In the method of tube boring of soil investigation, the following is essential:
A. A tube of about 2 meters 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. All the above
Answer: Option D
This Question Belongs to Civil Engineering >> Building Construction
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