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  1.  

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

  2. 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.

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    Answer : Option E

    Explanation :

    No answer description available for this question.


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