The number of significant figures in the simplification of $\frac{0.501}{0.05}(0.312-0.03)$ is

If the length of a rod is measured as $830600 \ mm$,then the number of significant figures in the measurement is

$A$ cube has a side of length $1.2 \times 10^{-2} \; m$. Calculate its volume.

The radius of a disc is $1.2 \; cm$. Its area according to the concept of significant figures will be given by

In an experiment on a simple pendulum to determine the acceleration due to gravity,a student measures the length of the thread as $63.2 \,cm$ and the diameter of the pendulum bob as $2.256 \,cm$. The student should take the length of the pendulum to be ........... $cm$.

For the four sets of three measured physical quantities as given below,which of the following options is correct?
$(i)$ $A_{1}=24.36, B_{1}=0.0724, C_{1}=256.2$
$(ii)$ $A_{2}=24.44, B_{2}=16.082, C_{2}=240.2$
$(iii)$ $A_{3}=25.2, B_{3}=19.2812, C_{3}=236.183$
$(iv)$ $A_{4}=25, B_{4}=236.191, C_{4}=19.5$