To avoid the setting of the cutting edge unevenly, _______ can be introduced.

When a rigid well starts moving parallel, it transforms the soil in to ______

The essential feature of a pneumatic caissons are ______

When the well is sunk deeper, the skin friction is decreased by which of the following method?

The common types of well shape are _____

Pneumatic caissons are closed at _____ during construction.

The inside shuttering of the well curb is made up of _____

The choice of a particular shape for a well depends on ____