What are the different types of units?

If $E$ and $H$ represents the intensity of electric field and magnetizing field respectively, then the unit of $\frac{E}{H}$ will be:

Complete the following sentences :

S.I. unit of density is _____

Complete the following sentences :

Density of water is _____ $\mathrm{kg} {\mathrm{m}}^{-3}$.

The density of a body is $500 \mathrm{kg}/{\mathrm{m}}^3$. Then its equivalent value in the CGS system is _____  $\mathrm{g}/{\mathrm{cm}}^3$.

Complete the following sentence:

Density in $\mathrm{kg} {\mathrm{m}}^{-3}$$=$_____$\times \text{density in }\mathrm{g} {\mathrm{cm}}^{-3}$

(Choose from: $0.001 / 0.0001$)