ICC Soils Exam 2
Comprehensive Resource To Help You Ace 2026-2027
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! (Current Update!!)
1. Soil becomes anaerobic when oxygen (O₂) concentration falls below
approximately:
A. 10%
B. 5%
C. 3%
D. 1%
Correct Answer: C. 3%
2. Which soil type is most suitable for railroad construction due to lower pore
space and better drainage?
A. Clay
B. Silt
C. Coarse sand
D. Organic soil
Correct Answer: C. Coarse sand
3. Frequent foot traffic on turf results in:
A. Increased pore volume and decreased bulk density
B. Decreased pore volume and increased bulk density
,C. Increased organic matter
D. Increased permeability
Correct Answer: B. Decreased pore space, increased density
4. Carbon dioxide (CO₂) can become toxic to plants in soil when concentrations
reach approximately:
A. 5%
B. 8%
C. 10%
D. 12%
Correct Answer: D. 12%
5. Which of the following does NOT improve soil aggregation?
A. Organic matter addition
B. High irrigation rates
C. Divalent cations
D. Biological activity
Correct Answer: B. High irrigation rates
6. If a substance readily supplies electrons, it undergoes:
A. Oxidation
B. Reduction
C. Neutralization
D. Ionization
Correct Answer: B. Reduction
, 7. As soil particle density decreases:
A. Void space increases
B. Solid volume increases
C. Solid volume decreases
D. Moisture decreases
Correct Answer: C. Solid volume decreases
8. Inorganic molecules are characterized by:
A. Presence of carbon only
B. Lack of charge
C. Absence of carbon and presence of charges
D. High organic content
Correct Answer: C. No carbon, may have charge
9. Knowledge of soil pore size distribution helps improve drainage because:
A. Larger pores increase water retention
B. Medium pores enhance infiltration
C. Small pores dominate water movement
D. All pores behave equally
Correct Answer: B. Medium pores improve drainage
10. Which statement about soil colloids is TRUE?
A. They have no charge
B. They lack surface area
C. They possess an ionic double layer
D. They repel water
Comprehensive Resource To Help You Ace 2026-2027
Includes Frequently Tested Questions With ELABORATED
100% Correct COMPLETE SOLUTIONS
Guaranteed Pass First Attempt!! (Current Update!!)
1. Soil becomes anaerobic when oxygen (O₂) concentration falls below
approximately:
A. 10%
B. 5%
C. 3%
D. 1%
Correct Answer: C. 3%
2. Which soil type is most suitable for railroad construction due to lower pore
space and better drainage?
A. Clay
B. Silt
C. Coarse sand
D. Organic soil
Correct Answer: C. Coarse sand
3. Frequent foot traffic on turf results in:
A. Increased pore volume and decreased bulk density
B. Decreased pore volume and increased bulk density
,C. Increased organic matter
D. Increased permeability
Correct Answer: B. Decreased pore space, increased density
4. Carbon dioxide (CO₂) can become toxic to plants in soil when concentrations
reach approximately:
A. 5%
B. 8%
C. 10%
D. 12%
Correct Answer: D. 12%
5. Which of the following does NOT improve soil aggregation?
A. Organic matter addition
B. High irrigation rates
C. Divalent cations
D. Biological activity
Correct Answer: B. High irrigation rates
6. If a substance readily supplies electrons, it undergoes:
A. Oxidation
B. Reduction
C. Neutralization
D. Ionization
Correct Answer: B. Reduction
, 7. As soil particle density decreases:
A. Void space increases
B. Solid volume increases
C. Solid volume decreases
D. Moisture decreases
Correct Answer: C. Solid volume decreases
8. Inorganic molecules are characterized by:
A. Presence of carbon only
B. Lack of charge
C. Absence of carbon and presence of charges
D. High organic content
Correct Answer: C. No carbon, may have charge
9. Knowledge of soil pore size distribution helps improve drainage because:
A. Larger pores increase water retention
B. Medium pores enhance infiltration
C. Small pores dominate water movement
D. All pores behave equally
Correct Answer: B. Medium pores improve drainage
10. Which statement about soil colloids is TRUE?
A. They have no charge
B. They lack surface area
C. They possess an ionic double layer
D. They repel water
