Building Construction
Black cotton soil is unsuitable for foundations because its

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

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Building Construction
Mansard roof is a roof which slopes in

Two directions with break in the slope on each side
Two directions without break in the slope on each side
Four directions with break in the slope on each side
Four directions without break in the slope on each side

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