DAPZOI
Home Ask MCQ Quiz Topics Login


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

View Answer

Question 2

Identify which is not a type of waveguide.

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

View Answer

Question 3

Which parameter is unity in air medium?

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

View Answer

Question 4

In free space, which parameter will be unity?

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

View Answer

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

View Answer

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

View Answer

Question 7

Choose the optical fibre material from the given materials.

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

View Answer

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

View Answer

Question 9

The cut off frequency for waveguide operation is

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

View Answer

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

View Answer

Question 11

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

A. True
B. False

View Answer

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

View Answer

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

View Answer

Question 14

The refractive index of water will be

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

View Answer

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

View Answer

Question 16

The cable transmission line consists of

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

View Answer

Question 17

The highest means of communication is

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

View Answer

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

View Answer

Question 19

In free space, the charge carriers will be

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

View Answer

Question 20

The range of frequencies handled by the waveguides is in

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

View Answer

Question 21

The range of frequencies operated by the coaxial cables is in

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

View Answer

Question 22

The coaxial cable are used in

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

View Answer

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

View Answer

Question 24

Numerical aperture is expressed as the

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

View Answer

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

View Answer

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

View Answer

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

View Answer

Question 28

The open wire transmission line consists of

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

View Answer

Question 29

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

A. True
B. False

View Answer

Question 30

Identify which of the following is not a transmission line?

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

View Answer

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

View Answer

Question 32

The intrinsic impedance of free space is

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

View Answer

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

View Answer

Question 34

The coaxial cable consists of

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

View Answer

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

View Answer

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

View Answer