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Bihar Board Class 12 (Science) Communication Systems — practice questions

Explore 65 free Communication Systems questions in Bihar Board Class 12 (Science) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Communication Systems questions and exercises with answers

Showing questions 1–30 of 65.

Which device acts as an input transducer in a communication system?Read the answer and worked solution →Which of these is an output transducer?Read the answer and worked solution →An input transducer converts a voice into what kind of signal?Read the answer and worked solution →What does an output transducer do to the received electric signal?Read the answer and worked solution →Where is the signal released as electromagnetic waves in a transmitter?Read the answer and worked solution →Which medium is a guided channel in communication?Read the answer and worked solution →What is a communication channel?Read the answer and worked solution →What is the main goal of a receiver?Read the answer and worked solution →Which pair of input and output transducers handles audio signals?Read the answer and worked solution →A radio system propagates oscillations through which medium?Read the answer and worked solution →Which communication system uses light as its transmission medium?Read the answer and worked solution →How do power-line communication systems carry information?Read the answer and worked solution →A duplex communication system allows communication in which way?Read the answer and worked solution →Modulation is the process of doing what to a periodic waveform?Read the answer and worked solution →The message signal is impressed onto which wave in modulation?Read the answer and worked solution →Why are carrier waves needed for low-frequency messages?Read the answer and worked solution →A radio antenna usually needs a length of what fraction of the wavelength?Read the answer and worked solution →Low-frequency radio waves have wavelengths on the scale ofRead the answer and worked solution →Cable television carries many channels on one cable usingRead the answer and worked solution →The word modem is formed from which two terms?Read the answer and worked solution →The inverse of modulation is calledRead the answer and worked solution →The lower frequency band occupied by the modulating signal is calledRead the answer and worked solution →In amplitude modulation, which carrier property is varied by the message?Read the answer and worked solution →Which carrier property changes in FM according to the message?Read the answer and worked solution →In phase modulation, what is varied according to the message?Read the answer and worked solution →Which keying method represents data by changing carrier amplitude?Read the answer and worked solution →Which scheme varies both amplitude and phase to send several bits per symbol?Read the answer and worked solution →Which technique splits data over closely spaced sub-carriers?Read the answer and worked solution →In binary FSK, what do the two frequencies represent?Read the answer and worked solution →In digital modulation, an analog carrier is modulated by what kind of signal?Read the answer and worked solution →

Worked practice questions

Which device acts as an input transducer in a communication system?

  1. Monitor screen
  2. Microphone
  3. Loudspeaker
  4. Electric motor
Show answer and solution

Correct answer: B. Microphone

A microphone captures sound, a non-electric source, and turns it into an electrical signal.

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Which of these is an output transducer?

  1. Camera
  2. Keyboard
  3. Loudspeaker
  4. Microphone
Show answer and solution

Correct answer: C. Loudspeaker

A loudspeaker converts the received electrical audio signal back into sound.

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An input transducer converts a voice into what kind of signal?

  1. Radio wave
  2. Electric signal
  3. Light pulse
  4. Magnetic flux
Show answer and solution

Correct answer: B. Electric signal

Voice is a non-electric signal, so the input transducer changes it into an electric signal for transmission.

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