Quiz - physics - Electromagnetic Wave-PYQ

Q1. A parallel plate capacitor of capacitance 20 mF is being charged by a voltage source whose potential is changing at the rate of 3 V/s. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively (NEET 2019) Source: orcusprep.in

NEET 2019

medium

zero, zero

zero, 60 mA

60 mA, 60 mA

60 mA, zero

Q2. A 100 \( \Omega \) resistance and a capacitor of 100 \( \Omega \) reactance are connected in series across a 220 V source. When the capacitor is 50% charged, the peak value of the displacement current is (NEET-II 2016) Source: orcusprep.in

NEET-II 2016

hard

2.2 A

11 A

4.4 A

11\( \sqrt{2} \) A

Q3. 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 (NEET 2020) Source: orcusprep.in

NEET 2020

easy

10 \( \times \) 10\(^{3}\) J

12 \( \times \) 10\(^{3}\) J

24 \( \times \) 10\(^{3}\) J

48 \( \times \) 10\(^{3}\) J

Q4. 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) (NEET 2020) Source: orcusprep.in

NEET 2020

easy

c : 1

1 : 1

1 : c

1 : c\(^{2}\)

Q5. For a transparent medium relative permeability and permittivity, \( \mu_r \) and \( \epsilon_r \) are 1.0 and 1.44 respectively. The velocity of light in this medium would be (Odisha NEET 2019) Source: orcusprep.in

Odisha NEET 2019

medium

2.5 \( \times \) 10\(^{8}\) m/s

3 \( \times \) 10\(^{8}\) m/s

2.08 \( \times \) 10\(^{8}\) m/s

4.32 \( \times \) 10\(^{8}\) m/s

Q6. An em wave is propagating in a medium with a velocity \( \vec{v} = v \hat{i} \). 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 (NEET 2018) Source: orcusprep.in

NEET 2018

easy

–z direction

+z direction

–y direction

–x direction

Q7. In an electromagnetic wave in free space the root mean square value of the electric field is \( E_{rms} = 6 \,\text{V m}^{-1} \). The peak value of the magnetic field is (NEET 2017) Source: orcusprep.in

NEET 2017

medium

2.83 \( \times \) 10\(^{-8}\) T

0.70 \( \times \) 10\(^{-8}\) T

4.23 \( \times \) 10\(^{-8}\) T

1.41 \( \times \) 10\(^{-8}\) T

Q8. Out of the following options which one can be used to produce a propagating electromagnetic wave ? (NEET-I 2016) Source: orcusprep.in

NEET-I 2016

easy

A chargeless particle

An accelerating charge

A charge moving at constant velocity

A stationary charge

Q9. Light with an energy flux of \( 25 \times 10^4 \,\text{W m}^{-2} \) falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 cm\(^{2}\), the average force exerted on the surface is (NEET 2014) Source: orcusprep.in

NEET 2014

medium

1.25 \( \times \) 10\(^{-6}\) N

2.50 \( \times \) 10\(^{-6}\) N

1.20 \( \times \) 10\(^{-6}\) N

3.0 \( \times \) 10\(^{-6}\) N

Q10. An electromagnetic wave of frequency \( \nu = 3.0 \,\text{MHz} \) passes from vacuum into a dielectric medium with relative permittivity \( \epsilon_r = 4.0 \). Then (Karnataka NEET 2013) Source: orcusprep.in

Karnataka NEET 2013

medium

Wavelength is doubled and frequency becomes half.

Wavelength is halved and frequency remains unchanged.

Wavelength and frequency both remain unchanged.

Wavelength is doubled and frequency unchanged

Q11. The electric field associated with an em wave in vacuum is given by \( \vec{E} = 40\cos(kz - 6 \times 10^8 t) \hat{i} \); where E, z and t are in V/m, meter and seconds respectively. The value of wave vector k is (NEET 2012) Source: orcusprep.in

NEET 2012

medium

2 m\(^{-1}\)

0.5 m\(^{-1}\)

6 m\(^{-1}\)

3 m\(^{-1}\)

Q12. The ratio of amplitude of magnetic field to the amplitude of electric field for an electromagnetic wave propagating in vacuum is equal to (NEET Mains 2012) Source: orcusprep.in

NEET Mains 2012

easy

the speed of light in vacuum

reciprocal of speed of light in vacuum

the ratio of magnetic permeability to the electric susceptibility of vacuum

unity

Q13. The electric and the magnetic field, associated with an e.m. wave, propagating along the +z-axis, can be represented by (NEET 2011) Source: orcusprep.in

NEET 2011

medium

\( \vec{E} = E_0 \hat{i}, \vec{B} = B_0 \hat{j} \)

\( \vec{E} = E_0 \hat{k}, \vec{B} = B_0 \hat{i} \)

\( \vec{E} = E_0 \hat{j}, \vec{B} = B_0 \hat{i} \)

\( \vec{E} = E_0 \hat{j}, \vec{B} = B_0 \hat{k} \)

Q14. Which of the following statement is false for the properties of electromagnetic waves ? (NEET 2010) Source: orcusprep.in

NEET 2010

easy

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

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

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

These waves do not require any material medium for propagation

Q15. The electric field of an electromagnetic wave in free space is given by \( \vec{E} = 10\cos(kx + 10^7 t) \hat{j} \) V/m, where t and x are in seconds and metres respectively. It can be inferred that (NEET Mains 2010) Source: orcusprep.in

NEET Mains 2010

medium

(3) and (4)

(1) and (2)

(2) and (3)

(1) and (3)

Q16. The electric field part of an electromagnetic wave in a medium is represented by \( E_x = 0 \); \( E_y = 2.5 \cos[(2\pi \times 10^6)x - (2\pi \times 10^6)t] \) N/C; \( E_z = 0 \). The wave is (NEET 2009) Source: orcusprep.in

NEET 2009

medium

moving along x direction with frequency \( 10^6 \) Hz and wavelength \( 100 \) m

moving along x direction with frequency \( 10^6 \) Hz and wavelength \( 200 \) m

moving along -x direction with frequency \( 10^6 \) Hz and wavelength \( 200 \) m

moving along y direction with frequency \( 2\pi \times 10^6 \) Hz and wavelength \( 200 \) m.

Q17. The velocity of electromagnetic radiation in a medium of permittivity \( \epsilon_0 \) and permeability \( \mu_0 \) is given by (NEET 2008) Source: orcusprep.in

NEET 2008

easy

\( \frac{1}{\sqrt{\mu_0\epsilon_0}} \)

\( \sqrt{\frac{\mu_0}{\epsilon_0}} \)

\( \sqrt{\frac{\epsilon_0}{\mu_0}} \)

\( \mu_0\epsilon_0 \)

Q18. The electric and magnetic field of an electromagnetic wave are (NEET 2007, 1994) Source: orcusprep.in

NEET 2007, 1994

easy

in opposite phase and perpendicular to each other

in opposite phase and parallel to each other

in phase and perpendicular to each other

in phase and parallel to each other.

Q19. The velocity of electromagnetic wave is parallel to (NEET 2002) Source: orcusprep.in

NEET 2002

easy

\( \vec{B} \times \vec{E} \)

\( \vec{E} \times \vec{B} \)

\( \vec{E} \)

\( \vec{B} \)

Q20. Wavelength of light of frequency 100 Hz is (NEET 1999) Source: orcusprep.in

NEET 1999

easy

4 \( \times \) 10\(^{6}\) m

3 \( \times \) 10\(^{6}\) m

2 \( \times \) 10\(^{6}\) m

5 \( \times \) 10\(^{-5}\) m

Q21. If \( \epsilon_0 \) and \( \mu_0 \) are the electric permittivity and magnetic permeability in a free space, \( \epsilon \) and \( \mu \) are the corresponding quantities in medium, the index of refraction of the medium is (NEET 1997) Source: orcusprep.in

NEET 1997

medium

\( \frac{\epsilon\mu}{\epsilon_0\mu_0} \)

\( \sqrt{\frac{\epsilon\mu}{\epsilon_0\mu_0}} \)

\( \sqrt{\frac{\epsilon}{\epsilon_0}} \)

\( \frac{\epsilon}{\epsilon_0} \)

Q22. The frequency of electromagnetic wave, which best suited to observe a particle of radius \( 3 \times 10^{-4} \) cm is of the order of (NEET 1991) Source: orcusprep.in

NEET 1991

hard

10\(^{15}\)

10\(^{14}\)

10\(^{13}\)

10\(^{12}\)

Q23. The energy of the em waves is of the order of 15 keV. To which part of the spectrum does it belong? (NEET 2015) Source: orcusprep.in

NEET 2015

easy

Ultraviolet rays

g-rays

X-rays

Infra-red rays

Q24. The condition under which a microwave oven heats up a food item containing water molecules most efficiently is (NEET 2013) Source: orcusprep.in

NEET 2013

medium

microwaves are heat waves, so always produce heating

infra-red waves produce heating in a microwave oven

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

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

Q25. The decreasing order of wavelength of infrared, microwave, ultraviolet and gamma rays is (NEET 2011) Source: orcusprep.in

NEET 2011

easy

microwave, infrared, ultraviolet, gamma rays

gamma rays, ultraviolet, infrared, microwaves

microwaves, gamma rays, infrared, ultraviolet

infrared, microwave, ultraviolet, gamma rays

Q26. If \( \lambda_v \), \( \lambda_x \) and \( \lambda_m \) represent the wavelengths of visible light, X-rays and microwaves respectively, then (NEET 2005) Source: orcusprep.in

NEET 2005

easy

\( \lambda_m > \lambda_x > \lambda_v \)

\( \lambda_m > \lambda_v > \lambda_x \)

\( \lambda_v > \lambda_x > \lambda_m \)

\( \lambda_v > \lambda_m > \lambda_x \).

Q27. We consider the radiation emitted by the human body. Which one of the following statements is true? (NEET 2003) Source: orcusprep.in

NEET 2003

easy

The radiation emitted is in the infrared region.

The radiation is emitted only during the day.

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

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

Q28. Which of the following rays are not electromagnetic waves ? (NEET 2003) Source: orcusprep.in

NEET 2003

easy

X-rays

g-rays

b-rays

heat rays

Q29. What is the cause of Green house effect? (NEET 2002) Source: orcusprep.in

NEET 2002

easy

Infra-red rays

Ultra violet rays

X-rays

Radio waves

Q30. Biological importance of ozone layer is (NEET 2001) Source: orcusprep.in

NEET 2001

easy

it stops ultraviolet rays

ozone layer reduces green house effect

ozone layer reflects radio waves

ozone layer controls O2/H2 ratio in atmosphere.

Q31. The frequency order for g-rays (B), X-rays (A), UV rays (C) is (NEET 2000) Source: orcusprep.in

NEET 2000

easy

B > A > C

A > B > C

C > B > A

A > C > B.

Q32. Ozone layer blocks the radiations of wavelength (NEET 1999) Source: orcusprep.in

NEET 1999

medium

more than 3 \( \times \) 10\(^{-7}\) m

equal to 3 \( \times \) 10\(^{-7}\) m

less than 3 \( \times \) 10\(^{-7}\) m

all of these

Q33. Which of the following electromagnetic radiations have the smaller wavelength? (NEET 1994) Source: orcusprep.in

NEET 1994

easy

X-rays

g-rays

UV waves

microwaves

Q34. A signal emitted by an antenna from a certain point can be received at another point of the surface in the form of (NEET 1993) Source: orcusprep.in

NEET 1993

medium

sky wave

ground wave

sea wave

both (a) and (b)

Q35. The structure of solids is investigated by using (NEET 1992) Source: orcusprep.in

NEET 1992

medium

cosmic rays

X-rays

g-rays

infra-red radiations

Q36. Which of the following electromagnetic radiations have the longest wavelength ? (NEET 1989) Source: orcusprep.in

NEET 1989

easy

X-rays

g-rays

Microwaves

Radiowaves

Q37. Light with an average flux of 20 W/cm2 falls on a non-reflecting surface at normal incidence having surface area 20 cm2. The energy received by the surface during time span of 1 minute is : (NEET 2020) Source: orcusprep.in

NEET 2020

easy

48 \( \times \) 10\(^{3}\) J

10 \( \times \) 10\(^{3}\) J

12 \( \times \) 10\(^{3}\) J

24 \( \times \) 10\(^{3}\) J

Q38. 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) (NEET 2020) Source: orcusprep.in

NEET 2020

easy

1 : c\(^{2}\)

c : 1

1 : 1

1 : c

Q39. The E.M. wave with shortest wavelength among the following is (NEET (UG) 2020 (COVID-19)) Source: orcusprep.in

NEET (UG) 2020 (COVID-19)

easy

Ultraviolet rays

X-rays

Gamma-rays

Microwaves

Q40. The magnetic field in a plane electromagnetic wave is given by : \( B_y = 2 \times 10^{-7} \sin (\pi \times 10^3 x + 3\pi \times 10^{11} t) \)T. Calculate the wavelength. Source: orcusprep.in

NEET (UG) 2020 (COVID-19)

medium

\( \pi \times 10^3 \,\text{m} \)

\( 2 \times 10^{-3} \,\text{m} \)

\( 2 \times 10^3 \,\text{m} \)

\( \pi \times 10^{-3} \,\text{m} \)

Q41. A capacitor of capacitance 'C', is connected across an ac source of voltage V, given by V = V0 sin\( \omega \)t. The displacement current between the plates of the capacitor, would then be given by : (NEET 2021) Source: orcusprep.in

NEET 2021

medium

\( I_d = V_0 \omega C\cos\omega t \)

\( I_d = \frac{V_0}{C}\omega \cos\omega t \)

\( I_d = \frac{V_0}{C}\omega \sin\omega t \)

\( I_d = V_0 \omega C\sin\omega t \)

Q42. 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? (NEET 2021) Source: orcusprep.in

NEET 2021

hard

(\( \hat{j}, \hat{k} \))

(\( -\hat{j}, -\hat{k} \))

(\( \hat{j}, -\hat{k} \))

(\( -\hat{j}, \hat{k} \))

Q43. When light propagates through a material medium of relative permittivity \( \epsilon_r \) and relative permeability \( \mu_r \), the velocity of light, \( \nu \) is given by: (c-velocity of light in vacuum) (NEET 2022) Source: orcusprep.in

NEET 2022

easy

\( \nu = \sqrt{\frac{\mu_r}{\epsilon_r}} \)

\( \nu = \sqrt{\frac{\epsilon_r}{\mu_r}} \)

\( \nu = \frac{c}{\sqrt{\epsilon_r \mu_r}} \)

\( \nu = c \)

Q44. 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 : (NEET 2022) Source: orcusprep.in

NEET 2022

medium

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

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

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

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

Q45. An electromagnetic wave is moving along negative z(\(-z\)) direction and at any instant of time, at a point, its electric field vector is \( 3\hat{j} \) V/m. The corresponding magnetic field at that point and instant will be: (Take c = \( 3 \times 10^8 \)ms\(^{-1}\)) (NEET (UG) 2022 (Overseas)) Source: orcusprep.in

NEET (UG) 2022 (Overseas)

medium

\( -10\hat{i} \) nT

\( \hat{i} \) nT

\( -\hat{i} \) nT

\( 10\hat{i} \) nT

Q46. If \( \lambda_X, \lambda_I, \lambda_M \) and \( \lambda_\gamma \) are the wavelengths of X-rays, infrared rays, microwaves and \( \gamma \) rays respectively, then: (NEET (UG) 2022 (Overseas)) Source: orcusprep.in

NEET (UG) 2022 (Overseas)

easy

\( \lambda_M < \lambda_I < \lambda_X < \lambda_\gamma \)

\( \lambda_X < \lambda_\gamma < \lambda_M < \lambda_I \)

\( \lambda_X < \lambda_I < \lambda_\gamma < \lambda_M \)

\( \lambda_\gamma < \lambda_X < \lambda_I < \lambda_M \)

Q47. The magnetic field of a plane electromagnetic wave is given by \( \vec{B} = 3 \times 10^{-8} \cos(1.6 \times 10^3 x + 4.8 \times 10^{11} t)\hat{j} \) then the associated electric field will be : (Re-NEET (UG) 2022) Source: orcusprep.in

Re-NEET (UG) 2022

hard

\( -3 \times 10^8 \cos(1.6 \times 10^3 x + 4.8 \times 10^{11} t)\hat{i} \) V/m

\( -3 \times 10^8 \sin(1.6 \times 10^3 x + 4.8 \times 10^{11} t)\hat{i} \) V/m

\( 9 \times 10^{-9} \cos(1.6 \times 10^3 x + 4.8 \times 10^{11} t)\hat{k} \) V/m

\( 9 \cos(1.6 \times 10^3 x + 4.8 \times 10^{11} t)\hat{k} \) V/m

Q48. 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 \( \epsilon_0 \) is (Given that c – velocity of light in free space) (Re-NEET (UG) 2022) Source: orcusprep.in

Re-NEET (UG) 2022

easy

c

\( \frac{1}{c} \)

\( c\mu_0\epsilon_0 \)

\( \frac{1}{c\mu_0\epsilon_0} \)

Q49. The electric field in a plane electromagnetic wave is given by \( E_z = 60 \cos (5x + 1.5 \times 10^9 t) \text{V/m} \). Then expression for the corresponding magnetic field is (here subscripts denote the direction of the field) : Source: orcusprep.in

NEET 2025

medium

\( B_z = 60 \cos (5x + 1.5 \times 10^9 t) \text{T} \)

\( B_y = 60 \sin (5x + 1.5 \times 10^9 t) \text{T} \)

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

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

Q50. The electromagnetic radiation which has the smallest wavelength are Source: orcusprep.in

NEET 2024 Re

easy

X-rays

Gamma rays

Ultraviolet rays

Microwaves

Q51. 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 \( \sqrt{\frac{\mu_0}{\epsilon_0}} = 120\pi \)) Source: orcusprep.in

NEET 2024 Re

medium

30π : 1

1 : 120π

60π : 1

120π : 1

Q52. The property which is not of an electromagnetic wave travelling in free space is that: Source: orcusprep.in

NEET 2024

easy

They are transverse in nature

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

They travel with a speed equal to \( \frac{1}{\sqrt{\mu_0\epsilon_0}} \)

They originate from charges moving with uniform speed

Q53. In a plane electromagnetic wave travelling in free space, the electric field component oscillates sinusoidally at a frequency of 2.0 \( \times \) 10¹⁰ Hz and amplitude 48 Vm⁻¹. Then the amplitude of oscillating magnetic field is (Speed of light in free space = 3 \( \times \) 10⁸ m s⁻¹) Source: orcusprep.in

NEET 2023

easy

1.6 \( \times \) 10⁻⁸ T

1.6 \( \times \) 10⁻⁷ T

1.6 \( \times \) 10⁻⁶ T

1.6 \( \times \) 10⁻⁹ T

Q54. An ac source is connected to a capacitor C. Due to decrease in its operating frequency Source: orcusprep.in

NEET 2023

easy

Displacement current increases

Displacement current decreases

Capacitive reactance remains constant

Capacitive reactance decreases

Q55. The minimum wavelength of X-rays produced by an electron accelerated through a potential difference of V volts is proportional to Source: orcusprep.in

NEET 2023

easy

1/V

1/√V

V²

√V

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Physics - Electromagnetic Wave-PYQ

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Physics - Electromagnetic Wave-PYQ

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