4071. Sound waves propagation in air exemplifies an __________ process.
A. Adiabatic
B. Isothermal
C. Isometric
D. None of these
✅ The correct answer is option A.
Chemical Engineering
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4072. At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero. This follows from the
A. Third law of thermodynamics
B. Second law of thermodynamics
C. Nernst heat theorem
D. Maxwell’s relations
✅ The correct answer is option A.
4073. Entropy of the system decreases, when
A. Snow melts into water
B. A gas expands spontaneously from high pressure to low pressure
C. Water is converted into ice
D. Both B & C
✅ The correct answer is option D.
4074. Fugacity is a measure of the
A. Escaping tendencies of the same substance in different phases of a system
B. Relative volatility of a mixture of two miscible liquids
C. Behaviour of ideal gases
D. None of these
✅ The correct answer is option A.
4075. The point at which all the three (solid, liquid and gas) phases co-exist, is known as the __________ point.
A. Freezing
B. Triple
C. Boiling
D. Boyle
✅ The correct answer is option B.
4076. What is the degree of freedom for two mis-cible (non-reacting) substances in vapor-liquid equilibrium forming an azeotrope?
A. 0
B. 1
C. 2
D. 3
✅ The correct answer is option C.
4077. Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favoured by the
A. Low pressure and high temperature
B. Low pressure and low temperature
C. High pressure and low temperature
D. High pressure and high temperature
✅ The correct answer is option B.
4078. The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is
A. (∂T/∂V)S = -(∂P/∂S)V
B. (∂S/∂P)T = -(∂V/∂T)P
C. (∂V/∂S)P = (∂T/∂P)S
D. (∂S/∂V)T = (∂P/∂T)V
✅ The correct answer is option D.
4079. Absolute zero temperature signifies the
A. Minimum temperature attainable
B. Temperature of the heat reservoir to which a Carnot engine rejects all the heat that is taken in
C. Temperature of the heat reservoir to which a Carnot engine rejects no heat
D. None of these
✅ The correct answer is option C.
4080. Cv is given by
A. (∂E/∂T)V
B. (∂E/∂V)T
C. (∂E/∂P)V
D. (∂V/∂T)P
✅ The correct answer is option A.