Find the number of electrons that generate $1$ coulomb charge?

One calorie is equal to (in $J$)

The density of mercury is $13.6 \, g/cm^3$. Find the mass of $1 \, L$ of mercury. (in $, g$)

Provide the full forms for the following:
$(i)$ $CGPM$
$(ii)$ $amu$
$(iii)$ $u$

Fill in the blanks given below:
$(i)$ At ........ ${\,^\circ }{\text{C}}$,the values of temperature in both ${\,^\circ }{\text{C}}$ and ${\,^\circ }{\text{F}}$ are equal.
$(ii)$ The number of significant figures in $0.03$ is .....
$(iii)$ The closeness of various measurements for the same quantity is called .........
$(iv)$ The agreement of a particular value to the true value of the result is called ....

Among the following,the correct statement is