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When the natural state of cohesion-less soil is in its loosest form, its density index ID is equal to ____

a) 0
b) 0.5
c) 1
d) 1.5

Answer: a
Explanation: Cohesion-less soil is in its loosest form will have its void ratio e=emax.
Since ID=\(\frac{(e_{max} – e)}{(e_{max}-e_{min})}\)
ID=\(\frac{(e_{max} – e_{max})}{(e_{max}-e_{min})}\)
ID=0.

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