The significant figures in $3400$ are

$A$ student performs a titration with different burettes and finds titre values of $25.2 \ mL$,$25.25 \ mL$ and $25.0 \ mL$. The number of significant figures in the average titre value is

If an object weighs $275 \ lb$,what is its weight in $kg$? $(1 \ kg = 2.205 \ lb)$

Which is higher: the normal boiling point or the standard boiling point? Provide an example.

Name the different systems of measurement used.

Which is the heaviest among the following?