"Changing the units of measurement does not change the number of significant figures." Explain with an example.

Each side of a metallic cube of mass $5.580 \text{ kg}$ is measured to be $9.0 \text{ cm}$. Keeping the significant figures in view,the density of the material of the cube can be best expressed as $X \times 10^3 \text{ kg m}^{-3}$,where the value of $X$ is:

The length,breadth,and thickness of a block are given by $l = 12 \, cm$,$b = 6 \, cm$,and $t = 2.45 \, cm$. The volume of the block according to the rules of significant figures should be:

The resistance is $10.845 \ \Omega$ and the current is $3.23 \ A$. The voltage is $35.02935 \ V$. Express the result in appropriate significant figures. (in $V$)

If $N_A, N_B$,and $N_C$ are the number of significant figures in $A=0.001204 \ m$,$B=43120000 \ m$,and $C=1.200 \ m$ respectively,then:

$A$ body of mass $m = 3.513\ kg$ is moving along the $x$-axis with a speed of $5.00\ ms^{-1}$. The magnitude of its momentum is recorded as ........ $kg\ m/s$.