NYC Cement Mason Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which of the following best describes the primary function of Portland
cement in concrete mixtures used in masonry construction?
A. To act as a decorative surface binder only
B. To chemically react with water to form a hardened binding matrix
C. To reduce the need for aggregates in structural applications
D. To prevent evaporation of water during curing
Correct Answer: B
Rationale: Portland cement undergoes hydration when mixed with water,
forming calcium silicate hydrate, which binds aggregates together and
provides strength and durability to hardened concrete used in masonry
work.
2. In cement masonry work, what is the primary purpose of properly
grading aggregates before mixing concrete?
A. To increase the color uniformity of finished surfaces
B. To reduce the need for curing time
C. To ensure optimal particle distribution for strength and workability
D. To eliminate the need for cement in the mix
,Correct Answer: C
Rationale: Proper grading of aggregates ensures a well-graded particle
distribution, reducing voids and improving both the strength and
workability of concrete mixtures.
3. Which condition most commonly leads to plastic shrinkage cracking in
freshly placed concrete?
A. Excessively low cement content
B. Rapid surface evaporation due to wind, heat, or low humidity
C. Overuse of coarse aggregates
D. Excessive curing time
Correct Answer: B
Rationale: Plastic shrinkage cracks occur when moisture evaporates from
the concrete surface faster than bleed water can replace it, typically under
hot, dry, or windy conditions.
4. What is the primary purpose of a control joint in concrete slabs?
A. To increase compressive strength of the slab
B. To allow for planned cracking due to shrinkage and thermal movement
C. To increase surface hardness of concrete
D. To accelerate curing time in large pours
Correct Answer: B
Rationale: Control joints are intentionally placed weak points that guide
cracking caused by shrinkage and temperature changes, preventing
random and uncontrolled cracking patterns.
5. Which test is most commonly used on job sites to determine the
workability of fresh concrete?
A. Compressive strength cylinder test
B. Slump test
,C. Core sampling test
D. Ultrasonic pulse velocity test
Correct Answer: B
Rationale: The slump test measures the consistency and workability of
fresh concrete by observing how much it subsides when a cone-shaped
mold is removed.
6. What is the effect of adding excessive water to a concrete mix?
A. Increases long-term durability
B. Improves compressive strength
C. Reduces strength and increases porosity
D. Eliminates the need for curing
Correct Answer: C
Rationale: Excess water increases the water-cement ratio, leading to
higher porosity after hydration, which reduces overall strength and
durability.
7. Which tool is primarily used to level and strike off excess concrete
during placement?
A. Trowel
B. Float
C. Screed board
D. Mason’s hammer
Correct Answer: C
Rationale: A screed board is used to level freshly placed concrete by
striking off excess material to achieve a uniform surface elevation.
8. What is the primary purpose of curing concrete after placement?
A. To increase evaporation rate of water
B. To allow chemical hydration to continue for strength gain
, C. To reduce cement content in the slab
D. To immediately harden the surface for traffic
Correct Answer: B
Rationale: Curing maintains adequate moisture and temperature
conditions to allow hydration reactions to continue, ensuring proper
strength development.
9. Which of the following best describes air-entrained concrete?
A. Concrete with reduced cement content
B. Concrete containing intentionally introduced microscopic air bubbles
C. Concrete with no coarse aggregate
D. Concrete that cures without water
Correct Answer: B
Rationale: Air-entrained concrete contains small, uniformly distributed air
bubbles that improve freeze-thaw resistance and durability in harsh
weather conditions.
10. What is the primary purpose of reinforcement steel (rebar) in
concrete masonry structures?
A. To increase the color uniformity of concrete
B. To resist tensile stresses that concrete alone cannot handle
C. To reduce the weight of concrete structures
D. To speed up curing time
Correct Answer: B
Rationale: Reinforcing steel is embedded in concrete to provide tensile
strength, as concrete is strong in compression but weak in tension.
11. Which factor most significantly affects the compressive strength
of concrete?
Questions And Correct Answers
(Verified Answers) Plus Rationale 2026
Q&A| Instant Download Pdf
1. Which of the following best describes the primary function of Portland
cement in concrete mixtures used in masonry construction?
A. To act as a decorative surface binder only
B. To chemically react with water to form a hardened binding matrix
C. To reduce the need for aggregates in structural applications
D. To prevent evaporation of water during curing
Correct Answer: B
Rationale: Portland cement undergoes hydration when mixed with water,
forming calcium silicate hydrate, which binds aggregates together and
provides strength and durability to hardened concrete used in masonry
work.
2. In cement masonry work, what is the primary purpose of properly
grading aggregates before mixing concrete?
A. To increase the color uniformity of finished surfaces
B. To reduce the need for curing time
C. To ensure optimal particle distribution for strength and workability
D. To eliminate the need for cement in the mix
,Correct Answer: C
Rationale: Proper grading of aggregates ensures a well-graded particle
distribution, reducing voids and improving both the strength and
workability of concrete mixtures.
3. Which condition most commonly leads to plastic shrinkage cracking in
freshly placed concrete?
A. Excessively low cement content
B. Rapid surface evaporation due to wind, heat, or low humidity
C. Overuse of coarse aggregates
D. Excessive curing time
Correct Answer: B
Rationale: Plastic shrinkage cracks occur when moisture evaporates from
the concrete surface faster than bleed water can replace it, typically under
hot, dry, or windy conditions.
4. What is the primary purpose of a control joint in concrete slabs?
A. To increase compressive strength of the slab
B. To allow for planned cracking due to shrinkage and thermal movement
C. To increase surface hardness of concrete
D. To accelerate curing time in large pours
Correct Answer: B
Rationale: Control joints are intentionally placed weak points that guide
cracking caused by shrinkage and temperature changes, preventing
random and uncontrolled cracking patterns.
5. Which test is most commonly used on job sites to determine the
workability of fresh concrete?
A. Compressive strength cylinder test
B. Slump test
,C. Core sampling test
D. Ultrasonic pulse velocity test
Correct Answer: B
Rationale: The slump test measures the consistency and workability of
fresh concrete by observing how much it subsides when a cone-shaped
mold is removed.
6. What is the effect of adding excessive water to a concrete mix?
A. Increases long-term durability
B. Improves compressive strength
C. Reduces strength and increases porosity
D. Eliminates the need for curing
Correct Answer: C
Rationale: Excess water increases the water-cement ratio, leading to
higher porosity after hydration, which reduces overall strength and
durability.
7. Which tool is primarily used to level and strike off excess concrete
during placement?
A. Trowel
B. Float
C. Screed board
D. Mason’s hammer
Correct Answer: C
Rationale: A screed board is used to level freshly placed concrete by
striking off excess material to achieve a uniform surface elevation.
8. What is the primary purpose of curing concrete after placement?
A. To increase evaporation rate of water
B. To allow chemical hydration to continue for strength gain
, C. To reduce cement content in the slab
D. To immediately harden the surface for traffic
Correct Answer: B
Rationale: Curing maintains adequate moisture and temperature
conditions to allow hydration reactions to continue, ensuring proper
strength development.
9. Which of the following best describes air-entrained concrete?
A. Concrete with reduced cement content
B. Concrete containing intentionally introduced microscopic air bubbles
C. Concrete with no coarse aggregate
D. Concrete that cures without water
Correct Answer: B
Rationale: Air-entrained concrete contains small, uniformly distributed air
bubbles that improve freeze-thaw resistance and durability in harsh
weather conditions.
10. What is the primary purpose of reinforcement steel (rebar) in
concrete masonry structures?
A. To increase the color uniformity of concrete
B. To resist tensile stresses that concrete alone cannot handle
C. To reduce the weight of concrete structures
D. To speed up curing time
Correct Answer: B
Rationale: Reinforcing steel is embedded in concrete to provide tensile
strength, as concrete is strong in compression but weak in tension.
11. Which factor most significantly affects the compressive strength
of concrete?
