 # MCQs in Thermodynamics Part I

(Last Updated On: December 8, 2017) This is the Multiples Choice Questions Part 1 of the Series in Thermodynamics as one of the General Engineering and Applied Sciences (GEAS) topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including past Board Questions in General Engineering and Applied Sciences (GEAS) field.

### Online Questions and Answers in Thermodynamics Series

Following is the list of multiple choice questions in this brand new series:

Thermodynamics MCQs
PART 1: MCQs from Number 1 – 50                        Answer key: PART I
PART 2: MCQs from Number 51 – 100                   Answer key: PART II
PART 3: MCQs from Number 101 – 150                 Answer key: PART III
PART 4: MCQs from Number 151 – 200                 Answer key: PART IV
PART 5: MCQs from Number 201 – 250                 Answer key: PART V
PART 6: MCQs from Number 251 – 300                 Answer key: PART VI
PART 7: MCQs from Number 301 – 350                 Answer key: PART VII
PART 8: MCQs from Number 351 – 400                 Answer key: PART VIII
PART 9: MCQs from Number 401 – 450                 Answer key: PART IX
PART 10: MCQs from Number 451 – 500                Answer key: PART X

### Start Practice Exam Test Questions Part I of the Series

Choose the letter of the best answer in each questions.

1. The term “thermodynamics” comes from Greek words “therme” and “dynamis” which means _______.

• A. Heat power
• B. Heat transfer
• C. Heat energy
• D. Heat motion

2. The term “thermodynamics” was first used in 1849 in the publication of a

• A. Rudolph Clausius
• B. William Rankine
• C. Lord Kelvin
• D. Thomas Savery

3. What law asserts that energy is a thermodynamic property?

• A. First law of Thermodynamics
• B. Second law of Thermodynamics
• C. Third law of Thermodynamics
• D. Zeroth law of Thermodynamics

4. What law asserts that energy has quality as well as quantity?

• A. First law of Thermodynamics
• B. Second law of Thermodynamics
• C. Third law of Thermodynamics
• D. Zeroth law of Thermodynamics

5. The macroscopic approach to the study of thermodynamics does not require a knowledge of the behavior of individual particles is called _____.

• A. Dynamic thermodynamics
• B. Static thermodynamics
• C. Statistical thermodynamics
• D. Classical thermodynamics

6. What is the more elaborate approach to the study of thermodynamics and based on the average behavior of large groups of individual particles?

• A. Dynamic thermodynamics
• B. Static thermodynamics
• C. Statistical thermodynamics
• D. Classical thermodynamics

7. What is defined a region in space chosen for study?

• A. Surroundings
• B. System
• C. Boundary
• D. Volume

8. The first law of thermodynamics is based on which of the following principles?

• A. Conservation of mass
• B. Conservation of energy
• C. Action and reaction
• D. The entropy-temperature relationship

9. What is the mass or region outside the system called?

• A. Surroundings
• B. Boundary
• C. Volume
• D. Environment

10. What is the real or imaginary surface that separates the system from its surroundings?

• A. Division
• B. Wall
• C. Boundary
• D. Interface

11. A system which consists of fixed amount of mass and no mass can cross its boundary called _____.

• A. Equilibrium system
• B. Thermal equilibrium system
• C. Open system
• D. Closed system

12. A system in which even energy is not allowed to cross the boundary is called ____.

• A. Closed system
• B. Exclusive system
• C. Isolated system
• D. Special system

13. A system in which there is a flow of mass is known as _____.

• A. Equilibrium system
• B. Isolated system
• C. Open system
• D. Closed system

14. Open system usually encloses which of the following devices?

• A. Compressor
• B. Turbine
• C. Nozzle
• D. All of the above

15. The boundaries of a control volume, which may either real or imaginary is called _____.

• A. Control boundary
• B. Control system
• C. Interface
• D. Control surface

16. Any characteristic of a thermodynamics system is called a _____.

• A. Property
• B. Process
• C. Phase
• D. Cycle

17. How are thermodynamic properties classified?

• A. Physical and chemical
• B. Intensive and extensive
• C. Real and imaginary
• D. Homogeneous and heterogeneous

18. The thermodynamic properties that are independent on the size of the system is called _____.

• A. Extensive property
• B. Intensive property
• C. Open property
• D. Closed property

19. The thermodynamic properties that are dependent on the size or extent of the system is called _____.

• A. Extensive property
• B. Intensive property
• C. Open property
• D. Closed property

20. Which is NOT an intensive property of thermodynamics?

• A. Temperature
• B. Mass
• C. Pressure
• D. Density

21. Which is NOT an extensive property of thermodynamics?

• A. Density
• B. Mass
• C. Volume
• D. Energy

22. Extensive properties per unit mass are called _____.

• A. Specific properties
• B. Relative properties
• C. Unit properties
• D. Phase properties

23. A system is in ______ equilibrium if the temperature is the same throughout the entire system.

• A. Static
• B. Thermal
• C. Mechanical
• D. Phase

24. A system is in ______ equilibrium if there is no change in pressure at any point of the system with time.

• A. Pressure
• B. Thermal
• C. Mechanical
• D. Phase

25. If a system involves two phases, it is in ______ equilibrium when the mass of each phase reaches an equilibrium level and stays there.

• A. Chemical
• B. Thermal
• C. Mechanical
• D. Phase

26. A system is in ______ equilibrium of its chemical composition does not change with time, i.e., no chemical reaction occurs.

• A. Chemical
• B. Thermal
• C. Mechanical
• D. Phase

27. “The state of a simple compressible system is completely specified by two independent, intensive properties”. This is known as ______.

• A. Equilibrium postulate
• B. State postulate
• C. Environment postulate
• D. Compressible system postulate

28. What is the unit of the total energy of the system?

• A. Kj
• B. Kj/Kg
• C. Kg
• D. g

29. Without electrical, mechanical, gravitational, surface tension and motion effects, a system is called _____ system.

• A. Simple
• B. Simple compressible
• C. Compressible
• D. Independent

30. What refers to any change that a system undergoes from one equilibrium state to another equilibrium state?

• A. Process
• B. Path
• C. Phase
• D. Cycle

31. What refers to the series of state through which a system passes during a process?

• A. Path
• B. Phase
• C. Cycle
• D. Direction

32. How many independent properties are required to completely fix the equilibrium state of a pure gaseous compound?

• A. 4
• B. 3
• C. 2
• D. 1

33. What is a process in which the system remains infinitesimally closed to an equilibrium state at all times?

• A. Path equilibrium process
• B. Cycle equilibrium process
• C. Phase equilibrium process
• D. Quasi-state or quasi- equilibrium process

34. A closed system may refer to ______.

• A. Control mass
• B. Control volume
• C. Control energy
• D. Control temperature

35. An open system may refer to ______.

• A. Control mass
• B. Control volume
• C. Control energy
• D. Control temperature

36. A system is said to be in thermodynamic equilibrium if it maintains ______ equilibrium.

• A. Mechanical and phase
• B. Thermal and chemical
• C. Thermal, mechanical and chemical
• D. Thermal, phase, mechanical and chemical

37. What is a process with identical end states called?

• A. Cycle
• B. Path
• C. Phase
• D. Either path or phase

38. What is a process during which the temperature remains constant?

• A. Isobaric process
• B. Isothermal process
• C. Isochoric process
• D. Isometric process

39. What is a process during which the pressure remains constant?

• A. Isobaric process
• B. Isothermal process
• C. Isochoric process
• D. Isometric process

40. What is a process during which the specific volume remains constant?

• A. Isobaric process
• B. Isothermal process
• C. Isochoric or isometric process
• D. Isovolumetric process

41. The prefix “iso” used to designate a process means ______.

• A. Cannot be interchanged
• B. Remains constant
• C. Approximately equal
• D. Slight difference

42. What does the term “steady” implies?

• A. No change with volume
• B. No change with time
• C. No change with location
• D. No change with mass

43. What does the tem “uniform” implies?

• A. No change with volume
• B. No change with time
• C. No change with location
• D. No change with mass

44. What is defined as a process during which a fluid flows through a control volume steadily?

• A. Transient-flow process
• B. Steady and uniform process
• C. Uniform-flow process

45. The sum of all the microscopic form of energy is called _____.

• A. Total energy
• B. Internal energy
• C. System energy
• D. Phase energy

46. What type of system energy is related to the molecular structure of a system?

• A. Macroscopic form of energy
• B. Microscopic form of energy
• C. Internal energy
• D. External energy

47. What form of energy refers to those a system possesses as a whole with respect to some outside reference frame, such as potential and kinetic energies?

• A. Macroscopic form of energy
• B. Microscopic form of energy
• C. Internal energy
• D. External energy

48. Who coined the word “energy” in 1807?

• A. William Rankine
• B. Rudolph Clausius
• C. Lord Kelvin
• D. Thomas Young

49. The molecules of a gas moving through space with some velocity possesses what kind of energy?

• A. Translational energy
• B. Spin energy
• C. Rotational kinetic energy
• D. Sensible energy

50. The electrons in an atom which rotate about the nucleus possess what kind of energy?

• A. Translational energy
• B. Spin energy
• C. Rotational kinetic energy
• D. Sensible energy

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