Building Construction
Auger boring

Is generally employed in cohesive and other self soils above water table
All of these
Is most economical up-to a depth of 5 meters
Is the most primitive method for making a hole in the ground

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Building Construction
Pick up the correct statement about silt soil from the following:

In organic fine grained silt soil possesses no plasticity
The silt soil has particle size from 0.02 mm to 0.06 mm
All listed here
The least plastic type normally consists of more or less equidimensional grains of quartz

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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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