Question

How many significant figures are there in $0.310\times {10}^5\text{m}$ ?

• A. $2$
• B. $3$
• C. $4$
• D. $5$

Answer 1

The correct option is B $3$

We know that,
$1.$ All non-zero digits are significant figures.
$2.$ If measurement is less than $1$ then the terminal zeroes are significant.
$3.$ In scientific notation, $a\times {10}^x$, we consider the significant figures of $a$.
Based on the above rules, there are $3$ significant figures in $0.310\times {10}^5\text{m}$.