About Radio Receivers

Following are some of the multiple choice questions on the Radio Receivers with answers that will help the students in developing their knowledge.

Radio Receivers MCQ

1. True or False: Repeaters are used to extend the effective range on communication

  • True
  • False

2. Which of the following uses radio waves?

  • Mobile phones
  • Satellites
  • Televisions
  • All of the these

3. What is the frequency of a radio wave?

  • low as 1 Hz and as high as 2 gigahertz
  • low as 3 Hz and as high as 6 gigahertz
  • low as 3 Hz and as high as 1 gigahertz
  • None of these

4. What is P25?

  • PSAP Project 25
  • Association of Public Safety Communication Officials International Project 25
  • Inter Radio Frequency
  • Public Safety 25

5. What must radio waves move around? Select the best answer

  • The curvature of Earth
  • The population of people
  • The population of animals
  • Trees and other plants

6. Are radio waves electromagnetic waves

  • True
  • False

7. Which of the following is the SI unit for frequency?

  • Hertz
  • Ampere
  • Minute
  • Kilometer

8. Maximum power transfer occurs when the generator impedance Zi is equal to the load impedance Zl

  • True
  • False

9. The maximum power of typical transistor RF power amplifiers is in what range?

  • Milliwatts
  • Watts
  • Hundreds of Watts
  • Kilowatts

10. What are the properties of a radio wave?

  • frequency
  • amplitude
  • protons
  • Both A & B

11. What are radio waves used for on earth?

  • wireless transmission of sound messages
  • information for communication
  • Both A & B
  • None of these

12. Can radio waves damage your DNA and even lead to cancer?

  • False
  • True

13. Which of the following materials allows the flow of radio waves?

  • conductor
  • inductor
  • insulator
  • resistor

14. Which of the following is the frequency range of radio waves?

  • 300 kHz – 300 GHz
  • 300 GHz - 3 x 1013 Hz
  • 3 x 1013 Hz - 3 x 1015 Hz
  • 3 GHz - 3 x 1021 Hz

15. In which of the following means is radio waves generated and detected?

  • A battery and a microscope
  • A light detector
  • A microphone and Z104 detector
  • A spark-gap transmitters and receivers

16. Which of the following is not a benefit of speech-processing circuits?

  • improved frequency stability
  • increased average output power
  • limited bandwidth (BW)
  • Prevention of overmodulation

17. In a speech-processing circuit, a low-pass filter prevents

  • overdeviation
  • overmodulation
  • high gain
  • excessive signal bandwidth (BW)

18. The Radio Act of 1927 set up the ________ to regulate the airwaves and grant licenses to broadcasters who serve a public interest.

  • Federal Airwaves Commission (FAC)
  • Federal Radio Commission (FRC)
  • Radio Airwaves Commission (FAC)
  • None of these

19. Who first produced radio waves through an oscillator in 1887, which included two coils of wire & transmitting radio waves from one coil to the other?

  • Heinrich Hertz
  • Rick Dees
  • Wilton Meyers
  • Gregory Vincent

20. The following are known scientists. Who among them first predicted that radio waves existed

  • Galileo Galilee
  • Guglielmo Marconi
  • Isaac Newton
  • James Clerk Maxwell

21. Based on the electromagnetic spectrum, which of the following do radio waves have?

  • High frequency and long wavelength
  • High frequency and short wavelength
  • Low frequency and long wavelength
  • Low frequency and short wavelength

22. Janus has to research and give a presentation to his class on among the different types of electromagnetic waves. Which of the following would be impossible for him to work on?

  • Infrared
  • Microwave
  • Radio wave
  • Ultrasound

23. Radio waves use ultra-high frequency band to deliver which of the following?

  • Email
  • Music
  • Signal
  • Text Message

24. Who is the first person to prove that radio waves exist?

  • Heinrich Jazz
  • Henry Hertz
  • Albert Einstein
  • Heinrich Hertz

25. What does GPS tell you?

  • The time
  • Your exact location
  • How much money you have
  • What the weather is like

26. What is the correct way a cell phone call goes out?

  • The phone call goes out, transmits through microwaves, then moves to the central hub. Then the signals go to the nearest tower to the receiver of the call
  • The phone call goes out, transmits through  radio waves, then moves to the central hub. Then the signals go to the nearest tower to the receiver of the call
  • The phone call goes out, transmits through microwaves, then moves to the tower. Then the signals go to the nearest hub to the receiver of the call
  • The phone call just magically gets to the other phone

27. Which waves can reach great distances (Waves go into atmosphere and reflect back to Earth so that can move around the curvature of Earth)?

  • FM
  • AM
  • Radio 
  • Microwaves 

28. In AM waves what remains constant?

  • Frequency 
  • Amplitude 
  • Wavelength 
  • Crests

29. Which waves pass through the atmosphere and they are not reflected back toward Earth?

  • FM
  • AM
  • Radio 
  • Microwa

30. What is orbiting Earth that receive radio, television, and telephone signals and then transmit them around the world?

  • GPS
  • Communication Satellite 
  • Transmitter
  • Cell Phone Tower

31. What is faster the speed of light or the speed of sound?

  • The speed of light
  • The speed of sound

32. What are crests and troughs of a standing wave?

  • Antinodes
  • Nodes
  • Wavelength
  • Resonance 

33. What are points on a standing wave where the amplitude of the wave is zero?

  • Antinodes
  • Nodes
  • Refraction 
  • Reflection

34. How can cell phones make long distance calls?

  • Strong Wifi signal
  • Good reception 
  • Satellite telephone systems
  • The government

35. What types of waves do cell phones use?

  • Radio waves
  • Gamma Rays
  • Microwaves 
  • Ultraviolet Rays

36. How do FM waves travel?

  • As changes in the frequency of the wave
  • As changes in the amplitude of the wave
  • As changes in the wavelength of the wave
  • As changes in the resonance of the wave

37. What relays signals it receives from Earth back to other receivers?

  • Tower
  • Cell Phone
  • Transmitter
  • Power Station

38. What waves carry information to your TV and radio ?

  • Radio
  • Microwaves
  • Gamma
  • AM

39. It is an intense burst of radio-frequency energy lasting for a fraction of a second.

  • Microwave
  • Radio pulse
  • Sound
  • Ultrasound

40. Which theory was confirmed by the discovery of Heinrich Hertz?

  • Galilean Relativity
  • Maxwell’s Electromagnetic Theory
  • Newtonian Mechanics
  • Special Relativity

41. Heinrich Hertz was a famous physicist widely known for his discovery of what?

  • Electromagnetic waves
  • Gravity
  • Magnetism
  • Photons

42. In what part of the transmitter did Hertz see electrical sparks?

  • Battery
  • Conductor
  • Spark-gap
  • Switch

43. Which of the following sparks can produce radio waves?

  • High voltage sparks
  • Low voltage sparks
  • Medium voltage sparks
  • Nominal voltage sparks

44. Hertz (Hz) is an SI unit for which of the following measurement?

  • distance
  • frequency
  • mass
  • time

45. True or False: PSAP’s who are close in geographical proximity are usually assigned different frequencies so they can avoid interference

  • True
  • False

46. What is Radio Interoperability

  • The ability for multiple agencies to converse with one another using common radio frequencies
  • Radio that communicates with the closest radio tower
  • Transmitters and receivers capable of completely independent operation using internal batteries
  • Contains a one-way receiver and decoder that may be individually activated

47. What is Radio Frequency?

  • Radio frequencies radiate from n antenna into space as "waves"
  • Individual frequencies are assigned to radio stations
  • Radio signals are transmitted on specific frequencies
  • All of the Above

48. Which of the following is Mobile Radio

  • Have better transmitting and receiving capabilities than portable radio
  • Radios that are permanently installed in response units vehicles
  • Is less powerful than a portable radio
  • Both A & B

49. What is a Radio?

  • Transmitting information without physical contact between the sender and the receiver
  • Designed for 1 person to talk at a time
  • Frequency energy can be transmitted without wires
  • All of the above

50. History - True or False: The first radio used dots and dashes in certain sequences to send messages

  • True
  • False

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