Building Construction
Black cotton soil is unsuitable for foundations because its

Bearing capacity is low
Particles are cohesive
Property to undergo a volumetric change due to variation of moisture content
Permeability is uncertain

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Building Construction
Auger boring

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

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