ICC Soils Special Inspector Examination
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. The primary purpose of a soils special inspection is to verify that soil-
related construction complies with:
A. Architectural drawings
B. Structural steel standards
C. Approved construction documents and geotechnical report
D. Contractor means and methods
Soils special inspection ensures earthwork complies with approved plans,
specifications, and the geotechnical engineering recommendations.
2. Which document provides site-specific soil recommendations for
foundation design?
A. Building code
B. Structural drawings
, C. Geotechnical engineering report
D. Soil classification chart
The geotechnical report contains subsurface investigation results and
design recommendations.
3. Compaction of soil is primarily intended to:
A. Increase permeability
B. Reduce soil temperature
C. Increase density and load-bearing capacity
D. Improve soil color
Proper compaction increases soil density, strength, and stability while
reducing settlement.
4. The most common field test used to measure soil compaction is:
A. Sieve analysis
B. Hydrometer test
C. Nuclear density test
D. Atterberg limits
The nuclear density gauge is widely used in the field to measure in-place
density and moisture.
, 5. Soil compaction requirements are usually expressed as a percentage
of:
A. Natural density
B. Field density
C. Maximum dry density
D. Saturated density
Compaction is compared to the maximum dry density determined by a
Proctor test.
6. The Standard Proctor test is governed by which ASTM standard?
A. ASTM D698
B. ASTM D1556
C. ASTM D698
D. ASTM D4318
ASTM D698 defines the Standard Proctor compaction test method.
7. The Modified Proctor test differs from the Standard Proctor because
it:
A. Uses less compactive effort
B. Uses higher compactive effort
C. Uses saturated samples
D. Is only performed in the field
, Modified Proctor applies greater energy, resulting in higher maximum dry
density.
8. Which soil type generally requires the highest compactive effort?
A. Organic soil
B. Silty clay
C. Well-graded gravel
D. Peat
Dense granular soils typically require higher compactive effort to achieve
required density.
9. What soil classification system is most commonly referenced in
geotechnical reports?
A. OSHA system
B. Unified Soil Classification System (USCS)
C. AASHTO only
D. ISO classification
USCS is widely used to classify soils based on grain size and plasticity.
10. Which symbol represents clay of low plasticity in USCS?
A. CH
B. CL
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. The primary purpose of a soils special inspection is to verify that soil-
related construction complies with:
A. Architectural drawings
B. Structural steel standards
C. Approved construction documents and geotechnical report
D. Contractor means and methods
Soils special inspection ensures earthwork complies with approved plans,
specifications, and the geotechnical engineering recommendations.
2. Which document provides site-specific soil recommendations for
foundation design?
A. Building code
B. Structural drawings
, C. Geotechnical engineering report
D. Soil classification chart
The geotechnical report contains subsurface investigation results and
design recommendations.
3. Compaction of soil is primarily intended to:
A. Increase permeability
B. Reduce soil temperature
C. Increase density and load-bearing capacity
D. Improve soil color
Proper compaction increases soil density, strength, and stability while
reducing settlement.
4. The most common field test used to measure soil compaction is:
A. Sieve analysis
B. Hydrometer test
C. Nuclear density test
D. Atterberg limits
The nuclear density gauge is widely used in the field to measure in-place
density and moisture.
, 5. Soil compaction requirements are usually expressed as a percentage
of:
A. Natural density
B. Field density
C. Maximum dry density
D. Saturated density
Compaction is compared to the maximum dry density determined by a
Proctor test.
6. The Standard Proctor test is governed by which ASTM standard?
A. ASTM D698
B. ASTM D1556
C. ASTM D698
D. ASTM D4318
ASTM D698 defines the Standard Proctor compaction test method.
7. The Modified Proctor test differs from the Standard Proctor because
it:
A. Uses less compactive effort
B. Uses higher compactive effort
C. Uses saturated samples
D. Is only performed in the field
, Modified Proctor applies greater energy, resulting in higher maximum dry
density.
8. Which soil type generally requires the highest compactive effort?
A. Organic soil
B. Silty clay
C. Well-graded gravel
D. Peat
Dense granular soils typically require higher compactive effort to achieve
required density.
9. What soil classification system is most commonly referenced in
geotechnical reports?
A. OSHA system
B. Unified Soil Classification System (USCS)
C. AASHTO only
D. ISO classification
USCS is widely used to classify soils based on grain size and plasticity.
10. Which symbol represents clay of low plasticity in USCS?
A. CH
B. CL
