1
JEE Main 2020 (Online) 7th January Morning Slot
+4
-1
Two moles of an ideal gas with $${{{C_P}} \over {{C_V}}} = {5 \over 3}$$ are mixed with 3 moles of another ideal gas with $${{{C_P}} \over {{C_V}}} = {4 \over 3}$$. The value of $${{{C_P}} \over {{C_V}}}$$ for the mixture is :
A
1.50
B
1.45
C
1.47
D
1.42
2
JEE Main 2020 (Online) 7th January Morning Slot
+4
-1
A litre of dry air at STP expands adiabatically to a volume of 3 litres. If $$\gamma$$ = 1.40, the work done by air is : (31.4 = 4.6555) [Take air to be an ideal gas]
A
60.7 J
B
100.8 J
C
90.5 J
D
48 J
3
JEE Main 2019 (Online) 12th April Evening Slot
+4
-1
A Carnot engine has an efficiency of $${1 \over 6}$$. When the temperature of the sink is reduced by 62ºC, its efficiency is doubled. The temperatures of the source and the sink are, respectively
A
99oC, 37oC
B
124oC, 62oC
C
37oC, 99oC
D
62oC, 124oC
4
JEE Main 2019 (Online) 12th April Evening Slot
+4
-1
A diatomic gas with rigid molecules does 10 J of work when expanded at constant pressure. What would be the heat energy absorbed by the gas, in this process ?
A
35 J
B
30 J
C
25 J
D
40 J
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