Question

The length, breadth and thickness of a rectangular lamina are $1.024m$, $0.56m$, and $0.0031m$. The volume, in $m^3$, is:

• A. ${1.8\times 10}^{-3}$
• B. ${1.80\times 10}^{-3}$
• C. ${0.180\times 10}^{-4}$
• D. $0.00177$

Answer 1

Answer: (A)

${1.8\times 10}^{-3}$

Volume $=l\times b\times h=1.777664\times {10}^{-3}{m}^3$
Since, the minimum number of significant figures is $2$ (i.e $0.56$) out of all quantities, the answer has to be reported in $2$ significant digits.
$\Rightarrow V=1.8\times {10}^{-3}{m}^3$