AR RD Road Construction Contractor
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
What is the primary purpose of a subgrade in road construction?
A. To provide a decorative base
B. To support the pavement structure
C. To reduce traffic noise
D. To act as a drainage layer
B. To support the pavement structure
Rationale: The subgrade is the natural soil prepared to support the loads
transmitted by the pavement layers above.
1. Which type of soil is most suitable for subgrade in road construction?
A. Clay with high plasticity
B. Sandy gravel with good compaction properties
C. Peat soil
D. Organic soil
B. Sandy gravel with good compaction properties
Rationale: Sandy gravel provides high strength, good drainage, and
compacts well, making it ideal for subgrade support.
2. What is the minimum thickness recommended for a flexible pavement
base course?
A. 50 mm
B. 100 mm
C. 150 mm
D. 200 mm
C. 150 mm
Rationale: Base courses provide structural strength and distribute
, loads; 150 mm is a commonly recommended minimum thickness for
flexible pavements.
3. Which of the following is a key factor in determining the pavement
design?
A. Road color
B. Traffic load and volume
C. Roadside vegetation
D. Pavement contractor preference
B. Traffic load and volume
Rationale: Pavement thickness and material selection are primarily
determined by anticipated traffic load and volume to ensure
durability.
4. The primary function of a binder course in asphalt pavement is to:
A. Provide surface texture
B. Act as a waterproofing layer
C. Bind the base course and surface course
D. Reduce construction costs
C. Bind the base course and surface course
Rationale: The binder course provides intermediate strength and
binds the base course to the wearing surface.
5. What is the purpose of a prime coat in flexible pavement?
A. To seal the surface of the subgrade
B. To provide a temporary road surface
C. To promote adhesion of the base to the binder
D. To act as a final wearing course
C. To promote adhesion of the base to the binder
Rationale: Prime coats improve bonding between the base layer and
the asphalt binder, reducing slippage.
6. In road construction, what does the term “camber” refer to?
A. The thickness of asphalt
B. The cross slope of the road
C. The material used for embankment
D. The design speed of the road
B. The cross slope of the road
Rationale: Camber ensures proper drainage by giving the road
surface a slight slope toward the sides.
, 7. Which equipment is commonly used for compacting asphalt layers?
A. Motor grader
B. Vibratory roller
C. Excavator
D. Concrete paver
B. Vibratory roller
Rationale: Vibratory rollers compact asphalt layers effectively to
remove air voids and achieve required density.
8. What is the purpose of a geotextile in road construction?
A. Decorative purposes
B. Drainage, separation, and reinforcement
C. Reducing asphalt costs
D. Acting as a pavement binder
B. Drainage, separation, and reinforcement
Rationale: Geotextiles are used to improve soil stability, prevent
mixing of layers, and facilitate drainage.
9. Which factor is critical when selecting aggregate for asphalt concrete?
A. Color of aggregate
B. Gradation and durability
C. Proximity to construction site
D. Vendor brand
B. Gradation and durability
Rationale: Proper gradation ensures a dense, stable asphalt mix, and
durability ensures long service life.
10. The term “CBR” in road construction stands for:
A. Coarse Bitumen Ratio
B. California Bearing Ratio
C. Compacted Base Requirement
D. Concrete Bonding Ratio
B. California Bearing Ratio
Rationale: CBR measures the strength of subgrade and base
materials relative to a standard crushed rock material.
11. Which type of pavement is preferred for heavy traffic roads?
A. Gravel road
B. Flexible asphalt pavement
C. Rigid concrete pavement
D. Earthen road
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
What is the primary purpose of a subgrade in road construction?
A. To provide a decorative base
B. To support the pavement structure
C. To reduce traffic noise
D. To act as a drainage layer
B. To support the pavement structure
Rationale: The subgrade is the natural soil prepared to support the loads
transmitted by the pavement layers above.
1. Which type of soil is most suitable for subgrade in road construction?
A. Clay with high plasticity
B. Sandy gravel with good compaction properties
C. Peat soil
D. Organic soil
B. Sandy gravel with good compaction properties
Rationale: Sandy gravel provides high strength, good drainage, and
compacts well, making it ideal for subgrade support.
2. What is the minimum thickness recommended for a flexible pavement
base course?
A. 50 mm
B. 100 mm
C. 150 mm
D. 200 mm
C. 150 mm
Rationale: Base courses provide structural strength and distribute
, loads; 150 mm is a commonly recommended minimum thickness for
flexible pavements.
3. Which of the following is a key factor in determining the pavement
design?
A. Road color
B. Traffic load and volume
C. Roadside vegetation
D. Pavement contractor preference
B. Traffic load and volume
Rationale: Pavement thickness and material selection are primarily
determined by anticipated traffic load and volume to ensure
durability.
4. The primary function of a binder course in asphalt pavement is to:
A. Provide surface texture
B. Act as a waterproofing layer
C. Bind the base course and surface course
D. Reduce construction costs
C. Bind the base course and surface course
Rationale: The binder course provides intermediate strength and
binds the base course to the wearing surface.
5. What is the purpose of a prime coat in flexible pavement?
A. To seal the surface of the subgrade
B. To provide a temporary road surface
C. To promote adhesion of the base to the binder
D. To act as a final wearing course
C. To promote adhesion of the base to the binder
Rationale: Prime coats improve bonding between the base layer and
the asphalt binder, reducing slippage.
6. In road construction, what does the term “camber” refer to?
A. The thickness of asphalt
B. The cross slope of the road
C. The material used for embankment
D. The design speed of the road
B. The cross slope of the road
Rationale: Camber ensures proper drainage by giving the road
surface a slight slope toward the sides.
, 7. Which equipment is commonly used for compacting asphalt layers?
A. Motor grader
B. Vibratory roller
C. Excavator
D. Concrete paver
B. Vibratory roller
Rationale: Vibratory rollers compact asphalt layers effectively to
remove air voids and achieve required density.
8. What is the purpose of a geotextile in road construction?
A. Decorative purposes
B. Drainage, separation, and reinforcement
C. Reducing asphalt costs
D. Acting as a pavement binder
B. Drainage, separation, and reinforcement
Rationale: Geotextiles are used to improve soil stability, prevent
mixing of layers, and facilitate drainage.
9. Which factor is critical when selecting aggregate for asphalt concrete?
A. Color of aggregate
B. Gradation and durability
C. Proximity to construction site
D. Vendor brand
B. Gradation and durability
Rationale: Proper gradation ensures a dense, stable asphalt mix, and
durability ensures long service life.
10. The term “CBR” in road construction stands for:
A. Coarse Bitumen Ratio
B. California Bearing Ratio
C. Compacted Base Requirement
D. Concrete Bonding Ratio
B. California Bearing Ratio
Rationale: CBR measures the strength of subgrade and base
materials relative to a standard crushed rock material.
11. Which type of pavement is preferred for heavy traffic roads?
A. Gravel road
B. Flexible asphalt pavement
C. Rigid concrete pavement
D. Earthen road
