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

a tube of about 2 metres length and 20 cm diameter with a cutting edge

a flap valve at the bottom of tube is provided to extract the soil sample

the tube is raised and lowered by 4 thick rope moving over a pulley suspended on a tripod stand

All of the above

Correct Answer : All of the above

Explanation :

* a tube of about 2 metres length and 20 cm diameter with a cutting edge

* a flap valve at the bottom of tube is provided to extract the soil sample

* the tube is raised and lowered by 4 thick rope moving over a pulley suspended on a tripod stand

* the tube is dropped to fall under gravity in side a metalic casing pipe which is driven as the depth of excavation proceeds.

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