Thermodynamics MCQs

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1. Which law of thermodynamics states that energy cannot be created or destroyed, only transformed from one form to another?





2. The SI unit of heat and energy is:





3. The process in which no heat is exchanged with the surroundings is known as:





4. The area under the curve on a pressure-volume (PV) diagram represents:





5. Which law of thermodynamics states that the entropy of a system tends to increase over time?





6. What is the specific heat capacity of a substance?





7. The efficiency of a Carnot engine depends on:





8. The change in internal energy of a system is given by:





9. Which process involves constant volume?





10. The process in which temperature remains constant is known as:





11. The efficiency of a heat engine is always:





12. What is the work done by a gas during an isothermal expansion?





13. Which of the following is a state function?





14. What happens to the entropy of a system in an irreversible process?





15. The temperature at which a substance changes from a liquid to a gas is called:





16. Which law of thermodynamics establishes the concept of thermal equilibrium?





17. The maximum possible efficiency of a heat engine operating between two temperatures is given by:





18. What is the work done when a gas expands isothermally according to the ideal gas law?





19. Entropy is a measure of:





20. The specific heat capacity of water is highest compared to other common substances due to:





21. What is the principle behind a refrigerator?





22. Which of the following is a correct statement about the third law of thermodynamics?





23. What does the term โ€œadiabaticโ€ mean in thermodynamics?





24. In a reversible process, the change in entropy of the universe is:





25. The heat capacity of an object depends on:






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