CO Prefabricated Structures
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationale2026 Q&A| Instant
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1. What is the primary purpose of using prefabricated structural
components in building construction?
A. To eliminate the need for structural engineers
B. To reduce on-site construction time and improve quality control
C. To increase on-site labor requirements
D. To make the building design process more flexible
Answer: B
Rationale: Prefabrication allows manufacturing components off-site
under controlled conditions, reducing construction time on site and
improving consistency and quality.
2. Which of the following materials is most commonly used for
prefabricated structural panels in residential construction?
A. Solid hardwood
B. Steel frames with plywood sheathing
C. Reinforced concrete cast in place
D. Straw bale panels
Answer: B
Rationale: Steel-framed panels sheathed with plywood or oriented
strand board (OSB) are widely used due to strength, light weight, and
ease of transport.
3. In structural engineering, the term “dead load” refers to:
A. Loads caused by occupants and furniture
, B. Loads from wind or seismic activity
C. The weight of the structural components themselves
D. Loads from snow accumulation
Answer: C
Rationale: Dead load is the self-weight of the structure and
permanent fixtures.
4. Which building code would most likely govern prefabricated structures
in Kenya?
A. International Building Code (IBC)
B. Eurocode only
C. National building regulations or codes adopted by local authorities
D. No building code applies
Answer: C
Rationale: Local building regulations, as adopted by Kenyan
authorities, govern design, safety, and construction practices.
5. When transporting large prefabricated panels, which factor is most
critical to avoid structural damage?
A. Painting the panels before transport
B. Ensuring panels are adequately braced and supported during transit
C. Scheduling transport at night
D. Using cardboard wrapping only
Answer: B
Rationale: Proper bracing and support prevent bending, cracking or
distortion during transport.
6. Which of the following is a major advantage of modular construction
for multi-storey buildings?
A. Increased cost due to duplication of finishing materials
B. Extended construction duration
C. Improved consistency and faster onsite assembly
D. Difficulty in designing services like plumbing and electrical
Answer: C
Rationale: Modular units built under controlled conditions ensure
consistent quality and reduce assembly time on site.
7. What is the purpose of a bill of quantities (BOQ) in prefabricated
contracting?
A. To schedule workers
B. To estimate material quantities and cost for procurement and
, budgeting
C. To design the structural layout
D. To certify completion
Answer: B
Rationale: A BOQ lists all materials, components and quantities
needed for cost estimation and procurement control.
8. In quality control of prefabricated concrete modules, which test is
commonly performed to check strength?
A. Soil compaction test
B. Slump test or cube/cylinder compression test
C. Sound insulation test
D. Thermal conductivity test
Answer: B
Rationale: Compressive strength tests (e.g., concrete cubes or
cylinders) verify concrete meets design strength.
9. For a contractor, which insurance is most relevant before starting
assembling prefabricated structures on site?
A. Life insurance for workers
B. Public liability insurance and contractor’s all-risks insurance
C. Automobile insurance
D. Travel insurance
Answer: B
Rationale: Public liability protects against damage or injury during
onsite work; contractor’s all-risks covers materials and workmanship.
10. Which of the following is a key health and safety concern during
lifting and hoisting of prefabricated elements?
A. Painting the elements before lifting
B. Overloading the crane beyond capacity
C. Using manual labor instead of mechanical lifting
D. Wearing reflective vests
Answer: B
Rationale: Overloading can lead to crane failure, dropped loads —
posing serious safety hazard.
11. What is the main advantage of using light-gauge steel framing
over traditional timber framing in prefabrication?
A. Better sound absorption
B. Non-combustibility and resistance to pests
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationale2026 Q&A| Instant
Download Pdf
1. What is the primary purpose of using prefabricated structural
components in building construction?
A. To eliminate the need for structural engineers
B. To reduce on-site construction time and improve quality control
C. To increase on-site labor requirements
D. To make the building design process more flexible
Answer: B
Rationale: Prefabrication allows manufacturing components off-site
under controlled conditions, reducing construction time on site and
improving consistency and quality.
2. Which of the following materials is most commonly used for
prefabricated structural panels in residential construction?
A. Solid hardwood
B. Steel frames with plywood sheathing
C. Reinforced concrete cast in place
D. Straw bale panels
Answer: B
Rationale: Steel-framed panels sheathed with plywood or oriented
strand board (OSB) are widely used due to strength, light weight, and
ease of transport.
3. In structural engineering, the term “dead load” refers to:
A. Loads caused by occupants and furniture
, B. Loads from wind or seismic activity
C. The weight of the structural components themselves
D. Loads from snow accumulation
Answer: C
Rationale: Dead load is the self-weight of the structure and
permanent fixtures.
4. Which building code would most likely govern prefabricated structures
in Kenya?
A. International Building Code (IBC)
B. Eurocode only
C. National building regulations or codes adopted by local authorities
D. No building code applies
Answer: C
Rationale: Local building regulations, as adopted by Kenyan
authorities, govern design, safety, and construction practices.
5. When transporting large prefabricated panels, which factor is most
critical to avoid structural damage?
A. Painting the panels before transport
B. Ensuring panels are adequately braced and supported during transit
C. Scheduling transport at night
D. Using cardboard wrapping only
Answer: B
Rationale: Proper bracing and support prevent bending, cracking or
distortion during transport.
6. Which of the following is a major advantage of modular construction
for multi-storey buildings?
A. Increased cost due to duplication of finishing materials
B. Extended construction duration
C. Improved consistency and faster onsite assembly
D. Difficulty in designing services like plumbing and electrical
Answer: C
Rationale: Modular units built under controlled conditions ensure
consistent quality and reduce assembly time on site.
7. What is the purpose of a bill of quantities (BOQ) in prefabricated
contracting?
A. To schedule workers
B. To estimate material quantities and cost for procurement and
, budgeting
C. To design the structural layout
D. To certify completion
Answer: B
Rationale: A BOQ lists all materials, components and quantities
needed for cost estimation and procurement control.
8. In quality control of prefabricated concrete modules, which test is
commonly performed to check strength?
A. Soil compaction test
B. Slump test or cube/cylinder compression test
C. Sound insulation test
D. Thermal conductivity test
Answer: B
Rationale: Compressive strength tests (e.g., concrete cubes or
cylinders) verify concrete meets design strength.
9. For a contractor, which insurance is most relevant before starting
assembling prefabricated structures on site?
A. Life insurance for workers
B. Public liability insurance and contractor’s all-risks insurance
C. Automobile insurance
D. Travel insurance
Answer: B
Rationale: Public liability protects against damage or injury during
onsite work; contractor’s all-risks covers materials and workmanship.
10. Which of the following is a key health and safety concern during
lifting and hoisting of prefabricated elements?
A. Painting the elements before lifting
B. Overloading the crane beyond capacity
C. Using manual labor instead of mechanical lifting
D. Wearing reflective vests
Answer: B
Rationale: Overloading can lead to crane failure, dropped loads —
posing serious safety hazard.
11. What is the main advantage of using light-gauge steel framing
over traditional timber framing in prefabrication?
A. Better sound absorption
B. Non-combustibility and resistance to pests
