Building Construction
Black cotton soil is unsuitable for foundations because its

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

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Building Construction
For constructing a terrazzo floor, Pick up the incorrect statement from the following:

After final grinding is over, oxalic acid mixed with water is spread over and rubbed hard with soft material
A 32 mm thick layer of cement concrete (1 : 2 : 4) is laid on the base course and the surface is made smooth by trowelling
A base course is prepared as in cement concrete flooring
Glass strips are driven into the layer according to the pattern required

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