Building Construction
In case of foundations on black cotton soils, the most suitable method to increase the bearing capacity of soils is to

Compact the soil
Drain the soil
Increase the depth of foundation
Replace the poor soil

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

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

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