AL MA Masonry Contractor Exam
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a bond in masonry construction?
A) Increase aesthetic appeal
B) Improve structural stability
C) Reduce material costs
D) Facilitate faster construction
Bonding in masonry ensures that bricks or blocks interlock properly,
increasing the wall’s structural strength.
2. Which type of mortar is best suited for load-bearing walls?
A) Type N
B) Type M
C) Type S
D) Type O
Type M mortar has the highest compressive strength, making it ideal
for load-bearing walls.
3. What is the minimum allowable compressive strength for a standard
concrete masonry unit (CMU)?
A) 500 psi
B) 1000 psi
C) 1500 psi
D) 1900 psi
Most building codes require CMUs to have at least 1900 psi
compressive strength for structural use.
4. The vertical alignment of bricks in a wall is called:
A) Bond
, B) Plumb
C) Level
D) Course
“Plumb” refers to a wall being perfectly vertical, which is critical for
structural integrity.
5. What is the typical thickness of a single wythe concrete block wall?
A) 4 inches
B) 8 inches
C) 10 inches
D) 12 inches
Standard concrete masonry units are usually 8 inches thick, which is
one wythe.
6. Which type of joint provides the best weather resistance?
A) Flush joint
B) Raked joint
C) Concave joint
D) V-joint
Concave joints are compressed, forming a dense surface that sheds
water effectively.
7. What is efflorescence in masonry?
A) Cracks along mortar joints
B) White crystalline deposit on the surface
C) Bulging of walls
D) Rust stains from reinforcement
Efflorescence occurs when soluble salts migrate to the surface and
crystallize.
8. When constructing a reinforced masonry wall, what material is placed
in the cores before filling with grout?
A) Sand
B) Steel reinforcement
C) Asphalt
D) Plastic spacers
Steel reinforcement is placed in cores to increase tensile strength and
prevent cracking.
9. What is the primary function of control joints in masonry?
A) Add aesthetic appeal
B) Support roofing structures
, C) Control cracking due to shrinkage or thermal movement
D) Increase wall thickness
Control joints allow walls to expand and contract, preventing random
cracking.
10. Which type of brick has the highest density and strength?
A) Fly ash brick
B) Clay brick
C) Sand-lime brick
D) Concrete brick
High-density clay bricks have superior compressive strength and
durability.
11. In masonry construction, a “header” brick is placed:
A) Along the wall’s length
B) With the end facing the wall face
C) Diagonally in corners
D) Only in non-load-bearing walls
Headers tie two wythes together, strengthening multi-wythe walls.
12. What is the proper water-to-cement ratio for most masonry
mortar?
A) 0.25
B) 0.30
C) 0.5–0.6
D) 0.8–1.0
A ratio of 0.5–0.6 provides workable mortar while maintaining
strength.
13. Which tool is commonly used to check the level of a masonry
wall?
A) Square
B) Trowel
C) Spirit level
D) Plumb bob
A spirit level ensures horizontal surfaces are level and walls are even.
14. What is the minimum cover for reinforcing steel in an exterior
concrete masonry wall exposed to weather?
A) 1 inch
B) 1.5 inches
C) 2 inches
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a bond in masonry construction?
A) Increase aesthetic appeal
B) Improve structural stability
C) Reduce material costs
D) Facilitate faster construction
Bonding in masonry ensures that bricks or blocks interlock properly,
increasing the wall’s structural strength.
2. Which type of mortar is best suited for load-bearing walls?
A) Type N
B) Type M
C) Type S
D) Type O
Type M mortar has the highest compressive strength, making it ideal
for load-bearing walls.
3. What is the minimum allowable compressive strength for a standard
concrete masonry unit (CMU)?
A) 500 psi
B) 1000 psi
C) 1500 psi
D) 1900 psi
Most building codes require CMUs to have at least 1900 psi
compressive strength for structural use.
4. The vertical alignment of bricks in a wall is called:
A) Bond
, B) Plumb
C) Level
D) Course
“Plumb” refers to a wall being perfectly vertical, which is critical for
structural integrity.
5. What is the typical thickness of a single wythe concrete block wall?
A) 4 inches
B) 8 inches
C) 10 inches
D) 12 inches
Standard concrete masonry units are usually 8 inches thick, which is
one wythe.
6. Which type of joint provides the best weather resistance?
A) Flush joint
B) Raked joint
C) Concave joint
D) V-joint
Concave joints are compressed, forming a dense surface that sheds
water effectively.
7. What is efflorescence in masonry?
A) Cracks along mortar joints
B) White crystalline deposit on the surface
C) Bulging of walls
D) Rust stains from reinforcement
Efflorescence occurs when soluble salts migrate to the surface and
crystallize.
8. When constructing a reinforced masonry wall, what material is placed
in the cores before filling with grout?
A) Sand
B) Steel reinforcement
C) Asphalt
D) Plastic spacers
Steel reinforcement is placed in cores to increase tensile strength and
prevent cracking.
9. What is the primary function of control joints in masonry?
A) Add aesthetic appeal
B) Support roofing structures
, C) Control cracking due to shrinkage or thermal movement
D) Increase wall thickness
Control joints allow walls to expand and contract, preventing random
cracking.
10. Which type of brick has the highest density and strength?
A) Fly ash brick
B) Clay brick
C) Sand-lime brick
D) Concrete brick
High-density clay bricks have superior compressive strength and
durability.
11. In masonry construction, a “header” brick is placed:
A) Along the wall’s length
B) With the end facing the wall face
C) Diagonally in corners
D) Only in non-load-bearing walls
Headers tie two wythes together, strengthening multi-wythe walls.
12. What is the proper water-to-cement ratio for most masonry
mortar?
A) 0.25
B) 0.30
C) 0.5–0.6
D) 0.8–1.0
A ratio of 0.5–0.6 provides workable mortar while maintaining
strength.
13. Which tool is commonly used to check the level of a masonry
wall?
A) Square
B) Trowel
C) Spirit level
D) Plumb bob
A spirit level ensures horizontal surfaces are level and walls are even.
14. What is the minimum cover for reinforcing steel in an exterior
concrete masonry wall exposed to weather?
A) 1 inch
B) 1.5 inches
C) 2 inches
