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

100 J

150 J

300 J

250 J

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

Isothermal

Isobaric

Isochoric

Adiabatic

3. 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

1000 J

9000 J

3000 J

4. During isobaric expansion of gas:

Pressure increases

Pressure remains constant

No work is done

Volume remains constant

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

Decreases

Remains same

Increases

Becomes zero

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

Increases

Decreases

Becomes zero

Doubles

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

Temperature remains constant

Internal energy increases

Internal energy decreases

Internal energy remains unchanged

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

Latent heat

Pressure

Internal energy

Specific heat

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

4.2 J/kg·K

0.42 J/kg·K

420 J/kg·K

4200 J/kg·K

10. Which of the following is an extensive property?

Pressure

Temperature

Specific heat

Internal energy

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

All of the above

Heat

Internal energy

Work

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

Pressure

Volume

Temperature

Heat

13. 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

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

Boil one mole of water

Raise the temperature of 1 mole by 1°C

Melt one mole of substance

Freeze one mole of liquid

15. What is specific heat?

Heat required for melting

Heat required to increase pressure

Heat required to change state

Heat required to raise temperature of 1 kg by 1 K

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

Energy required for phase change

Energy due to external force

Total kinetic and potential energy of molecules

Heat energy only

17. In which process is ΔU = Q?

Isothermal

Adiabatic

Isochoric

Isobaric

18. Which instrument is used to measure heat?

Barometer

Voltmeter

Thermometer

Calorimeter

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

W = Q

W = ΔU

W = PΔV

W = PV

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

Adiabatic

Isothermal

Isobaric

Isochoric

21. Which of the following is a state function?

Heat

Internal energy

Path

Work

22. When a gas is compressed, work is:

Done on the gas

Done by the gas

Zero

Infinite

23. 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

24. What does an isothermal process imply?

Constant entropy

Constant pressure

Constant volume

Constant temperature

25. The SI unit of heat is:

Calorie

Joule

Watt

Kelvin

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26. What does a negative ΔU indicate?

System has gained energy

Internal energy has decreased

Energy is absorbed

Temperature increases

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

Increases

Becomes negative

Remains constant

Decreases

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

First law of thermodynamics

Third law of thermodynamics

Second law of thermodynamics

Zeroth law of thermodynamics

29. What is the heat capacity of a substance?

Volume × density

Heat required to change state

Heat required to raise temperature by 1°C

Mass × temperature

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

Charles’s law

Ideal gas law

Boyle’s law

Dalton’s law

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

Monoatomic gases

Metals

Water

Diatomic gases

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

It flows from hot to cold

It flows from cold to hot

It is stored in the body

It is a form of matter

33. Which law defines the mechanical equivalent of heat?

Newton's law

Boyle’s law

Law of conservation of momentum

First law of thermodynamics

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

Specific heat

Pressure

Molar specific heat

Internal energy

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

Water

Copper

Iron

Mercury

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

Minimum

Maximum

Equal to heat

Zero

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

Becomes zero

Increases

Decreases

Remains the same

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

Adiabatic

Isochoric

Isothermal

Isobaric

39. The first law of thermodynamics violates:

Creation of energy

Destruction of mass

Conservation of energy

Conservation of momentum

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

Isochoric

Free expansion

Isothermal

Adiabatic

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

Volume

Pressure only

Internal energy

Mass

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

Infinite

Zero

Constant

Equal to work done

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

Work done by the system

Pressure × Volume

Heat added minus work done

Heat added to the system

44. The total energy of an isolated system:

Remains constant

Becomes zero

Decreases

Increases

45. Which process shows ΔU = 0?

Isobaric

Isochoric

Adiabatic

Isothermal

46. Which equation represents the first law of thermodynamics?

ΔU = Q – W

Q = mcΔT

F = ma

PV = nRT

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

J/mol·K

J/kg·K

J/kg

J/K

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

Pressure increases

Energy is added to the system

Energy is released by the system

Volume decreases

49. Specific heat is lowest for:

Water

Aluminum

Lead

Iron

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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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