AR MC MASONRY CONTRACTOR EXAM
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the minimum thickness of a standard concrete masonry unit
(CMU) wall for a non-load-bearing wall?
A) 4 inches
B) 6 inches
C) 8 inches
D) 10 inches
Rationale: Non-load-bearing CMU walls typically have a minimum
thickness of 8 inches to provide adequate stability and support.
2. Which type of mortar is most suitable for masonry exposed to severe
weathering?
A) Type O
B) Type N
C) Type S
D) Type M
Rationale: Type S mortar has higher compressive strength and is
suitable for exterior walls exposed to harsh weather.
3. What is the primary purpose of a bond beam in masonry construction?
A) Decorative finish
B) Moisture barrier
C) Structural reinforcement
D) Insulation
Rationale: Bond beams are horizontal reinforced masonry units used
to strengthen walls and distribute loads.
,4. In concrete masonry construction, control joints are provided to:
A) Improve aesthetics
B) Increase thermal insulation
C) Control cracking due to shrinkage and temperature changes
D) Reduce construction costs
Rationale: Control joints allow masonry to crack in predetermined
locations and prevent random cracking.
5. Which of the following is a common type of reinforcement used in
CMU walls?
A) Steel plates
B) Aluminum sheets
C) Rebar
D) Copper wire
Rationale: Rebar is commonly used to reinforce CMU walls for
tensile and lateral strength.
6. The term "grout" in masonry refers to:
A) Fine sand used for finishing
B) A fluid mixture of cement, sand, and water used to fill cores of
masonry units
C) Protective coating
D) Insulation material
Rationale: Grout fills hollow cores of CMUs or spaces between
masonry units to strengthen the wall.
7. What is the typical spacing of vertical reinforcement in a standard
reinforced CMU wall?
A) 8 inches
B) 16 inches
C) 24 inches
D) 36 inches
Rationale: Vertical reinforcement is often placed in every other cell
or spaced at 24 inches for typical walls.
8. Which masonry unit is best suited for fire-resistance applications?
A) Wood block
B) Concrete masonry unit (CMU)
C) Glass block
D) Clay tile
, Rationale: CMUs are non-combustible and provide excellent fire-
resistance compared to other materials.
9. What is the minimum compressive strength of concrete used in load-
bearing CMU walls?
A) 500 psi
B) 1000 psi
C) 1500 psi
D) 1900 psi
Rationale: Load-bearing CMU walls typically require concrete with a
minimum compressive strength of 1900 psi (13 MPa).
10. When constructing a masonry wall on uneven footing, what is the
recommended method?
A) Use mortar to level each course
B) Step the footing to match the wall courses
C) Fill voids with sand
D) Adjust block sizes randomly
Rationale: Stepping the footing ensures that the wall courses remain
level and structurally sound.
11. Efflorescence on masonry walls is caused by:
A) Excessive cement in mortar
B) Water-soluble salts migrating to the surface
C) Poor reinforcement placement
D) Low-strength mortar
Rationale: Efflorescence appears as a white powdery deposit from
salts carried by water through masonry.
12. The typical ratio for Type N mortar mix is:
A) 1:1 cement:sand
B) 1:2 cement:sand
C) 1:1:6 cement:lime:sand
D) 1:3 cement:sand
Rationale: Type N mortar uses 1 part cement, 1 part lime, and 6 parts
sand, suitable for general-purpose masonry.
13. In masonry construction, "weep holes" are provided to:
A) Improve insulation
B) Allow moisture to escape from walls
C) Reinforce the wall
D) Ventilate the attic
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the minimum thickness of a standard concrete masonry unit
(CMU) wall for a non-load-bearing wall?
A) 4 inches
B) 6 inches
C) 8 inches
D) 10 inches
Rationale: Non-load-bearing CMU walls typically have a minimum
thickness of 8 inches to provide adequate stability and support.
2. Which type of mortar is most suitable for masonry exposed to severe
weathering?
A) Type O
B) Type N
C) Type S
D) Type M
Rationale: Type S mortar has higher compressive strength and is
suitable for exterior walls exposed to harsh weather.
3. What is the primary purpose of a bond beam in masonry construction?
A) Decorative finish
B) Moisture barrier
C) Structural reinforcement
D) Insulation
Rationale: Bond beams are horizontal reinforced masonry units used
to strengthen walls and distribute loads.
,4. In concrete masonry construction, control joints are provided to:
A) Improve aesthetics
B) Increase thermal insulation
C) Control cracking due to shrinkage and temperature changes
D) Reduce construction costs
Rationale: Control joints allow masonry to crack in predetermined
locations and prevent random cracking.
5. Which of the following is a common type of reinforcement used in
CMU walls?
A) Steel plates
B) Aluminum sheets
C) Rebar
D) Copper wire
Rationale: Rebar is commonly used to reinforce CMU walls for
tensile and lateral strength.
6. The term "grout" in masonry refers to:
A) Fine sand used for finishing
B) A fluid mixture of cement, sand, and water used to fill cores of
masonry units
C) Protective coating
D) Insulation material
Rationale: Grout fills hollow cores of CMUs or spaces between
masonry units to strengthen the wall.
7. What is the typical spacing of vertical reinforcement in a standard
reinforced CMU wall?
A) 8 inches
B) 16 inches
C) 24 inches
D) 36 inches
Rationale: Vertical reinforcement is often placed in every other cell
or spaced at 24 inches for typical walls.
8. Which masonry unit is best suited for fire-resistance applications?
A) Wood block
B) Concrete masonry unit (CMU)
C) Glass block
D) Clay tile
, Rationale: CMUs are non-combustible and provide excellent fire-
resistance compared to other materials.
9. What is the minimum compressive strength of concrete used in load-
bearing CMU walls?
A) 500 psi
B) 1000 psi
C) 1500 psi
D) 1900 psi
Rationale: Load-bearing CMU walls typically require concrete with a
minimum compressive strength of 1900 psi (13 MPa).
10. When constructing a masonry wall on uneven footing, what is the
recommended method?
A) Use mortar to level each course
B) Step the footing to match the wall courses
C) Fill voids with sand
D) Adjust block sizes randomly
Rationale: Stepping the footing ensures that the wall courses remain
level and structurally sound.
11. Efflorescence on masonry walls is caused by:
A) Excessive cement in mortar
B) Water-soluble salts migrating to the surface
C) Poor reinforcement placement
D) Low-strength mortar
Rationale: Efflorescence appears as a white powdery deposit from
salts carried by water through masonry.
12. The typical ratio for Type N mortar mix is:
A) 1:1 cement:sand
B) 1:2 cement:sand
C) 1:1:6 cement:lime:sand
D) 1:3 cement:sand
Rationale: Type N mortar uses 1 part cement, 1 part lime, and 6 parts
sand, suitable for general-purpose masonry.
13. In masonry construction, "weep holes" are provided to:
A) Improve insulation
B) Allow moisture to escape from walls
C) Reinforce the wall
D) Ventilate the attic
