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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. When a gas is compressed, work is:

Zero

Done on the gas

Done by the gas

Infinite

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

Remains same

Decreases

Becomes zero

Increases

3. Specific heat is lowest for:

Aluminum

Iron

Water

Lead

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

No work

Heat absorbed

Work done by the system

Work done on the system

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

Heat

Temperature

Pressure

Volume

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

150 J

100 J

250 J

300 J

7. During isobaric expansion of gas:

Pressure increases

Volume remains constant

Pressure remains constant

No work is done

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

Iron

Water

Copper

Mercury

9. What is the heat capacity of a substance?

Mass × temperature

Heat required to change state

Volume × density

Heat required to raise temperature by 1°C

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

Remains the same

Becomes zero

Decreases

Increases

11. In which process is ΔU = Q?

Adiabatic

Isothermal

Isobaric

Isochoric

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

Melt one mole of substance

Raise the temperature of 1 mole by 1°C

Boil one mole of water

Freeze one mole of liquid

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

Becomes zero

Decreases

Increases

Doubles

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

Infinite

Constant

Equal to work done

Zero

15. Which process shows ΔU = 0?

Adiabatic

Isochoric

Isobaric

Isothermal

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

Isochoric

Isothermal

Adiabatic

Free expansion

17. The total energy of an isolated system:

Becomes zero

Decreases

Remains constant

Increases

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

Ideal gas law

Charles’s law

Dalton’s law

Boyle’s law

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

Latent heat

Specific heat

Pressure

Internal energy

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

Specific heat

Molar heat capacity

Thermal conductivity

Latent heat

21. 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

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

4.2 J/kg·K

0.42 J/kg·K

4200 J/kg·K

420 J/kg·K

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

Internal energy

Pressure

Specific heat

Molar specific heat

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

Work done by the system

Heat added minus work done

Pressure × Volume

Heat added to the system

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

Pressure only

Internal energy

Mass

Volume

Page 2 of 2

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

Decreases

Increases

Becomes negative

Remains constant

27. The SI unit of heat is:

Watt

Joule

Kelvin

Calorie

28. What is specific heat?

Heat required to change state

Heat required for melting

Heat required to raise temperature of 1 kg by 1 K

Heat required to increase pressure

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

Isobaric

Adiabatic

Isochoric

Isothermal

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

J/mol·K

J/kg·K

J/K

J/kg

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

Heat

Internal energy

All of the above

Work

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

Energy required for phase change

Energy due to external force

Heat energy only

Total kinetic and potential energy of molecules

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

Equal to heat

Maximum

Zero

Minimum

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

It flows from hot to cold

It is stored in the body

It flows from cold to hot

It is a form of matter

35. Which instrument is used to measure heat?

Calorimeter

Barometer

Thermometer

Voltmeter

36. Which of the following is a state function?

Heat

Work

Internal energy

Path

37. What does an isothermal process imply?

Constant entropy

Constant pressure

Constant volume

Constant temperature

38. Which of the following is an extensive property?

Internal energy

Temperature

Specific heat

Pressure

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

Adiabatic

Isothermal

Isobaric

Isochoric

40. Which equation represents the first law of thermodynamics?

Q = mcΔT

ΔU = Q – W

PV = nRT

F = ma

41. What does a negative ΔU indicate?

Energy is absorbed

Internal energy has decreased

System has gained energy

Temperature increases

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

Metals

Monoatomic gases

Water

Diatomic gases

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

First law of thermodynamics

Second law of thermodynamics

Zeroth law of thermodynamics

Third law of thermodynamics

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

Temperature remains constant

Internal energy decreases

Internal energy increases

Internal energy remains unchanged

45. Which law defines the mechanical equivalent of heat?

First law of thermodynamics

Law of conservation of momentum

Newton's law

Boyle’s law

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

Isobaric

Isochoric

Adiabatic

Isothermal

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

W = PΔV

W = PV

W = Q

W = ΔU

48. The first law of thermodynamics violates:

Creation of energy

Conservation of momentum

Conservation of energy

Destruction of mass

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

Energy is added to the system

Energy is released by the system

Pressure increases

Volume decreases

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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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Mustansar Khan

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