In rotator boring ______ is forced down the hallow drillrods.

The properties of soil that are affected by compaction are ______

In open drive samples, the tube is split into two parts.

A ____ sample has preserved natural structure of soil.

The methods of site investigation are dependent upon ____

The method used for studying of horizontal changes in the sub-soil is ___

The depth up to which the increase in pressure due to structural loading is likely to cause perceptible settlement is __…

Thick wall samplers have area ratio______