THERMODYNAMICS MCQ SET 1
Q1. Which of the following is a thermodynamic property?
A) Pressure
B) Volume
C) Temperature
D) All of the above
Answer: D) All of the above
Explanation: Pressure, volume, and temperature are all measurable properties that define a thermodynamic system.
Q2. The first law of thermodynamics is based on the law of:
A) Conservation of momentum
B) Conservation of energy
C) Conservation of mass
D) Conservation of entropy
Answer: B) Conservation of energy
Explanation: Energy can neither be created nor destroyed; it only changes its form.
Q3. In an adiabatic process, there is no:
A) Work transfer
B) Heat transfer
C) Change in pressure
D) Change in temperature
Answer: B) Heat transfer
Explanation: Adiabatic process means no heat is exchanged with surroundings.
Q4. A process in which pressure remains constant is called:
A) Isochoric
B) Isobaric
C) Isothermal
D) Adiabatic
Explanation: โIsobaricโ means constant pressure throughout the process.
Q5. The unit of entropy is:
A) kJ/kg
B) kJ/kgยทK
C) J/kg
D) kcal/kg
Answer: B) J/kgยทK
Explanation:
Entropy measures energy dispersal per unit temperature per unit mass.
Q6. The Zeroth law of thermodynamics defines:
A) Energy conservation
B) Temperature
C) Entropy
D) Work done
Answer: B) Temperature
Explanation: It states that if two bodies are each in thermal equilibrium with a third body, they are in thermal equilibrium with each other.
Q7. The process with constant volume is known as:
A) Isochoric
B) Isothermal
C) Isobaric
D) Adiabatic
Answer: A) Isochoric
Explanation: In an isochoric process, volume remains constant, so no work is done.
Q8. Which cycle is used in a steam power plant?
A) Otto cycle
B) Diesel cycle
C) Rankine cycle
D) Brayton cycle
Answer: C) Rankine cycle
Explanation: Rankine cycle is used in thermal power plants to convert heat into work.
Q9. The device that converts heat energy into mechanical work is called:
A) Compressor
B) Turbine
C) Heat engine
D) Pump
Answer: C) Heat engine
Explanation: A heat engine converts heat energy into mechanical energy.
Q10. The efficiency of a Carnot engine depends on:
A) Working fluid
B) Temperatures of source and sink
C) Pressure ratio
D) Type of fuel
Answer: B) Temperatures of source and sink
Explanation: Efficiency increases when the temperature difference between source and sink increases.
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