Building Construction
Pick up the correct statements from the following:

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

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Building Construction
Rotary drilling

Hinders the ground water observations and permeability test
Is not economical for holes of less than 10 cm
All listed here
Is not suitable for deposits containing very coarse gravel

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Building Construction
During percussion drilling

The soil to a considerable depth below the bottom of the hole gets disturbed
All listed here
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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