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.
4084. Which of the following is not correct for a reversible adiabatic process?
A. TVγ-1 = constant
B. P1-γ.TY = constant
C. PVγ = constant
D. None of these
✅ The correct answer is option D.
4089. All gases except __________ shows a cooling effect during throttling process at atmospheric temperature and pressure.
A. Oxygen
B. Nitrogen
C. Air
D. Hydrogen
✅ The correct answer is option D.
4093. Which of the following liquid metals has the highest thermal conductivity?
A. Molten sodium
B. Molten lead
C. Mercury
D. Molten potassium
✅ The correct answer is option A.
4055. Degree of freedom of the system ice-water-vapour will be
A. 0
B. 1
C. 2
D. 3
✅ The correct answer is option A.
4059. Isotherm on an enthalpy-concentration diagram, for an ideal solution will be a
A. Straight line
B. Sine curve
C. Parabola
D. Hyperbola
✅ The correct answer is option A.
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.
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.
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.
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.