1

JEE Main 2021 (Online) 25th February Evening Shift

Numerical

+4

-1

Out of Syllabus

A reversible heat engine converts one-fourth of the heat input into work. When the temperature of the sink is reduced by 52K, its efficiency is doubled. The temperature in Kelvin of the source will be __________.

Your input ____

2

JEE Main 2021 (Online) 25th February Morning Shift

Numerical

+4

-1

A monoatomic gas of mass 4.0 u is kept in an insulated container. Container is moving with velocity 30 m/s. If container is suddenly stopped then change in temperature of the gas (R = gas constant) is $${x \over {3R}}$$. Value of x is ___________.

Your input ____

3

JEE Main 2021 (Online) 25th February Morning Shift

Numerical

+4

-1

In a certain thermodynamical process, the pressure of a gas depends on its volume as kV

^{3}. The work done when the temperature changes from 100$$^\circ$$C to 300$$^\circ$$C will be ___________ nR, where n denotes number of moles of a gas.Your input ____

4

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 _________.Your input ____

Questions Asked from Heat and Thermodynamics (Numerical)

Number in Brackets after Paper Indicates No. of Questions

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