Assertion :In a communication system based on amplitude modulation the modulation index is kept $< 1$ . Reason: It ensures minimum distortion of signal.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
If modulation index is more than one then it will lead to loss of information in the modulating signal. This is due to distortions occuring due to over weighting the contribution of the carrier wave than the modulating signal.
So, both assertion and reason are correct and reason is the correct explanation of assertion.

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