CBSE  /  Class 12  /  Physics  /  Communication Systems

  • 1. 
    Communication channel consists of:

  • transmission line only
  • optical fibre only
  • free space only
  • All of the above

  • 2. 
    AM is used for broadcasting because:

  • it is more noise immune than other modulation system
  • it requires less transmitting power compare with other systems
  • its use avoids receiver complexity
  • No other modulation system can provide the necessary bandwidth faithful transmission

  • 3. 
    Digital signals:

  • represents values as discrete steps
  • Do not represents values as discrete steps
  • represent values steps
  • represent random steps

  • 4. 
    Digital signals:

  • deal with all sort of values
  • can use decimal system
  • can use binary system
  • (b) and (c) both

  • 5. 
    Increase in frequency deviation results into:

  • increase in noise of FM receiver
  • decrease in noise of AM receiver
  • increase in noise of Am receiver
  • decrease in noise of FM receiver
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