Building Construction
During percussion drilling

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
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
Single Flemish bond consists of

English bond facing and double Flemish bond backing in each course
Double Flemish bond facing and header bond backing in each course
Stretcher bond facing and double Flemish bond backing in each course
Double Flemish bond facing and English bond backing in each course

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Building Construction
Pick up the correct statements from the following:

Excessive thermal variations in the backing or plaster causes the plaster to fall
In brick work, the efflorescence is removed by applying a solution of zinc sulphate and water
Cracks appear on the plastered surface in the form of hair cracks
All listed here

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