Inverse of matrix $$\left[ {\matrix{ 0 & 1 & 0 \cr 0 & 0 & 1 \cr 1 & 0 & 0 \cr } } \right]$$ is

MPN index is measure of one of the following:

Alkalinity of water can be defined correctly in one of the following ways

If the porosity of a soil sample is 20%, the void ratio is