NICET CONSTRUCTION MATERIALS TESTING – SOILS LEVEL II EXAM – PRACTICE QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF.
Core Domains
- Field Testing and Sampling
- Laboratory Testing and Analysis
- Equipment Calibration and Maintenance
- Reporting and Record Keeping
- Safety and Regulatory Compliance
- Soil Classification and Identification
- Compaction and Density Control
- Foundation and Subgrade Preparation
Introduction
The purpose of this assessment is to evaluate the technical competency of individuals seeking Level II
certification in Construction Materials Testing for Soils. This examination assesses the candidate’s proficiency in
performing standard laboratory and field tests, interpreting technical specifications, and applying engineering
principles to soil-related construction activities. The exam structure utilizes multiple-choice and scenario-based
questions to mirror real-world challenges encountered on construction sites. Candidates must demonstrate not
only foundational knowledge of ASTM and AASHTO standards but also critical decision-making skills and a
commitment to professional ethics and safety protocols essential for high-quality infrastructure development.
SECTION ONE: QUESTIONS 1–100
1. When performing a standard Proctor compaction test (ASTM D698), what is the specified weight of the
rammer and the drop height?
,A. 5.5 lb rammer with a 12-inch drop
B. 10.0 lb rammer with a 18-inch drop
C. 5.5 lb rammer with a 18-inch drop
D. 10.0 lb rammer with a 12-inch drop
🟢 A. 5.5 lb rammer with a 12-inch drop
🔴 RATIONALE: ASTM D698 specifies a 5.5 lbf rammer dropped from a height of 12 inches to apply the standard
compactive effort.
2. A soil sample is classified as "well-graded gravel with sand" according to the Unified Soil Classification
System (USCS). Which symbol represents this?
A. GP-SW
B. GW-SW
C. GW
D. SW
🟢 C. GW
🔴 RATIONALE: The symbol GW represents well-graded gravel; the addition of sand is noted in the full name, but
the primary classification is GW based on grain size distribution.
3. Which of the following is the primary reason for performing a "one-point" Proctor test in the field?
A. To determine the absolute maximum dry density of any soil type.
B. To verify if a specific soil matches a previously established moisture-density curve.
C. To replace the need for laboratory testing entirely.
D. To determine the plastic limit of the soil.
,🟢 B. To verify if a specific soil matches a previously established moisture-density curve.
🔴 RATIONALE: A one-point Proctor is used in the field to check if the soil being compacted corresponds to the
moisture-density curve developed in the lab.
4. During a nuclear density test, the "direct transmission" method is generally considered more accurate than
"backscatter" because:
A. It uses a lower amount of radiation.
B. It measures the density of the soil at a specific depth rather than just the surface.
C. It does not require a hole to be drilled in the soil.
D. It is faster to perform.
🟢 B. It measures the density of the soil at a specific depth rather than just the surface.
🔴 RATIONALE: Direct transmission involves inserting the source rod into the soil, allowing the photons to pass
through the material to the detectors, providing a more representative density of the lift.
5. According to ASTM D1557 (Modified Proctor), how many layers is the soil compacted into in a 4-inch or 6-
inch mold?
A. 3 layers
B. 4 layers
C. 5 layers
D. 6 layers
🟢 C. 5 layers
🔴 RATIONALE: The Modified Proctor test (ASTM D1557) requires the soil to be compacted in five equal layers
to achieve the higher compactive effort.
, 6. If a technician discovers that a nuclear density gauge has a damaged handle that won't lock the source rod
in the "safe" position, what is the immediate required action?
A. Tape the handle down and finish the day's testing.
B. Continue using it but keep bystanders 50 feet away.
C. Cease use immediately, secure the rod in the shielded position if possible, and notify the RSO.
D. Only use the backscatter position as it is safer.
🟢 C. Cease use immediately, secure the rod in the shielded position if possible, and notify the RSO.
🔴 RATIONALE: Safety regulations and ALARA principles require that a malfunctioning gauge that cannot secure
the source must be taken out of service and reported to the Radiation Safety Officer.
7. Which soil type is most likely to exhibit "pumping" under heavy equipment traffic when the moisture content
is above optimum?
A. Clean, well-graded gravel
B. Non-plastic sand
C. Fine-grained silts and clays
D. Crushed rock base
🟢 C. Fine-grained silts and clays
🔴 RATIONALE: Saturated or over-optimum fine-grained soils have low permeability and lose shear strength,
causing the "pumping" or deflection behavior under loads.
8. When drying a soil sample for a moisture content determination (ASTM D2216), what is the standard oven
temperature?
CORRECT ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES 2026 Q&A | INSTANT DOWNLOAD PDF.
Core Domains
- Field Testing and Sampling
- Laboratory Testing and Analysis
- Equipment Calibration and Maintenance
- Reporting and Record Keeping
- Safety and Regulatory Compliance
- Soil Classification and Identification
- Compaction and Density Control
- Foundation and Subgrade Preparation
Introduction
The purpose of this assessment is to evaluate the technical competency of individuals seeking Level II
certification in Construction Materials Testing for Soils. This examination assesses the candidate’s proficiency in
performing standard laboratory and field tests, interpreting technical specifications, and applying engineering
principles to soil-related construction activities. The exam structure utilizes multiple-choice and scenario-based
questions to mirror real-world challenges encountered on construction sites. Candidates must demonstrate not
only foundational knowledge of ASTM and AASHTO standards but also critical decision-making skills and a
commitment to professional ethics and safety protocols essential for high-quality infrastructure development.
SECTION ONE: QUESTIONS 1–100
1. When performing a standard Proctor compaction test (ASTM D698), what is the specified weight of the
rammer and the drop height?
,A. 5.5 lb rammer with a 12-inch drop
B. 10.0 lb rammer with a 18-inch drop
C. 5.5 lb rammer with a 18-inch drop
D. 10.0 lb rammer with a 12-inch drop
🟢 A. 5.5 lb rammer with a 12-inch drop
🔴 RATIONALE: ASTM D698 specifies a 5.5 lbf rammer dropped from a height of 12 inches to apply the standard
compactive effort.
2. A soil sample is classified as "well-graded gravel with sand" according to the Unified Soil Classification
System (USCS). Which symbol represents this?
A. GP-SW
B. GW-SW
C. GW
D. SW
🟢 C. GW
🔴 RATIONALE: The symbol GW represents well-graded gravel; the addition of sand is noted in the full name, but
the primary classification is GW based on grain size distribution.
3. Which of the following is the primary reason for performing a "one-point" Proctor test in the field?
A. To determine the absolute maximum dry density of any soil type.
B. To verify if a specific soil matches a previously established moisture-density curve.
C. To replace the need for laboratory testing entirely.
D. To determine the plastic limit of the soil.
,🟢 B. To verify if a specific soil matches a previously established moisture-density curve.
🔴 RATIONALE: A one-point Proctor is used in the field to check if the soil being compacted corresponds to the
moisture-density curve developed in the lab.
4. During a nuclear density test, the "direct transmission" method is generally considered more accurate than
"backscatter" because:
A. It uses a lower amount of radiation.
B. It measures the density of the soil at a specific depth rather than just the surface.
C. It does not require a hole to be drilled in the soil.
D. It is faster to perform.
🟢 B. It measures the density of the soil at a specific depth rather than just the surface.
🔴 RATIONALE: Direct transmission involves inserting the source rod into the soil, allowing the photons to pass
through the material to the detectors, providing a more representative density of the lift.
5. According to ASTM D1557 (Modified Proctor), how many layers is the soil compacted into in a 4-inch or 6-
inch mold?
A. 3 layers
B. 4 layers
C. 5 layers
D. 6 layers
🟢 C. 5 layers
🔴 RATIONALE: The Modified Proctor test (ASTM D1557) requires the soil to be compacted in five equal layers
to achieve the higher compactive effort.
, 6. If a technician discovers that a nuclear density gauge has a damaged handle that won't lock the source rod
in the "safe" position, what is the immediate required action?
A. Tape the handle down and finish the day's testing.
B. Continue using it but keep bystanders 50 feet away.
C. Cease use immediately, secure the rod in the shielded position if possible, and notify the RSO.
D. Only use the backscatter position as it is safer.
🟢 C. Cease use immediately, secure the rod in the shielded position if possible, and notify the RSO.
🔴 RATIONALE: Safety regulations and ALARA principles require that a malfunctioning gauge that cannot secure
the source must be taken out of service and reported to the Radiation Safety Officer.
7. Which soil type is most likely to exhibit "pumping" under heavy equipment traffic when the moisture content
is above optimum?
A. Clean, well-graded gravel
B. Non-plastic sand
C. Fine-grained silts and clays
D. Crushed rock base
🟢 C. Fine-grained silts and clays
🔴 RATIONALE: Saturated or over-optimum fine-grained soils have low permeability and lose shear strength,
causing the "pumping" or deflection behavior under loads.
8. When drying a soil sample for a moisture content determination (ASTM D2216), what is the standard oven
temperature?
