Arkansas AR-EX 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 a trench protective
system?
A. Increase excavation production
B. Prevent water from entering the trench
C. Protect workers from cave-ins and related hazards
D. Reduce the amount of spoil removed
Answer: Protect workers from cave-ins and related
hazards
Rationale: A trench protective system is intended
primarily to protect workers from cave-ins, the principal
life-threatening hazard associated with trenching.
2. Which soil type generally has the greatest cohesion?
A. Gravel
B. Sand
C. Clay
D. Crushed stone
Answer: Clay
Rationale: Clay particles have cohesive properties that
can allow the soil to bind together, although actual
stability depends on moisture, fissuring, layering,
loading, and site conditions.
,3. What is the best first step before excavating near
existing underground utilities?
A. Begin excavation with a backhoe
B. Assume utilities are located at standard depths
C. Have underground utilities located and marked
D. Compact the surface
Answer: Have underground utilities located and marked
Rationale: Utility locating and marking help identify
underground hazards before excavation begins.
4. What does “spoils” refer to in excavation work?
A. Water removed from an excavation
B. Concrete removed from a structure
C. Excavated soil and other material removed from the
excavation
D. Imported aggregate
Answer: Excavated soil and other material removed
from the excavation
Rationale: Spoils are materials removed during
excavation and are commonly stockpiled, hauled away,
or reused if suitable.
5. Why should excavated material generally be kept
away from the edge of a trench?
A. To make the soil wetter
B. To increase trench width
C. To reduce surcharge loading and the possibility of
material falling into the trench
D. To improve equipment traction
Answer: To reduce surcharge loading and the possibility
of material falling into the trench
,Rationale: Spoil piles near the edge can add pressure to
the trench wall and create falling-material hazards.
6. What is benching?
A. Compacting soil in lifts
B. Installing a concrete footing
C. Forming horizontal levels or steps in the sides of an
excavation
D. Pumping water from a trench
Answer: Forming horizontal levels or steps in the sides
of an excavation
Rationale: Benching creates stepped excavation walls
and can be used as a protective method where
permitted by the applicable requirements and soil
conditions.
7. What is sloping an excavation?
A. Making the bottom perfectly level
B. Cutting the sides back at an appropriate angle
C. Installing vertical steel plates
D. Filling the excavation with gravel
Answer: Cutting the sides back at an appropriate angle
Rationale: Sloping reduces the likelihood of soil falling
or sliding into the excavation by reducing the steepness
of the excavation wall.
8. What is shoring?
A. Removing groundwater
B. Measuring excavation depth
C. Installing structural support to prevent movement of
excavation walls
D. Placing topsoil around a building
, Answer: Installing structural support to prevent
movement of excavation walls
Rationale: Shoring uses structural components to
support excavation walls and protect workers from
collapse.
9. What is a trench shield primarily designed to do?
A. Prevent groundwater infiltration
B. Support the entire surrounding property
C. Protect workers within the shield if a trench wall
collapses
D. Increase soil density
Answer: Protect workers within the shield if a trench
wall collapses
Rationale: A trench shield, commonly called a trench
box, protects workers by providing a protected zone
inside the excavation.
10. Which condition can significantly reduce soil
stability?
A. Dry weather alone
B. Painted stakes
C. Water saturation
D. Proper compaction
Answer: Water saturation
Rationale: Water can reduce soil strength, increase
pore-water pressure, and contribute to sloughing or
collapse.
11. What is the purpose of a dewatering system?
Contractor Practice Exam |
Questions, Verified Answers &
Detailed Rationales | Complete
Contractor License Exam Prep
Study Guide | Updated 2026
1. What is the primary purpose of a trench protective
system?
A. Increase excavation production
B. Prevent water from entering the trench
C. Protect workers from cave-ins and related hazards
D. Reduce the amount of spoil removed
Answer: Protect workers from cave-ins and related
hazards
Rationale: A trench protective system is intended
primarily to protect workers from cave-ins, the principal
life-threatening hazard associated with trenching.
2. Which soil type generally has the greatest cohesion?
A. Gravel
B. Sand
C. Clay
D. Crushed stone
Answer: Clay
Rationale: Clay particles have cohesive properties that
can allow the soil to bind together, although actual
stability depends on moisture, fissuring, layering,
loading, and site conditions.
,3. What is the best first step before excavating near
existing underground utilities?
A. Begin excavation with a backhoe
B. Assume utilities are located at standard depths
C. Have underground utilities located and marked
D. Compact the surface
Answer: Have underground utilities located and marked
Rationale: Utility locating and marking help identify
underground hazards before excavation begins.
4. What does “spoils” refer to in excavation work?
A. Water removed from an excavation
B. Concrete removed from a structure
C. Excavated soil and other material removed from the
excavation
D. Imported aggregate
Answer: Excavated soil and other material removed
from the excavation
Rationale: Spoils are materials removed during
excavation and are commonly stockpiled, hauled away,
or reused if suitable.
5. Why should excavated material generally be kept
away from the edge of a trench?
A. To make the soil wetter
B. To increase trench width
C. To reduce surcharge loading and the possibility of
material falling into the trench
D. To improve equipment traction
Answer: To reduce surcharge loading and the possibility
of material falling into the trench
,Rationale: Spoil piles near the edge can add pressure to
the trench wall and create falling-material hazards.
6. What is benching?
A. Compacting soil in lifts
B. Installing a concrete footing
C. Forming horizontal levels or steps in the sides of an
excavation
D. Pumping water from a trench
Answer: Forming horizontal levels or steps in the sides
of an excavation
Rationale: Benching creates stepped excavation walls
and can be used as a protective method where
permitted by the applicable requirements and soil
conditions.
7. What is sloping an excavation?
A. Making the bottom perfectly level
B. Cutting the sides back at an appropriate angle
C. Installing vertical steel plates
D. Filling the excavation with gravel
Answer: Cutting the sides back at an appropriate angle
Rationale: Sloping reduces the likelihood of soil falling
or sliding into the excavation by reducing the steepness
of the excavation wall.
8. What is shoring?
A. Removing groundwater
B. Measuring excavation depth
C. Installing structural support to prevent movement of
excavation walls
D. Placing topsoil around a building
, Answer: Installing structural support to prevent
movement of excavation walls
Rationale: Shoring uses structural components to
support excavation walls and protect workers from
collapse.
9. What is a trench shield primarily designed to do?
A. Prevent groundwater infiltration
B. Support the entire surrounding property
C. Protect workers within the shield if a trench wall
collapses
D. Increase soil density
Answer: Protect workers within the shield if a trench
wall collapses
Rationale: A trench shield, commonly called a trench
box, protects workers by providing a protected zone
inside the excavation.
10. Which condition can significantly reduce soil
stability?
A. Dry weather alone
B. Painted stakes
C. Water saturation
D. Proper compaction
Answer: Water saturation
Rationale: Water can reduce soil strength, increase
pore-water pressure, and contribute to sloughing or
collapse.
11. What is the purpose of a dewatering system?
