Q21 / 90 · JEE Main 2021 (25 Jul Shift 2) · Chemistry

A system does $200 J$ of work and at the same time absorbs $150 J$ of heat. The magnitude of the change in internal energy is ______ $J$ . (Nearest integer)

Correct answer: 50

Solution

$w = - 200 J, q = + 150 : Δ U = q + w$

$Δ U = 150 - 200 = - 50 J :$ magnitude $= 50 J = | Δ U |$

Hence, the correct answer is 50.

Relevant Questions

Arrange the following isothermal processes in order of the magnitude of the work ( ) involved between states and . A. Expansion in single st06 Apr, 2026 (M)First Law and Basic Fundamentals of Thermodynamics
Match List - I with List - II. Given and are initial and final volumes respectively. List - I (Isothermal process) List - II (Expression) A.06 Apr, 2026 (E)First Law and Basic Fundamentals of Thermodynamics
The correct order of molar heat capacities measured at and is :05 Apr, 2026 (E)First Law and Basic Fundamentals of Thermodynamics
Given below are two statements: Statement I: For an ideal gas, heat capacity at constant volume is always greater than the heat capacity at 04 Apr, 2026 (M)First Law and Basic Fundamentals of Thermodynamics
Gas 'A' undergoes change from state 'X' to state 'Y'. In this process, the heat absorbed and work done by the gas is J and J respectively. N02 Apr, 2026 (E)First Law and Basic Fundamentals of Thermodynamics
of an ideal gas ' X ' at 600 K and 0.5 MPa undergoes isothermal reversible expansion until pressure of the gas is 0.2 MPa. Which of the foll28 Jan, 2026 (M)First Law and Basic Fundamentals of Thermodynamics