A. Reversible isothermal
B. Irreversible isothermal
C. Reversible adiabatic
D. None of these
✅ The correct answer is option C.
Engineering
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4222. Entropy change for an irreversible isolated system is
A. ∞
B. 0
C. < 0
D. > 0
✅ The correct answer is option D.
4223. Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporisation etc.).
A. Entropy
B. Internal energy
C. Enthalpy
D. Gibbs free energy
✅ The correct answer is option D.
4224. Partial molal quantities are important in the study of
A. Ideal gases
B. Ideal solutions
C. Non-ideal mixtures
D. A pure component
✅ The correct answer is option C.
4225. Second law of thermodynamics is concerned with the
A. Amount of energy transferred
B. Direction of energy transfer
C. Irreversible processes only
D. Non-cyclic processes only
✅ The correct answer is option B.
4226. Gibbs-Duhem equation relates composition in liquid phase and the __________ at constant temperature & pressure.
A. Fugacity
B. Partial pressure
C. Activity co-efficient
D. A, B, and C
✅ The correct answer is option D.
4227. Kopp’s rule is used to calculate the heat capacity of
A. Solids
B. Liquids
C. Gases
D. All of the above
✅ The correct answer is option A.
4228. A solid is transformed into vapour without going to the liquid phase at
A. Triple point
B. Boiling point
C. Below triple point
D. Always
✅ The correct answer is option A.
4229. With increase in compression ratio, the efficiency of the otto engine
A. Increases
B. Decreases
C. Remains constant
D. Increases linearly
✅ The correct answer is option A.
4230. Free energy changes for two reaction mechanism ‘X’ and ‘Y are respectively – 15 and – 5 units. It implies that X is
A. Slower than Y
B. Faster than Y
C. Three times slower than Y
D. Three times faster than Y
✅ The correct answer is option B.