South Carolina Masonry Contractor
Examination Questions and Correct
Answers (Verified Answers) Plus Rationale
2027 Q&A| Instant Download Pdf
1. What is the primary purpose of mortar in masonry construction?
A. To increase the weight of the wall
B. To bond masonry units together and distribute loads
C. To eliminate the need for reinforcement
D. To waterproof the entire wall
Answer: B. To bond masonry units together and distribute loads
Rationale: Mortar bonds masonry units, accommodates minor
dimensional variations, and helps distribute compressive and other
forces between units. Mortar alone is not intended to replace structural
reinforcement or serve as the building's sole waterproofing system.
,2. Which mortar property is especially important for maintaining good
bond with masonry units?
A. Excessive hardness
B. High shrinkage
C. Workability
D. High water content
Answer: C. Workability
Rationale: Workable mortar spreads properly on the masonry unit and
permits the mason to achieve consistent joints and adequate contact.
Excessive water can weaken mortar, while excessive stiffness makes
proper placement and bonding difficult.
3. What is the most common type of unit used for concrete masonry
walls?
A. Structural steel block
B. Concrete masonry unit
C. Clay roofing tile
D. Gypsum block
Answer: B. Concrete masonry unit
,Rationale: Concrete masonry units, commonly called CMUs or concrete
blocks, are widely used for structural and nonstructural walls. They are
available in various sizes, shapes, densities, and configurations.
4. A standard concrete masonry unit is commonly referred to as
what?
A. CMU
B. CFS
C. PSL
D. LVL
Answer: A. CMU
Rationale: CMU stands for concrete masonry unit. The term generally
refers to factory-produced concrete block units used in walls, partitions,
foundations, and other masonry construction.
5. What is the primary function of a masonry control joint?
A. Increase wall thickness
B. Allow controlled movement and help minimize cracking
C. Replace reinforcing steel
D. Support floor joists
, Answer: B. Allow controlled movement and help minimize cracking
Rationale: Masonry walls can experience shrinkage, thermal movement,
and other dimensional changes. Properly located control joints help
accommodate movement and encourage cracking to occur at planned
locations rather than randomly.
6. Which tool is commonly used to check whether a masonry wall is
vertically aligned?
A. Chalk reel
B. Plumb bob
C. Tin snips
D. Pipe wrench
Answer: B. Plumb bob
Rationale: A plumb bob establishes a true vertical reference. A mason
may also use a level or other layout equipment, but the plumb bob is
specifically designed to establish vertical alignment.
7. What is the purpose of a mason's level?
Examination Questions and Correct
Answers (Verified Answers) Plus Rationale
2027 Q&A| Instant Download Pdf
1. What is the primary purpose of mortar in masonry construction?
A. To increase the weight of the wall
B. To bond masonry units together and distribute loads
C. To eliminate the need for reinforcement
D. To waterproof the entire wall
Answer: B. To bond masonry units together and distribute loads
Rationale: Mortar bonds masonry units, accommodates minor
dimensional variations, and helps distribute compressive and other
forces between units. Mortar alone is not intended to replace structural
reinforcement or serve as the building's sole waterproofing system.
,2. Which mortar property is especially important for maintaining good
bond with masonry units?
A. Excessive hardness
B. High shrinkage
C. Workability
D. High water content
Answer: C. Workability
Rationale: Workable mortar spreads properly on the masonry unit and
permits the mason to achieve consistent joints and adequate contact.
Excessive water can weaken mortar, while excessive stiffness makes
proper placement and bonding difficult.
3. What is the most common type of unit used for concrete masonry
walls?
A. Structural steel block
B. Concrete masonry unit
C. Clay roofing tile
D. Gypsum block
Answer: B. Concrete masonry unit
,Rationale: Concrete masonry units, commonly called CMUs or concrete
blocks, are widely used for structural and nonstructural walls. They are
available in various sizes, shapes, densities, and configurations.
4. A standard concrete masonry unit is commonly referred to as
what?
A. CMU
B. CFS
C. PSL
D. LVL
Answer: A. CMU
Rationale: CMU stands for concrete masonry unit. The term generally
refers to factory-produced concrete block units used in walls, partitions,
foundations, and other masonry construction.
5. What is the primary function of a masonry control joint?
A. Increase wall thickness
B. Allow controlled movement and help minimize cracking
C. Replace reinforcing steel
D. Support floor joists
, Answer: B. Allow controlled movement and help minimize cracking
Rationale: Masonry walls can experience shrinkage, thermal movement,
and other dimensional changes. Properly located control joints help
accommodate movement and encourage cracking to occur at planned
locations rather than randomly.
6. Which tool is commonly used to check whether a masonry wall is
vertically aligned?
A. Chalk reel
B. Plumb bob
C. Tin snips
D. Pipe wrench
Answer: B. Plumb bob
Rationale: A plumb bob establishes a true vertical reference. A mason
may also use a level or other layout equipment, but the plumb bob is
specifically designed to establish vertical alignment.
7. What is the purpose of a mason's level?
