Building Construction
Rotary drilling

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

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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
Excessive thermal variations in the backing or plaster causes the plaster to fall
All listed here
Cracks appear on the plastered surface in the form of hair cracks

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