Question

The length, breadth and thickness of a block are given by $l=12cm,b=6cm$ and $t=2.45cm$. The volume of the block according to the idea of significant figures should be :

• A. $1\times 10^{2}c{m}^3$
• B. $2\times 10^{2}c{m}^3$
• C. $1.763\times 10^{2}c{m}^2$
• D. none of these

Answer 1

Answer: (B)

Using the relation for volume
$V=$ length $\times$ breadth $\times$ thickness
$=12\times 6\times 245$
$=176.4c{m}^3$
$=1.764\times 10^{2}c{m}^3$
The minimum number of significant figures is 1 in breadth.
Hence, the volume will contain only one significant figure.
Therefore, $V=2\times 10^{2}c{m}^3.$