NEET Physics - New - Communication Systems

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Question - 1

A device which converts one type of energy into other is known as

  • A attenuator
  • B transmitter
  • C receiver
  • D transducer

Question - 2

Digital signals

  • A do not provide a continuous set of values
  • B utiliser binary systems
  • C ensures error and noise free communication
  • D All of the above

Question - 3

The number of telephonic messages which are carried by a fibre at an instant with much less intensity loss are

  • A 2400
  • B 2200
  • C 2000
  • D 1800

Question - 4

3-30 MHz frequency range is known as

  • A HF
  • B VHF
  • C UHF
  • D MF

Question - 5

For VHF television broadcasting, the frequency employed is generally

  • A 54-72 MHZz
  • B 420-890 MHz
  • C 540-1600 kHz
  • D 88-108 kHz

Question - 6

The radío waves of frequency 30 MHz to 300 MHz belong to

  • A high frequency band
  • B very high frequency band  
  • C ultra high frequency band
  • D super high frequency band

Question - 7

Range of frequencies allotted for commercial FM radio broadcast is

  • A 88 to 108 MHz
  • B 88 to 108 kHz
  • C 8 to 88 MHz
  • D 88 to 108 GHz

Question - 8

Ozone layer above the earth's atmosphere will not

  • A prevent infrared radiations from sun reaching on the earth
  • B prevent infrared radiations originated from the earth from escaping the earth's atmosphere
  • C prevent ultraviolet rays from the Sun
  • D reflect back radiowaves

Question - 9

In the earth's atmosphere, for F1-layer, the virtual height and critical frequency are

  • A 150 km and 3 MHz
  • B 160 km and 3.5 MHz
  • C 170 km and 4.5 MHz
  • D 180 km and 5 MHz

Question - 10

  • A