NICET Construction Materials Testing –
Soils Level I Exam Questions And Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. Which soil particle size is considered clay?
a. 0.05–2.0 mm
b. 0.002–0.05 mm
c. less than 0.002 mm
d. 2.0–4.75 mm
Clay particles are defined as smaller than 0.002 mm, which
contributes to high plasticity and low permeability.
2. What is the purpose of a proctor compaction test?
a. Determine soil shear strength
b. Determine maximum dry density and optimum moisture
content
c. Measure permeability
d. Identify soil type
The Proctor test establishes the maximum density achievable by
compaction at various moisture contents.
3. Which of the following soils has the highest permeability?
a. Clay
b. Silt
c. Sand
, d. Peat
Sand has larger particle sizes and voids, allowing water to flow
more easily.
4. Atterberg limits are used to measure:
a. Soil color
b. Plasticity of fine-grained soils
c. Soil permeability
d. Compaction efficiency
Atterberg limits define the liquid, plastic, and shrinkage limits of
clay and silt soils.
5. Which test determines the load-bearing capacity of soil in place?
a. Sieve analysis
b. Hydrometer analysis
c. Standard Penetration Test (SPT)
d. Atterberg limits
SPT measures resistance to penetration in the field, giving an
estimate of soil strength.
6. What is the liquid limit of soil?
a. Moisture content at which soil becomes solid
b. Moisture content at which soil crumbles
c. Moisture content at which soil changes from plastic to liquid
state
d. Moisture content at maximum dry density
Liquid limit marks the water content where soil begins to behave
as a liquid.
7. Which soil is most likely to experience significant swelling?
a. Sand
, b. Gravel
c. Montmorillonite clay
d. Silt
Montmorillonite clay expands and contracts significantly with
moisture changes.
8. What is the main purpose of a sieve analysis?
a. Determine soil plasticity
b. Measure shear strength
c. Determine particle size distribution of coarse-grained soils
d. Measure consolidation
Sieve analysis separates soil into different size fractions to classify
coarse-grained soils.
9. What is the primary difference between cohesive and
cohesionless soils?
a. Color
b. Presence of significant clay content and plasticity
c. Permeability
d. Moisture content
Cohesive soils (clays) have plasticity due to clay minerals;
cohesionless soils (sands, gravels) do not.
10. A hydrometer analysis is used for:
a. Determining particle size distribution of fine-grained soils
b. Measuring compaction
c. Identifying organic content
d. Measuring permeability
Hydrometer analysis measures settling rates of fine particles (silt
and clay) in water.
Soils Level I Exam Questions And Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. Which soil particle size is considered clay?
a. 0.05–2.0 mm
b. 0.002–0.05 mm
c. less than 0.002 mm
d. 2.0–4.75 mm
Clay particles are defined as smaller than 0.002 mm, which
contributes to high plasticity and low permeability.
2. What is the purpose of a proctor compaction test?
a. Determine soil shear strength
b. Determine maximum dry density and optimum moisture
content
c. Measure permeability
d. Identify soil type
The Proctor test establishes the maximum density achievable by
compaction at various moisture contents.
3. Which of the following soils has the highest permeability?
a. Clay
b. Silt
c. Sand
, d. Peat
Sand has larger particle sizes and voids, allowing water to flow
more easily.
4. Atterberg limits are used to measure:
a. Soil color
b. Plasticity of fine-grained soils
c. Soil permeability
d. Compaction efficiency
Atterberg limits define the liquid, plastic, and shrinkage limits of
clay and silt soils.
5. Which test determines the load-bearing capacity of soil in place?
a. Sieve analysis
b. Hydrometer analysis
c. Standard Penetration Test (SPT)
d. Atterberg limits
SPT measures resistance to penetration in the field, giving an
estimate of soil strength.
6. What is the liquid limit of soil?
a. Moisture content at which soil becomes solid
b. Moisture content at which soil crumbles
c. Moisture content at which soil changes from plastic to liquid
state
d. Moisture content at maximum dry density
Liquid limit marks the water content where soil begins to behave
as a liquid.
7. Which soil is most likely to experience significant swelling?
a. Sand
, b. Gravel
c. Montmorillonite clay
d. Silt
Montmorillonite clay expands and contracts significantly with
moisture changes.
8. What is the main purpose of a sieve analysis?
a. Determine soil plasticity
b. Measure shear strength
c. Determine particle size distribution of coarse-grained soils
d. Measure consolidation
Sieve analysis separates soil into different size fractions to classify
coarse-grained soils.
9. What is the primary difference between cohesive and
cohesionless soils?
a. Color
b. Presence of significant clay content and plasticity
c. Permeability
d. Moisture content
Cohesive soils (clays) have plasticity due to clay minerals;
cohesionless soils (sands, gravels) do not.
10. A hydrometer analysis is used for:
a. Determining particle size distribution of fine-grained soils
b. Measuring compaction
c. Identifying organic content
d. Measuring permeability
Hydrometer analysis measures settling rates of fine particles (silt
and clay) in water.
