The number of significant figures in $60.0001$ is

Convert the following pressure values into atmosphere $(atm)$:
$(a)$ $735 \ torr$
$(b)$ $985 \ mbar$
$(c)$ $1.42 \times 10^5 \ Nm^{-2}$

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.

$25^{\circ} C$ temperature in Fahrenheit and Kelvin scales are respectively:

$2 \times 10^{8}$ atoms of carbon are arranged side by side. Calculate the radius of a carbon atom if the length of this arrangement is $2.4 \, cm$.

If the density of a solution is $3.12 \ g/mL$,the mass of $1.5 \ mL$ solution in significant figures is ............ $g$