Claude gas liquefaction process employs cooling___________________?
(A) At constant pressure
(B) By throttling
(C) By expansion in an engine
(D) None of these
Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be___________________?
(A) Same
(B) Doubled
(C) Halved
(D) One fourth of its original value
The activity of an ideal gas is numerically ____________ its pressure?
(A) More than
(B) Less than
(C) Equal to
(D) Data insufficient, can’t be predicted
Any substance above its critical temperature exists as _____________________?
(A) Saturated vapour
(B) Solid
(C) Gas
(D) Liquid
Clausius-Clapeyron Equation gives accurate result, when the __________________?
(A) Vapour pressure is relatively low and the temperature does not vary over wide limits
(B) Vapour obeys the ideal gas law and the latent heat of vaporisation is constant
(C) Volume in the liquid state is negligible compared with that in the vapour state
(D) All A,
In polytropic process (PVn = constant), if n = 1; it means a/an ______________ process?
(A) Adiabatic
(B) Reversible
(C) Isothermal
(D) None of these
Which of the following equations is obtained on combining 1st and 2nd law of thermodynamics, for a system of constant mass ?
(A) dE = Tds – PdV
(B) dQ = CvdT + PdV
(C) dQ = CpdT + Vdp
(D) Tds = dE – PdV
The internal energy of a gas obeying P (V – b) RT (where, b is a positive constant and has a constant Cv), depends upon its________________?
(A) Pressure
(B) Volume
(C) Temperature
(D) All A,
If the pressure on 100 c.c. of air is halved, then its volume (at the same temperature) would be ______________ c.c?
(A) 100
(B) 50
(C) 205
(D) 200
All gases above its inversion temperature, in a throttling process will show__________________?
(A) A heating effect
(B) No change in temperature
(C) A cooling effect
(D) Either