1
JEE Main 2023 (Online) 31st January Morning Shift
+4
-1

The pressure of a gas changes linearly with volume from $$\mathrm{A}$$ to $$\mathrm{B}$$ as shown in figure. If no heat is supplied to or extracted from the gas then change in the internal energy of the gas will be

A
6 J
B
4.5 J
C
zero
D
$$-$$4.5 J
2
JEE Main 2023 (Online) 31st January Morning Shift
+4
-1

The correct relation between $$\gamma = {{{c_p}} \over {{c_v}}}$$ and temperature T is :

A
$$\gamma \propto T$$
B
$$\gamma \propto {1 \over {\sqrt T }}$$
C
$$\gamma \propto {1 \over T}$$
D
$$\gamma \propto T^\circ$$
3
JEE Main 2023 (Online) 30th January Evening Shift
+4
-1
Given below are two statements: one is labelled as Assertion $\mathbf{A}$ and the other is labelled as Reason $\mathbf{R}$

Assertion A: Efficiency of a reversible heat engine will be highest at $-273^{\circ} \mathrm{C}$ temperature of cold reservoir.

Reason R: The efficiency of Carnot's engine depends not only on the temperature of the cold reservoir but it depends on the temperature of the hot reservoir too and is given as $\eta=\left(1-\frac{T_{2}}{T_{1}}\right)$

In the light of the above statements, choose the correct answer from the options given below
A
Both $\mathbf{A}$ and $\mathbf{R}$ are true and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$
B
Both $\mathbf{A}$ and $\mathbf{R}$ are true but $\mathbf{R}$ is NOT the correct explanation of $\mathbf{A}$
C
A is false but $\mathbf{R}$ is true
D
A is true but $\mathbf{R}$ is false
4
JEE Main 2023 (Online) 30th January Evening Shift
+4
-1
A flask contains hydrogen and oxygen in the ratio of $2: 1$ by mass at temperature $27^{\circ} \mathrm{C}$. The ratio of average kinetic energy per molecule of hydrogen and oxygen respectively is:
A
1 : 1
B
4 : 1
C
1 : 4
D
2 : 1
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
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Trigonometry
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