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Statement-1: Communication in UHF/VHF re...

Statement-1: Communication in UHF/VHF regions can be established by space wave or tropospheric wave.
Statement-2 : The refractive index of the ionosphere becomes very high for frequencies higher than the critical frequency.

A

Statement-1 is true: Statement-2 is true, and Statement-2 is correct explanation of Statement-1.

B

Statement-1 is true, Statement-2 is true, but Statement-2 is not a correct explanation of Statement-1.

C

Statement-1 is true, but Statement-2 is false.

D

Statement-1 is false, but Statement-2 is true.

Text Solution

Verified by Experts

Both the statements are true but statement-1 as not correct explanation of statement-1 as UHF//VHF waves being of high frequency are not reflected by ionosphere.
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Statement-1 : Electromagnetic waves with frequencies smaller than the critical frequency of ionosphere cannot be used for communications using sky wave propagation. Statement-2: The refractive index of the ionosphere becomes very high for frequenceis higher than the criritcal frequency.

Assertion : Electromagentic waves with frequencies more than the cirtical frequency of ionosphere cannot be used for communication using sky wave propagation. Reason : The refractive index of the ionosphere becomes very high for frequencies higher than the critical frequency .

Assertion : communication in UHF/ VHF regions can be established by space wave of tropospheric wave . Reason : Communiacation in UHF/ VHF regions is limited to line of singht distance.

Assertion : Communication in UHF/ VHF regions can be established by space wave or tropospheric wave. Reason : Communication is UHF/VHF regions in not limited to line of sight distance but can be achieved for very large distances

Statement-I : Electromagnetic waves with frequencies smaller than the critical frequency of ionosphere cannot be used for communication using sky wave propagation Statement-II : The refractive index of the ionosphere becomes very high for frequency.

Statement-1: Television signals are received through skywave propagation. Statement-2: The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical requency.

Statement-I : Television signals are received through sky-wave propagation Statement-II : The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.

PRADEEP-COMMUNICATION SYSTEMS-Exercise
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  2. Statement-1 : Electromagnetic waves with frequencies smaller than the ...

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  3. Statement-1: Communication in UHF/VHF regions can be established by sp...

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  4. The question has statement - 1 and statement - 2 Of the four choices ...

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  5. What is meant by quantisation of charge ?

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  6. Why is the conductivity of n-type semiconductor greater than that of t...

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  7. How does one explain the emission of electrons from a photosensitive s...

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  8. A resistor of 5 Omega is connected in series with a parallel combinati...

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  10. Under what situation a magnet suspended in a uniform magnetic field wi...

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  11. A man's shortest distance of distinct vision is 20 cm. What wil be the...

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  12. If the base region of a transistor is made large, as compared to a usu...

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  13. The maximum kinetic energies of photoelectrons emitted from a metal ar...

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  14. An electric dipole of length 4 cm, when placed with its axis making an...

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