Question 1: Palette 1/39

NEET 2026 MCQ

$ \text { Match List I with List II: } $

List-I (Electromagnetic wave)		List-II (Production)
A.	Microwave	I.	Electrons in atoms emit light when they move from a higher energy level to a lower energy level
B.	Visible light	II.	Radioactive decay of nucleus
C.	Gamma rays	III.	Vibration of atoms and molecules
D.	Infra-red rays	IV.	Klystron valve or magnetron valve

Choose the correct answer from the options given below:

A

A-III, B-I, C-II, D-IV

B

A-III, B-IV, C-I, D-II

C

A-IV, B-I, C-II, D-III

D

A-IV, B-III, C-II, D-I

Question 2: Palette 2/39

NEET 2026 MCQ

The following table presents the part of the electromagnetic spectrum and their corresponding major applications.

	Part of the electromagnetic spectrum		Applications
P.	Microwave	I.	For purifying the water
Q.	UV rays	II.	For warming the food
R.	Gamma rays	III.	For AM and FM communication systems
S.	Radio wave	IV.	For treating the Cancer cells

The correct option is:

A

P-II, Q-IV, R-III, S-I

B

P-I, Q-II, R-III, S-IV

C

P-I, Q-IV, R-II, S-III

D

P-II, Q-I, R-IV, S-III

Question 3: Palette 3/39

NEET 2026 MCQ

An electromagnetic wave travelling in a lossless dielectric medium having a dielectric constant, $\varepsilon_r=9$, has the electric field, $E_x=E_0 \sin \left(k z-2 \pi \times 10^6 t\right) \vee m^{-1}$ 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 $B_y=\frac{B_0}{v} \sin \left(k z-2 \pi \times 10^6 t\right)$ where $v$ is the speed of the electromagnetic wave inside the medium

Question 4: Palette 4/39

NEET 2025 MCQ

The electric field in a plane electromagnetic wave is given by $ E_z=60 \cos \left(5 x+1.5 \times 10^9 t\right) \mathrm{V} / \mathrm{m}$ Then expression for the corresponding magnetic field is (here subscripts denote the direction of the field) :

A

$B z=60 \cos \left(5 x+1.5 \times 10^9 t\right) T$

B

$B_y=60 \sin \left(5 x+1.5 \times 10^9 t\right) T$

C

$B_y=2 \times 10^{-7} \cos \left(5 x+1.5 \times 10^9 t\right) T$

D

$B_x=2 \times 10^{-7} \cos \left(5 x+1.5 \times 10^9 t\right) T$

Question 5: Palette 5/39

NEET 2024 MCQ

The electromagnetic radiation which has the smallest wavelength are

A

X-rays

B

Gamma rays

C

Ultraviolet rays

D

Microwaves

Question 6: Palette 6/39

NEET 2024 MCQ

If the ratio of relative permeability and relative permittivity of a uniform medium is $1: 4$. The ratio of the magnitudes of electric field intensity $(E)$ to the magnetic field intensity $(H)$ of an EM wave propagating in that medium is (Given that $\sqrt{\frac{\mu_0}{\varepsilon_0}}=120 \pi$):

A

$30 \pi: 1$

B

$1: 120 \pi$

C

$60 \pi: 1$

D

$120 \pi: 1$

Question 7: Palette 7/39

NEET 2024 MCQ

The property which is not of an electromagnetic wave travelling in free space is that:

A

They are transverse in nature

B

The energy density in electric field is equal to energy density in magnetic field

C

They travel with a speed equal to $\frac{1}{\sqrt{\mu_0 \varepsilon_0}}$

D

They originate from charges moving with uniform speed

Question 8: Palette 8/39

NEET 2023 MCQ

In a plane electromagnetic wave travelling in free space, the electric field component oscillates sinusoidally at a frequency of $2.0 \times 10^{10} \mathrm{~Hz}$ and amplitude $48 ~\mathrm{Vm}^{-1}$. Then the amplitude of oscillating magnetic field is : (Speed of light in free space $=3 \times 10^{8} \mathrm{~m} \mathrm{~s}^{-1}$ )

A

$1.6 \times 10^{-8} \mathrm{~T}$

B

$1.6 \times 10^{-7} \mathrm{~T}$

C

$1.6 \times 10^{-6} \mathrm{~T}$

D

$1.6 \times 10^{-9} \mathrm{~T}$

Question 9: Palette 9/39

NEET 2022 MCQ

The magnetic field of a plane electromagnetic wave is given by $\overrightarrow B = 3 \times {10^{ - 8}}\cos (1.6 \times {10^3}x + 48 \times {10^{10}}t)\widehat j$, then the associated electric field will be :

A

$9\cos (1.6 \times {10^3}x + 48 \times {10^{10}}t)\widehat k$ V/m

B

$3 \times {10^{ - 8}}\cos (1.6 \times {10^3}x + 48 \times {10^{10}}t)\widehat i$ V/m

C

$3 \times {10^{ - 8}}\sin (1.6 \times {10^3}x + 48 \times {10^{10}}t)\widehat i$ V/m

D

$9\sin (1.6 \times {10^3}x - 48 \times {10^{10}}t)\widehat k$ V/m

Question 10: Palette 10/39

NEET 2022 MCQ

The ratio of the magnitude of the magnetic field and electric field intensity of a plane electromagnetic wave in free space of permeability ${\mu _0}$ and permittivity ${\varepsilon _0}$ is (Given that c - velocity) of light in free space

A

${{\sqrt {{\mu _0}{\varepsilon _0}} } \over c}$

B

c

C

${1 \over c}$

D

${c \over {\sqrt {{\mu _0}{\varepsilon _0}} }}$

Question 11: Palette 11/39

NEET 2022 MCQ

Match List - I with List - II

	List - I (Electromagnetic waves)		List - II (Wavelength)
(a)	AM radio waves	(i)	${10^{ - 10}}$ m
(b)	Microwaves	(ii)	${10^2}$ m
(c)	Infrared radiations	(iii)	${10^{ - 2}}$ m
(d)	X-rays	(iv)	${10^{ - 4}}$ m

Choose the correct answer from the options given below

A

(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)

B

(a) - (iii), (b) - (ii), (c) - (i), (d) - (iv)

C

(a) - (iii), (b) - (iv), (c) - (ii), (d) - (i)

D

(a) - (ii), (b) - (iii), (c) - (iv), (d) - (i)

Question 12: Palette 12/39

NEET 2022 MCQ

When light propagates through a material medium of relative permittivity $\varepsilon $_r and relative permeability $\mu$_r, the velocity of light, v is given by (c-velocity of light in vacuum)

A

v = c

B

$v = \sqrt {{{{\mu _r}} \over {{\varepsilon _r}}}} $

C

$v = \sqrt {{{{\varepsilon _r}} \over {{\mu _r}}}} $

D

$v = {c \over {\sqrt {{\varepsilon _r}{\mu _r}} }}$

Question 13: Palette 13/39

NEET 2021 MCQ

For a plane electromagnetic wave propagating in x-direction, which one of the following combination gives the correct possible directions for electric field (E) and magnetic field (B) respectively?

A

$ - \widehat j + \widehat k, - \widehat j + \widehat k$

B

$ \widehat j + \widehat k, \widehat j + \widehat k$

C

$ - \widehat j + \widehat k, - \widehat j - \widehat k$

D

$\widehat j + \widehat k, - \widehat j - \widehat k$

Question 14: Palette 14/39

NEET 2020 MCQ

The ratio of contributions made by the electric field and magnetic field components to the intensity of and electromagnetic wave is : (c = speed of electromagnetic waves)

A

1 : 1

B

1 : c

C

1 : c²

D

c : 1

Question 15: Palette 15/39

NEET 2019 MCQ

Which colour of the light has the longest wavelength?

A

blue

B

violet

C

red

D

green

Question 16: Palette 16/39

NEET 2018 MCQ

An EM wave is propagating in a medium with a velocity $\overrightarrow v = v\widehat i$. The instantaneous oscillating electric field of this em wave is along +y axis. Then the direction of oscillating magnetic field of the em wave will be along

A

z direction

B

+z direction

C

–y direction

D

–x direction

Question 17: Palette 17/39

NEET 2017 MCQ

In an electromagnetic wave in free space that root mean square value of the electric field is E_rms = 6 V m^$-$1. The peak value of the magnetic field is

A

2.83 $ \times $ 10^$-$8 T

B

0.70 $ \times $ 10^$-$8 T

C

4.23 $ \times $ 10^$-$8 T

D

1.41 $ \times $ 10^$-$8 T

Question 18: Palette 18/39

NEET 2016 MCQ

Out of the following options which one can be used to produce a propagating electromagnetic wave ?

A

A chargeless particle

B

An accelerating charge

C

A charge moving at constant velocity

D

A stationary charge

Question 19: Palette 19/39

NEET 2015 MCQ

The energy of the em waves is of the order of 15 keV. To which part of the spectrum does it belong ?

A

Ultraviolet rays

B

$\gamma - rays$

C

X-rays

D

Infra-red rays

Question 20: Palette 20/39

NEET 2015 MCQ

A radiation of energy 'E' falls normally on a perfectly reflecting surface. The momentum transferred to the surface is (C = Velocity of light)

A

${{2E} \over {{C^2}}}$

B

${E \over {{C^2}}}$

C

${E \over C}$

D

${{2E} \over C}$

Question 21: Palette 21/39

NEET 2014 MCQ

Light with an energy flux of 25 $ \times $ 10⁴ W m^$-$2 falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm², the average force exerted on the surface is

A

1.25 $ \times $ 10^$-$6 N

B

2.50 $ \times $ 10^$-$6 N

C

1.20 $ \times $ 10^$-$6 N

D

3.0 $ \times $ 10^$-$6 N

Question 22: Palette 22/39

NEET 2013 MCQ

An electromagnetic wave of frequency $\upsilon = 3.0$ MHz passes from vaccum into a dielectric medium with relative permittivity ${{\varepsilon _r}}$ = 4.0. Then

A

Wavelength is doubled and frequency becomes half.

B

Wavelength is halved and frequency remains unchanged.

C

Wavelength and frequency both remain unchanged.

D

Wavelength is doubled and frequency unchanged.

Question 23: Palette 23/39

NEET 2013 MCQ

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is

A

Microwaves are heat waves, so always produce heating.

B

Infra-red waves produce heating in a microwave oven.

C

The frequency of the microwaves must match the resonant frequency of the water molecules.

D

The frequency of the microwaves has no relation with natural frequency of water molecules.

Question 24: Palette 24/39

NEET 2012 MCQ

The ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagatting in vacuum is equal to

A

the speed of light in vacuum

B

reciprocal of speed of light in vacuum

C

the ratio of magnetic permeability to the electric susceptibility of vacuum

D

unity

Question 25: Palette 25/39

NEET 2012 MCQ

The electric field associated with an em wave in vacuum is given by
E = $\widehat i$ 40 cos (kz $-$ 6 $ \times $ 10⁸ t) where E, z and t are in volt/m, meter and seconds respectively. The value of wave vector k is

A

2 m^$-$1

B

0.5 m^$-$1

C

6 m^$-$1

D

3 m^$-$1

Question 26: Palette 26/39

NEET 2011 MCQ

The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma rays is

A

microwave, infrared, ultraviolet, gamma rays

B

gamma rays, ultraviolet, infraref, microwaves

C

microwaves, gamma rays, infrared, ultraviolet

D

infrared, microwave, ultraviolet, gamma rays

Question 27: Palette 27/39

NEET 2011 MCQ

The electric and the magnetic field, associated with an e.m. wave, propagating along the +z-axis, can be represented by

A

$\left[ {\overrightarrow E = {E_0}\widehat i,\overrightarrow B = {B_0}\widehat j} \right]$

B

$\left[ {\overrightarrow E = {E_0}\widehat k,\overrightarrow B = {B_0}\widehat i} \right]$

C

$\left[ {\overrightarrow E = {E_0}\widehat j,\overrightarrow B = {B_0}\widehat i} \right]$

D

$\left[ {\overrightarrow E = {E_0}\widehat j,\overrightarrow B = {B_0}\widehat k} \right]$

Question 28: Palette 28/39

NEET 2010 MCQ

The electric field of an electromagnetic wave in free space is given by $\overrightarrow E = 10\cos ({10^7}t + kx)\widehat j\,\,V/m,$ where t and x are in seconds and metres respectively. It can be inferred that
(1)  the wavelength $\lambda $ is 188.4 m.
(2)  the wave number k is 0.33 rad/m.
(3)  the wave amplitude is 10 V/m.
(4)  the wave is propagating along +x direction.

Which one of the following pairs of statements is correct ?

A

(3)  and  (4)

B

(1)  and  (2)

C

(2)  and  (3)

D

(1)  and  (3)

Question 29: Palette 29/39

NEET 2010 MCQ

Which of the following statement is false for the properties of electromagnetic waves ?

A

Both electric and magnetic field vectors attain the maxima and minima at the same place and same time.

B

The energy in electromagnetic wave is divided equally between electric and magnetic vectors.

C

Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of wave.

D

These waves do not require any material medium for propagation.

Question 30: Palette 30/39

NEET 2009 MCQ

The electric field part of an electromagnetic wave in a medium is represented by E_x = 0;

${E_y} = 2.5{N \over C}\cos \left[ {\left( {2\pi \times {{10}^6}{{rad} \over m}} \right)t - \left( {\pi \times {{10}^{ - 2}}{{rad} \over s}} \right)x} \right];$

E_z = 0.

A

moving along x direction with frequency 10⁶ Hz and wavelength 100 m.

B

moving along x direction with frequency 10⁶ Hz and wavelength 200 m.

C

moving along $-$x direction with frequency 10⁶ Hz and wavelength 200 m.

D

moving along y direction with frequency $2\pi \times {10^6}\,Hz$ and wavelength 200 m.

Question 31: Palette 31/39

NEET 2008 MCQ

The velocity of electromagnetic radiation in a medium of permittivity $\varepsilon $₀ and permeability $\mu $₀ is given by

A

${1 \over {\sqrt {{\mu _0}{\varepsilon _0}} }}$

B

$\sqrt {{{{\mu _0}} \over {{\varepsilon _0}}}} $

C

$\sqrt {{{{\varepsilon _0}} \over {{\mu _0}}}} $

D

$\sqrt {{\mu _0}{\varepsilon _0}} $

Question 32: Palette 32/39

NEET 2007 MCQ

The electric and magnetic field of an electromagnetic wave are

A

in opposite phase and perpendicular to each other

B

in opposite phase and parallel to each other

C

in phase and perpendicular to each other

D

in phase and parallel to each other.

Question 33: Palette 33/39

NEET 2005 MCQ

If $\lambda $_v, $\lambda $_x and $\lambda $_m represent the wavelengths of visible light, X-rays and microwaves respectively, then

A

${\lambda _m} > {\lambda _x} > {\lambda _v}$

B

${\lambda _m} > {\lambda _v} > {\lambda _x}$

C

${\lambda _v} > {\lambda _x} > {\lambda _m}$

D

${\lambda _v} > {\lambda _m} > {\lambda _x}$

Question 34: Palette 34/39

NEET 2003 MCQ

We consider the radiation emitted by the human body. Which one of the following statements is true?

A

The radiation emitted is in the infra-red region

B

The radiation emitted only during the day

C

The radiation is emitted during the summers and absorbed during the winters

D

The radiation emitted lies in the ultraviolet region and hence is not visible

Question 35: Palette 35/39

NEET 2003 MCQ

Which of the following rays are not electromagnetic waves ?

A

X-rays

B

$\gamma $-rays

C

$\beta $-rays

D

heat rays

Question 36: Palette 36/39

NEET 2002 MCQ

The velocity of electromagnetic wave is parallel to

A

$\overrightarrow B \times \overrightarrow E $

B

$\overrightarrow E \times \overrightarrow B $

C

$\overrightarrow E $

D

$\overrightarrow B $

Question 37: Palette 37/39

NEET 2002 MCQ

What is the cause of Green house effect ?

A

infra-red rays

B

ultra violet rays

C

X-rays

D

radio waves.

Question 38: Palette 38/39

NEET 2001 MCQ

Biological inportance of ozone layer is

A

it stops ultraviolet rays

B

ozone layer reduces green house effect

C

ozone layer reflects radio waves

D

ozone layer controls O₂/H₂ ratio in atmosphertte.

Question 39: Palette 39/39

NEET 2000 MCQ

The frequency order for $\gamma $-rays (a), X-rays (b), UV rays (c) is

A

b $>$ a $>$ c

B

a $>$ b $>$ c

C

c $>$ b $>$ a

D

a $>$ c $>$ b