Home | Heat and Thermodynamics: Important Questions

# Heat and Thermodynamics: Important Questions

1. ‘An object contains more heat’- is it a right statement? If not why?

2. Obtain an ideal gas law from Boyle’s and Charles’ law.

3. Define one mole.

4. Define specific heat capacity and give its unit.

5. Define molar specific heat capacity.

6. What is a thermal expansion?

7. Give the expressions for linear, area and volume thermal expansions.

8. Define latent heat capacity. Give its unit.

9. State Stefan-Boltzmann law.

10. What is Wien’s law?

11. Define thermal conductivity. Give its unit.

12. What is a black body?

13. What is a thermodynamic system? Give examples.

14. What are the different types of thermodynamic systems?

15. What is meant by ‘thermal equilibrium’?

16. What is mean by state variable? Give example.

17. What are intensive and extensive variables? Give examples.

18. What is an equation of state? Give an example.

19. State Zeroth law of thermodynamics.

20. Define the internal energy of the system.

21. Are internal energy and heat energy the same? Explain.

22. Define one calorie.

23. Did joule converted mechanical energy to heat energy? Explain.

24. State the first law of thermodynamics.

25. Can we measure the temperature of the object by touching it?

26. Give the sign convention for Q and W.

27. Define the quasi-static process.

28. Give the expression for work done by the gas.

29. What is PV diagram?

30. Explain why the specific heat capacity at constant pressure is greater than the specific heat capacity at constant volume.

31. Give the equation of state for an isothermal process.

32. Give an expression for work done in an isothermal process.

33. Express the change in internal energy in terms of molar specific heat capacity.

34. Apply first law for (a) an isothermal (b) adiabatic (c) isobaric processes.

35. Give the equation of state for an adiabatic process.

36. Give an equation state for an isochoric process.

37. If the piston of a container is pushed fast inward. Will the ideal gas equation be valid in the intermediate stage? If not, why?

38. Draw the PV diagram for

a. Isothermal process

c. isobaric process

d. Isochoric process

39. What is a cyclic process?

40. What is meant by a reversible and irreversible processes?

41. State Clausius form of the second law of thermodynamics

42. State Kelvin-Planck statement of second law of thermodynamics.

43. Define heat engine.

44. What are processes involves in a Carnot engine?

45. Can the given heat energy be completely converted to work in a cyclic process? If not, when can the heat can completely converted to work?

46. State the second law of thermodynamics in terms of entropy.

47. Why does heat flow from a hot object to a cold object?

48. Define the coefficient of performance.

1. Explain the meaning of heat and work with suitable examples.

2. Discuss the ideal gas laws.

3. Explain in detail the thermal expansion.

4. Describe the anomalous expansion of water. How is it helpful in our lives?

5. Explain Calorimetry and derive an expression for final temperature when two thermodynamic systems are mixed.

6. Discuss various modes of heat transfer.

7. Explain in detail Newton’s law of cooling.

8. Explain Wien’s law and why our eyes are sensitive only to visible rays?

9. Discuss the

a. thermal equilibrium

b. mechanical equilibrium

c. Chemical equilibrium

d. thermodynamic equilibrium.

10. Explain Joule’s Experiment of the mechanical equivalent of heat.

11. Derive the expression for the work done in a volume change in a thermodynamic system.

12. Derive Mayer’s relation for an ideal gas.

13. Explain in detail the isothermal process.

14. Derive the work done in an isothermal process

15. Explain in detail an adiabatic process.

16. Derive the work done in an adiabatic process

17. Explain the isobaric process and derive the work done in this process

18. Explain in detail the isochoric process.

19. What are the limitations of the first law of thermodynamics?

20. Explain the heat engine and obtain its efficiency.

21. Explain in detail Carnot heat engine.

22. Derive the expression for Carnot engine efficiency.

23. Explain the second law of thermodynamics in terms of entropy.

24. Explain in detail the working of a refrigerator.

## Numerical Problems

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