In the Unified Soil Classification System, a soil is generally classified as fine grained when more than what percentage passes the 75 micrometre sieve?
Correct answer: B. 50 percent
- A. 35 percent
- B. 50 percent
- C. 65 percent
- D. 80 percent
Explanation
USCS classifies a soil as fine grained when 50 percent or more of its material passes the No. 200 sieve, which has a 75 micrometre opening. The 35 percent limit is commonly associated with some group classification boundaries, not the basic coarse or fine division.
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About Soil Mechanics and Foundations
Soil mechanics examines index properties, phase relationships, classification, permeability, seepage, compaction, consolidation, shear strength and earth pressure. Foundations apply these principles to bearing capacity, settlement and shallow or deep foundation selection, with clear distinction between compaction, which expels air, and consolidation, which expels water over time.
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