Building Construction
Which one of the following activities is not correct as applicable to brick corbels

Stretcher bond is generally used for the construction of brick corbel
The maximum projection of the corbel should not be more than the thickness of the wall
The maximum projection of each corbel course should be limited to a quarter brick at a time
The discontinuous corbels are used to carry heavy concentrated loads

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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
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

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