A. Same in both the phases
B. Zero in both the phases
C. More in vapour phase
D. More in liquid phase
✅ The correct answer is option A.
Thermodynamics MCQs
52. Requisites of a reversible process is that the
A. System and surroundings pressure be equal
B. Friction in the system should be absent
C. System and surroundings temperature be equal
D. None of these
✅ The correct answer is option B.
53. What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor?
A. 2
B. 0
C. 3
D. 1
✅ The correct answer is option A.
54. If atmospheric temperature and dew point are nearly equal, then the relative humidity is
A. Zero
B. 50%
C. Almost 100%
D. Unpredictable
✅ The correct answer is option C.
55. For an isothermal process, the internal energy of a gas
A. Increases
B. Decreases
C. Remains unchanged
D. Data insufficient, can’t be predicted
✅ The correct answer is option C.
56. Which of the following equations is used for the prediction of activity co-efficient from experiments?
A. Van Laar equation
B. Margules equation
C. Wilson’s equation
D. All of the above
✅ The correct answer is option D.
57. Which of the following is not an equation of state?
A. Bertholet equation
B. Clausius Clayperon equation
C. Beattie-Bridgeman equation
D. None of these
✅ The correct answer is option B.
58. Work done in case of free expansion is
A. Indeterminate
B. Zero
C. Negative
D. None of these
✅ The correct answer is option B.
59. For organic compounds, group contribution method can be used for the estimation of
A. Critical properties
B. Specific gravity
C. Specific volume
D. Thermal conductivity
✅ The correct answer is option A.
60. The effect of changing the evaporator temperature on COP as compared to that of changing the condenser temperature (in vapour compression refrigeration system) is
A. Less pronounced
B. More pronounced
C. Equal
D. Data insufficient, can’t be predicted
✅ The correct answer is option B.