$5 \times 10^2 \, cm = .......... \, dm$

The significant figures in $3400$ are

The sum of three values $12.0$, $19.034$ and $2.0143$ is equal to $X$. The number of significant figures in $X$ is

How many significant figures should be present in the answer of the following calculations?
$(i)$ $\frac{0.02856 \times 298.15 \times 0.112}{0.5785}$
$(ii)$ $5 \times 5.364$
$(iii)$ $0.0125 + 0.7864 + 0.0215$

Which of the following relations for expressing the volume of a sample is not correct?

$A$ picometre is written as