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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.
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Physics Thermodynamics Chapter Online Test

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

Remains the same

Becomes zero

Decreases

Increases

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

All of the above

Heat

Internal energy

Work

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

Latent heat

Molar heat capacity

Specific heat

Thermal conductivity

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

Heat

Temperature

Pressure

Volume

5. Which law defines the mechanical equivalent of heat?

Law of conservation of momentum

Boyle’s law

First law of thermodynamics

Newton's law

6. Which equation represents the first law of thermodynamics?

F = ma

Q = mcΔT

ΔU = Q – W

PV = nRT

7. Which instrument is used to measure heat?

Barometer

Calorimeter

Voltmeter

Thermometer

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

Pressure

Internal energy

Latent heat

Specific heat

9. During isobaric expansion of gas:

Volume remains constant

No work is done

Pressure remains constant

Pressure increases

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

Minimum

Equal to heat

Maximum

Zero

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

Energy due to external force

Heat energy only

Energy required for phase change

Total kinetic and potential energy of molecules

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

Third law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

Zeroth law of thermodynamics

13. Specific heat is lowest for:

Lead

Iron

Aluminum

Water

14. 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?

600 J

9000 J

3000 J

1000 J

15. Which of the following is an extensive property?

Specific heat

Pressure

Temperature

Internal energy

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

Internal energy

Mass

Volume

Pressure only

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

Zero

Equal to work done

Constant

Infinite

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

Raise the temperature of 1 mole by 1°C

Melt one mole of substance

Freeze one mole of liquid

Boil one mole of water

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

300 J

100 J

250 J

150 J

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

Becomes zero

Remains same

Increases

Decreases

21. The total energy of an isolated system:

Decreases

Increases

Remains constant

Becomes zero

22. What does a negative ΔU indicate?

System has gained energy

Temperature increases

Internal energy has decreased

Energy is absorbed

23. What is specific heat?

Heat required to change state

Heat required to increase pressure

Heat required for melting

Heat required to raise temperature of 1 kg by 1 K

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

Work done by the system

Heat added to the system

Pressure × Volume

Heat added minus work done

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

Adiabatic

Isothermal

Isobaric

Isochoric

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26. Which process shows ΔU = 0?

Adiabatic

Isothermal

Isobaric

Isochoric

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

Work done by the system

Heat absorbed

No work

Work done on the system

28. Which of the following is a state function?

Path

Internal energy

Heat

Work

29. The SI unit of heat is:

Calorie

Watt

Joule

Kelvin

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

J/kg

J/mol·K

J/K

J/kg·K

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

Isobaric

Isochoric

Isothermal

Adiabatic

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

Increases

Remains constant

Decreases

Becomes negative

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

It flows from cold to hot

It flows from hot to cold

It is stored in the body

It is a form of matter

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

Isochoric

Adiabatic

Free expansion

Isothermal

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

Isobaric

Adiabatic

Isothermal

Isochoric

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

Becomes zero

Doubles

Decreases

Increases

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

Ideal gas law

Charles’s law

Boyle’s law

Dalton’s law

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

Temperature remains constant

Internal energy increases

Internal energy remains unchanged

Internal energy decreases

39. The first law of thermodynamics violates:

Destruction of mass

Conservation of momentum

Conservation of energy

Creation of energy

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

Copper

Iron

Mercury

Water

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

W = ΔU

W = PΔV

W = Q

W = PV

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

0.42 J/kg·K

4200 J/kg·K

420 J/kg·K

4.2 J/kg·K

43. When a gas is compressed, work is:

Done on the gas

Zero

Done by the gas

Infinite

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

Monoatomic gases

Metals

Water

Diatomic gases

45. What does an isothermal process imply?

Constant entropy

Constant temperature

Constant volume

Constant pressure

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

Pressure

Internal energy

Molar specific heat

Specific heat

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

Energy is added to the system

Energy is released by the system

Volume decreases

Pressure increases

48. What is the heat capacity of a substance?

Heat required to raise temperature by 1°C

Heat required to change state

Volume × density

Mass × temperature

49. In which process is ΔU = Q?

Isobaric

Adiabatic

Isothermal

Isochoric

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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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