$1 \, kg \, m^{-3} = \dots \, g \, cm^{-3}$

How many significant figures are present in $7.964 \times 10^{3}$?

At what temperature will the values of $^\circ C$ and $^\circ F$ be equal?

How many significant figures should be present in the answer of the following calculations?
$(i)$ $\frac{0.02856 \times 298.15 \times 0.112}{0.5785}$
$(ii)$ $5 \times 5.364$
$(iii)$ $0.0125 + 0.7864 + 0.0215$

The $SI$ unit of pressure is

One fermi is $....$ (in $cm$).