1
NEET 2013 (Karnataka)
+4
-1
Which of the following relations does not give the equation of an adiabatic process, where terms have their usual meaning?
A
P1$$-$$$$\gamma$$ T$$\gamma$$  =  constant
B
PV$$\gamma$$   =  constant
C
TV$$\gamma$$$$-$$1  =  constant
D
P$$\gamma$$  T1$$-$$$$\gamma$$  =  constant
2
NEET 2013 (Karnataka)
+4
-1
A system is taken from state a to state c by two paths adc and abc as shown in the figure. The internal energy at a is $${U_a} = 10\,J$$. Along the path adc the amount of heat absorbed dQ1 $$=$$ 50 J and the work obtained dW1 $$=$$ 20 J whereas along the path abc the heat absorbed dQ2 = 36 J. The amount of work allong the path abc is

A
10 J
B
12 J
C
36 J
D
6 J
3
NEET 2013 (Karnataka)
+4
-1
Two Carnot engines A and B are operated in series. The engine A receives heat from the source at temperature T1 and rejects the heat to the sink at temperature T. The second engine B receives the heat at temperature T and rejects to its sink at temperature T2. For what values of T the efficiencies of the two engines are equal
A
$${{{T_1} - {T_2}} \over 2}$$
B
$${T_1}{T_2}$$
C
$$\sqrt {{T_1}{T_2}}$$
D
$${{{T_1} + {T_2}} \over 2}$$
4
NEET 2013 (Karnataka)
+4
-1
In a vessel, the gas is at pressure P. If the mass of all the molecules is halved and their speed is doubled, then the resultant pressure will be
A
2P
B
P
C
P/2
D
4P
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