1
JEE Main 2021 (Online) 24th February Evening Shift
Numerical
+4
-1
The root mean square speed of molecules of a given mass of a gas at 27$$^\circ$$C and 1 atmosphere pressure is 200 ms$$-$$1. The root mean square speed of molecules of the gas at 127$$^\circ$$C and 2 atmosphere pressure is $${{x \over {\sqrt 3 }}}$$ ms$$-$$1. The value of x will be _________.
2
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 __________.
3
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 ________.
4
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 _________.

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