1
JEE Main 2020 (Online) 7th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Two ideal Carnot engines operate in cascade (all heat given up by one engine is used by the other
engine to produce work) between temperature, T1
and T2
. The temperature of the hot reservoir of
the first engine is T1
and the temperature of the cold reservoir of the second engine is T2
. T is
temperature of the sink of first engine which is also the source for the second which is also the
source for the second engine. How is T related to T1
and T2
. If both engines perform equal amount
of work?
2
JEE Main 2020 (Online) 7th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Under an adiabatic process, the volume of an ideal gas gets doubled. Consequently the mean
collision time between the gas molecule changes from $${\tau _1}$$
to $${\tau _2}$$
. If $${{{C_p}} \over {{C_v}}} = \gamma $$ for this gas then a good
estimate for $${{{\tau _2}} \over {{\tau _1}}}$$
is given by :
3
JEE Main 2020 (Online) 7th January Morning Slot
MCQ (Single Correct Answer)
+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 :
4
JEE Main 2020 (Online) 7th January Morning Slot
MCQ (Single Correct Answer)
+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]
Questions Asked from Heat and Thermodynamics (MCQ (Single Correct Answer))
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