JEE Main 2023 (Online) 31st January Morning Shift | Heat and Thermodynamics Question 79 | Physics

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

Both $\mathbf{A}$ and $\mathbf{R}$ are true and $\mathbf{R}$ is the correct explanation of $\mathbf{A}$

Both $\mathbf{A}$ and $\mathbf{R}$ are true but $\mathbf{R}$ is NOT the correct explanation of $\mathbf{A}$

A is false but $\mathbf{R}$ is true

A is true but $\mathbf{R}$ is false

JEE Main 2023 (Online) 30th January Evening Shift

MCQ (Single Correct Answer)

-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:

1 : 1

4 : 1

1 : 4

2 : 1

JEE Main 2023 (Online) 30th January Morning Shift

MCQ (Single Correct Answer)

-1

The pressure $$(\mathrm{P})$$ and temperature ($$\mathrm{T})$$ relationship of an ideal gas obeys the equation $$\mathrm{PT}^{2}=$$ constant. The volume expansion coefficient of the gas will be :

$$3 T^{2}$$

$$\frac{3}{T^2}$$

$$\frac{3}{T^3}$$

$$\frac{3}{T}$$

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