Allied & ICAR Exam Bank • ALLIED_0452 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Soil Erosion Mechanics and USLE

Subtopic: Soil Erosion Mechanics and USLE

Question Statement:

In wind erosion mechanics, the three modes of particle movement and their approximate proportions of total soil transport are:

Options:

  • (A) Saltation ($50-70\%$), Surface creep ($5-25\%$), and Suspension ($3-40\%$)
  • (B) Suspension ($80\%$), Saltation ($10\%$), Creep ($10\%$)
  • (C) Creep ($70\%$), Saltation ($20\%$), Suspension ($10\%$)
  • (D) Saltation ($95\%$), Creep ($5\%$), Suspension ($0\%$)

Answer Key:

A

Step-by-Step Solution & Explanation

Saltation (bouncing grains $0.1-0.5\text{ mm}$) accounts for $50-70\%$; surface creep (rolling grains $0.5-1.0\text{ mm}$) accounts for $5-25\%$; suspension (dust
lt;0.1\text{ mm}$) accounts for $3-40\%$.
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