A. Low T, low P
B. High T, high P
C. Low T, high P
D. High T, low P
✅ The correct answer is option D.
Thermodynamics MCQs
Duringthe phase transition, __________ changes.
A. Pressure
B. Volume
C. Temperature
D. All of the above
✅ The correct answer is option B.
The extensive properties are
A. Volume, mass and number of moles
B. Free energy, entropy and enthalpy
C. Both A and B
D. None of these
✅ The correct answer is option C.
Pick out the undesirable property for a good refrigerant.
A. High thermal conductivity
B. Low freezing point
C. Large latent heat of vaporisation
D. High viscosity
✅ The correct answer is option D.
Fugacity co-efficient of a substance is the ratio of its fugacity to
A. Mole fraction
B. Activity
C. Pressure
D. Activity co-efficient
✅ The correct answer is option C.
The thermodynamic law, PVy = constant, is not applicable in case of
A. Ideal compression of air
B. Free expansion of an ideal gas
C. Adiabatic expansion of steam in a turbine
D. Adiabatic compression of a perfect gas
✅ The correct answer is option B.
If the vapour pressure at two temperatures of a solid phase in equilibrium with its liquid phase are known, then the latent heat of fusion can be calculated by the
A. Maxwell’s equation
B. Clayperon-Claussius equation
C. Van Laar equation
D. Nernst Heat Theorem
✅ The correct answer is option B.
4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is
A. 4 J
B. ∞
C. 0
D. 8 J
✅ The correct answer is option C.
The reaction A (l) R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The number of degrees of freedom are
A. 1
B. 2
C. 3
D. 0
✅ The correct answer is option B.
A liquid under pressure greater than its vapour pressure for the temperature involved is called a __________ liquid.
A. Subcooled
B. Saturated
C. Non-solidifiable
D. None of these
✅ The correct answer is option A.