Thermodynamics Online Mcqs Test

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Question 1

1. What is the heat required to raise the temperature of 5 kg of a substance with specific heat 200 J/kg·K by 3 K?

Question 2

2. When W = Q in the first law equation, what is ΔU?

Answer

Equal to heat

Question 3

3. If Q = 200 J and W = 50 J, what is the change in internal energy?

Question 4

4. Which process shows ΔU = 0?

Answer

Isothermal

Question 5

5. In an adiabatic process, if work is positive:

Answer

Internal energy decreases

Answer

Internal energy increases

Answer

Internal energy remains unchanged

Answer

Temperature remains constant

Question 6

6. When a system performs positive work, it means:

Answer

Energy is released by the system

Answer

Pressure increases

Answer

Volume decreases

Answer

Energy is added to the system

Question 7

7. Which of the following is a state function?

Answer

Internal energy

Question 8

8. Which physical quantity is represented by the slope of a temperature vs. heat graph during heating?

Answer

Latent heat

Answer

Internal energy

Answer

Specific heat

Question 9

9. What is the heat added in an adiabatic process?

Answer

Equal to work done

Question 10

10. When a gas is compressed, work is:

Answer

Done on the gas

Answer

Done by the gas

Question 11

11. If no heat is exchanged with the surroundings, the process is called:

Answer

Isothermal

Question 12

12. Which equation represents the first law of thermodynamics?

Answer

ΔU = Q – W

Question 13

13. When a gas expands doing work and absorbs heat, its internal energy:

Answer

Remains the same

Answer

Becomes zero

Question 14

14. In a system where no heat is added and work is done on the gas, internal energy:

Answer

Remains same

Answer

Becomes zero

Question 15

15. What does an isothermal process imply?

Answer

Constant volume

Answer

Constant temperature

Answer

Constant entropy

Answer

Constant pressure

Question 16

16. Molar specific heat is the amount of heat required to:

Answer

Melt one mole of substance

Answer

Freeze one mole of liquid

Answer

Boil one mole of water

Answer

Raise the temperature of 1 mole by 1°C

Question 17

17. Which gas law is used in the derivation of the first law of thermodynamics?

Answer

Dalton’s law

Answer

Boyle’s law

Answer

Ideal gas law

Answer

Charles’s law

Question 18

18. What does the term “internal energy” refer to?

Answer

Energy due to external force

Answer

Heat energy only

Answer

Energy required for phase change

Answer

Total kinetic and potential energy of molecules

Question 19

19. Specific heat is lowest for:

Question 20

20. Which law defines the mechanical equivalent of heat?

Answer

Boyle’s law

Answer

Newton's law

Answer

First law of thermodynamics

Answer

Law of conservation of momentum

Question 21

21. What happens to the internal energy in an adiabatic expansion?

Answer

Becomes zero

Question 22

22. The heat required to raise the temperature of one mole of a substance by one Kelvin is:

Answer

Specific heat

Answer

Latent heat

Answer

Molar heat capacity

Answer

Thermal conductivity

Question 23

23. What is the heat capacity of a substance?

Answer

Mass × temperature

Answer

Heat required to raise temperature by 1°C

Answer

Volume × density

Answer

Heat required to change state

Question 24

24. What is the value of specific heat of water?

Answer

0.42 J/kg·K

Answer

4200 J/kg·K

Answer

420 J/kg·K

Answer

4.2 J/kg·K

Question 25

25. Which instrument is used to measure heat?

Answer

Thermometer

Answer

Calorimeter

Question 26

26. In which process is ΔU = Q?

Answer

Isothermal

Question 27

27. Which of the following processes occurs at constant volume?

Answer

Isothermal

Question 28

28. Which of the following has the highest specific heat?

Question 29

29. What is specific heat?

Answer

Heat required to increase pressure

Answer

Heat required to raise temperature of 1 kg by 1 K

Answer

Heat required to change state

Answer

Heat required for melting

Question 30

30. During isobaric expansion of gas:

Answer

Volume remains constant

Answer

No work is done

Answer

Pressure increases

Answer

Pressure remains constant

Question 31

31. Which of the following has the highest molar specific heat at constant pressure?

Answer

Diatomic gases

Answer

Monoatomic gases

Question 32

32. Which of the following does not change during an isothermal process?

Answer

Temperature

Question 33

33. Which of the following has units J/mol·K?

Answer

Specific heat

Answer

Molar specific heat

Answer

Internal energy

Question 34

34. The temperature of a gas is directly proportional to:

Answer

Pressure only

Answer

Internal energy

Question 35

35. The SI unit of heat is:

Question 36

36. Which process occurs without any change in heat content?

Answer

Isothermal

Question 37

37. Which of the following statements is true about heat?

Answer

It flows from cold to hot

Answer

It flows from hot to cold

Answer

It is a form of matter

Answer

It is stored in the body

Question 38

38. Which of the following is an extensive property?

Answer

Specific heat

Answer

Temperature

Answer

Internal energy

Question 39

39. In the first law of thermodynamics, the internal energy change is equal to:

Answer

Pressure × Volume

Answer

Heat added minus work done

Answer

Heat added to the system

Answer

Work done by the system

Question 40

40. The first law of thermodynamics violates:

Answer

Conservation of momentum

Answer

Conservation of energy

Answer

Creation of energy

Answer

Destruction of mass

Question 41

41. What does a negative ΔU indicate?

Answer

System has gained energy

Answer

Temperature increases

Answer

Energy is absorbed

Answer

Internal energy has decreased

Question 42

42. Which of the following is not a path function?

Answer

All of the above

Answer

Internal energy

Question 43

43. The total energy of an isolated system:

Answer

Remains constant

Answer

Becomes zero

Question 44

44. Which thermodynamic process has both Q and W equal to zero?

Answer

Isothermal

Answer

Free expansion

Question 45

45. What is the unit of specific heat in SI?

Question 46

46. Which law states that energy can neither be created nor destroyed?

Answer

First law of thermodynamics

Answer

Third law of thermodynamics

Answer

Second law of thermodynamics

Answer

Zeroth law of thermodynamics

Question 47

47. In the equation ΔU = Q – W, what does a positive W indicate?

Answer

Work done by the system

Answer

Heat absorbed

Answer

Work done on the system

Question 48

48. Which of the following expresses work done at constant pressure?

Question 49

49. What happens to internal energy during an isothermal expansion?

Answer

Becomes negative

Answer

Remains constant

Question 50

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Total Questions:	49
Time Allowed:	25 Minutes
Total Marks:	49
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Thermodynamics Online Mcqs Test

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Important Physics Thermodynamics Question and Answer

Physics Thermodynamics Practice Test Online With Explanation

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