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  4. The uncertain digit in the measurement of a length reported as 41.68 cm is

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Q. The uncertain digit in the measurement of a length reported as $41.68\, cm$ is

Physical World, Units and Measurements

Solution:

$41.68\, cm$
The rightmost digit is most insignificant and leftmost is most significant.
So, $8 \rightarrow$ most insignificant
$4 \rightarrow$ most significant