1
JEE Main 2021 (Online) 26th February Evening Shift
+4
-1
The internal energy (U), pressure (P) and volume (V) of an ideal gas are related as U $$=$$ 3PV + 4. The gas is :
A
either monoatomic or diatomic.
B
monoatomic only.
C
polyatomic only.
D
diatomic only.
2
JEE Main 2021 (Online) 26th February Morning Shift
+4
-1
The temperature $$\theta$$ at the junction of two insulating sheets, having thermal resistances R1 and R2 as well as top and bottom temperatures $$\theta$$1 and $$\theta$$2 (as shown in figure) is given by :

A
$${{{\theta _1}{R_2} + {\theta _2}{R_1}} \over {{R_1} + {R_2}}}$$
B
$${{{\theta _1}{R_1} + {\theta _2}{R_2}} \over {{R_1} + {R_2}}}$$
C
$${{{\theta _1}{R_2} - {\theta _2}{R_1}} \over {{R_2} - {R_1}}}$$
D
$${{{\theta _2}{R_2} - {\theta _1}{R_1}} \over {{R_2} - {R_1}}}$$
3
JEE Main 2021 (Online) 25th February Evening Shift
+4
-1
Given below are two statements :

Statement I : In a diatomic molecule, the rotational energy at a given temperature obeys Maxwell's distribution.

Statement II : In a diatomic molecule, the rotational energy at a given temperature equals the translational kinetic energy for each molecule.

In the light of the above statements, choose the correct answer from the options given below :
A
Both Statement I and Statement II are true
B
Both Statement I and Statement II are false
C
Statement I is true but Statement II is false.
D
Statement I is false but Statement II is true.
4
JEE Main 2021 (Online) 25th February Evening Shift
+4
-1
Thermodynamic process is shown below on a P-V diagram for one mole of an ideal gas. If V2 = 2V1 then the ratio of temperature T2/T1 is :

A
$$\sqrt 2$$
B
$${1 \over {\sqrt 2 }}$$
C
$${1 \over 2}$$
D
2
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