Thermodynamics Quiz - CBSE Class 11 Science

Free practice quiz: Thermodynamics (CBSE Class 11 Science). 20 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 11 Science practice quiz has 20 multiple-choice questions on Thermodynamics, and 20 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following is NOT a state function?

   1. Internal energy
   2. Enthalpy
   3. Heat
   4. Entropy
   Show answer

   Answer: C. Heat

   State functions depend only on the initial and final states of the system, not the path taken. Heat and work are path functions, not state functions.

2. What is an adiabatic process?

   1. A process that occurs at constant temperature.
   2. A process that occurs at constant pressure.
   3. A process that occurs at constant volume.
   4. A process that occurs without heat exchange with the surroundings.
   Show answer

   Answer: D. A process that occurs without heat exchange with the surroundings.

   In an adiabatic process, there is no heat transfer (q=0).

3. What is Gibbs Free Energy?

   1. A measure of the total energy of a system.
   2. A measure of the disorder or randomness of a system.
   3. A measure of the spontaneity of a reaction.
   4. A measure of the heat capacity of a system.
   Show answer

   Answer: C. A measure of the spontaneity of a reaction.

   Gibbs Free Energy (G) determines the spontaneity of a reaction at constant temperature and pressure. A negative ΔG indicates a spontaneous reaction.

4. How does the efficiency of a Carnot engine depend on the temperatures of the hot and cold reservoirs?

   1. It is independent of the temperatures.
   2. It increases with increasing temperature difference between the reservoirs.
   3. It decreases with increasing temperature difference between the reservoirs.
   4. It is only dependent on the temperature of the hot reservoir.
   Show answer

   Answer: B. It increases with increasing temperature difference between the reservoirs.

   The efficiency of a Carnot engine is given by 1 - (Tc/Th), where Tc and Th are the absolute temperatures of the cold and hot reservoirs, respectively. A larger temperature difference leads to higher efficiency.

5. Explain the difference between an endothermic and an exothermic process.

   1. Endothermic processes release heat, while exothermic processes absorb heat.
   2. Endothermic processes absorb heat, while exothermic processes release heat.
   3. Both processes release heat.
   4. Both processes absorb heat.
   Show answer

   Answer: B. Endothermic processes absorb heat, while exothermic processes release heat.

   Endothermic processes absorb heat from their surroundings, resulting in a decrease in temperature. Exothermic processes release heat to their surroundings, resulting in an increase in temperature.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the first law of thermodynamics?
2. What is the SI unit of entropy?
3. Define enthalpy.
4. What is an isothermal process?
5. Explain the concept of entropy in thermodynamics.
6. State the second law of thermodynamics.
7. Derive the relationship between Gibbs Free Energy, enthalpy, and entropy.
8. Explain the concept of a reversible process in thermodynamics.
9. What is the Carnot cycle?
10. Describe the concept of a heat engine and its efficiency.
11. Explain the concept of a heat pump and its coefficient of performance (COP).
12. What is the third law of thermodynamics?
13. Discuss the limitations of the first law of thermodynamics.
14. Describe how the Helmholtz free energy is used to determine the spontaneity of a process at constant volume.
15. Explain the concept of thermodynamic equilibrium and its conditions.

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