Assertion :The number of significant figures depends on the least count of measuring instrument. Reason: Significant figures define the accuracy of measuring 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 C Assertion is correct but Reason is incorrect
Assertion is correct.
The significant digits determine precision of the instrument, let's say using scale a value read is 1.8 m, using more precise instrument the reading can be 1.83.
Accuracy is closeness of a measured value to actual value, which is independent of measuring instrument least count.

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