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Electromagnetic Theory MCQ Questions & Answers

Electromagnetic Theory MCQs : This section focuses on the "Electromagnetic Theory". These Multiple Choice Questions (MCQs) should be practiced to improve the Electromagnetic Theory skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

The conductivity in free space medium is

A. Infinity
B. Unity
C. Zero
D. Negative

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Question 2

Identify which is not a type of waveguide.

A. Rectangular
B. Circular
C. Cylindrical
D. Cavity resonator

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Question 3

Which parameter is unity in air medium?

A. Permittivity
B. Absolute permittivity
C. Relative permittivity
D. Permeability

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Question 4

In free space, which parameter will be unity?

A. Permittivity
B. Absolute permittivity
C. Relative permittivity
D. Permeability

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Question 5

Constructive interference occur when total phase change after two successive reflections at upper and lower interfaces is equal to? (Where m is integer)

A. 2Πm
B. Πm
C. Πm/4
D. Πm/6

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Question 6

In free space, the condition that holds good is

A. Minimum attenuation and propagation
B. Minimum attenuation and maximum propagation
C. Maximum attenuation and minimum propagation
D. Maximum attenuation and propagation

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Question 7

Choose the optical fibre material from the given materials.

A. Glass
B. Plastic
C. Silica
D. Quartz

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Question 8

The vectors of the electromagnetic wave propagation can be expressed in

A. Dot product
B. Cross product
C. Unit vector
D. Perpendicular vector

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Question 9

The cut off frequency for waveguide operation is

A. 2 MHz
B. 6 GHz
C. 4 MHz
D. 6 MHz

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Question 10

Which equations are best suited for the study of electromagnetic wave propagation?

A. Maxwell’s equations
B. Allen-Cahn equations
C. Avrami equations
D. Boltzmann’s equations

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Question 11

Telephone lines and power lines are open wire transmission lines. State true/false.

A. True
B. False

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Question 12

The phenomenon which occurs when an incident wave strikes an interface at an angle greater than the critical angle with respect to the normal to the surface is called as ____________

A. Refraction
B. Partial internal reflection
C. Total internal reflection
D. Limiting case of refraction

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Question 13

Find the refractive index of a medium having a velocity of 1.5 x 10^8.

A. 0.5
B. 5
C. 0.2
D. 2

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Question 14

The refractive index of water will be

A. 1
B. 2.66
C. 5
D. 1.33

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Question 15

What is refraction?

A. Bending of light waves
B. Reflection of light waves
C. Diffusion of light waves
D. Refraction of light waves

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Question 16

The cable transmission line consists of

A. Conductors
B. Insulators
C. Insulated conductors
D. Insulated conductors with dielectric

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Question 17

The highest means of communication is

A. Internet
B. Telephone
C. Television
D. Radio

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Question 18

For total internal reflection to occur, which condition must be satisfied?

A. N1 = N2
B. N1 > N2
C. N1 < N2
D. N1 x N2=1

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Question 19

In free space, the charge carriers will be

A. 0
B. 1
C. 100
D. Infinity

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Question 20

The range of frequencies handled by the waveguides is in

A. Hz
B. KHz
C. MHz
D. GHz

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Question 21

The range of frequencies operated by the coaxial cables is in

A. Hz
B. KHz
C. MHz
D. GHz

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Question 22

The coaxial cable are used in

A. Telephone cables transmission
B. Power transmission
C. Television signal transmission
D. Short wave transmission

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Question 23

Which is the most important velocity in the study of transmission characteristics of optical fiber?

A. Phase velocity
B. Group velocity
C. Normalized velocity
D. Average velocity

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Question 24

Numerical aperture is expressed as the

A. NA = sin θa
B. NA = cos θa
C. NA = tan θa
D. NA = sec θa

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Question 25

The refractive index is 2.33 and the critical angle is 350. Find the numerical aperture.

A. 2
B. 1.9
C. 2.33
D. 12

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Question 26

A monochromatic wave propagates along a waveguide in z direction. These points of constant phase travel in constant phase travel at a phase velocity Vp is given by?

A. Vp=ω/β
B. Vp=ω/c
C. Vp=C/N
D. Vp=mass/acceleration

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Question 27

The Snells law can be derived from which type of incidence?

A. Incidence angle
B. Reflected angle
C. Refracted angle
D. Oblique incidence

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Question 28

The open wire transmission line consists of

A. Conductor
B. Dielectric
C. Both conductor and dielectric
D. Either conductor or dielectric

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Question 29

The refractive index of air is unity. State True/False.

A. True
B. False

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Question 30

Identify which of the following is not a transmission line?

A. Telephone lines
B. Power transmission
C. Underground cables
D. Cavity resonators

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Question 31

The numerical aperture of a material with acceptance angle of 60 degree in water will be

A. 1.15
B. 2.15
C. 5.21
D. 1.52

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Question 32

The intrinsic impedance of free space is

A. 489
B. 265
C. 192
D. 377

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Question 33

When λ is the optical wavelength in vacuum, k is given by k=2Π/λ. What does k stand for in the above equation?

A. Phase propagation constant
B. Dielectric constant
C. Boltzmann’s constant
D. Free-space constant

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Question 34

The coaxial cable consists of

A. Conductors
B. Insulators
C. Conductor with dielectric
D. Two conductors with dielectric

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Question 35

The expression for refractive index is given by

A. N = v/c
B. N = c/v
C. N = cv
D. N = 1/cv

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Question 36

Zero permeability/permittivity implies which state?

A. No ions are allowed in the medium
B. No current is generated in the medium
C. No magnetic or electric energy is permitted in the medium
D. No resistivity

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