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

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

Rotary boring can also be called as _______

In Dutch cone test, the angle of vector of cone is ____

In Dutch cone test, the cone along with mantle is further penetrated after 8cm to a depth of ____

The sampler in standard penetration test has outer diameter of _____ mm.

The sample in standard penetration test has inner diameter of _____ mm.

The undistributed samples are obtained by __