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General Science

RADIO WAVE PROPAGATION MCQs

Total Questions : 10

Question 1. The speed of radio wave in free space is
  1.    3 x 108 miles/second
  2.    3 x 106 miles/second
  3.    3 x 108 meters/second
  4.    3 x 106 meters/second
 Discuss Question
Answer is Option C. -> 3 x 108 meters/second
Question 2. Radio waves would strongly reflect off
  1.    A flat metallic surface of the right size
  2.    A flat insulating surface of the right size
  3.    A flat dielectric surface of the right size
  4.    A flat body of water
 Discuss Question
Answer is Option A. -> A flat metallic surface of the right size
Question 3. F2 layer of Appleton region acts as a significant reflecting medium for _____ frequency radio waves
  1.    Low
  2.    Moderate
  3.    High
  4.    All of the above
 Discuss Question
Answer is Option C. -> High
Question 4. Which among the following is/are not present in free space?
  1.    Solid bodies
  2.    Ionized particles
  3.    Interference of normal radiation & radio wave propagation
  4.    All of the above
 Discuss Question
Answer is Option D. -> All of the above
Question 5. According to Webster’s dictionary, what is an antenna?
  1.    Impedance matching device
  2.    Sensor of electromagnetic waves
  3.    Transducer between guided wave & free space wave
  4.    Metallic device for radiating or receiving radio waves
 Discuss Question
Answer is Option D. -> Metallic device for radiating or receiving radio waves
Question 6. A 20-dB reduction in the strength of a radio wave due to reflection is called:
  1.    fading
  2.    diffraction
  3.    frequency diversity
  4.    spatial diversity
 Discuss Question
Answer is Option A. -> fading
Question 7. Which among the following is an application of high frequency?
  1.    SONAR
  2.    Subsurface communication
  3.    Radio navigation
  4.    Facsimile
 Discuss Question
Answer is Option D. -> Facsimile
Question 8. Radio wave that is far from its sources is called
  1.    Plane wave
  2.    isotropic wave
  3.    vertical wave
  4.    horizontal wave
 Discuss Question
Answer is Option A. -> Plane wave
Question 9. Mathematical prediction of radio waves was done by
  1.    Einstein
  2.    Hertz
  3.    Faraday
  4.    Maxwell
 Discuss Question
Answer is Option D. -> Maxwell
Question 10. The radio waves were demonstrated experimentally by
  1.    Hertz
  2.    Marconi
  3.    Maxwell
  4.    Armstrong
 Discuss Question
Answer is Option A. -> Hertz
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