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Question
Which one of the following statements is correct?
A.
Grain size is the primary criterion for classification of coarse, as well as fine-grained soil
B.
Grain size is the primary criterion for classification of coarse-grained soils
C.
Plasticity curve classifies coarse grained soils
D.
Plasticity characteristics relate to classification of coarse-grained soils
Answer ( Option B)

Grain size is the primary criterion for classification of coarse-grained soils

Solution

According to unified soil classification system (USCS), the coarse-grained soils are classified on the basis of their grain size distribution and the fine-grained soil (whose behaviour is controlled by plasticity) on the basis of their plasticity characteristics.

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