NICET Construction Materials Testing – Soils
Level II Practice Exam 2026 | Verified
Questions, Answers & Rationales | Instant
PDF Study Guide
Question 1
Which test is most directly used to determine the field compaction
characteristics of a soil (relative compaction in the field)?
A. Atterberg limits test
B. Proctor compaction test
C. Plate load test (static)
D. Nuclear density gauge test (field density/moisture)
E. California bearing ratio (CBR) test
CORRECT ANSWER: D. Nuclear density gauge test (field density/moisture)
EXPERT RATIONALE: Field compaction and moisture/density relationships are
commonly verified using nuclear gauges (or similar field density methods).
Proctor/CBR relate to lab or design values, while nuclear density targets the in-situ
condition.
Question 2
In the context of soils testing, what is the primary purpose of determining the
Atterberg limits?
A. To measure grain size distribution only
B. To determine soil plasticity and consistency limits
C. To measure shear strength directly
D. To determine hydraulic conductivity directly
E. To measure organic content only
CORRECT ANSWER: B. To determine soil plasticity and consistency limits
,EXPERT RATIONALE: Atterberg limits (liquid limit, plastic limit, plasticity index)
characterize the plasticity/consistency behavior of fine-grained soils, informing
classification and engineering performance.
Question 3
Which compaction curve parameter is obtained in a standard Proctor test (or
modified Proctor)?
A. Maximum unit weight and optimum moisture content relationship
B. Maximum grain size and uniformity coefficient
C. Liquid limit and plastic limit
D. Cohesion intercept from vane shear
E. Swell potential directly without soaking
CORRECT ANSWER: A. Maximum unit weight and optimum moisture
content relationship
EXPERT RATIONALE: Proctor testing produces a relationship between dry unit
weight and moisture content, yielding maximum dry unit weight and optimum
moisture content for compaction.
Question 4
Which soil classification test is intended to determine the relative proportions
of sand, silt, and clay-size particles?
A. Moisture content test
B. Sieve analysis and hydrometer analysis (combined grading approach)
C. Organic content test
D. Soundness test
E. Density bottle calibration test
, CORRECT ANSWER: B. Sieve analysis and hydrometer analysis (combined
grading approach)
EXPERT RATIONALE: Gradation is assessed by sieving for larger fractions and
hydrometer (or similar) methods for finer sizes to establish grain-size distribution.
Question 5
For a soil sample, the moisture content is typically computed as:
A. Dry mass minus wet mass
B. Wet mass divided by dry mass
C. (Mass of water / mass of dry soil) × 100
D. (Mass of dry soil / mass of water) × 100
E. (Total mass / void volume) × 100
CORRECT ANSWER: C. (Mass of water / mass of dry soil) × 100
EXPERT RATIONALE: Water content is defined by the ratio of mass of water to
mass of dry soil, commonly expressed as percent.
Question 6
A soil with a high plasticity index generally indicates:
A. Low fine-grained fraction and low water sensitivity
B. Higher fraction of fines and greater plasticity (water sensitivity)
C. Predominantly coarse gravel with no fines
D. Non-plastic behavior for all moisture ranges
E. Water content equals zero at all times
CORRECT ANSWER: B. Higher fraction of fines and greater plasticity (water
sensitivity)
, EXPERT RATIONALE: Higher plasticity index reflects broader plastic behavior and
usually higher clay content/activity, implying more sensitivity to moisture changes.
Question 7
Which statement best describes shear strength parameters (cohesion and
friction angle) used in design?
A. They are constant for all soils regardless of moisture and density
B. They represent resistance to sliding along a potential failure plane
C. They are determined only from Atterberg limits
D. They are derived solely from gradation data
E. They are measured by compaction only
CORRECT ANSWER: B. They represent resistance to sliding along a potential
failure plane
EXPERT RATIONALE: Cohesion and friction angle describe shear resistance under
normal stress; they help predict stability and bearing capacity behavior.
Question 8
In the context of soil permeability, what unit describes hydraulic
conductivity?
A. Beats per minute (BPM)
B. Meters per minute or centimeters per second (length/time)
C. Degrees Celsius (°C)
D. Newton-meters (N·m)
E. Kilograms (kg)
CORRECT ANSWER: B. Meters per minute or centimeters per second
(length/time)
Level II Practice Exam 2026 | Verified
Questions, Answers & Rationales | Instant
PDF Study Guide
Question 1
Which test is most directly used to determine the field compaction
characteristics of a soil (relative compaction in the field)?
A. Atterberg limits test
B. Proctor compaction test
C. Plate load test (static)
D. Nuclear density gauge test (field density/moisture)
E. California bearing ratio (CBR) test
CORRECT ANSWER: D. Nuclear density gauge test (field density/moisture)
EXPERT RATIONALE: Field compaction and moisture/density relationships are
commonly verified using nuclear gauges (or similar field density methods).
Proctor/CBR relate to lab or design values, while nuclear density targets the in-situ
condition.
Question 2
In the context of soils testing, what is the primary purpose of determining the
Atterberg limits?
A. To measure grain size distribution only
B. To determine soil plasticity and consistency limits
C. To measure shear strength directly
D. To determine hydraulic conductivity directly
E. To measure organic content only
CORRECT ANSWER: B. To determine soil plasticity and consistency limits
,EXPERT RATIONALE: Atterberg limits (liquid limit, plastic limit, plasticity index)
characterize the plasticity/consistency behavior of fine-grained soils, informing
classification and engineering performance.
Question 3
Which compaction curve parameter is obtained in a standard Proctor test (or
modified Proctor)?
A. Maximum unit weight and optimum moisture content relationship
B. Maximum grain size and uniformity coefficient
C. Liquid limit and plastic limit
D. Cohesion intercept from vane shear
E. Swell potential directly without soaking
CORRECT ANSWER: A. Maximum unit weight and optimum moisture
content relationship
EXPERT RATIONALE: Proctor testing produces a relationship between dry unit
weight and moisture content, yielding maximum dry unit weight and optimum
moisture content for compaction.
Question 4
Which soil classification test is intended to determine the relative proportions
of sand, silt, and clay-size particles?
A. Moisture content test
B. Sieve analysis and hydrometer analysis (combined grading approach)
C. Organic content test
D. Soundness test
E. Density bottle calibration test
, CORRECT ANSWER: B. Sieve analysis and hydrometer analysis (combined
grading approach)
EXPERT RATIONALE: Gradation is assessed by sieving for larger fractions and
hydrometer (or similar) methods for finer sizes to establish grain-size distribution.
Question 5
For a soil sample, the moisture content is typically computed as:
A. Dry mass minus wet mass
B. Wet mass divided by dry mass
C. (Mass of water / mass of dry soil) × 100
D. (Mass of dry soil / mass of water) × 100
E. (Total mass / void volume) × 100
CORRECT ANSWER: C. (Mass of water / mass of dry soil) × 100
EXPERT RATIONALE: Water content is defined by the ratio of mass of water to
mass of dry soil, commonly expressed as percent.
Question 6
A soil with a high plasticity index generally indicates:
A. Low fine-grained fraction and low water sensitivity
B. Higher fraction of fines and greater plasticity (water sensitivity)
C. Predominantly coarse gravel with no fines
D. Non-plastic behavior for all moisture ranges
E. Water content equals zero at all times
CORRECT ANSWER: B. Higher fraction of fines and greater plasticity (water
sensitivity)
, EXPERT RATIONALE: Higher plasticity index reflects broader plastic behavior and
usually higher clay content/activity, implying more sensitivity to moisture changes.
Question 7
Which statement best describes shear strength parameters (cohesion and
friction angle) used in design?
A. They are constant for all soils regardless of moisture and density
B. They represent resistance to sliding along a potential failure plane
C. They are determined only from Atterberg limits
D. They are derived solely from gradation data
E. They are measured by compaction only
CORRECT ANSWER: B. They represent resistance to sliding along a potential
failure plane
EXPERT RATIONALE: Cohesion and friction angle describe shear resistance under
normal stress; they help predict stability and bearing capacity behavior.
Question 8
In the context of soil permeability, what unit describes hydraulic
conductivity?
A. Beats per minute (BPM)
B. Meters per minute or centimeters per second (length/time)
C. Degrees Celsius (°C)
D. Newton-meters (N·m)
E. Kilograms (kg)
CORRECT ANSWER: B. Meters per minute or centimeters per second
(length/time)
