Building Construction
To obtain good bonding in brick masonry

All of these
Vertical joints in alternate courses are kept in plumb line
First class bricks are used
Bats are used where necessary

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Building Construction
During percussion drilling

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

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