1
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.
2
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
3
JEE Main 2021 (Online) 25th February Morning Shift
+4
-1
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : When a rod lying freely is heated, no thermal stress is developed in it.

Reason R : On heating, the length of the rod increases.

In the light of the above statements, choose the correct answer from the options given below :
A
A is true but R is false
B
A is false but R is true
C
Both A and B are true but R is NOT the correct explanation of A
D
Both A and R are true and R is the correct explanation of A
4
JEE Main 2021 (Online) 25th February Morning Shift
+4
-1
A diatomic gas, having $${C_p} = {7 \over 2}R$$ and $${C_v} = {5 \over 2}R$$, is heated at constant pressure. The ratio dU : dQ : dW :
A
5 : 7 : 3
B
3 : 7 : 2
C
5 : 7 : 2
D
3 : 5 : 2
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