Thermodynamics Practice Exams mcq – Set 12

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All questions answers in the last paragraph

Q1. The same volume of all gases would represent their

(A) Densities
(B) Specific weights
(C) Molecular weights
(D) Gas characteristic constants

Q2. According to Avogadro’s law, for a given pressure and temperature, each molecule of a gas

(A) Occupies same volume
(B) Occupies volume proportional to its specific weight
(C) Occupies volume inversely proportional to its molecular weight
(D) Occupies volume inversely proportional to its specific weight

Q3. Entropy change depends on

(A) Heat transfer
(B) Mass transfer
(C) Change of temperature
(D) Thermodynamic state

Q4. The atomic mass of oxygen is

(A) 14
(B) 16
(C) 18
(D) 121

Q5. The efficiency and work ratio of a simple gas turbine cycle are

(A) Very low
(B) Low
(C) High
(D) Very high

Q6. Which law states that the internal energy of a gas is a function of temperature?

(A) Charles’ law
(B) Joule’s law
(C) Boyle’s law
(D) There is no such law

Q7. Mixture of ice and water form a

(A) Closed system
(B) Open system
(C) Isolated system
(D) Heterogeneous system

Q8. For reversible adiabatic process, change in entropy is

(A) Maximum
(B) Minimum
(C) Zero
(D) Negative

Q9. An adiabatic process is one in which

(A) The temperature of the gas changes
(B) No heat enters or leaves the gas
(C) The change in internal energy is equal to the mechanical work done
(D) All of the above

Q10. Which of the following is correct?

(A) Gauge pressure = Absolute pressure + Atmospheric pressure
(B) Absolute pressure = Gauge pressure + Atmospheric pressure
(C) Absolute pressure = Gauge pressure – Atmospheric pressure
(D) Atmospheric pressure = Absolute pressure + Gauge pressure

Q11. The state of a substance whose evaporation from its liquid state is complete, is known as

(A) Perfect gas
(B) Vapour
(C) Steam
(D) Air

Q12. The entropy of water at 0°C is assumed to be

(A) 0
(B) -1
(C) 1
(D) 2

Q13. Carnot cycle has maximum efficiency for

Reversible engine
(B) Irreversible engine
(C) Petrol engine
(D) Diesel engine

Q14. Which of the following is an irreversible cycle?

(A) Carnot
(B) Stirling
(C) Ericsson
(D) None of the above

Q15. Which of the following cycles has maximum efficiency?

(A) Rankine
(B) Stirling
(C) Carnot
(D) Brayton

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