Hawaii General Building Contractor
(Class B) Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. Which of the following is the primary purpose of a building permit?
A. To increase property value
B. To ensure compliance with building codes
C. To verify contractor qualifications
D. To speed up construction
Answer: B. To ensure compliance with building codes
Rationale: A building permit ensures that construction meets safety,
zoning, and code requirements, protecting both occupants and the public.
2. What is the minimum slope required for a residential roof to ensure
proper drainage?
,A. 1/4 inch per foot
B. 1/2 inch per foot
C. 1 inch per foot
D. 2 inches per foot
Answer: A. 1/4 inch per foot
Rationale: Residential roofs typically require at least a 1/4 inch per foot
slope to allow water to drain properly and prevent pooling or leakage.
3. Which type of soil is most prone to expansive movement that can
damage foundations?
A. Sandy soil
B. Clay soil
C. Gravel
D. Silt
Answer: B. Clay soil
Rationale: Clay soil absorbs water and expands, then contracts when dry,
which can cause foundation movement and cracking.
4. When installing a concrete slab, what is the primary reason for
reinforcing with steel?
A. To prevent cracking due to shrinkage and load
B. To improve appearance
C. To reduce weight
D. To speed curing time
,Answer: A. To prevent cracking due to shrinkage and load
Rationale: Steel reinforcement (rebar or mesh) strengthens concrete,
helping it resist tension, shrinkage, and structural loads.
5. Which type of fire-resistant rating is required for a two-hour-rated wall?
A. 30 minutes
B. 1 hour
C. 2 hours
D. 4 hours
Answer: C. 2 hours
Rationale: A two-hour fire-rated wall must resist fire exposure for two
hours to help contain fire and protect occupants.
6. What is the standard thickness for interior gypsum wallboard in
residential construction?
A. 1/4 inch
B. 3/8 inch
C. 1/2 inch
D. 5/8 inch
Answer: C. 1/2 inch
Rationale: Standard residential interior walls typically use 1/2 inch
drywall, which balances strength and ease of installation.
7. Which of the following best describes the function of a vapor barrier in a
wall assembly?
, A. To provide structural support
B. To prevent moisture from entering wall cavities
C. To act as insulation
D. To enhance paint adhesion
Answer: B. To prevent moisture from entering wall cavities
Rationale: A vapor barrier reduces moisture infiltration, preventing mold,
rot, and structural damage.
8. How often should scaffolding be inspected by a competent person?
A. Weekly
B. Daily
C. Monthly
D. Before each shift
Answer: D. Before each shift
Rationale: OSHA requires scaffolds to be inspected for safety hazards
before each work shift and after any incident that could affect integrity.
9. What is the primary purpose of a footing in foundation construction?
A. To anchor the building to the ground
B. To distribute the load over a larger soil area
C. To prevent water infiltration
D. To support plumbing systems
(Class B) Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. Which of the following is the primary purpose of a building permit?
A. To increase property value
B. To ensure compliance with building codes
C. To verify contractor qualifications
D. To speed up construction
Answer: B. To ensure compliance with building codes
Rationale: A building permit ensures that construction meets safety,
zoning, and code requirements, protecting both occupants and the public.
2. What is the minimum slope required for a residential roof to ensure
proper drainage?
,A. 1/4 inch per foot
B. 1/2 inch per foot
C. 1 inch per foot
D. 2 inches per foot
Answer: A. 1/4 inch per foot
Rationale: Residential roofs typically require at least a 1/4 inch per foot
slope to allow water to drain properly and prevent pooling or leakage.
3. Which type of soil is most prone to expansive movement that can
damage foundations?
A. Sandy soil
B. Clay soil
C. Gravel
D. Silt
Answer: B. Clay soil
Rationale: Clay soil absorbs water and expands, then contracts when dry,
which can cause foundation movement and cracking.
4. When installing a concrete slab, what is the primary reason for
reinforcing with steel?
A. To prevent cracking due to shrinkage and load
B. To improve appearance
C. To reduce weight
D. To speed curing time
,Answer: A. To prevent cracking due to shrinkage and load
Rationale: Steel reinforcement (rebar or mesh) strengthens concrete,
helping it resist tension, shrinkage, and structural loads.
5. Which type of fire-resistant rating is required for a two-hour-rated wall?
A. 30 minutes
B. 1 hour
C. 2 hours
D. 4 hours
Answer: C. 2 hours
Rationale: A two-hour fire-rated wall must resist fire exposure for two
hours to help contain fire and protect occupants.
6. What is the standard thickness for interior gypsum wallboard in
residential construction?
A. 1/4 inch
B. 3/8 inch
C. 1/2 inch
D. 5/8 inch
Answer: C. 1/2 inch
Rationale: Standard residential interior walls typically use 1/2 inch
drywall, which balances strength and ease of installation.
7. Which of the following best describes the function of a vapor barrier in a
wall assembly?
, A. To provide structural support
B. To prevent moisture from entering wall cavities
C. To act as insulation
D. To enhance paint adhesion
Answer: B. To prevent moisture from entering wall cavities
Rationale: A vapor barrier reduces moisture infiltration, preventing mold,
rot, and structural damage.
8. How often should scaffolding be inspected by a competent person?
A. Weekly
B. Daily
C. Monthly
D. Before each shift
Answer: D. Before each shift
Rationale: OSHA requires scaffolds to be inspected for safety hazards
before each work shift and after any incident that could affect integrity.
9. What is the primary purpose of a footing in foundation construction?
A. To anchor the building to the ground
B. To distribute the load over a larger soil area
C. To prevent water infiltration
D. To support plumbing systems
