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MCQs

Communication Systems(12th Grade -Physics)

Total Questions : 167 | Page 17 of 17 pages
Question 161. DVD uses
  1.    Laser beam for both recording and playback
  2.    Laser beam for recording and video head for playback
  3.    Video head for recording and laser beam for playback
  4.    None of the above
 Discuss Question
Answer: Option A. -> Laser beam for both recording and playback
Question 162. A modem is classified as low speed if data rate handled is
  1.    Upto 100 bps
  2.    Upto 250 bps
  3.    Upto 400 bps
  4.    Upto 600 bps
 Discuss Question
Answer: Option D. -> Upto 600 bps
Question 163. In Pulse Code Modulation system
  1.    Large bandwidth is required
  2.    Quantising noise can be overcome by companding
  3.    Quantising noise can be reduced by decreasing the number of standard levels
  4.    Suffers from the disadvantage of its incompatibly with TDM
 Discuss Question
Answer: Option A. -> Large bandwidth is required
Question 164. A woofer should be fed from the input through a
  1.    Low pass filter
  2.    High pass filter
  3.    Band pass filter
  4.    Band stop filter
 Discuss Question
Answer: Option A. -> Low pass filter
Question 165. A buffer amplifier is
  1.    A double-tuned amplifier
  2.    A high gain amplifier
  3.    A cathode follower stage
  4.    None of the above
 Discuss Question
Answer: Option B. -> A high gain amplifier
Question 166. Which of the following does not cause losses in optical fibre cables?
  1.    Stepped index operation
  2.    Impurities
  3.    Microbending
  4.    Attenuation in glass
 Discuss Question
Answer: Option A. -> Stepped index operation
Question 167. The main function of a balanced modulator is to
  1.    Produce balanced modulation of a carrier wave
  2.    Produce 100% modulation
  3.    Suppress carrier signal in order to create a single-sideband or double sideband
  4.    Limit noise picked by a receiver
 Discuss Question
Answer: Option B. -> Produce 100% modulation

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