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If coefficient of permeability of a soil is 10-7 cm/sec. then the soil is:- 
1. Gravel
2. Sand
3. Silt
4. Clay

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Correct Answer - Option 4 : Clay

Explanation:

Permeability is the property of soil to transmit water through it. 

It is usually expressed either as a permeability rate in centimeters per hour (cm/h), millimeters per hour (mm/h), or centimeters per day (cm/d) or as a coefficient of permeability k in meters per second (m/s) or in centimeters per second (cm/s).

For the different soil types as per grain size, the orders of magnitude of permeability are as follows:

Type of soil Permeability (cm/s)
Gravel 1
Coarse sand 1 to 0.1
Medium sand 10-1 to 10​-2
Fine sand 10-2 to 10​-3
Silty sand 10-3 to 10-4
Silt 10-5
 Clay 10-7 to 10-9

 

From the table, Clay has the Coefficient of permeability ranges of 1 × 10– 7 

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