1
JEE Main 2020 (Online) 6th September Evening Slot
Numerical
+4
-0
An engine operates by taking a monoatomic ideal gas through the cycle shown in the figure. The percentage efficiency of the engine is close to __________.
2
JEE Main 2020 (Online) 6th September Morning Slot
Numerical
+4
-0
Initially a gas of diatomic molecules is contained in a cylinder of volume V1 at a pressure P1 and temperature 250 K. Assuming that 25% of the molecules get dissociated causing a change in number of moles. The pressure of the resulting gas at temperature 2000 K, when contained in a volume 2V1 is given by P2 . The ratio $${{{P_2}} \over {{P_1}}}$$ is ________.
3
JEE Main 2020 (Online) 6th September Morning Slot
Numerical
+4
-0
A part of a complete circuit is shown in the figure. At some instant, the value of current I is 1A and it is decreasing at a rate
of 102 A s–1. The value of the potential difference VP – VQ , (in volts) at that instant, is _________.

4
JEE Main 2020 (Online) 5th September Evening Slot
Numerical
+4
-0
Nitrogen gas is at 300oC temperature. The temperature (in K) at which the rms speed of a H2 molecule would be equal to the rms speed of a nitrogen molecule, is _______.
(Molar mass of N2 gas 28 g).
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