Class XII

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
Transmitter is a device that
  1. Inverts the message
  2. Clips the message signal
  3. Makes the message contain parts of the spectrum
  4. Makes the message suitable for transmission and reception
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
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
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
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