1.

In the method of tube boring of soil investigation, the following is essential :

A. a tube of about 2 metres length and 20 cm diameter with a cutting edge
B. a flap valve at the bottom of tube is provided to extract the soil sample
C. the tube is raised and lowered by 4 thick rope moving over a pulley suspended on a tripod stand
D. the tube is dropped to fall under gravity in side a metalic casing pipe which is driven as the depth of excavation proceeds.
E. all the above.
Answer» F.


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