AL BC-B Building Construction
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationale2026 Q&A| Instant
Download Pdf
1. What is the primary purpose of a building permit?
A. To ensure the contractor gets paid
B. To guarantee materials are used
C. To ensure construction complies with local building codes
D. To check project aesthetics
Rationale: Building permits ensure that construction meets safety,
zoning, and code requirements.
2. What is the minimum concrete compressive strength for residential
foundations in most areas?
A. 10 MPa
B. 15 MPa
C. 20 MPa
D. 25 MPa
Rationale: 20 MPa is commonly used as a standard minimum for
residential concrete to ensure adequate strength.
3. Which type of soil is best for supporting a building foundation?
A. Clay
B. Sand
C. Gravel
D. Silt
, Rationale: Gravel provides good load-bearing capacity and proper
drainage, making it ideal for foundations.
4. What is the standard thickness of a reinforced concrete slab in a typical
residential building?
A. 75 mm
B. 100 mm
C. 150 mm
D. 200 mm
Rationale: 150 mm is a common thickness for residential slabs,
balancing strength and cost.
5. Which of the following is a primary responsibility of a building
contractor?
A. Selling construction materials
B. Inspecting neighboring properties
C. Managing construction projects
D. Designing structural elements
Rationale: Contractors manage construction, including scheduling,
labor, and material procurement.
6. What does “curing” of concrete involve?
A. Painting the concrete
B. Maintaining moisture and temperature for proper hardening
C. Adding extra cement
D. Sanding the surface
Rationale: Curing ensures concrete reaches its design strength by
preventing premature drying.
7. Which of the following materials is commonly used for damp-proofing
foundations?
A. Sand
B. Gravel
C. Bituminous membrane
D. Wood
Rationale: Bituminous membranes prevent moisture penetration into
foundations.
8. Which document specifies the scope and requirements of a construction
project?
A. Invoice
B. Receipt
, C. Contract
D. Warranty
Rationale: A contract legally defines project scope, cost, and
responsibilities.
9. What is the typical minimum height of a residential ceiling?
A. 2.2 m
B. 2.4 m
C. 2.6 m
D. 3.0 m
Rationale: 2.4 m is the minimum standard to ensure adequate
ventilation and comfort.
10. Which tool is used to check the vertical alignment of a wall?
A. Spirit level
B. Plumb bob
C. Measuring tape
D. Trowel
Rationale: A plumb bob ensures walls are perfectly vertical.
11. Which of the following is a load that a building structure must
support permanently?
A. Wind load
B. Earthquake load
C. Dead load
D. Live load
Rationale: Dead load refers to the permanent weight of structural
components.
12. What is the main purpose of reinforcement bars (rebar) in
concrete?
A. To reduce cost
B. To resist tensile forces
C. To prevent shrinkage cracks
D. To improve color
Rationale: Concrete is strong in compression but weak in tension;
rebar provides tensile strength.
13. Which type of roof is most suitable for heavy rainfall areas?
A. Flat roof
B. Pitched roof
C. Green roof
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationale2026 Q&A| Instant
Download Pdf
1. What is the primary purpose of a building permit?
A. To ensure the contractor gets paid
B. To guarantee materials are used
C. To ensure construction complies with local building codes
D. To check project aesthetics
Rationale: Building permits ensure that construction meets safety,
zoning, and code requirements.
2. What is the minimum concrete compressive strength for residential
foundations in most areas?
A. 10 MPa
B. 15 MPa
C. 20 MPa
D. 25 MPa
Rationale: 20 MPa is commonly used as a standard minimum for
residential concrete to ensure adequate strength.
3. Which type of soil is best for supporting a building foundation?
A. Clay
B. Sand
C. Gravel
D. Silt
, Rationale: Gravel provides good load-bearing capacity and proper
drainage, making it ideal for foundations.
4. What is the standard thickness of a reinforced concrete slab in a typical
residential building?
A. 75 mm
B. 100 mm
C. 150 mm
D. 200 mm
Rationale: 150 mm is a common thickness for residential slabs,
balancing strength and cost.
5. Which of the following is a primary responsibility of a building
contractor?
A. Selling construction materials
B. Inspecting neighboring properties
C. Managing construction projects
D. Designing structural elements
Rationale: Contractors manage construction, including scheduling,
labor, and material procurement.
6. What does “curing” of concrete involve?
A. Painting the concrete
B. Maintaining moisture and temperature for proper hardening
C. Adding extra cement
D. Sanding the surface
Rationale: Curing ensures concrete reaches its design strength by
preventing premature drying.
7. Which of the following materials is commonly used for damp-proofing
foundations?
A. Sand
B. Gravel
C. Bituminous membrane
D. Wood
Rationale: Bituminous membranes prevent moisture penetration into
foundations.
8. Which document specifies the scope and requirements of a construction
project?
A. Invoice
B. Receipt
, C. Contract
D. Warranty
Rationale: A contract legally defines project scope, cost, and
responsibilities.
9. What is the typical minimum height of a residential ceiling?
A. 2.2 m
B. 2.4 m
C. 2.6 m
D. 3.0 m
Rationale: 2.4 m is the minimum standard to ensure adequate
ventilation and comfort.
10. Which tool is used to check the vertical alignment of a wall?
A. Spirit level
B. Plumb bob
C. Measuring tape
D. Trowel
Rationale: A plumb bob ensures walls are perfectly vertical.
11. Which of the following is a load that a building structure must
support permanently?
A. Wind load
B. Earthquake load
C. Dead load
D. Live load
Rationale: Dead load refers to the permanent weight of structural
components.
12. What is the main purpose of reinforcement bars (rebar) in
concrete?
A. To reduce cost
B. To resist tensile forces
C. To prevent shrinkage cracks
D. To improve color
Rationale: Concrete is strong in compression but weak in tension;
rebar provides tensile strength.
13. Which type of roof is most suitable for heavy rainfall areas?
A. Flat roof
B. Pitched roof
C. Green roof
