Arkansas AR-ER Earthwork
Contractor Practice Exam |
Questions, Verified Answers &
Detailed Rationales | Complete
Contractor License Exam Prep
Study Guide | Updated 2026
1. What is the primary purpose of site grading on an
earthwork project?
A. To increase the soil’s organic content
B. To eliminate all excavation
C. To establish the required elevations, slopes, and
drainage patterns
D. To reduce the project boundary
Answer: To establish the required elevations, slopes,
and drainage patterns
Rationale: Proper grading establishes design elevations
and slopes while directing water according to the plans
and specifications.
2. What does the term “benching” generally mean in
earthwork?
A. Placing concrete footings
B. Creating horizontal steps in a slope or excavation
C. Compacting asphalt
D. Installing underground utilities
Answer: Creating horizontal steps in a slope or
excavation
,Rationale: Benching creates stepped surfaces that can
improve slope stability and provide working areas,
depending on the excavation design.
3. Which soil property most directly affects how easily
soil can be compacted?
A. Color
B. Organic odor
C. Moisture content
D. Rock color
Answer: Moisture content
Rationale: Soil generally compacts most effectively
when its moisture content is near its optimum moisture
content.
4. What is the purpose of a moisture-density test?
A. To determine the soil’s color
B. To determine pipe size
C. To establish the relationship between moisture
content and dry density
D. To measure rainfall
Answer: To establish the relationship between moisture
content and dry density
Rationale: A moisture-density test, such as a Proctor
test, identifies maximum dry density and optimum
moisture content for a soil.
5. What is maximum dry density?
A. The weight of wet soil before excavation
B. The maximum weight of water in soil
C. The greatest dry density obtainable under a specified
,compactive effort
D. The density of solid rock
Answer: The greatest dry density obtainable under a
specified compactive effort
Rationale: Maximum dry density is the reference density
used to establish field compaction requirements.
6. What is optimum moisture content?
A. The moisture content at which soil becomes saturated
B. The moisture content at which a specified compactive
effort produces maximum dry density
C. The amount of rainfall expected during construction
D. The amount of water in groundwater
Answer: The moisture content at which a specified
compactive effort produces maximum dry density
Rationale: Soil normally reaches its highest dry density
at a particular moisture level for a given compaction
effort.
7. Which piece of equipment is commonly used for mass
excavation?
A. Plate compactor
B. Hand tamper
C. Excavator
D. Concrete saw
Answer: Excavator
Rationale: Excavators are designed for digging, loading,
trenching, and general excavation operations.
8. What is the primary function of a bulldozer blade?
, A. Pump groundwater
B. Test soil density
C. Push, spread, and rough-grade soil or other materials
D. Install reinforcement steel
Answer: Push, spread, and rough-grade soil or other
materials
Rationale: Bulldozers are especially effective for
pushing material, clearing, spreading, and rough
grading.
9. What equipment is commonly used for fine grading?
A. Crane
B. Motor grader
C. Water truck only
D. Drill press
Answer: Motor grader
Rationale: Motor graders provide precise control of
grades, slopes, crowns, and finished surfaces.
10. Why is a water truck commonly used during
earthwork?
A. To transport concrete
B. To remove survey stakes
C. To control moisture and dust
D. To compact rock by vibration
Answer: To control moisture and dust
Rationale: Water trucks are frequently used to maintain
suitable soil moisture for compaction and suppress
airborne dust.
11. What is over-excavation?
Contractor Practice Exam |
Questions, Verified Answers &
Detailed Rationales | Complete
Contractor License Exam Prep
Study Guide | Updated 2026
1. What is the primary purpose of site grading on an
earthwork project?
A. To increase the soil’s organic content
B. To eliminate all excavation
C. To establish the required elevations, slopes, and
drainage patterns
D. To reduce the project boundary
Answer: To establish the required elevations, slopes,
and drainage patterns
Rationale: Proper grading establishes design elevations
and slopes while directing water according to the plans
and specifications.
2. What does the term “benching” generally mean in
earthwork?
A. Placing concrete footings
B. Creating horizontal steps in a slope or excavation
C. Compacting asphalt
D. Installing underground utilities
Answer: Creating horizontal steps in a slope or
excavation
,Rationale: Benching creates stepped surfaces that can
improve slope stability and provide working areas,
depending on the excavation design.
3. Which soil property most directly affects how easily
soil can be compacted?
A. Color
B. Organic odor
C. Moisture content
D. Rock color
Answer: Moisture content
Rationale: Soil generally compacts most effectively
when its moisture content is near its optimum moisture
content.
4. What is the purpose of a moisture-density test?
A. To determine the soil’s color
B. To determine pipe size
C. To establish the relationship between moisture
content and dry density
D. To measure rainfall
Answer: To establish the relationship between moisture
content and dry density
Rationale: A moisture-density test, such as a Proctor
test, identifies maximum dry density and optimum
moisture content for a soil.
5. What is maximum dry density?
A. The weight of wet soil before excavation
B. The maximum weight of water in soil
C. The greatest dry density obtainable under a specified
,compactive effort
D. The density of solid rock
Answer: The greatest dry density obtainable under a
specified compactive effort
Rationale: Maximum dry density is the reference density
used to establish field compaction requirements.
6. What is optimum moisture content?
A. The moisture content at which soil becomes saturated
B. The moisture content at which a specified compactive
effort produces maximum dry density
C. The amount of rainfall expected during construction
D. The amount of water in groundwater
Answer: The moisture content at which a specified
compactive effort produces maximum dry density
Rationale: Soil normally reaches its highest dry density
at a particular moisture level for a given compaction
effort.
7. Which piece of equipment is commonly used for mass
excavation?
A. Plate compactor
B. Hand tamper
C. Excavator
D. Concrete saw
Answer: Excavator
Rationale: Excavators are designed for digging, loading,
trenching, and general excavation operations.
8. What is the primary function of a bulldozer blade?
, A. Pump groundwater
B. Test soil density
C. Push, spread, and rough-grade soil or other materials
D. Install reinforcement steel
Answer: Push, spread, and rough-grade soil or other
materials
Rationale: Bulldozers are especially effective for
pushing material, clearing, spreading, and rough
grading.
9. What equipment is commonly used for fine grading?
A. Crane
B. Motor grader
C. Water truck only
D. Drill press
Answer: Motor grader
Rationale: Motor graders provide precise control of
grades, slopes, crowns, and finished surfaces.
10. Why is a water truck commonly used during
earthwork?
A. To transport concrete
B. To remove survey stakes
C. To control moisture and dust
D. To compact rock by vibration
Answer: To control moisture and dust
Rationale: Water trucks are frequently used to maintain
suitable soil moisture for compaction and suppress
airborne dust.
11. What is over-excavation?
