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
Answer: Option D
Related Questions on Building Construction
The window which is provided in flat roof of a room, is known
A. Dormer window
B. Lantern window
C. Louvered window
D. Sky window
Weep holes are provided in retaining and breast walls
A. To drain off the water from the filling
B. To ventilate the stone masonry
C. To add architectural beauty
D. To increase compaction of the earth retained
A. Haunch
B. Spandril
C. Voussoirs
D. Skewbacks
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