Building Construction
Negative skin friction

Develops due to lowering of ground water
Both (A) and (B)
Is a downward drag acting on a pile due to downward movement of the surrounding compressible soil relative to the pile
Neither (A) not (B)

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Building Construction
Auger boring

All of these
Is generally employed in cohesive and other self soils above water table
Is most economical up-to a depth of 5 meters
Is the most primitive method for making a hole in the ground

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