Building Construction
Rotary drilling

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

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Building Construction
Pick up the correct statements from the following:

All listed here
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
Cracks appear on the plastered surface in the form of hair cracks

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