The angle of internal friction for fines lesser than 5% is _______

If σ’ is the effective overburden pressure, then the effective penetration resistance is given by _________

Wash boring cannot be used for _____ type of soil strata.

The angle of internal friction for fines greater than 5% is _______

The number and disposition of bore holes are varied, depending upon ___

For undistributed samples __ is used.

Refusal of standard penetration test occurs when the sampler penetrates ____

Which of the following is proved to be useful, ongoing over the site?