A. Sublimation
B. Fusion
C. Transition
D. Vaporisation
✅ The correct answer is option C.
Thermodynamics MCQs
1m³ of an ideal gas at 500 K and 1000 kPa expands reversibly to 5 times its initial volume in an insulated container. If the specific heat capacity (at constant pressure) of the gas is 21 J/mole . K, the final temperature will be
A. 35 K
B. 174 K
C. 274 K
D. 154 K
✅ The correct answer is option C.
For an ideal gas, the enthalpy
A. Increases with rise in pressure
B. Decreases with rise in pressure
C. Is independent of pressure
D. Is a path function
✅ The correct answer is option C.
If heat contents of CH₄, C₂H₄ and C₃H₈ are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH₄(g) + C₂H₄(g) ⇋ C₃H₈(g) will be __________ Kcal.
A. -19.4
B. -30.2
C. 55.2
D. -55.2
✅ The correct answer is option A.
The value of Joule-Thomson co-efficient, in case where cooling occurs after the throttling process is
A. 0
B. ∞
C. +ve
D. -ve
✅ The correct answer is option C.
A refrigerator works on the principle of __________ law of thermodynamics.
A. Zeroth
B. First
C. Second
D. Third
✅ The correct answer is option C.
The chemical potential for a pure substance is __________ its partial molal free energy.
A. More than
B. Less than
C. Equal to
D. Not related to
✅ The correct answer is option C.
Linde gas liquefaction process employs cooling
A. By throttling
B. By expansion in an engine
C. At constant pressure
D. None of these
✅ The correct answer is option A.
The relation connecting the fugacities of various components in a solution with one another and to composition at constant temperature and pressure is called the __________ equation.
A. Gibbs-Duhem
B. Van Laar
C. Gibbs-Helmholtz
D. Margules
✅ The correct answer is option A.
In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in
A. Enhanced COP
B. Decreased COP
C. No change in the value of COP
D. Increased or decreased COP ; depending upon the type of refrigerant
✅ The correct answer is option A.