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The size of interstices in a soil depends on ____________

(a) Particle size

(b) Plasticity index

(c) Soil structure

(d) Angle of contact

I got this question during an interview.

The above asked question is from Capillary Tension, Capillary Potential and Soil Suction topic in division Soil Water Effective and Neutral Stresses of Geotechnical Engineering I

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Right choice is (c) Soil structure

For explanation I would say: Change in structure of the soil, changes the size of interstices in soil, resulting in soil suction variation.

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