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Engineering Technician

NICET Construction Materials Testing Soils Level IV Exam Practice Test

Soils construction materials testing connects field investigation and laboratory measurements with decisions about earthwork and subsurface behavior. This practice page covers concepts reflected in questions on soil phase relationships, compaction, settlement, seepage, sampling, and field records. These topics help technicians interpret measured conditions and recognize when material differences or observations may affect a project’s geotechnical assumptions.

Exam overview

Exam providerNational Institute for Certification in Engineering Technologies
Exam codeNot listed
CategoryEngineering Technician

About the NICET Construction Materials Testing Soils Level IV Exam

Questions address interpreting elevations and soil properties, calculating relative compaction, and relating water, air, and mineral grains through phase relationships. Other scenarios involve selecting investigation methods to assess soft clay with depth, preserving specimen moisture and fabric for swell testing, and documenting refusal during standard penetration testing. The bank also presents judgment situations: deciding whether settlement parameters remain applicable when a soil source changes, identifying the concern when seepage removes fine particles, and responding to soil that is too dry for compaction. Laboratory context matters too; hydraulic conductivity results are meaningful only alongside conditions such as specimen compaction and hydraulic gradient. Together, these situations exercise calculation, measurement interpretation, sampling awareness, and communication of field conditions relevant to soils work.

Sample Practice Questions

Review a selection from this exam's published US Practice Tests practice bank.

Question 1

A surveyor reports the elevation of a proposed subgrade point. What does the elevation represent?

  1. AThe horizontal distance from the project baseline
  2. BThe vertical position relative to an identified datum
  3. CThe soil's density relative to water
  4. DThe depth of the point below the nearest test location
Show answerCorrect answer: B

An elevation is a vertical position measured relative to a stated datum. Identifying the datum allows elevations to be compared consistently across project records.

Question 2

A contractor proposes using a soil source whose mineralogy and gradation differ substantially from the source used to establish the project’s design settlement parameters. What is the most appropriate technical step before relying on those parameters for the new material?

  1. AUse the existing parameters if the new soil has similar color and odor
  2. BObtain representative samples and perform the relevant characterization and engineering tests for the proposed material
  3. CApply a fixed reduction to all existing parameters without further testing
  4. DUse field penetration resistance alone to establish the new settlement parameters
Show answerCorrect answer: B

Engineering parameters are material- and condition-dependent. A materially different source should be sampled representatively and evaluated with appropriate tests before existing design values are applied.

Question 3

A project requires excavation support in a soil deposit where groundwater seepage is carrying fine particles into the excavation. What is the principal geotechnical concern with continued loss of those particles?

  1. AThe soil’s specific gravity will necessarily increase
  2. BInternal erosion may progress, causing loss of ground and instability
  3. CThe plasticity index will immediately become zero
  4. DThe soil will become more resistant to seepage as fines are removed
Show answerCorrect answer: B

Seepage that transports soil particles can cause piping or internal erosion. Continued loss of ground may undermine support and create instability, so the condition warrants prompt evaluation and control.

Question 4

A project specification requires a soil layer to achieve at least 95% of the maximum dry unit weight determined by a specified laboratory compaction test. The field dry unit weight is 18.1 kN/m³, and the laboratory maximum dry unit weight is 19.0 kN/m³. What is the relative compaction?

  1. A90.5%
  2. B95.3%
  3. C104.9%
  4. D1.05%
Show answerCorrect answer: B

Relative compaction is field dry unit weight divided by laboratory maximum dry unit weight, multiplied by 100: (18.1/19.0) × 100 = 95.3%. It meets the stated 95% requirement.

Question 5

A soil mass contains mineral grains, water, and air. In a standard three-phase soil model, which relationship defines the degree of saturation?

  1. AVolume of water divided by volume of voids
  2. BVolume of solids divided by total volume
  3. CMass of water divided by mass of solids
  4. DVolume of air divided by volume of solids
Show answerCorrect answer: A

Degree of saturation is the ratio of water volume to total void volume, usually expressed as a percentage. It describes how much of the soil's void space is occupied by water.

Question 6

A site investigation is planned where soft clay may undergo settlement under a proposed building. Which investigation approach best supports evaluating how soil properties vary with depth?

  1. ACollect one disturbed sample at the ground surface and apply its properties to the full deposit
  2. BAdvance borings to suitable depths and obtain samples or in-situ measurements at documented intervals
  3. CRely solely on visual observations of the ground surface
  4. DMeasure groundwater elevation once and infer the clay's strength profile
Show answerCorrect answer: B

Borings with samples or in-situ measurements at documented depths help establish stratigraphy and characterize changes in soil properties. The investigation depth and methods should be selected for the project conditions.

Question 7

A soil specimen is being prepared for a one-dimensional swell test. Why is it important to preserve the specimen’s in-place moisture condition and fabric during sampling and handling?

  1. ADisturbance can alter the specimen’s response to wetting and therefore the measured swell behavior
  2. BThe specimen must remain saturated so the ring can be inserted
  3. CMaintaining the original condition ensures the test measures only grain specific gravity
  4. DMoisture preservation is needed solely to prevent the specimen from losing dry mass
Show answerCorrect answer: A

Swell response can depend strongly on initial water content, density, stress history, and fabric. Avoiding unnecessary disturbance helps the test represent the material’s field condition.

How to use this practice test

Access the free practice questions in sessions of up to 20 randomly selected items from the 50-question bank. After submitting a session, review the results to identify concepts that need closer attention, such as compaction calculations, specimen handling, or interpretation of field observations.

Preparation tips

  • Practice relative compaction calculations from field and laboratory dry unit weights, and check whether the result meets a stated percentage criterion.
  • Review soil phase relationships, including degree of saturation, and distinguish water content, void ratio, and unit weight when interpreting measurements.
  • Compare sampling and investigation methods for evaluating soil variation with depth; note why preserving in-place moisture and fabric matters for swell testing.
  • For seepage and excavation scenarios, consider how loss of fine particles can affect soil stability, and record the observations that characterize SPT refusal.
  • When interpreting hydraulic conductivity or settlement information, identify specimen condition and material-source differences that may limit how results or design parameters apply.
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