1
GATE ME 2009
MCQ (Single Correct Answer)
+1
-0.3
If a closed system is undergoing an irreversible process, the entropy of the system
A
Must increase
B
Always remains constant
C
Must decrease
D
Can increase, decrease or remain constant
2
GATE ME 2008
MCQ (Single Correct Answer)
+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
$$R$$ $$ln4$$
3
GATE ME 2007
MCQ (Single Correct Answer)
+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
$$\delta Q = dU + p\,\,dv$$
4
GATE ME 1997
MCQ (Single Correct Answer)
+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
$$RT$$
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