Allied & ICAR Exam Bank • ALLIED_1178 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Soil Erosion Mechanics and USLE

Subtopic: Soil Erodibility

Question Statement:

In the USLE nomograph, soil erodibility factor $K$ is highest for soils with high contents of:

Options:

  • (A) Silt and very fine sand
  • (B) Organic matter
  • (C) Coarse gravel
  • (D) Active swelling montmorillonite clay

Answer Key:

A

Step-by-Step Solution & Explanation

Medium textured soils rich in silt and very fine sand lack cohesion (unlike clay) and are easily detached, while also sealing soil surface pores, yielding the highest $K$ erodibility values.
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