NYC ASSISTANT CIVIL ENGINEER EXAM (EXAM NO.
7006)
100 Original Practice Questions, Verified Answers & Rationales
Questions 1–25
1. Which soil property most directly describes the ratio of the volume of voids to the
total volume of a soil sample?
A) Porosity
B) Plasticity index
C) Specific gravity
D) Dry density
Correct Answer: A) Porosity
Rationale: Porosity is the ratio of void volume to total soil volume and is normally
expressed as a percentage. It differs from void ratio, which compares void volume with
solid-particle volume. Understanding these relationships is important when evaluating
groundwater movement, compaction, settlement, and other geotechnical conditions
encountered in civil engineering projects.
2. What is the primary purpose of soil compaction during earthwork construction?
A) Increase organic content
B) Reduce air voids and increase soil density
C) Increase groundwater flow
D) Eliminate all soil moisture
Correct Answer: B) Reduce air voids and increase soil density
Rationale: Compaction mechanically reduces air voids within soil, increasing dry density
and generally improving strength and stiffness. Proper compaction can also reduce
undesirable settlement and permeability. It does not mean removing all water from the soil,
,because some moisture is normally beneficial for achieving the specified compacted
condition.
3. A concrete cylinder test produces a compressive strength below the specified
design strength. Which action is most appropriate initially?
A) Immediately demolish the structure
B) Ignore the result
C) Investigate testing, sampling, curing, and concrete-placement records
D) Increase the concrete strength retroactively
Correct Answer: C) Investigate testing, sampling, curing, and concrete-placement
records
Rationale: A low test result should first be investigated systematically rather than
automatically assuming structural failure. Sampling, specimen preparation, curing, testing
procedures, concrete delivery records, and placement conditions can all affect results.
Engineering evaluation should determine whether additional testing or structural
assessment is warranted before selecting corrective action.
4. Which surveying instrument is commonly used to measure horizontal and vertical
angles electronically and can also measure distances when equipped with an
electronic distance-measuring system?
A) Level rod
B) Measuring tape
C) Plumb bob
D) Total station
Correct Answer: D) Total station
Rationale: A total station integrates electronic angle measurement with electronic distance
measurement and data collection. It is widely used for construction layout, topographic
surveys, control surveys, and as-built documentation. A level primarily establishes
elevations, while a plumb bob establishes vertical alignment and a tape provides direct
linear measurements.
,5. What is the primary engineering purpose of a stormwater detention facility?
A) Temporarily store runoff and control its release
B) Permanently eliminate precipitation
C) Increase peak runoff immediately
D) Convert stormwater into potable water
Correct Answer: A) Temporarily store runoff and control its release
Rationale: Detention facilities temporarily store stormwater and release it at a controlled
rate. This can reduce peak discharge and help manage downstream drainage capacity.
Detention differs from retention, where water is intended to remain stored or infiltrate.
Facility design must consider contributing drainage area, allowable discharge, storage
volume, outlet characteristics, and safety.
6. In reinforced concrete, what is the principal structural role of reinforcing steel in a
typical beam?
A) Resist only corrosion
B) Carry tensile stresses
C) Eliminate concrete shrinkage completely
D) Replace the need for concrete
Correct Answer: B) Carry tensile stresses
Rationale: Concrete is strong in compression but comparatively weak in tension.
Reinforcing steel is therefore strategically placed to resist tensile forces and work
compositely with the concrete. Reinforcement also contributes to crack control and
ductility. Its placement, development, spacing, cover, and anchorage must conform to the
applicable structural design requirements.
7. Which document normally provides the detailed written requirements governing
materials, workmanship, testing, and construction procedures?
, A) Site photograph
B) Daily weather report
C) Technical specification
D) Property tax record
Correct Answer: C) Technical specification
Rationale: Technical specifications establish written requirements for materials,
workmanship, testing, installation, quality, and related construction obligations. Drawings
communicate graphical information, while specifications provide complementary textual
requirements. Engineers and inspectors use both documents together when evaluating
whether construction conforms to the contract requirements.
8. A project engineer discovers that field construction differs materially from the
approved drawings. What should the engineer do first?
A) Conceal the difference
B) Authorize the change verbally without documentation
C) Ignore it if construction appears satisfactory
D) Document and evaluate the deviation through the appropriate project-control
process
Correct Answer: D) Document and evaluate the deviation through the appropriate
project-control process
Rationale: Material deviations from approved documents should be documented and
evaluated rather than informally accepted. The appropriate process may involve design
review, engineering judgment, agency approval, revised drawings, change documentation,
or other contract controls. Accurate records protect public safety, project quality, cost
control, and future maintenance activities.
9. Which condition generally produces the greatest increase in hydrostatic pressure
at a given point below a water surface?
A) Greater depth below the water surface
7006)
100 Original Practice Questions, Verified Answers & Rationales
Questions 1–25
1. Which soil property most directly describes the ratio of the volume of voids to the
total volume of a soil sample?
A) Porosity
B) Plasticity index
C) Specific gravity
D) Dry density
Correct Answer: A) Porosity
Rationale: Porosity is the ratio of void volume to total soil volume and is normally
expressed as a percentage. It differs from void ratio, which compares void volume with
solid-particle volume. Understanding these relationships is important when evaluating
groundwater movement, compaction, settlement, and other geotechnical conditions
encountered in civil engineering projects.
2. What is the primary purpose of soil compaction during earthwork construction?
A) Increase organic content
B) Reduce air voids and increase soil density
C) Increase groundwater flow
D) Eliminate all soil moisture
Correct Answer: B) Reduce air voids and increase soil density
Rationale: Compaction mechanically reduces air voids within soil, increasing dry density
and generally improving strength and stiffness. Proper compaction can also reduce
undesirable settlement and permeability. It does not mean removing all water from the soil,
,because some moisture is normally beneficial for achieving the specified compacted
condition.
3. A concrete cylinder test produces a compressive strength below the specified
design strength. Which action is most appropriate initially?
A) Immediately demolish the structure
B) Ignore the result
C) Investigate testing, sampling, curing, and concrete-placement records
D) Increase the concrete strength retroactively
Correct Answer: C) Investigate testing, sampling, curing, and concrete-placement
records
Rationale: A low test result should first be investigated systematically rather than
automatically assuming structural failure. Sampling, specimen preparation, curing, testing
procedures, concrete delivery records, and placement conditions can all affect results.
Engineering evaluation should determine whether additional testing or structural
assessment is warranted before selecting corrective action.
4. Which surveying instrument is commonly used to measure horizontal and vertical
angles electronically and can also measure distances when equipped with an
electronic distance-measuring system?
A) Level rod
B) Measuring tape
C) Plumb bob
D) Total station
Correct Answer: D) Total station
Rationale: A total station integrates electronic angle measurement with electronic distance
measurement and data collection. It is widely used for construction layout, topographic
surveys, control surveys, and as-built documentation. A level primarily establishes
elevations, while a plumb bob establishes vertical alignment and a tape provides direct
linear measurements.
,5. What is the primary engineering purpose of a stormwater detention facility?
A) Temporarily store runoff and control its release
B) Permanently eliminate precipitation
C) Increase peak runoff immediately
D) Convert stormwater into potable water
Correct Answer: A) Temporarily store runoff and control its release
Rationale: Detention facilities temporarily store stormwater and release it at a controlled
rate. This can reduce peak discharge and help manage downstream drainage capacity.
Detention differs from retention, where water is intended to remain stored or infiltrate.
Facility design must consider contributing drainage area, allowable discharge, storage
volume, outlet characteristics, and safety.
6. In reinforced concrete, what is the principal structural role of reinforcing steel in a
typical beam?
A) Resist only corrosion
B) Carry tensile stresses
C) Eliminate concrete shrinkage completely
D) Replace the need for concrete
Correct Answer: B) Carry tensile stresses
Rationale: Concrete is strong in compression but comparatively weak in tension.
Reinforcing steel is therefore strategically placed to resist tensile forces and work
compositely with the concrete. Reinforcement also contributes to crack control and
ductility. Its placement, development, spacing, cover, and anchorage must conform to the
applicable structural design requirements.
7. Which document normally provides the detailed written requirements governing
materials, workmanship, testing, and construction procedures?
, A) Site photograph
B) Daily weather report
C) Technical specification
D) Property tax record
Correct Answer: C) Technical specification
Rationale: Technical specifications establish written requirements for materials,
workmanship, testing, installation, quality, and related construction obligations. Drawings
communicate graphical information, while specifications provide complementary textual
requirements. Engineers and inspectors use both documents together when evaluating
whether construction conforms to the contract requirements.
8. A project engineer discovers that field construction differs materially from the
approved drawings. What should the engineer do first?
A) Conceal the difference
B) Authorize the change verbally without documentation
C) Ignore it if construction appears satisfactory
D) Document and evaluate the deviation through the appropriate project-control
process
Correct Answer: D) Document and evaluate the deviation through the appropriate
project-control process
Rationale: Material deviations from approved documents should be documented and
evaluated rather than informally accepted. The appropriate process may involve design
review, engineering judgment, agency approval, revised drawings, change documentation,
or other contract controls. Accurate records protect public safety, project quality, cost
control, and future maintenance activities.
9. Which condition generally produces the greatest increase in hydrostatic pressure
at a given point below a water surface?
A) Greater depth below the water surface
