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Electromagnetic Waves MCQs | Electromagnetic Waves Multiple Choice Questions and Answers

Questions
1 The distance in EDM is measured by______________
A Phase difference
B Amplitude
C Frequency of the wave
D Wave length

Answer: Phase difference
2 Tellurometer, a type of EDM uses which of the following waves?
A Radio waves
B Micro waves
C Visible rays
D Infra-red waves

Answer: Radio waves
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3 Electromagnetic waves are represented in which of the following format?
A Sinusoidal waves
B Longitudinal waves
C Transverse waves
D None

Answer: Sinusoidal waves
4 What would be the value of length if the distance is given as 30m, m= 3 and the change in length is 8m.
A 7.34m
B 5.43m
C 7.43m
D None of these

Answer: 7.34m
5 What is the wavelength of light waves if their frequency is 5.0X1014 Hz?
A 0.60 micro-m
B 0.60 m
C 6.0 mm
D 0.060 mm

Answer: 0.60 micro-m
6 What frequency are 20 mm microwaves?
A 15 GHz
B 73 GHz
C 100 MHz
D None of these

Answer: 15 GHz
7 What is the wavelength of a signal with a frequency of 150Mhz?
A 2m
B 20m
C 10m
D None of these

Answer: 2m
8 What is the frequency of the EM wave with a wavelength of 12cm?
A 2.5Ghz
B 0.25Mhz
C 2.4Ghz
D None of these

Answer: 2.5Ghz
9 SHF Em waves are used in?
A Satellite communication
B Underwater communication
C Ground to ground communication
D Aircraft to ATC communication

Answer: Satellite communication
10 Which one of the following is not a reason for not using X-rays in communication?
A High power is required
B Stopped by ionizing effects
C Highly attenuated
D None of these

Answer: Stopped by ionizing effects
11 The portion of the electromagnetic spectrum occupied by a signal is called ________
A Bandwidth
B Signal spectrum
C Signal strength
D Frequency width

Answer: Bandwidth
12 Infrared radiation was discovered in 1860 by:
A William Herschel
B Thomas Young
C William Wallaston
D None of above

Answer: William Herschel
13 Which of the following rays is emitted by a human body?
A IR-rays
B UV-rays
C X-rays
D Visible rays

Answer: IR-rays
14 A free electron is placed in the path of a plane electromagnetic wave. The electron will start moving:
A along the direction of propagation of the wave
B in a plane containing the magnetic field and the direction of propagation
C along the electric field
D along the magnetic field

Answer: along the electric field
15 Electromagnetic waves ware transverse in nature is evident by:
A diffraction
B interference
C polarization
D reflection

Answer: polarization
16 The rms value of the electric field of the light coming from the sun is 720 N/C. The average total energy density of the electromagnetic wave is:
A 6.37×10–9 J/m3
B 3.3×10–3 J/m3
C 4.58×10–6 J/m3
D 81.35×10–12 J/m3

Answer: 6.37×10–9 J/m3
17 All electromagnetic waves travel through a vacuum at
A speeds that are inversely proportional to their frequency
B speeds that are proportional to their frequency
C the same speed
D None of the above

Answer: the same speed
18 The E and B fields in electromagnetic waves are oriented
A perpendicular to the wave's direction of travel, and also to each other
B perpendicular to the wave's direction of travel, and parallel to each other
C parallel to the wave's direction of travel, as well as to each other
D None

Answer: perpendicular to the wave's direction of travel, and also to each other
19 Which of the following correctly lists electromagnetic waves in order from longest to shortest wavelength?
A television, infrared, visible light, X-rays
B gamma rays, ultraviolet, infrared, microwaves
C microwaves, ultraviolet, visible light, gamma rays
D radio waves, infrared, gamma rays, ultraviolet

Answer: television, infrared, visible light, X-rays
20 Modern EDM uses which among the following waves?
A Visible rays
B Modulated infra-red
C Radio waves
D None of these

Answer: Modulated infra-red

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