Assertion :The precision of a measurement depends on least count of measuring instrument. Reason: Smaller the least count greater is number of significant figures in measurement value.

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
Least count of an instrument is the smallest value which can be measured. Accuracy is the ability to measure the value closer to the correct actual value.Accuracy is affected by the holding position of an instrument, ability to read the right value, temperature & humidity.
Therefore both assertion and reason are correct explanation for assertion.

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