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PHYSICS MCQs

Total Questions : 3767 | Page 48 of 377 pages
Question 471. Which of the following is the fastest communication channel?
  1.    Microwave
  2.    Optical fiber
  3.    Radio wave
  4.    All are operating at nearly the same propagation speed
 Discuss Question
Answer: Option A. -> Microwave
Question 472. The layer of atmosphere used for radio-wave transmission is
  1.    Chromosphere
  2.    Troposphere
  3.    Ionosphere
  4.    Stratosphere
 Discuss Question
Answer: Option C. -> Ionosphere
Question 473. In an optical fibre the signal is transmitted
  1.    In a straight line path
  2.    In a curved path
  3.    Due to total internal reflection
  4.    Due to refraction
 Discuss Question
Answer: Option C. -> Due to total internal reflection
Question 474. What frequency range is the high frequency band?
  1.    3 kHz
  2.    3 to 30 MHz
  3.    30 to 300 MHz
  4.    10 GHz
 Discuss Question
Answer: Option B. -> 3 to 30 MHz
Question 475. The Capacity of a communication channel is measured in
  1.    Band rate
  2.    Band width
  3.    Data flow
  4.    Bit capacity
 Discuss Question
Answer: Option B. -> Band width
Question 476. Which among the following waves is used for communication by artificial satellites ?
  1.    Micro waves
  2.    Radio waves
  3.    A. M.
  4.    Frequency of 1016 series
 Discuss Question
Answer: Option A. -> Micro waves
Question 477. The frequency used in TV and radar system lies in
  1.    VHF
  2.    HF
  3.    SHF
  4.    UHF
 Discuss Question
Answer: Option D. -> UHF
Question 478. Choose the most appropriate answer: In which atmospheric layer are the communication satellites located?
  1.    Stratosphere
  2.    Ionosphere
  3.    Troposphere
  4.    Mesosphere
 Discuss Question
Answer: Option B. -> Ionosphere
Question 479. Modem is used mostly for ?
  1.    A modern empty memory modules
  2.    Connecting to internet
  3.    Mostly for file system
  4.    All the above
 Discuss Question
Answer: Option B. -> Connecting to internet
Question 480. If a carrier wave of 1000 kHz is used to carry the signal, the length of transmitting antenna will be equal to ________.
  1.    300 m
  2.    30 m
  3.    3 m
  4.    0.3 m
 Discuss Question
Answer: Option A. -> 300 m

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