1. First law of thermodynamics states that

2. A system X is neither in thermal equilibrium with Y nor with Z. The systems Y and Z

3. Which of the following macroscopic variable is not measurable?

4. Which of the following is a state variable ?

5. The internal energy of an ideal gas depends upon

6. Energy transfer brought about by moving the piston of a cylinder containing the gas is known as

7. The state of a thermodynamic system is represented by

8. Which of the following parameters does not characterize the thermodynamic state of matter?

9. At a given temperature the internal energy of a substance

10. The variable defined by Zeroth law of thermodynamics is

11. The first operation involved in a Carnot cycle is

12. “Heat cannot by itself flow from a body at lower temperature to a body at higher temperature” is a statement or consequence of

13. Air conditioner is based on the principle of

14. Which of the following processes is reversible?

15. Which of the following processes is irreversible?

16. Heat engine is a device by which a system is made to undergo a ...X... process that result in conversion of ...Y... into work. Here, X and Y refer to

17. Which of the following statements is incorrect?

18. A refrigerator is a

19. The temperature of source and sink of a heat engine are 127ºC and 27ºC respectively. An inventor claims its efficiency to be 26%, then:

20. If the co-efficient of performance of a refrigerator is 5 and operates at the room temperature 27°C, the temperature inside the refrigerator is

21. The following question has four choices out of which ONLY ONE is correct.
A thermodynamical system is changed from state (P1, V1) to (P², V²) by two different processes, the quantity which will remain same is:

22. The temperatures of inside and outside of a refrigerator are 273 K and 303 K respectively. Assuming, that the refrigerator cycle is reversible, for every joule of work done, the heat delivered to the surrounding will be nearly:

23. An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62°C, its efficiency is doubled. Temperature of the source is:

24. A black body at a temperature of 227°C radiates heat at the rate of 20 cal m-2s-1. When its temperature rises to 727°C, the heat radiated will be

25. Directions: The following question has four choices out of which ONLY ONE is correct.
Which of the following is incorrect regarding the first law of thermodynamics? A. It is not applicable to any cyclic process B. It is a restatement of the principle of conservation of energy C. It introduces the concept of the internal energy D. It introduces the concept of the entropy