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(A) : Repeaters are used to extend the r...

(A) : Repeaters are used to extend the range of communication
(R) : Repeater is combination of a receiver and a transmitter.

A

Assertion and reason are true and reason is the correct explanation of assertion

B

Assertion and reason are true but reason is not correct explanation of assertion

C

Assertion is true but reason is false

D

Assertion is false but Reason is true.

Text Solution

Verified by Experts

The correct Answer is:
A
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Perhaps, the most commonly used mode of communication involves use of free space as a communication channel between transmitter and receiver. The various possible modes of using of free space have been described below Ground wave communication : This mode is used for low frequency as at high frequency, losses become large. This is useful for distance of the order of 1 km. Space wave communication: The signals are transmitted directly from transmitter to receiver. There is no limit to upper frequency, but its range is limited to few hundred kilometers. The range depends on the height of transmitting antenna Sky wave communication : The signals are sent towards sky They are reflected back towards earth by ionosphere. Its range can be above 500 km. But, very high frequencies (above 10 MHz) are not reflected back. Satellite communication: The signals that cannot be reflected back by ionosphere are reflected back by satellite. Moon is a passive satellite of earth. The frequency range allotted to FM radio broadcast is 88 MHz to 108 MHz. Which of the following communication channels can be used for its transmission? A. Sky wave communication only B. Space wave communication only C. Satellite communication only D. Either space wave communication or satellite communication

Assertion: Space waves are used for line -of -sight communication. Reason: Space wave travels in a straight line from transmitting antenna to the receiving antenna.

Assertion: Telephony is an example of point-to-point communication mode. Reason: In point to-point communication modes, communication takes place over a link between a single transmitter and a receiver.