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What is the effect of adsorbed water on the permeability of soil?

(a) Structural arrangement is varied

(b) Reduced degree of saturation

(c) Size of the particles is diminished

(d) Reduces the pore size

I have been asked this question at a job interview.

This intriguing question comes from Factors Affecting Permeability in chapter Permeability of Geotechnical Engineering I

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Correct option is (d) Reduces the pore size

The explanation is: The adsorbed water surrounding the fine soil particles is not free to move, and reduces the effective pore space available for the passage of water.

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