1
GATE ME 2008
+1
-0.3
$$2$$ moles of oxygen are mixed adiabatically with another $$2$$ moles of oxygen in mixing chamber, so that the final total pressure and temperature of the mixture become same as those of the individual constituents at, their initial states. The universal gas constant is given as $$R$$. The change in entropy due to mixing, per mole of oxygen, is given by
A
$$-R$$ $$ln2$$
B
$$0$$
C
$$R$$ $$ln2$$
D
$$R$$ $$ln4$$
2
GATE ME 2007
+1
-0.3
Which of the following relationships is valid only for reversible process undergone by a closed system of simple compressible substance (neglect changes in kinetic and potential energy?
A
$$\delta Q = dU + \delta W$$
B
$$T\,\,dS = dU + p\,dv$$
C
$$T\,\,dS = dU + \delta W$$
D
$$\delta Q = dU + p\,\,dv$$
3
GATE ME 1997
+1
-0.3
For an ideal gas the expression $$\left[ {T{{\left( {{{\delta s} \over {\delta T}}} \right)}_p} - T{{\left( {{{\delta s} \over {\delta T}}} \right)}_v}} \right]$$ is always equal to :
A
Zero
B
$${C_p}/{C_v}$$
C
$$R$$
D
$$RT$$
4
GATE ME 1997
+1
-0.3
A system undergoes a state change from $$1$$ to $$2.$$ According to the second law of thermodynamics, for the process to be feasible, the entropy changes, $${S_2} - {S_1}$$ of the system
A
is positive or zero
B
is negative or zero
C
is zero
D
can be positive, negative or zero
GATE ME Subjects
EXAM MAP
Medical
NEET