If a calculated value $2.7465 \,g$ contains only three significant figures,the two insignificant digits in it are ............

The number of significant figures in all the given numbers $25.12, 2009, 4.156$ and $1.217 \times 10^{-4}$ is

Find the value of $\frac{1.53 \times 0.9995}{1.592}$ with due regard for significant figures.

Keeping the significant figures in view,the sum of the physical quantities $52.01 \ m$,$153.2 \ m$,and $0.123 \ m$ is: (in $m$)

The volume of a cube having sides $1.2 \,m$ is appropriately expressed as ........... $\times 10^6 \,cm^3$.

The mass of a box measured by a grocer's balance is $2.30 \ kg$. Two gold pieces of masses $20.15 \ g$ and $20.17 \ g$ are added to the box. What is
$(a)$ the total mass of the box,
$(b)$ the difference in the masses of the pieces to correct significant figures?