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From which layer of the atmosphere,radio...

From which layer of the atmosphere,radio waves are reflected back?

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Ionosphere.
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MBD -HARYANA BOARD-PRINCIPLES OF COMMUNICATION-Objective Type Questions
  1. From which layer of the atmosphere,radio waves are reflected back?

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  2. The sky wave propagation is suitable for radiowaves of frequency

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  3. Ozone layer is present in

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  4. INSAT-IA satellite is used for :

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  5. A TV tower of height h can broadcast program upto a distance ( given r...

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  6. In UHF range the frequencies are propagated by means of :

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  7. The diameter of an optical fibre is :

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  8. In the process of modulation, the radio frequency wave is known as

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  9. Ozone layer in atmosphere is useful because it :

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  10. The height of a T.V. tower is 100m. If radius of earth is 6400km, then...

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  11. The most commonly used system of modulation for telegraphy is :

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  12. Ionosphere can reflect which type of waves ?

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  13. For television transmission, the frequency employed is normally in the...

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  14. The electromagnetic waves used in the telecommunication are

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  15. the attenution in optical fibre is mainly due to

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  16. The output from a LASER is monochromatic. It means that it is :

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  17. Radio waves of frequency 300MHz-3000MHz belongs to :

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  18. A TV tower has a height of 100m. By how much the height of tower be in...

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  19. Radio waves of constant amplitude can be generated with:

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  20. Radio waves are reflected from which layer of atmosphere ?

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