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STATEMENT 1 : The audio frequency signal...

STATEMENT 1 : The audio frequency signals (20 Hz to 20 kHz) cannot be transmitted without distortion over long distances
STATEMENT-2: Noise has its greatest effect when the signal is weak

A

Statement-1 is True. Statement-2 is True Statement-2 is a correct explanation for statement-1

B

Statement is True Statement-2 is True Statement-2 is NOT a correct explanation for Statement-1

C

Statement-1 Is True Statement-2 is False

D

Statement-1 is False. Statement 2 is True

Text Solution

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The correct Answer is:
A
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Assertion. Audio signal of frequencuy 10 KHz cannot be transmitted over long distance without modulation. Reason. Length of the antenna required lambda//4 . Should have practical value.

Modulation is the phenomenon of superimposing the low audio frequency base band message or information signals ( called the modulation signals) on a high frequency wave (called, the carrier wave). The resultant wave is called the modulated wave, which is transmitted. Read the above passage and answer the following questions: (i) What are the Audio Frequency and Radio Frequency ranges? (ii) Why audio frequency signals, as such cannot be transmitted over long distance? (iii) What does the phenomemom imply in day to day life ?

Knowledge Check

  • An audio signal of 15 kHz frequency cannot be transmitted over long distance without modulation because.

    A
    the size of the required anteena would be at least 5 km which is not convenient.
    B
    the audio signal cannot be transmitted through sky waves.
    C
    the size of the required antenna would be at least 20 km, which is not convenient.
    D
    effective power transmitted would be very low, if the size of the antenna is less than 5 km

  • STATEMENT-1: In amplitude modulation, the frequency of amplitude variation is much smaller than the frequency of modulated wave STATEMENT-2 : Frequency of the signal is much smaller than the frequency of the carrier wave

    A
    Statement-1 is True. Statement-2 is True
    Statement-2 is a correct explanation for statement-1
    B
    Statement is True Statement-2 is True
    Statement-2 is NOT a correct explanation for Statement-1
    C
    Statement-1 Is True Statement-2 is False
    D
    Statement-1 is False. Statement 2 is True

  • STATEMENT -1 : when an object moves towards a plane mirror with a certain velocity, its image will also move with same velocity. and STATEMENT - 2 : The distance from mirror to image is equal to distance of object from mirror.

    A
    Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement-10
    B
    Statement-1 is True, Statement-2 is True, Statement-2 is NOT a correct explanation for Statement-11
    C
    Statement-1 is True, Statement-2 is false
    D
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