Assertion :The watches having hours hand, minutes hand and second hand have least count as 1 ms. Reason: Least count is the measurement that can be measured accurately by an instrument.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
The watches having hour hand, minute hand and second hand have least count as 1 ms is false. Least count is the measurement that can measured accurately by an instrument is true.

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