In the equation of state of an ideal gas $PV = nRT$,the value of the universal gas constant $R$ depends only on:

Given the numbers: $161 \ cm, 0.161 \ cm, 0.0161 \ cm$. The number of significant figures for the three numbers are

The number of significant figures in $2.0400$ is

What is the $SI$ unit of density?

Which prefix used in the $SI$ system has a multiplier of $10^{-6}$?

Fill in the blanks given below:
$(i)$ The symbol for the quantity of luminous intensity is .......... and the name of its $SI$ unit is ......... .
$(ii)$ The prefixes used for $10^{-18}$ and $10^{18}$ are ............ and ........... respectively.
$(iii)$ The $SI$ unit of density is ......... .
$(iv)$ In the ........ unit of temperature,its negative value is not possible.