AR HW Highway Contractor Exam
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary purpose of highway subgrade preparation?
A. Provide vegetation control
B. Control surface water
C. Ensure a stable foundation for pavement
D. Reduce asphalt oxidation
C. Ensure a stable foundation for pavement
A strong, properly compacted subgrade provides uniform support and
prevents settlement of the pavement structure.
2. Which soil type generally has the poorest load-bearing capacity for
highway construction?
A. Sand
B. Gravel
C. Silt
D. Clay
Clay retains water and compresses easily, reducing its ability to support
heavy loads.
3. The ideal moisture content for maximum soil compaction is known as
the:
A. Optimum density point
B. Water saturation point
,C. Optimum moisture content
D. Compaction index
The optimum moisture content allows soil particles to pack more tightly,
achieving maximum density.
4. What instrument is commonly used to measure elevations in highway
construction?
A. Transit compass
B. Automatic level
C. Laser tape
D. Clinometer
An automatic level provides precise elevation readings for grading and
alignment work.
5. What is the typical percentage of air voids required in hot-mix asphalt
(HMA)?
A. 1–2%
B. 3–4%
C. 10–12%
D. 4–8%
Air voids within this range ensure durability by balancing compaction with
flexibility.
6. Which material is used as a binder in asphalt concrete?
A. Portland cement
B. Bitumen
C. Fly ash
D. Lime
Bitumen acts as the adhesive binder that holds aggregate together in
asphalt concrete.
7. The primary purpose of aggregate gradation in asphalt mix design is
to:
A. Increase asphalt cost
B. Improve surface texture only
, C. Achieve stability and durability
D. Reduce weight
Proper gradation creates interlocking particles, providing strength and
long-term performance.
8. What type of base course is most commonly used in highway
construction?
A. Soil-cement
B. Fly ash-treated
C. Crushed stone
D. Sand
Crushed stone base provides excellent load distribution and compaction
properties.
9. A crown in roadway design serves to:
A. Improve traction
B. Reduce vehicle speed
C. Facilitate surface drainage
D. Increase lane width
A crown directs water toward the shoulders, preventing ponding and
pavement damage.
10. What is the main purpose of a tack coat?
A. Seal cracks
B. Increase friction
C. Promote bonding between asphalt layers
D. Reduce layer thickness
Tack coat enhances adhesion between asphalt lifts to prevent slippage and
delamination.
11. Which test measures asphalt binder viscosity?
A. CBR test
B. Proctor test
C. Brookfield rotational viscometer test
D. Nuclear density test
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary purpose of highway subgrade preparation?
A. Provide vegetation control
B. Control surface water
C. Ensure a stable foundation for pavement
D. Reduce asphalt oxidation
C. Ensure a stable foundation for pavement
A strong, properly compacted subgrade provides uniform support and
prevents settlement of the pavement structure.
2. Which soil type generally has the poorest load-bearing capacity for
highway construction?
A. Sand
B. Gravel
C. Silt
D. Clay
Clay retains water and compresses easily, reducing its ability to support
heavy loads.
3. The ideal moisture content for maximum soil compaction is known as
the:
A. Optimum density point
B. Water saturation point
,C. Optimum moisture content
D. Compaction index
The optimum moisture content allows soil particles to pack more tightly,
achieving maximum density.
4. What instrument is commonly used to measure elevations in highway
construction?
A. Transit compass
B. Automatic level
C. Laser tape
D. Clinometer
An automatic level provides precise elevation readings for grading and
alignment work.
5. What is the typical percentage of air voids required in hot-mix asphalt
(HMA)?
A. 1–2%
B. 3–4%
C. 10–12%
D. 4–8%
Air voids within this range ensure durability by balancing compaction with
flexibility.
6. Which material is used as a binder in asphalt concrete?
A. Portland cement
B. Bitumen
C. Fly ash
D. Lime
Bitumen acts as the adhesive binder that holds aggregate together in
asphalt concrete.
7. The primary purpose of aggregate gradation in asphalt mix design is
to:
A. Increase asphalt cost
B. Improve surface texture only
, C. Achieve stability and durability
D. Reduce weight
Proper gradation creates interlocking particles, providing strength and
long-term performance.
8. What type of base course is most commonly used in highway
construction?
A. Soil-cement
B. Fly ash-treated
C. Crushed stone
D. Sand
Crushed stone base provides excellent load distribution and compaction
properties.
9. A crown in roadway design serves to:
A. Improve traction
B. Reduce vehicle speed
C. Facilitate surface drainage
D. Increase lane width
A crown directs water toward the shoulders, preventing ponding and
pavement damage.
10. What is the main purpose of a tack coat?
A. Seal cracks
B. Increase friction
C. Promote bonding between asphalt layers
D. Reduce layer thickness
Tack coat enhances adhesion between asphalt lifts to prevent slippage and
delamination.
11. Which test measures asphalt binder viscosity?
A. CBR test
B. Proctor test
C. Brookfield rotational viscometer test
D. Nuclear density test
