Class XII

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
Which of these is an example of point to point communication?
  1. TV
  2. FM Radio
  3. AM Radio
  4. Telephony
The cladding which surrounds the fibre core:
  1. Is used to protect the fibre
  2. Is used to reduce interference
  3. Is used to reduce diffraction
  4. Is helps to guide the light signals through the core
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
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
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