Building Construction
Slate

Has a smooth surface and contains alumina and silica
Splits into thin sheets along its bedding planes
Possesses good water absorption capacity
Is a metamorphic rock

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Building Construction
Rotary drilling

Is not economical for holes of less than 10 cm
Is not suitable for deposits containing very coarse gravel
All listed here
Hinders the ground water observations and permeability test

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

All listed here
In organic fine grained silt soil possesses no plasticity
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

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