JEE Main 2023 Question Paper (08-Apr-2023) (Shift 2)

Question 1

The power radiated from a linear antenna of length $l$ is proportional to (Given, $\lambda =$ Wavelength of wave):

Accepted Answer

${\left(\frac{l}{\lambda}\right)}^{2}$

Answer

$\frac{l}{\lambda}$

Answer

$ \frac{l}{\lambda^{2}} $

Answer

$ \frac{l^{2}}{\lambda} $

Question 2

The width of fringe is $2 \mathrm{mm}$ on the screen in a double slit experiment for the light of wavelength $400 \mathrm{nm}$. The width of the fringe for the light of wavelength $600 \mathrm{nm}$ will be:

Accepted Answer

$3 \mathrm{mm}$

Answer

$4 \mathrm{mm}$

Answer

$2 \mathrm{mm}$

Answer

$1.33 \mathrm{mm}$

Question 3

The trajectory of a projectile, projected from the ground, is given by $ y = x - \frac{x^{2}}{20} $, where $ x $ and $ y $ are measured in meters. The maximum height attained by the projectile will be.

Accepted Answer

$5 \mathrm{m}$

Answer

$200 \mathrm{m}$

Answer

$10 \mathrm{m}$

Answer

$10\sqrt{2} \quad \mathrm{m}$

Question 4

The orbital angular momentum of a satellite is $ \mathrm{L} $, when it is revolving in a circular orbit at height $ \mathrm{h} $ from the Earth's surface. If the distance of the satellite from the Earth's centre is increased by eight times its initial value, then the new angular momentum will be

Accepted Answer

$3 \quad \mathrm{L}$

Answer

$8 \quad \mathrm{L}$

Answer

$9 \quad \mathrm{L}$

Answer

$4 \quad \mathrm{L}$

Question 5

Given below are two statements: one is labelled as Assertion $\mathbf{A}$ and the other is labelled as Reason $\mathbf{R}$.
Assertion A: Electromagnets are made of soft iron.
Reason R: Soft iron has high permeability and low retentivity.
In the light of above statements, choose the most appropriate answer from the options given below.

Accepted Answer

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

Answer

$ \mathbf{A}$ is not correct but $ \mathbf{R}$ is correct

Answer

$ \mathbf{A}$ is correct but $ \mathbf{R}$ is not correct

Answer

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