4061. Third law of thermodynamics is concerned with the
A. Value of absolute entropy
B. Energy transfer
C. Direction of energy transfer
D. None of these
✅ The correct answer is option A.
Chemical Engineering
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4062. Solid and liquid phases of a substance are in equilibrium at the
A. Critical temperature
B. Melting point
C. Freezing point
D. Both B and C
✅ The correct answer is option D.
4063. Lenz’s law results from the law of conservation of
A. Mass
B. Momentum
C. Energy
D. None of these
✅ The correct answer is option C.
4064. A system in which there is exchange of energy but not of mass, is called a/an __________ system.
A. Isolated
B. Open
C. Insulated
D. Closed
✅ The correct answer is option D.
4065. Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of
A. Fusion
B. Vaporisation
C. Transition
D. None of these
✅ The correct answer is option C.
4066. Ideal refrigeration cycle is
A. Same as Carnot cycle
B. Same as reverse Carnot cycle
C. Dependent on the refrigerant’s properties
D. The least efficient of all refrigeration processes
✅ The correct answer is option B.
4067. In an ideal gas mixture, fugacity of a species is equal to its
A. Vapor pressure
B. Partial pressure
C. Chemical potential
D. None of these
✅ The correct answer is option B.
4068. The unit of equilibrium constant of a chemical reaction is the same as that of
A. Molar concentration
B. Temperature
C. Internal energy
D. None of these
✅ The correct answer is option D.
4069. Which of the following exemplifies an adiabatic process?
A. Melting of ice
B. Condensation of alcohol vapor
C. Sudden bursting of a cycle tube
D. Evaporation of water
✅ The correct answer is option C.
4070. Pick out the correct statement:
A. In an isothermal system, irreversible work is more than reversible work
B. Under reversible conditions, the adiabatic work is less than isothermal work
C. Heat, work, enthalpy and entropy are all ‘state functions’
D. Matter and energy can not be exchanged with the surroundings in a closed system
✅ The correct answer is option B.