The mass of a body of weight $200 \mathrm{gf}$ is______ $\mathrm{g}$.

A pile of identical one rupee coins is placed over a meter scale as shown in the figure. The thickness of a one rupee coin is _____.

$5 \mathrm{litre}$ of a liquid weighs $5 \mathrm{kgf}$. The density of the liquid is _____.

$1 \mathrm{kilogram}$ is equal to _____.

Mass is measured by using a _____.

$1 \mathrm{kg} {\mathrm{m}}^{-3}=$_____.

$1 {\mathrm{m}}^3=\mathrm{\_\_\_\_\_} \mathrm{litre}.$

The whole length of a meter scale is divided into $500$ equal parts then the smallest measurement that can be measured by using the scale is _____.

Which of the following is the CGS unit of energy?