Commercial Building Contractor Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales
2025|2026 Q&A | Instant Download Pdf
1. What is the minimum live load for office floors in commercial
buildings?
A. 40 psf
B. 50 psf
C. 75 psf
D. 100 psf
Live load requirements for offices are typically 50 psf according to
building codes.
2. Which type of fire-resistive rating is required for structural steel
columns in a Type I building?
A. 1 hour
B. 2 hours
, C. 3 hours
D. 4 hours
Columns in Type I construction must generally be fire-protected for 3
hours to meet safety standards.
3. What is the maximum allowable slump for structural concrete used in
foundations without admixtures?
A. 2 inches
B. 3 inches
C. 4 inches
D. 6 inches
ACI code limits slump for structural concrete to about 4 inches without
plasticizers.
4. Which test determines the compressive strength of concrete?
A. Slump test
B. Schmidt hammer
C. Cylinder test
D. Vicat needle
Concrete cylinders are cast and tested to measure compressive
strength.
5. What is the primary purpose of a vapor barrier under a slab?
A. Reduce shrinkage cracks
B. Prevent moisture migration
C. Increase strength
, D. Allow drainage
Vapor barriers prevent moisture from migrating into slabs and
damaging finishes.
6. In steel construction, what is the most common method of connecting
beams to columns?
A. Welding
B. Bolting
C. Riveting
D. Adhesives
Bolting is the most widely used connection method due to speed and
reliability.
7. Which of the following best describes “dead load”?
A. Load due to occupants
B. Weight of permanent structural components
C. Wind load
D. Snow load
Dead load is the permanent weight of the structure and materials.
8. A soil with high clay content typically has:
A. High permeability
B. Low permeability
C. High bearing capacity
D. Excellent drainage
Clay soils hold water and have very low permeability.
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales
2025|2026 Q&A | Instant Download Pdf
1. What is the minimum live load for office floors in commercial
buildings?
A. 40 psf
B. 50 psf
C. 75 psf
D. 100 psf
Live load requirements for offices are typically 50 psf according to
building codes.
2. Which type of fire-resistive rating is required for structural steel
columns in a Type I building?
A. 1 hour
B. 2 hours
, C. 3 hours
D. 4 hours
Columns in Type I construction must generally be fire-protected for 3
hours to meet safety standards.
3. What is the maximum allowable slump for structural concrete used in
foundations without admixtures?
A. 2 inches
B. 3 inches
C. 4 inches
D. 6 inches
ACI code limits slump for structural concrete to about 4 inches without
plasticizers.
4. Which test determines the compressive strength of concrete?
A. Slump test
B. Schmidt hammer
C. Cylinder test
D. Vicat needle
Concrete cylinders are cast and tested to measure compressive
strength.
5. What is the primary purpose of a vapor barrier under a slab?
A. Reduce shrinkage cracks
B. Prevent moisture migration
C. Increase strength
, D. Allow drainage
Vapor barriers prevent moisture from migrating into slabs and
damaging finishes.
6. In steel construction, what is the most common method of connecting
beams to columns?
A. Welding
B. Bolting
C. Riveting
D. Adhesives
Bolting is the most widely used connection method due to speed and
reliability.
7. Which of the following best describes “dead load”?
A. Load due to occupants
B. Weight of permanent structural components
C. Wind load
D. Snow load
Dead load is the permanent weight of the structure and materials.
8. A soil with high clay content typically has:
A. High permeability
B. Low permeability
C. High bearing capacity
D. Excellent drainage
Clay soils hold water and have very low permeability.
