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MDCAT Thermodynamics Test Online

Mustansar KhanLast Updated: May 26, 2025

Physics Thermodynamics MCQS Online Test

MDCAT Physics Thermodynamics Chapter Online Test

Total Questions:	49
Time Allowed:	25 Minutes
Total Marks:	49
How to Attempt Test:	Please choose the right Option in MCQ-type question.
Test Helpful For:	MDCAT Entry Test Physics Online Test Interview Questions about Physics All Universities Entrance Test Recruitments Tests

Physics Thermodynamics Chapter Online Test

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

Adiabatic

Free expansion

Isochoric

Isothermal

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

Total kinetic and potential energy of molecules

Energy due to external force

Energy required for phase change

Heat energy only

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

150 J

250 J

100 J

300 J

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

Increases

Becomes zero

Decreases

Remains the same

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

No work

Work done by the system

Heat absorbed

Work done on the system

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

Isobaric

Adiabatic

Isochoric

Isothermal

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

Zeroth law of thermodynamics

Second law of thermodynamics

First law of thermodynamics

Third law of thermodynamics

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

Pressure increases

Energy is added to the system

Energy is released by the system

Volume decreases

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

It flows from cold to hot

It is a form of matter

It is stored in the body

It flows from hot to cold

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

Internal energy

Pressure

Specific heat

Latent heat

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

Adiabatic

Isochoric

Isobaric

Isothermal

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

Iron

Copper

Mercury

Water

13. Which equation represents the first law of thermodynamics?

Q = mcΔT

F = ma

ΔU = Q – W

PV = nRT

14. What does an isothermal process imply?

Constant entropy

Constant volume

Constant pressure

Constant temperature

15. In which process is ΔU = Q?

Isobaric

Isochoric

Adiabatic

Isothermal

16. When a gas is compressed, work is:

Zero

Done by the gas

Infinite

Done on the gas

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

Freeze one mole of liquid

Boil one mole of water

Melt one mole of substance

Raise the temperature of 1 mole by 1°C

18. Which law defines the mechanical equivalent of heat?

Boyle’s law

Newton's law

Law of conservation of momentum

First law of thermodynamics

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

W = Q

W = PV

W = PΔV

W = ΔU

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

Maximum

Equal to heat

Zero

Minimum

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

Molar specific heat

Pressure

Internal energy

Specific heat

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

Isochoric

Isobaric

Isothermal

Adiabatic

23. What does a negative ΔU indicate?

Temperature increases

Internal energy has decreased

Energy is absorbed

System has gained energy

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

Temperature

Volume

Heat

Pressure

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

Becomes negative

Remains constant

Increases

Decreases

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

Internal energy

All of the above

Heat

Work

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

J/kg·K

J/K

J/kg

J/mol·K

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

Pressure × Volume

Heat added minus work done

Work done by the system

Heat added to the system

29. Which instrument is used to measure heat?

Calorimeter

Voltmeter

Barometer

Thermometer

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

Water

Monoatomic gases

Diatomic gases

Metals

31. Specific heat is lowest for:

Lead

Aluminum

Iron

Water

32. Which process shows ΔU = 0?

Adiabatic

Isobaric

Isochoric

Isothermal

33. Which of the following is an extensive property?

Pressure

Specific heat

Temperature

Internal energy

34. What is the heat capacity of a substance?

Mass × temperature

Heat required to raise temperature by 1°C

Heat required to change state

Volume × density

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

Internal energy increases

Temperature remains constant

Internal energy decreases

Internal energy remains unchanged

36. Which of the following is a state function?

Internal energy

Work

Heat

Path

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

Infinite

Equal to work done

Zero

Constant

38. The SI unit of heat is:

Watt

Calorie

Kelvin

Joule

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

Decreases

Doubles

Increases

Becomes zero

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

Latent heat

Specific heat

Molar heat capacity

Thermal conductivity

41. The first law of thermodynamics violates:

Destruction of mass

Conservation of momentum

Creation of energy

Conservation of energy

42. 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?

1000 J

9000 J

600 J

3000 J

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

Increases

Becomes zero

Remains same

Decreases

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

420 J/kg·K

0.42 J/kg·K

4200 J/kg·K

4.2 J/kg·K

45. During isobaric expansion of gas:

No work is done

Pressure remains constant

Volume remains constant

Pressure increases

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

Mass

Volume

Internal energy

Pressure only

47. What is specific heat?

Heat required to increase pressure

Heat required for melting

Heat required to change state

Heat required to raise temperature of 1 kg by 1 K

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

Boyle’s law

Charles’s law

Dalton’s law

Ideal gas law

49. The total energy of an isolated system:

Becomes zero

Decreases

Increases

Remains constant

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Mustansar KhanLast Updated: May 26, 2025

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MDCAT Thermodynamics Test Online

Physics Thermodynamics MCQS Online Test

MDCAT Physics Thermodynamics Chapter Online Test

Physics Thermodynamics Chapter Online Test

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Physics Thermodynamics MCQS Online Test

MDCAT Physics Thermodynamics Chapter Online Test

Physics Thermodynamics Chapter Online Test

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