A. Path
B. Point
C. State
D. None of these
✅ The correct answer is option A.
Thermodynamics MCQs
462. Internal energy change of a system over one complete cycle in a cyclic process is
A. Zero
B. +ve
C. -ve
D. Dependent on the path
✅ The correct answer is option A.
463. The temperature at which both liquid and gas phases are identical, is called the __________ point.
A. Critical
B. Triple
C. Freezing
D. Boiling
✅ The correct answer is option A.
464. For a constant volume process
A. dE = CpdT
B. dE = CvdT
C. dQ = dE + pdV
D. dW = pdV
✅ The correct answer is option B.
465. __________ equation predicts the activity co-efficient from experimental data.
A. Lewis-Randall
B. Margules
C. Van Laar
D. Both B & C
✅ The correct answer is option D.
466. Which of the following is Virial equation of state?
A. (p + a/V²)(V – b) = nRT
B. PV = nRT
C. PV = A + B/V + C/V² + D/V³ + …
D. None of the above
✅ The correct answer is option C.
467. The entropy change in a reversible isothermal process, when an ideal gas expands to four times its initial volume is
A. R loge 4
B. R log10 4
C. Cv log10 4
D. Cv loge 4
✅ The correct answer is option A.
468. Heat of reaction is
A. Dependent on pressure only
B. Dependent on temperature only
C. Dependent on both pressure and temperature
D. Independent of temperature changes
✅ The correct answer is option C.
469. The number of degree of freedom for an azeotropic mixture of ethanol and water in vapour-liquid equilibrium, is
A. 3
B. 1
C. 2
D. 0
✅ The correct answer is option B.
470. Claude’s liquefaction process employs the cooling of gases by
A. Expansion in an engine
B. Following a constant pressure cycle
C. Throttling
D. None of these
✅ The correct answer is option A.