Electromagnetic Waves Quiz | Electromagnetic Waves Objective Type Questions and Answers

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Questions
21 Which property of an electromagnetic wave, depends on the medium in which it is travelling?
A Wave length
B Time period
C Frequency
D Velocity

Answer: Velocity
22 Find the value of D if the wave length of the wave is 40m, n=2 m and the angles are given as θ1 = 0˚, θ2 = 180˚.
A 20m
B 40m
C 10m
D 50m

Answer: 50m
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23 Phase difference can be expressed in which of the following format?
A Cycles
B Seconds
C Meters per second
D None

Answer: Cycles
24 Which of the following represents the correct sequence for the basis of EDM propagation?
A Generation, propagation, reflection and reception
B Generation, propagation, reception and reflection
C Propagation, generation, reflection and reception
D None of these

Answer: Generation, propagation, reflection and reception
25 Cps is the unit of what?
A Frequency
B Gain
C Amplitude
D Phase

Answer: Frequency
26 The distance that the wave travels in one cycle is called as?
A Wavelength
B Cycle amplitude
C Cycle length
D None of these

Answer: Wavelength
27 The range of electromagnetic signals encompassing all frequencies is referred to as?
A EM spectrum
B EM radiation
C EM waves
D EM frequency

Answer: EM spectrum
28 A signal travels a distance of 75 ft in the time it takes to complete 1 cycle. What is its frequency? 1 m 5 3.28 ft
A 13.12Mhz
B 14Mhz
C 13Mhz
D None of these

Answer: 13.12Mhz
29 The maximum peaks of an electromagnetic wave are separated by a distance of 8 in. What is the frequency?
A 1477.8Mhz
B 256.4Khz
C 1477.8Khz
D 256.7Mhz

Answer: 1477.8Mhz
30 Which one of the following is not a source of infrared radiation?
A Books
B Sun
C Human bodies
D None of these

Answer: Books
31 What is the bandwidth of a signal having 928Mhz and 902Mhz as its upper and lower frequencies?
A 1830Mhz
B 1830Hz
C 26Hz
D 26Mhz

Answer: 26Mhz
32 What is the upper frequency of a signal with a bandwidth of 6Mhz, if the lower frequency limit is 54Mhz?
A 60Hz
B 48Hz
C 60Mhz
D None of above

Answer: 60Mhz
33 Speed of electromagnetic waves is same
A for all intensities
B for all frequencies
C for all wavelengths
D in all media

Answer: for all intensities
34 Electromagnetic waves do not transport:
A Charge
B Energy
C Momentum
D Information

Answer: Charge
35 Electromagnetic waves are produced by:
A charge in uniform motion
B accelerated charged particle
C deaccelerated charged particle
D none of the above

Answer: accelerated charged particle
36 An electromagnetic radiation has an energy of 13.2 keV. Then, the radiation belongs to the region of
A ultraviolet
B X-ray
C visible light
D infrared

Answer: ultraviolet
37 All electromagnetic waves travel through a vacuum at
A the same speed
B speeds that are proportional to their frequency
C the same speed
D None of the above

Answer: the same speed
38 Electromagnetic waves are
A Transverse
B Both Longitudinal And Transverse
C Longitudinal
D None Of The Above

Answer: Transverse
39 An electromagnetic wave is radiated by a straight wire antenna that is oriented vertically. What should be the orientation of a straight wire receiving antenna? It should be placed
A vertically
B horizontally and in a direction perpendicular to the wave's direction of motion
C horizontally and in a direction parallel to the wave's direction of motion
D None of the above

Answer: vertically
40 Which organization regulates international EM spectrum division?
A NTIA
B FCC
C ITU
D None of these

Answer: ITU
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