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 Multiple Choice QuestionsMultiple Choice Questions


A signal wave of frequency 12 kHZ is modulated with a carrier wave of frequency 2.51 MHz. The upper and lower side band frequencies are respectively

  • 2512 kHz and 2508 kHz

  • 2522 kHz and 2488 kHz

  • 2502 kHz and 2498 kHz

  • 2522 kHz and 2498 kHz


The range of frequencies allotted for FM radio is

  • 88 to 108 kHz

  • 88 to 108 MHz

  • 47 to 230 kHz

  • 47 to 230 MHz


If a radio receiver amplifies all the signal frequencies equally well, it is said to have high

  • fidelity

  • distortion

  • sensibility

  • sensitivity


A TV tower has a height of 100 m. What is the maximum distance up to which the TV transmission can be received (R = 8 × 106 m) ?

  • 34.77 km

  • 32.70 km

  • 40 km

  • 40.70 km



Amplitude modulation has

  • one carrier with infinite frequencies

  • one carrier with two side band frequencies

  • one carrier with high frequency

  • one carrier


one carrier with two side band frequencies

Amplitude modulation has one carrier with two side band frequencies. The AM wave contains three frequences fc (fc + fm) and (fc − fm) fc is called carrier frequency, (fc + fm) is upper side band (USB frequency) and (fc − fm) is lower side band frequency.


The waves used for Line-of-Sight (LOS) communication is

  • sound waves

  • ground waves

  • sky waves

  • space waves


The process of superimposing message signal on high frequency carrier wave is called

  • amplification

  • demodulation

  • transmission

  • modulation


A basic communication system consists of

  1. Transmitter
  2. Information sources
  3. User of information
  4. Channel
  5. Receiver

  • ii, i, iv, v and iii

  • i, ii, iii, iv and v

  • ii, v, i, iv and iii

  • ii, iv, i, iii and v