Building Construction
During percussion drilling

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

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Building Construction
Auger boring

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

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Building Construction
In English garden wall bond

One course of headers to three or five course of stretchers
Queen closer in provided in each heading course
All of these
The middle course of stretchers is started with a header to give proper vertical joints

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