A. P + F – C = 2
B. C = P – F + 2
C. F = C – P – 2
D. P = F – C – 2
✅ The correct answer is option A.
Thermodynamics MCQs
Critical temperature is defined as the temperature above which a gas will
A. Not liquify (barring exceptions)
B. Immediately liquify
C. Never liquify however high the pressure may be
D. None of these
✅ The correct answer is option C.
When liquid and vapour phase of multi-component system are in equilibrium (at a given temperature and pressure), then chemical potential of each component is
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.
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.
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.
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.
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.
Entropy change of the reaction, H₂O(liquid) H₂O(gas), is termed as the enthalpy of
A. Solution
B. Vaporisation
C. Formation
D. Formation
✅ The correct answer is option B.
Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the
A. Two temperatures only
B. Pressure of working fluid
C. Mass of the working fluid
D. Mass and pressure both of the working fluid
✅ The correct answer is option A.
The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible __________ process.
A. Isobaric
B. Isothermal
C. Adiabatic
D. None of these
✅ The correct answer is option B.