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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. | |