Thermodynamic Processes and Constraints
Learn the different types of thermodynamic processes (isothermal, isochoric, isobaric, adiabatic) and how they are classified based on system constraints.
Why this shows up in the exam
NEET and JEE often test your ability to identify and analyze processes under various constraints.
How NEET tests this
Practise it
These are real questions from past NEET papers that test this exact idea.
The correct option for free expansion of an ideal gas under adiabatic condition is
Push further
More challenging14 harder questions built from the past papers above — a step up in difficulty, with distractors designed so you can't get there by elimination. Written and checked by our reviewers, not from a real paper.
Which of the following correctly describes the change in entropy (ΔS) for an ideal gas undergoing free expansion under adiabatic conditions?
More from Thermodynamics
Thermodynamic Processes and P-V Diagrams
Study different thermodynamic processes (isothermal, isobaric, isochoric, adiabatic, polytropic, cyclic), their definitions, characteristics, and graphical representation on P-V diagrams.
Laws of Thermodynamics
Understand the zeroth and first laws of thermodynamics, including their statements, implications, and applications to physical systems.
Internal Energy, Heat, and Work
Explore the concepts of internal energy, heat, and work, including their definitions, relationships, and how they change during various thermodynamic processes.
Ideal Gas Law and Equation
Learn the ideal gas equation, its relation to physical quantities like pressure, volume, temperature, and density, and its use in describing the behavior of ideal gases.
Gibbs Free Energy and Spontaneity
Learn how Gibbs free energy determines spontaneity, how to calculate it, and its dependence on temperature, pressure, and other thermodynamic parameters.
Entropy and Its Changes
Understand entropy as a measure of disorder, how it changes in physical and chemical processes, and its calculation in various scenarios including phase transitions and isothermal processes.