Laws of Thermodynamics
Understand the zeroth and first laws of thermodynamics, including their statements, implications, and applications to physical systems.
Why this shows up in the exam
NEET tests your ability to recall, interpret, and apply these fundamental laws to solve conceptual and numerical problems.
How NEET tests this
Practise it
These are real questions from past NEET papers that test this exact idea.
Assertion A: The zeroth law said that, when two systems A and B are in thermal equilibrium, there must be a physical quantity that has the same value for both. Reason R: The physical quantity which is the same for both systems is temperature.
Push further
More challenging16 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.
During an isothermal compression of an ideal gas, 30 J of work is done ON the gas. What is the change in the internal energy of the gas?
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.
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.
Enthalpy Changes and Bond Energies
Learn to calculate enthalpy changes for reactions using bond enthalpies, enthalpy of formation, and Hess's law.