1. Tardigrade
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  3. Physics
  4. Assertion: A number 2.746 rounded off to three significant figures is 2.75, while the number 2.743 would be 2.74. Reason: In rounding off the uncertain digits, the preceding digit is raised by 1 if the insignificant digit to be dropped is more than 5 and is left unchanged if the latter is less than 5.

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Q. Assertion : A number $2.746$ rounded off to three significant figures is $2.75$, while the number $2.743$ would be $2.74$.
Reason : In rounding off the uncertain digits, the preceding digit is raised by $1$ if the insignificant digit to be dropped is more than $5$ and is left unchanged if the latter is less than $5$.

Physical World, Units and Measurements

Solution:

Correct answer is (a) If both assertion and reason are true and reason is the correct explanation of assertion