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Rationales 2026 Q&A | instant Download pdf
1. What is the primary purpose of mortar in masonry construction?
A. Increase wall weight
B. Bond masonry units together
C. Replace reinforcement steel
D. Speed up curing time
Answer: B
Mortar’s main function is to bond masonry units, distribute loads
evenly, and seal joints against moisture and air infiltration.
2. Which type of cement is most commonly used in masonry mortar?
A. Type I Portland cement
B. Type V cement
C. Quick-setting cement
D. Asphalt cement
,Answer: A
Type I Portland cement is the standard general-purpose cement used in
most masonry mortar mixes.
3. What tool is used to check if a wall is vertically straight?
A. Trowel
B. Level
C. Chalk line
D. Joiner
Answer: B
A level ensures masonry walls are plumb (vertical) and level (horizontal).
4. What is the term for horizontal mortar joints?
A. Bed joints
B. Head joints
C. Collar joints
D. Control joints
Answer: A
Bed joints are horizontal mortar layers between masonry units.
,5. What is the standard unit of measurement for masonry layout in
most U.S. construction?
A. Millimeters
B. Feet and inches
C. Meters
D. Yards only
Answer: B
Feet and inches are standard in U.S. masonry layout and construction.
6. What is the purpose of a control joint in masonry?
A. Add decoration
B. Prevent cracking from movement
C. Increase wall strength
D. Hold insulation
Answer: B
Control joints allow controlled cracking due to thermal expansion and
shrinkage.
, 7. Which masonry unit is most commonly used in structural walls?
A. Glass block
B. Brick
C. Concrete block (CMU)
D. Stone veneer
Answer: C
Concrete masonry units (CMUs) are widely used for structural load-
bearing walls.
8. What is the typical curing time for mortar to gain initial strength?
A. 1 hour
B. 24–48 hours
C. 1 week
D. 1 month
Answer: B
Mortar typically gains initial strength within 24–48 hours under normal
conditions.
9. What does “bond pattern” refer to in masonry?