Class XII

In an amplitude modulated wave for audio frequency of 500 cycles / sec, the appropriate carrier frequency will be:
  1. 50 cycles / sec
  2. 100 cycles / sec
  3. 500 cycles / sec
  4. 50,000 cycles /sec
In Digital type signals, signals can take
  1. only continuous values
  2. only discrete stepwise values
  3. only frequency modulated values
  4. only amplitude modulated values
Electronic communication refers to
  1. transfer of electricity from one point to another
  2. transfer of messages encoded in electrical signals
  3. transfer of information encoded in electrical signals
  4. transfer of information or messages encoded in electrical signals
Noise in electronic communication refers to
  1. Noise produced by sound
  2. Noise produced by whistles
  3. unwanted signals that are mixed up with messages
  4. signals that are amplified for performance
The three elements of a generalized communication system are
  1. Transmitter, multiplier and receiver
  2. Transmitter, noise generator and receiver
  3. Transmitter, transmission channel and receiver
  4. Transmitter, transmission channel and detector
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