Electromagnetic Waves MCQs | Electromagnetic Waves Multiple Choice Questions and Answers

Sports GK Questions and Answers 2024 (Latest Updated)

Awards & Honours GK Questions 2024 (Latest Updated)

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
Advertisement
Article and Schedule Quiz Start Test!
DOWNLOAD CURRENT AFFAIRS PDF FROM APP
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

Random GK Questions

Q. Dual citizenship is a feature of
Q. What is the tenure of the Prime Minister of India?
Q. The work of river in middle course is mainly
Q. Which of the following is the heaviest metal in periodic table?
Q. The structure present over chromosome is
Q. Prohibition of discrimination on grounds of religion, race, caste, sex or place of birth is a fundamental right classifiable under
Assam Direct Recruitment Test Series

Computer Science Topics