Electrical resistivity method is based on measurement of _________

In Seismic refraction method, the radiating shock waves are picked up by __

The properties of soil that are affected by compaction are ______

Mud rotary drilling belongs to _____ type of boring method.

In the electrical resistivity method, the unit of resistivity is ohms-cm.

Hand auger can be used for depths up to ____

The inside clearance of the sampler should ___

The depth of exploration for isolated spread footing is _______