Building Construction
During percussion drilling

Caving or mixing of strata are caused in soft soils or cohesion-less soils
All listed here
The soil to a considerable depth below the bottom of the hole gets disturbed
Ground water observations are hindered due to entry of the slurry in the soil below the bottom of the hole

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Building Construction
Pick up the correct statement about silt soil from the following:

All listed here
In organic fine grained silt soil possesses no plasticity
The least plastic type normally consists of more or less equidimensional grains of quartz
The silt soil has particle size from 0.02 mm to 0.06 mm

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Building Construction
Negative skin friction

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

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