The uncertain digit in the measurement of a length reported as $41.68 \,cm$ is ...........

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

Time periods of oscillation of the same simple pendulum measured using four different measuring clocks were recorded as $4.62 \,s, 4.632 \,s, 4.6 \,s$ and $4.64 \,s$. The arithmetic mean of these readings in correct significant figures is: (in $\,s$)

What is the number of significant figures in $0.310 \times 10^3$?

The number of significant figures in $3.78 \times 10^{22} \ kg$ is

What points should be considered during the multiplication and division of numbers with significant figures?