AZ A-11 Road Construction
Contractor Exam Questions And
Correct Answers (Verified Answers) Plus
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1. Which type of soil is most suitable for road subgrade construction?
A. Clay
B. Peat
C. Sandy gravel
D. Organic soil
C. Sandy gravel
Rationale: Sandy gravel has good load-bearing capacity and drainage
properties, making it ideal for road subgrades.
2. What is the primary purpose of a road’s sub-base layer?
A. Provide a smooth riding surface
B. Drain water and distribute loads
C. Bind asphalt layers together
D. Act as a decorative layer
B. Drain water and distribute loads
Rationale: The sub-base layer ensures proper drainage and spreads
traffic loads to prevent subgrade failure.
3. What is the standard slope recommended for road shoulders?
A. 1:1
B. 1:2
C. 1:3
D. 1:4
C. 1:3
, Rationale: A slope of 1:3 ensures stability and safe water runoff
without causing erosion.
4. Which material is most commonly used for flexible pavement surfaces?
A. Concrete
B. Asphalt
C. Gravel
D. Brick
B. Asphalt
Rationale: Asphalt is flexible, smooth, and widely used for road
surfaces in flexible pavements.
5. In road construction, what is the purpose of geotextiles?
A. Provide aesthetic finish
B. Reinforce soil and prevent mixing of layers
C. Increase subgrade slope
D. Replace the need for sub-base
B. Reinforce soil and prevent mixing of layers
Rationale: Geotextiles separate different soil layers and add strength
to prevent structural failure.
6. What type of drainage system is used to prevent water accumulation
beneath the road surface?
A. Surface drainage only
B. Subsurface drainage
C. Sidewalk drainage
D. Overhead drainage
B. Subsurface drainage
Rationale: Subsurface drainage removes water trapped in the
pavement structure, preventing weakening of layers.
7. The CBR (California Bearing Ratio) test measures:
A. Soil permeability
B. Soil bearing strength
C. Asphalt thickness
D. Concrete durability
B. Soil bearing strength
Rationale: CBR indicates the strength of subgrade soil to support
road loads.
8. Which of the following is a characteristic of rigid pavement?
A. High flexibility
, B. Concrete slab construction
C. Asphalt overlay
D. Easily deformable
B. Concrete slab construction
Rationale: Rigid pavements use concrete slabs to distribute loads over
a wide area, offering durability.
9. When designing a road curve, the superelevation is:
A. The slope of the subgrade
B. The transverse slope to counteract centrifugal force
C. The longitudinal slope of the road
D. The thickness of the pavement
B. The transverse slope to counteract centrifugal force
Rationale: Superelevation tilts the road surface to allow vehicles to
safely negotiate curves.
10. Which equipment is typically used for earth compaction in road
works?
A. Grader
B. Roller
C. Excavator
D. Loader
B. Roller
Rationale: Rollers compact soil and sub-base layers to achieve
required density.
11. The optimum moisture content for soil compaction is determined
using which test?
A. Proctor test
B. CBR test
C. Atterberg limits test
D. Sieve analysis
A. Proctor test
Rationale: The Proctor test establishes the moisture content at which
soil achieves maximum compaction.
12. In flexible pavement, the wearing course is:
A. The subgrade layer
B. The top asphalt layer
C. The base layer
D. The drainage layer
Contractor Exam Questions And
Correct Answers (Verified Answers) Plus
Rationale2026 Q&A| Instant Download
1. Which type of soil is most suitable for road subgrade construction?
A. Clay
B. Peat
C. Sandy gravel
D. Organic soil
C. Sandy gravel
Rationale: Sandy gravel has good load-bearing capacity and drainage
properties, making it ideal for road subgrades.
2. What is the primary purpose of a road’s sub-base layer?
A. Provide a smooth riding surface
B. Drain water and distribute loads
C. Bind asphalt layers together
D. Act as a decorative layer
B. Drain water and distribute loads
Rationale: The sub-base layer ensures proper drainage and spreads
traffic loads to prevent subgrade failure.
3. What is the standard slope recommended for road shoulders?
A. 1:1
B. 1:2
C. 1:3
D. 1:4
C. 1:3
, Rationale: A slope of 1:3 ensures stability and safe water runoff
without causing erosion.
4. Which material is most commonly used for flexible pavement surfaces?
A. Concrete
B. Asphalt
C. Gravel
D. Brick
B. Asphalt
Rationale: Asphalt is flexible, smooth, and widely used for road
surfaces in flexible pavements.
5. In road construction, what is the purpose of geotextiles?
A. Provide aesthetic finish
B. Reinforce soil and prevent mixing of layers
C. Increase subgrade slope
D. Replace the need for sub-base
B. Reinforce soil and prevent mixing of layers
Rationale: Geotextiles separate different soil layers and add strength
to prevent structural failure.
6. What type of drainage system is used to prevent water accumulation
beneath the road surface?
A. Surface drainage only
B. Subsurface drainage
C. Sidewalk drainage
D. Overhead drainage
B. Subsurface drainage
Rationale: Subsurface drainage removes water trapped in the
pavement structure, preventing weakening of layers.
7. The CBR (California Bearing Ratio) test measures:
A. Soil permeability
B. Soil bearing strength
C. Asphalt thickness
D. Concrete durability
B. Soil bearing strength
Rationale: CBR indicates the strength of subgrade soil to support
road loads.
8. Which of the following is a characteristic of rigid pavement?
A. High flexibility
, B. Concrete slab construction
C. Asphalt overlay
D. Easily deformable
B. Concrete slab construction
Rationale: Rigid pavements use concrete slabs to distribute loads over
a wide area, offering durability.
9. When designing a road curve, the superelevation is:
A. The slope of the subgrade
B. The transverse slope to counteract centrifugal force
C. The longitudinal slope of the road
D. The thickness of the pavement
B. The transverse slope to counteract centrifugal force
Rationale: Superelevation tilts the road surface to allow vehicles to
safely negotiate curves.
10. Which equipment is typically used for earth compaction in road
works?
A. Grader
B. Roller
C. Excavator
D. Loader
B. Roller
Rationale: Rollers compact soil and sub-base layers to achieve
required density.
11. The optimum moisture content for soil compaction is determined
using which test?
A. Proctor test
B. CBR test
C. Atterberg limits test
D. Sieve analysis
A. Proctor test
Rationale: The Proctor test establishes the moisture content at which
soil achieves maximum compaction.
12. In flexible pavement, the wearing course is:
A. The subgrade layer
B. The top asphalt layer
C. The base layer
D. The drainage layer
