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  1. Silty clay – clay – sand – gravel sand clay mixture
  2. Sand – gravel sand clay mixture – silty clay – clay
  3. Clay – silty clay – sand – gravel sand clay mixture
  4. Sand – gravel sand clay mixture – clay – silty clay
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Option 3 : Clay – silty clay – sand – gravel sand clay mixture

Explanation:

Fine soils have lower maximum dry density as compared to coarse soils.

Well graded soils have higher maximum dry density as compared to uniform graded soils.

So, the correct sequence in the increasing order of their maximum dry density: Clay – silty clay – sand – gravel sand-clay mixture

With the increase of fine particles in the sand, the OMC decreases, and maximum dry density increases up to a certain extent.

Thereafter any further increase in fine particles will lead to an increase of OMC and a decrease of maximum dry density. 

Further in the modified test, the OMC will be less and maximum dry density will be more compared to that in the standard test. 

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