ICC Soils EC Material Testing Ultimate Exam
**Question 1. Which ASTM designation is used for the visual-manual classification of soils based on
grain size and plasticity?**
A) D2488
B) D698
C) D1557
D) D1556
Answer: A
Explanation: ASTM D2488 specifies the visual-manual procedure for soil identification, including
grain-size and plasticity observations.
**Question 2. In the Unified Soil Classification System (USCS), the symbol “GW” represents which type
of soil?**
A) Well-graded sand
B) Poorly graded sand
C) Well-graded clay
D) Poorly graded silt
Answer: A
Explanation: “G” denotes granular (sand or gravel) and “W” indicates well-graded.
**Question 3. The liquid limit of a soil is determined by which ASTM test method?**
A) D698
B) D1557
C) D4318
D) D854
Answer: C
Explanation: ASTM D4318 outlines the procedure for measuring the liquid limit, plastic limit, and
plasticity index.
**Question 4. The optimum moisture content (OMC) for a given soil is obtained from which type of
test?**
, ICC Soils EC Material Testing Ultimate Exam
A) Sieve analysis
B) Standard Proctor test
C) Specific gravity test
D) Sand cone test
Answer: B
Explanation: The Standard Proctor test (ASTM D698) determines OMC and maximum dry density.
**Question 5. Which compaction equipment is most suitable for a high-plasticity clay?**
A) Vibratory roller
B) Sheepsfoot roller
C) Pneumatic tire roller
D) Smooth drum roller
Answer: B
Explanation: Sheepsfoot rollers provide kneading action ideal for dense compaction of clays.
**Question 6. The specific gravity of soil solids is measured according to which ASTM standard?**
A) D422
B) D854
C) D1556
D) D6938
Answer: B
Explanation: ASTM D854 describes the method for determining the specific gravity of soil solids.
**Question 7. In the field, which method uses a nuclear gauge to obtain moisture-density readings?**
A) Sand cone method
B) Nuclear method
C) Dynamic cone penetrometer
D) Plate load test
Answer: B
, ICC Soils EC Material Testing Ultimate Exam
Explanation: The nuclear moisture-density gauge (ASTM D6938) provides rapid in-place density
measurements.
**Question 8. A soil classified as “ML” in the USCS is characterized by which of the following?**
A) Low-plasticity silt
B) Low-plasticity clay
C) High-plasticity silt
D) High-plasticity clay
Answer: A
Explanation: “M” denotes silty soils and “L” indicates low plasticity.
**Question 9. Which ASTM test is used to determine the particle-size distribution of coarse aggregates?
**
A) D4318
B) D854
C) C136/D422
D) D698
Answer: C
Explanation: ASTM C136/D422 outlines sieve analysis for aggregate grading.
**Question 10. The Modified Proctor test (ASTM D1557) differs from the Standard Proctor test primarily
in:**
A) Use of a larger mold
B) Higher compaction effort
C) Different moisture measurement technique
D) Testing only fine-grained soils
Answer: B
Explanation: Modified Proctor applies a greater compaction effort to achieve higher densities for heavy
loads.
, ICC Soils EC Material Testing Ultimate Exam
**Question 11. In a sand-cone density test, the volume of sand displaced is used to calculate:**
A) Moisture content only
B) In-place dry density only
C) Both moisture content and dry density
D) Specific gravity of the soil
Answer: C
Explanation: The displaced sand volume, together with the weight of the excavated sample, yields both
moisture content and dry density.
**Question 12. Which of the following best defines the Plasticity Index (PI) of a soil?**
A) Difference between liquid limit and plastic limit
B) Ratio of liquid limit to plastic limit
C) Sum of liquid and plastic limits
D) Moisture content at maximum dry density
Answer: A
Explanation: PI = LL – PL; it quantifies the range of moisture over which the soil exhibits plastic behavior.
**Question 13. According to IBC Chapter 17, a Special Inspection for soil compaction must be performed
by:**
A) The project architect
B) The contractor’s foreman
C) A qualified special inspector
D) The building owner
Answer: C
Explanation: IBC Chapter 17 requires a qualified special inspector to oversee soil compaction
inspections.
**Question 14. When inspecting a drilled shaft, which of the following is NOT a primary focus?**
A) Shaft verticality
B) Bottom cleanliness
**Question 1. Which ASTM designation is used for the visual-manual classification of soils based on
grain size and plasticity?**
A) D2488
B) D698
C) D1557
D) D1556
Answer: A
Explanation: ASTM D2488 specifies the visual-manual procedure for soil identification, including
grain-size and plasticity observations.
**Question 2. In the Unified Soil Classification System (USCS), the symbol “GW” represents which type
of soil?**
A) Well-graded sand
B) Poorly graded sand
C) Well-graded clay
D) Poorly graded silt
Answer: A
Explanation: “G” denotes granular (sand or gravel) and “W” indicates well-graded.
**Question 3. The liquid limit of a soil is determined by which ASTM test method?**
A) D698
B) D1557
C) D4318
D) D854
Answer: C
Explanation: ASTM D4318 outlines the procedure for measuring the liquid limit, plastic limit, and
plasticity index.
**Question 4. The optimum moisture content (OMC) for a given soil is obtained from which type of
test?**
, ICC Soils EC Material Testing Ultimate Exam
A) Sieve analysis
B) Standard Proctor test
C) Specific gravity test
D) Sand cone test
Answer: B
Explanation: The Standard Proctor test (ASTM D698) determines OMC and maximum dry density.
**Question 5. Which compaction equipment is most suitable for a high-plasticity clay?**
A) Vibratory roller
B) Sheepsfoot roller
C) Pneumatic tire roller
D) Smooth drum roller
Answer: B
Explanation: Sheepsfoot rollers provide kneading action ideal for dense compaction of clays.
**Question 6. The specific gravity of soil solids is measured according to which ASTM standard?**
A) D422
B) D854
C) D1556
D) D6938
Answer: B
Explanation: ASTM D854 describes the method for determining the specific gravity of soil solids.
**Question 7. In the field, which method uses a nuclear gauge to obtain moisture-density readings?**
A) Sand cone method
B) Nuclear method
C) Dynamic cone penetrometer
D) Plate load test
Answer: B
, ICC Soils EC Material Testing Ultimate Exam
Explanation: The nuclear moisture-density gauge (ASTM D6938) provides rapid in-place density
measurements.
**Question 8. A soil classified as “ML” in the USCS is characterized by which of the following?**
A) Low-plasticity silt
B) Low-plasticity clay
C) High-plasticity silt
D) High-plasticity clay
Answer: A
Explanation: “M” denotes silty soils and “L” indicates low plasticity.
**Question 9. Which ASTM test is used to determine the particle-size distribution of coarse aggregates?
**
A) D4318
B) D854
C) C136/D422
D) D698
Answer: C
Explanation: ASTM C136/D422 outlines sieve analysis for aggregate grading.
**Question 10. The Modified Proctor test (ASTM D1557) differs from the Standard Proctor test primarily
in:**
A) Use of a larger mold
B) Higher compaction effort
C) Different moisture measurement technique
D) Testing only fine-grained soils
Answer: B
Explanation: Modified Proctor applies a greater compaction effort to achieve higher densities for heavy
loads.
, ICC Soils EC Material Testing Ultimate Exam
**Question 11. In a sand-cone density test, the volume of sand displaced is used to calculate:**
A) Moisture content only
B) In-place dry density only
C) Both moisture content and dry density
D) Specific gravity of the soil
Answer: C
Explanation: The displaced sand volume, together with the weight of the excavated sample, yields both
moisture content and dry density.
**Question 12. Which of the following best defines the Plasticity Index (PI) of a soil?**
A) Difference between liquid limit and plastic limit
B) Ratio of liquid limit to plastic limit
C) Sum of liquid and plastic limits
D) Moisture content at maximum dry density
Answer: A
Explanation: PI = LL – PL; it quantifies the range of moisture over which the soil exhibits plastic behavior.
**Question 13. According to IBC Chapter 17, a Special Inspection for soil compaction must be performed
by:**
A) The project architect
B) The contractor’s foreman
C) A qualified special inspector
D) The building owner
Answer: C
Explanation: IBC Chapter 17 requires a qualified special inspector to oversee soil compaction
inspections.
**Question 14. When inspecting a drilled shaft, which of the following is NOT a primary focus?**
A) Shaft verticality
B) Bottom cleanliness
