CBSE  /  Class 12  /  Physics  /  Communication Systems

  • 1. 
    The modulation index in amplitude modulation is:

  • Always zero
  • Between 0 and 1
  • Between 1 and ∞
  • None of these

  • 2. 
    The output of a digital computer is an example of:

  • digital signal
  • analog signal
  • both (a) and (b)
  • neither (a) nor (b)

  • 3. 
    Name the man who was first to place his foot on the moon and in which year:

  • Neil Armstrong, 1969
  • James Van A lien, 1971
  • Leonov, 1965
  • None of these

  • 4. 
    A microphone converts:

  • sound signals into electrical signals
  • electrical signals into sound signals
  • both (a) and (b)
  • Neither (a) nor (b)

  • 5. 
    A loudspeaker converts:

  • electrical signals into sound signals
  • sound signals into electrical signals
  • both (a) and (b)
  • neither (a) nor (b)

  • 6. 
    The sound produced by a tuning fork is a sort of:

  • analog signal
  • digital signal
  • both (a) and (b)
  • neither (a) nor (b)

  • 7. 
    The length of a half wave dipole at 30 mega-hertz is:

  • 5 m
  • 10 m
  • 25 m
  • 80 m

  • 8. 
    In space communication, the sound waves can be sent from one place to another:

  • through space
  • through wires
  • by superimposing it on undamped electro-magnetic waves
  • by superimposing it on damped electro-magnetic waves

  • 9. 
    The output of a digital computer is an example of:

  • digital signal
  • analog signal
  • both (a) and (b) above
  • neither (a) nor (b)

  • 10. 
    Which is more advantageous?

  • analog data communication
  • digital data communication
  • both (a) and (b) are equally good
  • depends on the situation
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