A. OSHA 29 CFR 1910 - License Exam Practice Exam 100 Questions And Co...

North Carolina Highway Contractor License Exam Practice Exam 100 Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• The primary reference manual for NC Highway Contractor Exam

questions is:

A. OSHA 29 CFR 1910

• NCDOT Standard Specifications for Roads and Structures

C. ACI 318

• EPA Water Quality Handbook

Rationale: The exam is based heavily on NCDOT specifications and

standards.

• Asphalt compaction should generally be completed before the mix

cools below:

A. 300°F 1 / 3

B. 175°F

C. 125°F

D. 200°F

Rationale: Below 175°F asphalt becomes too rigid for proper

compaction.

3. The subgrade for a highway project must be tested for:

• Alkali-silica reaction
• Traffic marking compatibility
• Density and moisture content
• Concrete slump

Rationale: Stable density and moisture ensure proper load-bearing

capacity.

4. The purpose of a tack coat between asphalt layers is to:

• Waterproof the pavement
• Bond layers together
• Strengthen subgrade
• Reduce temperature

Rationale: Tack coat creates adhesion between asphalt lifts.

5. A Type III barricade is used primarily for:

• Minor lane shifts
• Pedestrian safety only
• Horizontal alignment warnings
• Road closures 2 / 3

Rationale: Type III barricades indicate full roadway closure or

blockage.

6. Concrete curing is important to prevent:

• Asphalt rutting
• Premature cracking and low strength
• Reflective cracking
• Aggregate segregation

Rationale: Proper curing maintains moisture needed for hydration

and strength gain.

• Which organization sets work zone traffic control standards?

A. FHWA

B. MUTCD

C. AASHTO

D. NIOSH

Rationale: MUTCD governs signs, barricades, and traffic control

methods.

8. In slope stabilization, riprap is primarily used to prevent:

• Subgrade expansion
• Asphalt bleeding
• Erosion from water flow
• Concrete scaling

Rationale: Riprap protects slopes from scour and erosion.

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