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The ____________ is the term used to denote a method in which case is driven into the ground and the material inside the casing is washed out and brought to the surface for inspection.(a) Deep boring(b) Percussion boring(c) Rotary drilling(d) Wash boringI got this question by my college director while I was bunking the class.The doubt is from Site Exploration Methods in chapter Site Investigation and Ground Techniques of Construction & Building Materials

Answer» CORRECT choice is (d) Wash boring

Explanation: The process of wash boring consists in driving an INNER tube of DIAMETER 25 mm to 50 mm, INSIDE an outer tube of diameter 100 mm to 150 mm. Whereas, percussion boring and ROTARY drilling are the types of Deep boring.


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