MECH502 Exam Questions And Answers
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1. The first law of thermodynamics is a statement of:
A. Conservation of mass
B. Conservation of energy
C. Conservation of momentum
D. Conservation of charge
Correct Answer: B
Rationale: The first law of thermodynamics is a statement of conservation of energy,
which states that energy cannot be created or destroyed, only converted from one form
to another.
2. Which of the following is a state function?
A. Heat
B. Work
C. Enthalpy
D. Energy transfer
Correct Answer: C
Rationale: Enthalpy is a state function because its value depends only on the current
state of the system, not on the path taken to reach that state. Heat and work are path
functions.
3. The second law of thermodynamics states that:
A. Energy is conserved
B. Entropy of an isolated system always increases
C. Pressure and temperature are related
D. Work is always greater than heat
Correct Answer: B
Rationale: The second law states that the entropy of an isolated system always
increases or remains constant over time.
,4. Which of the following is a thermodynamic property?
A. Temperature
B. Pressure
C. Volume
D. All of the above
Correct Answer: D
Rationale: Temperature, pressure, and volume are all thermodynamic properties.
5. The ideal gas law is given by:
A. PV = nRT
B. PV = RT
C. PV = mRT
D. All of the above
Correct Answer: D
Rationale: The ideal gas law can be written as PV = nRT (moles), PV = mRT (mass), or PV
= RT (specific).
6. Which of the following is a thermodynamic process?
A. Isothermal
B. Isobaric
C. Isochoric
D. All of the above
Correct Answer: D
Rationale: Isothermal (constant temperature), isobaric (constant pressure), and isochoric
(constant volume) are all thermodynamic processes.
7. An isothermal process is one in which:
A. Temperature is constant
B. Pressure is constant
C. Volume is constant
D. Entropy is constant
Correct Answer: A
Rationale: An isothermal process occurs at constant temperature.
, 8. An isobaric process is one in which:
A. Temperature is constant
B. Pressure is constant
C. Volume is constant
D. Entropy is constant
Correct Answer: B
Rationale: An isobaric process occurs at constant pressure.
9. An isochoric process is one in which:
A. Temperature is constant
B. Pressure is constant
C. Volume is constant
D. Entropy is constant
Correct Answer: C
Rationale: An isochoric process occurs at constant volume.
10. Which of the following is a type of thermodynamic cycle?
A. Carnot cycle
B. Rankine cycle
C. Otto cycle
D. All of the above
Correct Answer: D
Rationale: The Carnot, Rankine, and Otto cycles are all thermodynamic cycles.
11. The Carnot cycle consists of which processes?
A. Two isothermal and two adiabatic
B. Two isobaric and two isochoric
C. Two isothermal and two isobaric
D. Two adiabatic and two isochoric
Correct Answer: A
Rationale: The Carnot cycle consists of two isothermal processes and two adiabatic
processes.
12. The thermal efficiency of a Carnot engine depends on:
|Latest 2026/2027 | Guaranteed Pass
1. The first law of thermodynamics is a statement of:
A. Conservation of mass
B. Conservation of energy
C. Conservation of momentum
D. Conservation of charge
Correct Answer: B
Rationale: The first law of thermodynamics is a statement of conservation of energy,
which states that energy cannot be created or destroyed, only converted from one form
to another.
2. Which of the following is a state function?
A. Heat
B. Work
C. Enthalpy
D. Energy transfer
Correct Answer: C
Rationale: Enthalpy is a state function because its value depends only on the current
state of the system, not on the path taken to reach that state. Heat and work are path
functions.
3. The second law of thermodynamics states that:
A. Energy is conserved
B. Entropy of an isolated system always increases
C. Pressure and temperature are related
D. Work is always greater than heat
Correct Answer: B
Rationale: The second law states that the entropy of an isolated system always
increases or remains constant over time.
,4. Which of the following is a thermodynamic property?
A. Temperature
B. Pressure
C. Volume
D. All of the above
Correct Answer: D
Rationale: Temperature, pressure, and volume are all thermodynamic properties.
5. The ideal gas law is given by:
A. PV = nRT
B. PV = RT
C. PV = mRT
D. All of the above
Correct Answer: D
Rationale: The ideal gas law can be written as PV = nRT (moles), PV = mRT (mass), or PV
= RT (specific).
6. Which of the following is a thermodynamic process?
A. Isothermal
B. Isobaric
C. Isochoric
D. All of the above
Correct Answer: D
Rationale: Isothermal (constant temperature), isobaric (constant pressure), and isochoric
(constant volume) are all thermodynamic processes.
7. An isothermal process is one in which:
A. Temperature is constant
B. Pressure is constant
C. Volume is constant
D. Entropy is constant
Correct Answer: A
Rationale: An isothermal process occurs at constant temperature.
, 8. An isobaric process is one in which:
A. Temperature is constant
B. Pressure is constant
C. Volume is constant
D. Entropy is constant
Correct Answer: B
Rationale: An isobaric process occurs at constant pressure.
9. An isochoric process is one in which:
A. Temperature is constant
B. Pressure is constant
C. Volume is constant
D. Entropy is constant
Correct Answer: C
Rationale: An isochoric process occurs at constant volume.
10. Which of the following is a type of thermodynamic cycle?
A. Carnot cycle
B. Rankine cycle
C. Otto cycle
D. All of the above
Correct Answer: D
Rationale: The Carnot, Rankine, and Otto cycles are all thermodynamic cycles.
11. The Carnot cycle consists of which processes?
A. Two isothermal and two adiabatic
B. Two isobaric and two isochoric
C. Two isothermal and two isobaric
D. Two adiabatic and two isochoric
Correct Answer: A
Rationale: The Carnot cycle consists of two isothermal processes and two adiabatic
processes.
12. The thermal efficiency of a Carnot engine depends on:
