Q232
During percussion drilling
A.
Ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole
B.
Caving or mixing of strata are caused in soft soils or cohesion-less soils
C.
The soil to a considerable depth below the bottom of the hole gets disturbed
D.
All the above
AnswerAnswer: Option D
Solution
Answer: Option D
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