Exam Practice Questions And Correct

Road Construction Inspector Certification Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

Q1. What is the primary responsibility of a road construction inspector?

• Design roadway plans
• Approve contractor payments
• Operate construction equipment
• Ensure construction work complies with plans, specifications, and

standards

Rationale: Inspectors verify compliance; they do not design or operate

equipment.

Q2. Which soil type generally has the highest compaction difficulty?

• Gravel
• Sand 1 / 4

• Silt
• Clay

Rationale: Clay holds moisture and compacts poorly without proper

conditioning.

Q3. The Proctor test is used to determine which property of soil?

• Plasticity index
• Shear strength
• Optimum moisture content and maximum dry density
• Liquid limit

Rationale: The Proctor test identifies OMC and MDD for compaction

control.

Q4. What is the typical moisture content range allowed for compaction relative to optimum?

A. ±10%

B. ±8%

C. ±5%

D. ±2%

Rationale: Most specifications require moisture within approximately 2%

of OMC.

• / 4

Q5. A proof roll is used primarily to identify:

• Asphalt density
• Soft or unstable areas in subgrade
• Aggregate gradation
• Concrete slump

Rationale: Proof rolling reveals weak or pumping subgrade locations.

Q6. What instrument is commonly used to measure elevation differences on a roadway?

• Tape measure
• Smart level
• Automatic level (Dumpy level)
• Laser thermometer

Rationale: Automatic levels provide accurate elevation readings for grade

checks.

Q7. The purpose of a tack coat in asphalt paving is to:

• Increase asphalt stiffness
• Prevent moisture intrusion
• Promote bonding between pavement layers
• Increase skid resistance

Rationale: Tack coat ensures proper adhesion between asphalt layers. 3 / 4

Q8. What is the primary role of aggregate base in road construction?

• Provide skid resistance
• Distribute loads to subgrade
• Seal cracks
• Control drainage only

Rationale: Base layers transfer traffic loads to the subgrade.

Q9. What is the minimum slump typically required for standard roadway concrete?

• 0–1 inch
• 6–8 inches
• 2–4 inches
• 8–10 inches

Rationale: Roadway concrete generally uses a medium slump for

workability and strength.

Q10. Which test is used to determine asphalt binder grade?

• L.A. abrasion test
• Proctor test
• Performance grade (PG) testing
• Slump test
• / 4