1. Which agency regulates contractor licensing for street and highway
construction in Arizona?
A. ADOT
B. OSHA
C. Arizona ROC
D. EPA
Answer: C. Arizona ROC
Explanation: The Arizona Registrar of Contractors (ROC) oversees contractor
licensing, including street and highway construction contractors.
2. What is the primary function of the Arizona Department of Transportation
(ADOT)?
A. Issue contractor licenses
B. Enforce labor laws
C. Manage highway planning, design, and construction
D. Oversee utility billing
Answer: C. Manage highway planning, design, and construction
Explanation: ADOT is responsible for the design, construction, and
maintenance of Arizona’s highways and streets.
3. What is the minimum compaction percentage usually required for subgrade
soil in Arizona highway projects?
A. 85%
B. 90%
C. 95%
D. 100%
Answer: C. 95%
Explanation: Arizona DOT specifications typically require subgrade soil to be
compacted to at least 95% of maximum dry density (per Proctor test).
,4. Which test is most commonly used to determine soil compaction levels?
A. Atterberg Limits Test
B. Standard Proctor Test
C. Slump Test
D. Permeability Test
Answer: B. Standard Proctor Test
Explanation: The Standard Proctor Test determines the maximum dry density
and optimum moisture content for soil compaction.
5. The crown of a roadway is designed to:
A. Increase asphalt thickness
B. Direct water runoff toward the shoulders
C. Reduce pavement cracking
D. Increase vehicle traction
Answer: B. Direct water runoff toward the shoulders
Explanation: A crown is a slight slope in the road surface that helps drain
water away, preventing pooling and pavement damage.
6. What is the primary purpose of aggregate base course in road construction?
A. Provide aesthetics
B. Distribute loads and provide stability
C. Reduce asphalt costs
D. Improve visibility
Answer: B. Distribute loads and provide stability
Explanation: Aggregate base distributes traffic loads and provides structural
support for asphalt or concrete pavement.
7. Which type of asphalt mix is most commonly used in Arizona highways?
A. Hot Mix Asphalt (HMA)
B. Cold Patch Asphalt
C. Tar-bound Macadam
D. Cutback Asphalt
Answer: A. Hot Mix Asphalt (HMA)
Explanation: HMA is durable, weather-resistant, and commonly specified by
ADOT for highway pavements.
,8. The slump test measures:
A. Soil compaction
B. Asphalt density
C. Concrete workability
D. Aggregate gradation
Answer: C. Concrete workability
Explanation: The slump test checks the consistency and workability of fresh
concrete before placement.
9. Which OSHA standard governs trenching and excavation safety?
A. 29 CFR 1910
B. 29 CFR 1926 Subpart P
C. 29 CFR 1915
D. 29 CFR 1930
Answer: B. 29 CFR 1926 Subpart P
Explanation: OSHA’s Subpart P provides safety requirements for trenching
and excavation work.
10. When installing stormwater drainage culverts, what slope is generally
required for flow efficiency?
A. 0% (level)
B. Slight positive slope
C. Negative slope
D. Vertical drop
Answer: B. Slight positive slope
Explanation: A positive slope ensures water flows properly through culverts,
preventing ponding.
11. In Arizona, a contractor must renew their ROC license every:
A. 1 year
B. 2 years
C. 3 years
D. 5 years
Answer: B. 2 years
Explanation: Arizona contractor licenses must be renewed biennially with the
ROC.
, 12. What is the minimum trench depth at which OSHA requires protective
systems (sloping, shoring, shielding)?
A. 3 feet
B. 4 feet
C. 5 feet
D. 10 feet
Answer: C. 5 feet
Explanation: OSHA requires protective systems for trenches deeper than 5 feet
unless stable rock is present.
13. Which survey method is most commonly used to set horizontal alignment in
highway construction?
A. Triangulation
B. GPS and total station
C. Compass survey
D. Hydrographic survey
Answer: B. GPS and total station
Explanation: GPS and total stations are used for accurate alignment and
staking in highway projects.
14. Which material property is most critical for asphalt binder performance in
Arizona’s hot climate?
A. Viscosity
B. Tensile strength
C. Elastic modulus
D. Thermal conductivity
Answer: A. Viscosity
Explanation: Binder viscosity affects rutting resistance and flexibility in
extreme heat.
15. What is the main purpose of prime coat in asphalt paving?
A. Waterproof the surface
B. Bond base to asphalt layer
C. Increase skid resistance
D. Reduce curing time
Answer: B. Bond base to asphalt layer
construction in Arizona?
A. ADOT
B. OSHA
C. Arizona ROC
D. EPA
Answer: C. Arizona ROC
Explanation: The Arizona Registrar of Contractors (ROC) oversees contractor
licensing, including street and highway construction contractors.
2. What is the primary function of the Arizona Department of Transportation
(ADOT)?
A. Issue contractor licenses
B. Enforce labor laws
C. Manage highway planning, design, and construction
D. Oversee utility billing
Answer: C. Manage highway planning, design, and construction
Explanation: ADOT is responsible for the design, construction, and
maintenance of Arizona’s highways and streets.
3. What is the minimum compaction percentage usually required for subgrade
soil in Arizona highway projects?
A. 85%
B. 90%
C. 95%
D. 100%
Answer: C. 95%
Explanation: Arizona DOT specifications typically require subgrade soil to be
compacted to at least 95% of maximum dry density (per Proctor test).
,4. Which test is most commonly used to determine soil compaction levels?
A. Atterberg Limits Test
B. Standard Proctor Test
C. Slump Test
D. Permeability Test
Answer: B. Standard Proctor Test
Explanation: The Standard Proctor Test determines the maximum dry density
and optimum moisture content for soil compaction.
5. The crown of a roadway is designed to:
A. Increase asphalt thickness
B. Direct water runoff toward the shoulders
C. Reduce pavement cracking
D. Increase vehicle traction
Answer: B. Direct water runoff toward the shoulders
Explanation: A crown is a slight slope in the road surface that helps drain
water away, preventing pooling and pavement damage.
6. What is the primary purpose of aggregate base course in road construction?
A. Provide aesthetics
B. Distribute loads and provide stability
C. Reduce asphalt costs
D. Improve visibility
Answer: B. Distribute loads and provide stability
Explanation: Aggregate base distributes traffic loads and provides structural
support for asphalt or concrete pavement.
7. Which type of asphalt mix is most commonly used in Arizona highways?
A. Hot Mix Asphalt (HMA)
B. Cold Patch Asphalt
C. Tar-bound Macadam
D. Cutback Asphalt
Answer: A. Hot Mix Asphalt (HMA)
Explanation: HMA is durable, weather-resistant, and commonly specified by
ADOT for highway pavements.
,8. The slump test measures:
A. Soil compaction
B. Asphalt density
C. Concrete workability
D. Aggregate gradation
Answer: C. Concrete workability
Explanation: The slump test checks the consistency and workability of fresh
concrete before placement.
9. Which OSHA standard governs trenching and excavation safety?
A. 29 CFR 1910
B. 29 CFR 1926 Subpart P
C. 29 CFR 1915
D. 29 CFR 1930
Answer: B. 29 CFR 1926 Subpart P
Explanation: OSHA’s Subpart P provides safety requirements for trenching
and excavation work.
10. When installing stormwater drainage culverts, what slope is generally
required for flow efficiency?
A. 0% (level)
B. Slight positive slope
C. Negative slope
D. Vertical drop
Answer: B. Slight positive slope
Explanation: A positive slope ensures water flows properly through culverts,
preventing ponding.
11. In Arizona, a contractor must renew their ROC license every:
A. 1 year
B. 2 years
C. 3 years
D. 5 years
Answer: B. 2 years
Explanation: Arizona contractor licenses must be renewed biennially with the
ROC.
, 12. What is the minimum trench depth at which OSHA requires protective
systems (sloping, shoring, shielding)?
A. 3 feet
B. 4 feet
C. 5 feet
D. 10 feet
Answer: C. 5 feet
Explanation: OSHA requires protective systems for trenches deeper than 5 feet
unless stable rock is present.
13. Which survey method is most commonly used to set horizontal alignment in
highway construction?
A. Triangulation
B. GPS and total station
C. Compass survey
D. Hydrographic survey
Answer: B. GPS and total station
Explanation: GPS and total stations are used for accurate alignment and
staking in highway projects.
14. Which material property is most critical for asphalt binder performance in
Arizona’s hot climate?
A. Viscosity
B. Tensile strength
C. Elastic modulus
D. Thermal conductivity
Answer: A. Viscosity
Explanation: Binder viscosity affects rutting resistance and flexibility in
extreme heat.
15. What is the main purpose of prime coat in asphalt paving?
A. Waterproof the surface
B. Bond base to asphalt layer
C. Increase skid resistance
D. Reduce curing time
Answer: B. Bond base to asphalt layer
