Tar is not used now because of ______

Tar is a by-product of ______

A good soil should have ______

Coefficient of uniformity is ______

The process by which the water voids are removed is called ______

In field, the dry density of soil can be determined by?

The weight of the hammer in modified proctor test apparatus is ______

Montimorrite is a type of mineral which causes expansive behaviour is found in ______