Building Construction
The position of a brick when laid on its side 9 cm × 9 cm with its frog in the vertical plane, is called

Brick on edge
Brick on end
Brick on bed
Brick held vertically

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Building Construction
During percussion drilling

Caving or mixing of strata are caused in soft soils or cohesion-less soils
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

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