JEE Main 2023 (Online) 31st January Morning Shift | Heat and Thermodynamics Question 69 | Physics

JEE Main 2023 (Online) 31st January Morning Shift

MCQ (Single Correct Answer)

-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

JEE Main 2023 (Online) 31st January Morning Shift Physics - Heat and Thermodynamics Question 81 English

6 J

4.5 J

zero

$$-$$4.5 J

JEE Main 2023 (Online) 31st January Morning Shift

MCQ (Single Correct Answer)

-1

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

$$\gamma \propto T$$

$$\gamma \propto {1 \over {\sqrt T }}$$

$$\gamma \propto {1 \over T}$$

$$\gamma \propto T^\circ $$

JEE Main 2023 (Online) 30th January Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

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

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