ME Subjects – Concepts Simplified

MCQ FIRST LAW OF THERMODYNAMICS

1. Total energy of the universe is

• (a) Increasing
• (b) Decreasing
• (c) Increasing as well as decreasing
• (d) None

Ans: (d)

2. As per First Law of Thermodynamics, energy can be

• (a) Created
• (b) Destroyed
• (c) Created as well as destroyed
• (d) None

Ans:(d)

3. As per First Law of Thermodynamics, energy cannot be

• (a) Created
• (b) Destroyed
• (c) Created as well as destroyed
• (d) None

Ans:(c)

 

4. Total energy of the universe is

(a) Increasing

(b) Decreasing

(c) Constant

(d) None

Ans: (c)

5. An intensive property is

• (a) Independent of volume
• (b) Independent of density
• (c) Independent of mass
• (d) None

Ans: ©

6. Which of the following is an intensive property?

• (a) Volume
• (b) Enthalpy
• (c) Entropy
• (d) None

Ans: (d)

7. Which of the following is an intensive property?

• (a) Volume
• (b) Enthalpy
• (c) Temperature
• (d) None

Ans: (c)

8. Which of the following is NOT an intensive property?

• (a) Volume
• (b) Pressure
• (c) Temperature
• (d)None

Ans: (a)

9. Heat supplied to a system is

• (a) Work done –Change in internal energy
• (b) Work done +Change in internal energy
• (c) Work done Change in internal energy
• (d) None

Ans : (b)

10. Conversion of heat energy into mechanical work is

• (a) 100 %
• (b) 80%
• (c) 50%
• (d) None

Ans: (d)

11. Conversion of heat energy into mechanical work is

• (a) >100 %
• (b) <100%
• (c) =100%
• (d) None

Ans: (b)s

12. The temperature of a system is

• (a) Extensive property
• (b) Intensive property
• (c) Extensive as well as intensive property
• (d) None

Ans: (b)

 

13. Force is an

• (a) Extensive property
• (b) Intensive property
• (c) Extensive as well as intensive property
• (d) None

Ans: (a)

14. First law of thermodynamics is a law of

• (a) Conservation of enthalpy
•  (b)Conservation of entropy
• (c) Conservation of internal energy
• (d) None

Ans: (d)

 

15. First law of thermodynamics is a law of

• (a) Conservation of enthalpy
• (b) Conservation of entropy
• (c) Conservation of energy
• (d) None

Ans: ( c)

16. Which Property is related to the First Law of Thermodynamics?

(a)Enthalpy

 

(b) Entropy

© Internal energy

(d)None

Ans: ( c )

17. An open system has

• (a) Only Mass transfer
• (b) Only Energy transfer
• (c) Mass as well as energy transfer
• (d) None

Ans: (c )

18. An closed system has

• (a) Only Mass transfer
• (b) Only Energy transfer
• (c) Mass as well as energy transfer
• (d) None

Ans: (a )

 

19. An isolated system has

• (a) Only Mass transfer
• (b) Only Energy transfer
•  (c)Mass as well as energy transfer
• (d) None

Ans: (d )

20. An isolated system has

• (a) No Mass transfer
• (b) No Energy transfer
• (c) No Mass and no energy transfer
• (d) None

Ans: (c )

21. Among the system, boundary and surrounding, the order is

• (a) System, surrounding and boundary
• (b) Surrounding, system and boundary
• (c) System, boundary and surrounding
• (d) None

Ans: (c )

22. A system consists of

• (a) System, boundary and surrounding
• (b) Pressure, temperature and volume
• (c) Intensive, extensive and internal energy
• (d) None

Ans: (a)

23. In a thermodynamic process, which one is NOT a path function?

• (a) Work done
• (b) Heat supplied
• (c) Internal energy
• (d) None

Ans: (c )

24. In a thermodynamic process, which one is a path function?

• (a) Work done
• (b) Enthalpy
• (c) Internal energy
• (d) None

Ans: (a )

25. First law of Thermodynamics deals with the Law of

• (a) Conservation of momentum
• (b) Conservation of mass
• (c) Conservation of internal energy
• (d) None

Ans : (d)

 

26. Increase in enthalpy causes

• (a) Increase in volume
• (b) Increase in pressure
• (c) Increase in mass
• (d) None

Ans: (d)

27. During an exothermic reaction, There is

• (a) Increase in enthalpy
• (b) Decrease in enthalpy
• (c) Remains constant
• (d) None

Ans : (b)

28. During an exothermic reaction, There is

• (a) Increase in mass
• (b) Decrease in mass
• (c) Mass remains constant
• (d) None

Ans : (b)

29.  Unit of enthalpy is

• (a) kJ/kg K
• (b) kJ/m³⁺
• (c) kJ/kg
• (d) None

Ans: (c )

30. I. unit of temperature is   

• (a) ⁰C
• (b) ⁰K
• (c) ⁰F
• (d) None

Ans: (d)

 

31. I. unit of temperature is

• (a) C
• (b) K
• (c) F
• (d) None

Ans: (b)

32. I. unit of mass is

• (a) g
• (b) kg
• (c) lb
• (d) None

Ans: (b)

33. I. unit of pressure is

• (a) Pascal
• (b) mm of Hg
• (c) bar
• (d) None

Ans: (c)

34. Example of a open thermodynamic system is

• (a) Refrigerator
• (b) Air conditioner
• (c) Compressor in a refrigerator
• (d) None

Ans: ( c)

35. Example of a closed thermodynamic system is

• (a) Evaporator in a Refrigerator
• (b) Condenser in an Air conditioner
• (c) Compressor in a refrigerator
• (d) None

Ans: ( d)

36. Which is the thermodynamic system in a human body ?

• (a) Open system
• (b) Closed system
• (c) Isolated system
• (d) None

Ans: (a)

37. The S.I. unit of power is

(a) Newton

(b) Pascal

(c) Joule

(d) None

Ans: (d)

38. Which of the following is NOT a point function?

• (a) Temperature
• (b) Entropy
• (c) Pressure
• (d) None
• Ans: (d)

39. . Which of the following is NOT a point function?

• (a) Temperature
• (b) Entropy
• (c) Heat
• (d) None

Ans: (c)

40. Temperature remains constant in

• (a) Dalton’s Law
• (b) Charles Law
• (c) Raoult’s Law
• (d) None

Ans: (d)

 

41. Temperature remains constant in

• (a) Dalton’s Law
• (b) Charles Law
• (c) Boyle’s Law
• (d) None

Ans: (c)