NEET Electromagnetic Waves PYQ practice sheet

13 previous-year NEET Physics questions from Electromagnetic Waves, newest papers first. Electromagnetic Waves carries 14 of the Physics questions in NEET 2020 to 2026, so this is a good place to test yourself after revising the chapter. Marking: +4 correct, −1 wrong.

Practise all 13 online

1.
RE-NEET 2026
An electromagnetic wave travelling in a lossless dielectric medium having a dielectric constant, $\varepsilon_r = 9$ , has the electric field, $E_x = E_0\sin(kz - 2\pi\times10^6 t)\ \mathrm{Vm^{-1}}$ where $E_0$ is the amplitude and $k$ is the wave vector. Among the following options, the incorrect choice is
- (A)
  The direction of propagation of the electromagnetic wave is along $+z$
- (B)
  The speed of the electromagnetic wave inside the medium is $10^8\ \mathrm{ms^{-1}}$
- (C)
  The wavelength of the electromagnetic wave inside the medium is $300$ m
- (D)
  The magnetic field is given by the relation $B_y = \frac{B_0}{v}\sin(kz - 2\pi\times10^6 t)$ where $v$ is the speed of the electromagnetic wave inside the medium
2.
RE-NEET 2026
The following table presents the part of the electromagnetic spectrum and their corresponding major applications. Part of the electromagnetic spectrum: P. Microwave Q. UV rays R. Gamma rays S. Radio wave Applications: I. For purifying the water II. For warming the food III. For AM and FM communication systems IV. For treating the Cancer cells The correct option is:
- (A)
  P-II, Q-I, R-IV, S-III
- (B)
  P-I, Q-II, R-III, S-IV
- (C)
  P-II, Q-IV, R-III, S-I
- (D)
  P-I, Q-IV, R-II, S-III
3.
NEET 2026
Match List I with List II: List-I (Electromagnetic wave): A. Microwave, B. Visible light, C. Gamma rays, D. Infra-red rays List-II (Production): I. Electrons in atoms emit light when they move from a higher energy level to a lower energy level, II. Radioactive decay of nucleus, III. Vibration of atoms and molecules, IV. Klystron valve or magnetron valve Choose the correct answer from the options given below:
- (A)
  A-IV, B-III, C-II, D-I
- (B)
  A-IV, B-I, C-II, D-III
- (C)
  A-III, B-I, C-II, D-IV
- (D)
  A-III, B-IV, C-I, D-II
4.
NEET 2024
A parallel plate capacitor is charged by connecting it to a battery through a resistor. If $I$ is the current in the circuit, then in the gap between the plates:
- (A)
  there is no current.
- (B)
  displacement current of magnitude greater than $I$ flows but can be in any direction.
- (C)
  displacement current of magnitude equal to $I$ flows in a direction opposite to that of $I$ .
- (D)
  displacement current of magnitude equal to $I$ flows in the same direction as $I$ .
5.
NEET 2024
The property which is not of an electromagnetic wave travelling in free space is that:
- (A)
  their energy density in electric field is equal to energy density in magnetic field.
- (B)
  they travel with a speed equal to $\dfrac{1}{\sqrt{\mu_0\epsilon_0}}$ .
- (C)
  they are transverse in nature.
- (D)
  they originate from charges moving with uniform speed.
6.
NEET 2023
An ac source is connected to a capacitor $C$ . Due to decrease in its operating frequency :
- (A)
  capacitive reactance remains constant
- (B)
  capacitive reactance decreases.
- (C)
  displacement current increases.
- (D)
  displacement current decreases.
7.
NEET 2023
In a plane electromagnetic wave travelling in free space, the electric field component oscillates sinusoidally at a frequency of $2.0\times10^{10}\ \mathrm{Hz}$ and amplitude $48\ \mathrm{V\,m^{-1}}$ . Then the amplitude of oscillating magnetic field is : (Speed of light in free space $= 3\times10^{8}\ \mathrm{m\,s^{-1}}$ )
- (A)
  $1.6\times10^{-6}\ \mathrm{T}$
- (B)
  $1.6\times10^{-9}\ \mathrm{T}$
- (C)
  $1.6\times10^{-8}\ \mathrm{T}$
- (D)
  $1.6\times10^{-7}\ \mathrm{T}$
8.
NEET 2022
Match List - I with List - II: List - I (Electromagnetic Waves) (a) AM radio waves (b) Microwaves (c) Infrared radiations (d) X-rays List - II (Wavelength) (i) $10^{-10}$ m (ii) $10^{2}$ m (iii) $10^{-2}$ m (iv) $10^{-4}$ m Choose the correct answer from the options given below:
- (A)
  (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
- (B)
  (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
- (C)
  (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
- (D)
  (a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)
9.
NEET 2022
When light propagates through a material medium of relative permittivity $\epsilon_r$ and relative permeability $\mu_r$ , the velocity of light, $v$ , is given by: ( $c$ = velocity of light in vacuum)
- (A)
  $v=\dfrac{c}{\sqrt{\epsilon_r\mu_r}}$
- (B)
  $v=c$
- (C)
  $v=\sqrt{\dfrac{\mu_r}{\epsilon_r}}$
- (D)
  $v=\sqrt{\dfrac{\epsilon_r}{\mu_r}}$
10.
NEET 2021
A capacitor of capacitance $C$ , is connected across an ac source of voltage $V$ , given by $V = V_0 \sin\omega t$ . The displacement current between the plates of the capacitor, would then be given by :
- (A)
  $I_d = \dfrac{V_0}{\omega C}\sin\omega t$
- (B)
  $I_d = V_0\omega C\cos\omega t$
- (C)
  $I_d = \dfrac{V_0}{\omega C}\cos\omega t$
- (D)
  $I_d = V_0\omega C\sin\omega t$
11.
NEET 2021
For a plane electromagnetic wave propagating in $x$ -direction, which one of the following combination gives the correct possible directions for electric field ( $\vec{E}$ ) and magnetic field ( $\vec{B}$ ) respectively ?
- (A)
  $\hat{j}+\hat{k},\ \hat{j}+\hat{k}$
- (B)
  $-\hat{j}+\hat{k},\ -\hat{j}+\hat{k}$
- (C)
  $\hat{j}+\hat{k},\ -\hat{j}-\hat{k}$
- (D)
  $-\hat{j}+\hat{k},\ -\hat{j}-\hat{k}$
12.
NEET 2020
Light with an average flux of $20$ W/cm $^2$ falls on a non-reflecting surface at normal incidence having surface area $20$ cm $^2$ . The energy received by the surface during time span of $1$ minute is :
- (A)
  $10\times10^{3}$ J
- (B)
  $12\times10^{3}$ J
- (C)
  $24\times10^{3}$ J
- (D)
  $48\times10^{3}$ J
13.
NEET 2020
The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is : ( $c$ = speed of electromagnetic waves)
- (A)
  c : 1
- (B)
  1 : 1
- (C)
  1 : c
- (D)
  1 : $c^2$

Answer key

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