CBSE  /  Class 12  /  Physics  /  Communication Systems

  • 1. 
    Who undertook the first space walk and in which year?

  • Leonov 1965
  • Neil Armstrong, 1969
  • Rakesh Sharma. 1998
  • None of these

  • 2. 
    The term used “to collect the information about an object and a place without physical contact” is called :

  • modulation
  • communication
  • amplification
  • remote sensing

  • 3. 
    The velocity of electromagnetic wave is:

  • 3 × 105 ms-1
  • 3 × 106 ms-1
  • 3 × 108 ms-1
  • 3 × 1010 ms-1

  • 4. 
    The audio frequencies range from:

  • 20 Hz to 20.000 kHz
  • 20 Hz to 20 kHz
  • 20 kHz to 20.000 kHz
  • None of these

  • 5. 
    The wavelength of a wave of frequency 10 kHz is:

  • 30 m
  • 300 m
  • 30 km
  • 300 km

  • 6. 
    The area served by an antenna of height 100 m is:

  • 109m²
  • 4 × 109 m²
  • 6 × 109m²
  • 8 × 1010m²

  • 7. 
    Which of the following is not transducer?

  • Loudspeaker
  • Amplifier
  • Microphone
  • All

  • 8. 
    The space waves which are affected seriously by atmospheric conditions are:

  • MF
  • HUF
  • VHF
  • UHF

  • 9. 
    An antenna is:

  • Inductive
  • Capacitive
  • Resistive
  • A transformer

  • 10. 
    Broadcasting antenna are generally:

  • Ommi directional type
  • Vertical type
  • Horizontal type
  • None
Report Question
warning
Practice More On Communication Systems
Quiz 1 Quiz 2 Quiz 3
access_time
  Time