1
JEE Main 2020 (Online) 8th January Evening Slot
+4
-1
A carnot engine having an efficiency of $${1 \over {10}}$$ is being used as a refrigerator. If the work done on the refrigerator is 10 J, the amount of heat absorbed from the reservoir at lower temperature is :
A
90 J
B
99 J
C
1 J
D
100 J
2
JEE Main 2020 (Online) 8th January Evening Slot
+4
-1
Consider a mixture of n moles of helium gas and 2n moles of oxygen gas (molecules taken to be rigid) as an ideal gas. Its CP/CV value will be :
A
23/15
B
67/45
C
40/27
D
19/13
3
JEE Main 2020 (Online) 8th January Morning Slot
+4
-1
The plot that depicts the behavior of the mean free time t (time between two successive collisions) for the molecules of an ideal gas, as a function of temperature (T), qualitatively, is:
(Graphs are schematic and not drawn to scale)
A
B
C
D
4
JEE Main 2020 (Online) 8th January Morning Slot
+4
-1
A thermodynamic cycle xyzx is shown on a V-T diagram. The P-V diagram that best describes this cycle is :
(Diagrams are schematic and not to scale)
A
B
C
D
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