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Class 11 Physics: Thermodynamics
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MCQs on thermal equilibrium, zeroth law of thermodynamics, heat, internal energy and work, thermodynamics first and second law, thermodynamic processes, heat engines, heat pumps and refrigerators, carnot engine, thermodynamics specific heat capacity, reversible and irreversible processes.

Class 11 Physics: Thermodynamics
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25 Questions

1. Calculate the work done by the gas in an isothermal process from A to B. PA = 1Pa, VA = 3m3, PB = 3Pa.
2. The efficiency of a carnot engine is 50%. The temperature of the hot reservoir is kept constant. By what amount should the temperature of the cold reservoir be decreased so that efficiency becomes 60%.
3. When the state changes from A to B, what will happen to internal energy?
4. In the process A to B to C, 20J of heat is supplied from A to B. 20.5J of heat has been removed from B to C and 2J of heat has been added from C to A. Calculate the value of 'v' from the given conditions in the diagram. The values of pressure and volume given in the graph are in S.I. units.

5. At constant pressure P the volume of a gas increases from V1 to V2 when 'Q' amount of heat is removed from the system. What will happen to internal energy?
6. Which of the following variables is intensive?
7. Internal energy of a system is defined as?
8. Find work done by one mole of a gas in one cycle. V1 = 1m3, V2 = 4m3, V3 = 6m3, V4 =3m3. Temperature is given in °C.

9. In a heat engine heat is converted to work and the process need not be cyclic. True or False?
10. One end of a rod is held in a fire, while the other is held by one's hand. Just assume his hand doesn't get burned. After some time the rod-hand system is in thermal equilibrium. True or False?
11. Which of the following is an example of reversible process?
12. In the given system, 20J of heat is supplied to the gas molecules. The spring is initially not elongated or compressed. If the spring gets compressed by 1cm. Calculate the change in internal energy of the system. Spring constant = 200N/m. Assume piston moves slowly.

13. The given graph corresponds to which equation?

14. ΔU=0 means that the process is isothermic. True or False?
15. Which of the following is an extensive variable?
16. What is the correct order of steps for a carnot cycle?
17. In the given diagram, one process is adiabatic and the other is isothermal. It can be said that process AB is adiabatic. True or False?
18. What is the relation between heat supplied in the 3 processes?

19. Select the correct order of steps in which a working substance(gas) goes through in a refrigerator.
20. The coefficient of a refrigerator can be greater than 1. True or False?
21. Find the value ofVC. PA = 2atm, PB = 6atm, PC = 12atm, VA = 1L. The process AB and CD is isothermal while BC and DA is adiabatic. For adiabatic processes, take γ =1.3.
22. In an isothermal process for an ideal gas, change in internal energy is zero. True or False?
23. Select the correct statement.
24. If 315cal of heat is given to the system, and the system does 20cal of work, find the change in internal energy.
25. If some heat is provided to a system and work is done on it, it is possible that internal energy will decrease. True or False?

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