Electromagnetic Spectrum MCQs : This section focuses on the "Electromagnetic Spectrum". These Multiple Choice Questions (MCQs) should be practiced to improve the Electromagnetic Spectrum skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
Of the following, _________ has the maximum frequency.
A. UV Rays
B. Gamma Rays
C. Microwaves
D. Radio Waves
Question 2
Cps is the unit of what?
A. Frequency
B. Amplitude
C. Phase
D. Gain
Question 3
Higher frequencies can have more channels for a particular bandwidth.
A. True
B. False
Question 4
SHF Em waves are used in?
A. Ground to ground communication
B. Satellite communication
C. Aircraft to ATC communication
D. Underwater communication
Question 5
The distance that the wave travels in one cycle is called as?
A. Displacement
B. Wavelength
C. Cycle length
D. Cycle amplitude
Question 6
The maximum peaks of an electromagnetic wave are separated by a distance of 8 in. What is the frequency?
A. 256.4Khz
B. 1477.8Khz
C. 1477.8Mhz
D. 256.7Mhz
Question 7
The portion of the electromagnetic spectrum occupied by a signal is called ________
A. Signal spectrum
B. Bandwidth
C. Frequency width
D. Signal strength
Question 8
The range of electromagnetic signals encompassing all frequencies is referred to as?
A. EM waves
B. EM frequency
C. EM spectrum
D. EM radiation
Question 9
What is the bandwidth of a signal having 928Mhz and 902Mhz as its upper and lower frequencies?
A. 26Mhz
B. 26Hz
C. 1830Hz
D. 1830Mhz
Question 10
What is the frequency of the EM wave with a wavelength of 12cm?
A. 2.4Ghz
B. 2.5Ghz
C. 250 Mhz
D. 0.25Mhz
Question 11
What is the upper frequency of a signal with a bandwidth of 6Mhz, if the lower frequency limit is 54Mhz?
A. 60Mhz
B. 48Mhz
C. 60Hz
D. 48Hz
Question 12
What is the wavelength of a signal with a frequency of 150Mhz?
A. 10m
B. 2m
C. 5m
D. 20m
Question 13
Which one of the following is not a reason for not using X-rays in communication?
A. Highly attenuated
B. High power is required
C. Stopped by ionizing effects
D. Ionizing radiation
Question 14
Which one of the following is not a source of infrared radiation?
A. Human bodies
B. Light bulbs
C. Sun
D. Books
Question 15
Which organization regulates international EM spectrum division?
A. ITU
B. FCC
C. NTIA
D. WCC
Question 16
A radio can tune to any station in the frequency range from 2.5 MHz to 15 MHz bands. What is the corresponding wavelength band?
A. 30 m to 130 m
B. 40 m to 140 m
C. 20 m to 120 m
D. 10 m to 110 m
Question 17
Electromagnetic radiation has an energy of 15 keV. Then this radiation belongs to which region of electromagnetic waves?
A. X rays
B. Infrared rays
C. Gamma rays
D. UV rays
Question 18
Identify the electromagnetic wave which is also known as heatwaves.
A. Radio Waves
B. Gamma Waves
C. X-Rays
D. Infrared Waves
Question 19
Monica wanted to take photographs of a monument. But since the surrounding is filled with smoke, she is not able to take good photos. Which one of the following electromagnetic waves can be used in this situation to help Monica?
A. X-rays
B. Gamma rays
C. Ultraviolet rays
D. Infrared waves
Question 20
Pick out the correct increasing order of energy of electromagnetic waves from the following.
A. Einfrared < Emicro < Evisible < Eultraviolet < Egamma
B. Emicro < Einfrared < Evisible < Eultraviolet < Egamma
C. Emicro < Einfrared < Evisible < Egamma < Eultraviolet
D. Emicro < Einfrared < Eultraviolet < Evisible < Egamma
Question 21
Pick out the electromagnetic wave which is highly harmful to humans.
A. Radio waves
B. Ultraviolet Rays
C. Microwaves
D. Infrared Waves
Question 22
Stephen is thinking of going to the hospital for checking whether he has tuberculosis since he believes that he may have some early symptoms of the disease. His friend suggests him to do an x-ray checkup to clear up the confusion. Is the suggestion made by Stephen’s friend going to help him?
A. True
B. False
Question 23
On what basis is the classification of electromagnetic waves done?
A. Electromagnetic spectrum
B. Electric field
C. Magnetic field
D. Propagation constant
Question 24
The speeds of microwaves, infrared waves, and ultraviolet waves are Vm, Vi, and Vu respectively. Identify the correct combination showing the different waves in vacuum.
A. Vm > Vi > Vu
B. Vm = Vi = Vu
C. Vm < Vi < Vu
D. Vm > Vi < Vu
Question 25
What is the full form of UHF?
A. Under heavy frequency
B. Ultra-high frequency
C. Ultra heavy frequency
D. Under high frequency
Question 26
Which among the following has a frequency range of 500 kHz to 1000 MHz?
A. Microwaves
B. Infrared Waves
C. Radio Waves
D. Gamma Rays
Question 27
Which among the following is an application of microwaves?
A. Solar cells
B. Ovens
C. Radiotherapy
D. Burglar alarms
Question 28
Which is the frequency range of gamma rays from the following?
A. 1 × 1018 to 3 × 1022 Hz
B. 3 × 10-18 to 5 × 1022 Hz
C. 3 × 1018 to 5 × 1022 Hz
D. 3 × 10-18 to 5 × 10-22 Hz
Question 29
Which of the following cannot travel in vacuum?
A. Radio waves
B. Gamma Waves
C. Infrared Waves
D. Infrasonic waves
Question 30
EM waves varies from ______ to ________
A. Meters to nano-meters
B. Meters to micro-meters
C. Nano to micro-meters
D. Centimeters to nano-meters
Question 31
Energy of the discrete particles can be given by_______
A. Photons
B. Protoplasm
C. Electrons
D. Neutrons
Question 32
How much wave length is reflected back by the earth surface from the absorbed sun radiation?
A. 0.5meter
B. 0.5 micrometer
C. 0.5 centimeter
D. 0.5 decimeter
Question 33
Optical mechanical scanner is used in which type of electromagnetic waves?
A. X-rays
B. Cosmic waves
C. Radio waves
D. Thermal IR
Question 34
Radio waves are having the longest wavelength among all the electromagnetic waves.
A. False
B. True
Question 35
The formula of energy produced from the body can be given as _________
A. Q = h- c / λ
B. Q = h*c * λ
C. Q = h+ c / λ
D. Q = h*c / λ
Question 36
Which among the following is having more wavelengths?
A. X-rays
B. Cosmic waves
C. Radio waves
D. Gamma rays
Question 37
Which among the following wave is not employed in case of remote sensing?
A. X-ray
B. Visible ray
C. Thermal IR
D. Radio waves
Question 38
Which of the following indicates the correct set of combination in radio waves?
A. Shorter wavelength – high frequency
B. Longer wavelength – less frequency
C. Shorter wavelength – less frequency
D. Longer wavelength – high frequency
Question 39
Which of the following waves can be used in case of remote sensing?
A. UV rays
B. X-rays
C. Gamma rays
D. Visible rays