21) For reversible adiabatic process, change in entropy is
a) maximum
b) minimum
c) zero
d) unpredictable
22) Which of the following is not a conserved quantity ?
a) Mass
b) Energy
c) Momentum
d) Exergy
23) Which of the following thermodynamic relation is Keenan function ?
a) U + PV
b) H – T0 S
c) E – T0 S
d) U – T0 S
24) The slope of sublimation curve on P-T diagram for all substances is
a) zero
b) infinite
c) positive
d) negative
25) Triple point is the point in
a) p-V diagram
b) p-T diagram
c) h-S diagram
d) T-S diagram
26) A gas which obeys kinetic theory perfectly is known as
a) Perfect gas
b) Real gas
c) Monoatomic gas
d) Diatomic gas
27) For an ideal gas the value of Joule Thomson coefficient is
a) zero
b) 0.5
c) unity
d) infinite
28) In the van der Waal’s equation, the unit of constant a is
a) N m5
b) N m2
c) N m3
d) N m4
29) Gibb’s free energy (G) is given by
a) G = H – TS
b) G =H/TS
c) G = U – TS
d) None of these
30) The clausius-clapeyron equation gives the slope of a curve in
a) p-V diagram
b) P-h diagram
c) p-T diagram
d) T-s diagram
Best Of Luck!!