Question:
Choose the correct statement :
Choose the correct statement :
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In AM the carrier amplitude follows the message signal; in FM the carrier frequency follows it.
Updated On: Nov 11, 2026
- In amplitude modulation the amplitude of the high frequency carrier wave is make to vary in proportion to the amplitude of the audio signal.
- In amplitude modulation the frequency of the high frequency carrier wave is made to vary in proportion to the amplitude of the audio signal.
- In frequency modulation the amplitude of the high frequency carrier wave is made to vary in proportion to the amplitude of the audio signal.
- In frequency modulation the amplitude of the high frequency carrier wave is made to vary in proportion to the frequency of the audio signal.
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The Correct Option is A
Solution and Explanation
Amplitude modulation: the amplitude of the high-frequency carrier is varied in proportion to the instantaneous amplitude of the audio (message) signal, with the carrier frequency unchanged.
Frequency modulation: the frequency of the carrier is varied in accordance with the audio signal, with the carrier amplitude constant.
Option (1) states AM correctly; (2) wrongly says AM varies frequency; (3) and (4) wrongly say FM varies the carrier amplitude.
Answer: (1) In amplitude modulation the amplitude of the high frequency carrier wave is make to vary in proportion to the amplitude of the audio signal.
Frequency modulation: the frequency of the carrier is varied in accordance with the audio signal, with the carrier amplitude constant.
Option (1) states AM correctly; (2) wrongly says AM varies frequency; (3) and (4) wrongly say FM varies the carrier amplitude.
Answer: (1) In amplitude modulation the amplitude of the high frequency carrier wave is make to vary in proportion to the amplitude of the audio signal.
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