AR RD Road Construction Contractor
Exam Practice Questions And Correct
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Rationales 2027 Q&A | Instant
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Q1. What is the primary purpose of a road subgrade?
A. To provide the final riding surface
B. To support the pavement structure
C. To provide surface drainage only
D. To replace the aggregate base
Answer: B. To support the pavement structure
Rationale: The subgrade is the prepared soil foundation beneath the
pavement system. Its strength, uniformity, drainage characteristics, and
compaction directly affect pavement performance.
,Q2. Which test is commonly used to evaluate the bearing strength of a
compacted soil or pavement subgrade?
A. Slump test
B. CBR test
C. Air entrainment test
D. Tensile test
Answer: B. CBR test
Rationale: The California Bearing Ratio (CBR) test evaluates the resistance
of soil or aggregate to penetration and is commonly used to assess
subgrade and base-course strength.
Q3. What is the primary purpose of compacting roadway soil?
A. Increase its moisture content
B. Reduce density
C. Increase strength and reduce settlement
D. Eliminate all drainage
Answer: C. Increase strength and reduce settlement
Rationale: Proper compaction increases soil density, improves load-bearing
capacity, reduces compressibility, and minimizes future settlement.
,Q4. What condition generally produces the best compaction of a cohesive
soil?
A. Completely dry soil
B. Soil near its optimum moisture content
C. Soil saturated with standing water
D. Soil containing no fines
Answer: B. Soil near its optimum moisture content
Rationale: Most soils achieve maximum dry density at or near their
optimum moisture content, as determined by an appropriate laboratory
compaction test.
Q5. Which piece of equipment is commonly used to compact asphalt
pavement?
A. Vibratory or steel-wheel roller
B. Backhoe only
C. Concrete pump
D. Water truck only
Answer: A. Vibratory or steel-wheel roller
, Rationale: Rollers are designed to compact asphalt while it is within the
appropriate temperature range and to achieve the specified density and
surface characteristics.
Q6. What is the purpose of an aggregate base course?
A. To provide structural support beneath the pavement
B. To serve as pavement markings
C. To eliminate the need for drainage
D. To soften the subgrade
Answer: A. To provide structural support beneath the pavement
Rationale: A properly graded and compacted aggregate base distributes
traffic loads and provides a stable foundation for asphalt or concrete
pavement.
Q7. What is the main function of roadway crown?
A. Direct water toward the pavement edges
B. Increase traffic speed
C. Prevent all vehicle turning
D. Increase pavement thickness at the edges
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationales 2027 Q&A | Instant
Download Pdf
Q1. What is the primary purpose of a road subgrade?
A. To provide the final riding surface
B. To support the pavement structure
C. To provide surface drainage only
D. To replace the aggregate base
Answer: B. To support the pavement structure
Rationale: The subgrade is the prepared soil foundation beneath the
pavement system. Its strength, uniformity, drainage characteristics, and
compaction directly affect pavement performance.
,Q2. Which test is commonly used to evaluate the bearing strength of a
compacted soil or pavement subgrade?
A. Slump test
B. CBR test
C. Air entrainment test
D. Tensile test
Answer: B. CBR test
Rationale: The California Bearing Ratio (CBR) test evaluates the resistance
of soil or aggregate to penetration and is commonly used to assess
subgrade and base-course strength.
Q3. What is the primary purpose of compacting roadway soil?
A. Increase its moisture content
B. Reduce density
C. Increase strength and reduce settlement
D. Eliminate all drainage
Answer: C. Increase strength and reduce settlement
Rationale: Proper compaction increases soil density, improves load-bearing
capacity, reduces compressibility, and minimizes future settlement.
,Q4. What condition generally produces the best compaction of a cohesive
soil?
A. Completely dry soil
B. Soil near its optimum moisture content
C. Soil saturated with standing water
D. Soil containing no fines
Answer: B. Soil near its optimum moisture content
Rationale: Most soils achieve maximum dry density at or near their
optimum moisture content, as determined by an appropriate laboratory
compaction test.
Q5. Which piece of equipment is commonly used to compact asphalt
pavement?
A. Vibratory or steel-wheel roller
B. Backhoe only
C. Concrete pump
D. Water truck only
Answer: A. Vibratory or steel-wheel roller
, Rationale: Rollers are designed to compact asphalt while it is within the
appropriate temperature range and to achieve the specified density and
surface characteristics.
Q6. What is the purpose of an aggregate base course?
A. To provide structural support beneath the pavement
B. To serve as pavement markings
C. To eliminate the need for drainage
D. To soften the subgrade
Answer: A. To provide structural support beneath the pavement
Rationale: A properly graded and compacted aggregate base distributes
traffic loads and provides a stable foundation for asphalt or concrete
pavement.
Q7. What is the main function of roadway crown?
A. Direct water toward the pavement edges
B. Increase traffic speed
C. Prevent all vehicle turning
D. Increase pavement thickness at the edges
