1
JEE Main 2020 (Online) 9th January Morning Slot
+4
-1
Consider two ideal diatomic gases A and B at some temperature T. Molecules of the gas A are rigid, and have a mass m. Molecules of the gas B have an additional vibrational mode, and have a mass $${m \over 4}$$ . The ratio of the specific heats ($$C_V^A$$ and $$C_V^B$$ ) of gas A and B, respectively is :
A
7 : 9
B
5 : 7
C
3 : 5
D
5 : 9
2
JEE Main 2020 (Online) 9th January Morning Slot
+4
-1
Which of the following is an equivalent cyclic process corresponding to the thermodynamic cyclic given in the figure ? where, 1 $$\to$$ 2 is adiabatic.
(Graphs are schematic and are not to scale)
A
B
C
D
3
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
4
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
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