026 alone. Each comes with a full step-by-step solution.

First Law & Internal Energy is rated Intermediate overall for JEE Physics. The PYQs on this page break down as 16 easy, 7 medium.

Of the 23 previous-year questions on First Law & Internal Energy, 18 are multiple-choice (MCQ) and 5 are numerical-value (NVA) questions.

Based on recent paper analysis, First Law & Internal Energy is worth about 2 marks in JEE Main. It sits in Thermodynamics, a Class 11 Physics chapter.

More Thermodynamics topics

Isothermal & Adiabatic Processes28Second Law & Heat Engines6Zeroth Law of Thermodynamics0Reversible & Irreversible Processes0

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