Home
Class 12
PHYSICS
Consider telecommunication through optic...

Consider telecommunication through optical fibres. Which of the following statements is not true?

A

Optical fibres may have homogeneous core with a suitable cladding

B

Optical fibres can be of graded refractive index

C

Optical fibres are subject to electromagnetic interference from outside

D

Optical fibres have extremely low transmission loss

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • HEATING AND CHEMICAL EFFECT OF CURRENT

    ERRORLESS |Exercise Self Evaluation Test|14 Videos
  • MAGNETIC EFFECT OF CURRENT

    ERRORLESS |Exercise Exercise|394 Videos
ERRORLESS -KINETIC THEORY OF GASES-QUESTIONS
  1. The waves used in telecommunication are

    Text Solution

    |

  2. In an FM system a 7kHz signal modulates 108 MHz carrier so that freque...

    Text Solution

    |

  3. Consider telecommunication through optical fibres. Which of the follow...

    Text Solution

    |

  4. The phenomenon by which light travels in an optical fibres is

    Text Solution

    |

  5. Television signal on earth cannot be recevied at distances greater th...

    Text Solution

    |

  6. Advantage of optical fibre

    Text Solution

    |

  7. In frequency modulation

    Text Solution

    |

  8. Audio signal cannot be transmitted because

    Text Solution

    |

  9. In which of the following remote sensing technique is not used?

    Text Solution

    |

  10. For sky wave propagation of a 10 MHz signal, what should be the minimu...

    Text Solution

    |

  11. What should be the maximum acceptance angle at the aircore interface o...

    Text Solution

    |

  12. A sky wave with a frequency 55 MHz is incidnet on D-region of earth's ...

    Text Solution

    |

  13. In a diode AM- detector, the output circuit consist of R=1 k Omega and...

    Text Solution

    |

  14. Consider an optical communication system operating at lambda=800 nm. S...

    Text Solution

    |

  15. A photodetectore is made from a semiconductor. In (0.53)Ga(-0.47)As w...

    Text Solution

    |

  16. A transmitter supplies 9kW to the aerial when unmodulated. The power r...

    Text Solution

    |

  17. The antenna current of an AM transmitter is 8A when only the carrier i...

    Text Solution

    |

  18. The total power content of an AM wave is 1500 W. For 100% modulation, ...

    Text Solution

    |

  19. The total power content of an AM wave is 900 W. For 100% modulation, t...

    Text Solution

    |

  20. The modulation index of an FM carrier having a carrier swing of 200kHz...

    Text Solution

    |