AZ L-79 Structural Demolition Exam
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
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1. What is the primary purpose of a pre-demolition structural
survey?
a. To determine the building's resale value
b. To identify decorative features for preservation
c. To determine structural conditions and potential hazards
d. To establish the final cleanup cost
Answer: c. To determine structural conditions and potential hazards
Rationale: A pre-demolition structural survey helps identify the
building's structural system, deterioration, unstable components,
adjacent structures, and conditions that could affect demolition. This
information is essential for developing a safe demolition sequence and
protecting workers and the public.
, 2. Before structural demolition begins, which condition should
receive priority?
a. Interior paint color
b. Existing structural stability
c. Flooring material selection
d. Landscaping condition
Answer: b. Existing structural stability
Rationale: Structural stability is a critical safety concern during
demolition. Removing walls, floors, beams, columns, or other load-
bearing elements can cause an unintended collapse if the sequence is
not properly controlled.
3. Which document typically provides important information about
the original structural design of a building?
a. Landscaping plan
b. Structural drawings
c. Furniture inventory
d. Cleaning schedule
Answer: b. Structural drawings
Rationale: Structural drawings can show beams, columns, load-bearing
walls, slabs, foundations, connections, and other structural
,components. They should be reviewed along with an on-site survey
because actual conditions may differ from the original plans.
4. What is a major danger of removing a load-bearing column
without proper planning?
a. Excessive dust
b. Structural collapse
c. Paint discoloration
d. Increased lighting
Answer: b. Structural collapse
Rationale: A load-bearing column transfers loads to lower structural
elements and ultimately to the foundation. Removing it without
providing an engineered load path or temporary support can cause
localized or progressive collapse.
5. Which activity should generally occur before demolition of a
building containing energized electrical systems?
a. Install new flooring
b. Disconnect and verify the electrical service
c. Remove all windows
d. Paint the exterior
Answer: b. Disconnect and verify the electrical service
, Rationale: Electrical systems must be properly shut down, isolated, and
verified before demolition work exposes workers to energized
conductors. Lockout/tagout procedures may also be required to prevent
accidental re-energization.
6. Why must utilities be identified before demolition?
a. To improve the building's appearance
b. To prevent accidental contact with hazardous services
c. To determine the paint manufacturer
d. To calculate office occupancy
Answer: b. To prevent accidental contact with hazardous services
Rationale: Water, gas, electricity, steam, communications, and other
utilities can create serious hazards if they remain active during
demolition. Identification, isolation, and verification help prevent
electrocution, fire, flooding, explosions, and other incidents.
7. Which utility presents a particularly serious fire or explosion
hazard if damaged during demolition?
a. Natural gas
b. Telephone cable
c. Fiber-optic cable
d. Low-voltage data cable
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf
1. What is the primary purpose of a pre-demolition structural
survey?
a. To determine the building's resale value
b. To identify decorative features for preservation
c. To determine structural conditions and potential hazards
d. To establish the final cleanup cost
Answer: c. To determine structural conditions and potential hazards
Rationale: A pre-demolition structural survey helps identify the
building's structural system, deterioration, unstable components,
adjacent structures, and conditions that could affect demolition. This
information is essential for developing a safe demolition sequence and
protecting workers and the public.
, 2. Before structural demolition begins, which condition should
receive priority?
a. Interior paint color
b. Existing structural stability
c. Flooring material selection
d. Landscaping condition
Answer: b. Existing structural stability
Rationale: Structural stability is a critical safety concern during
demolition. Removing walls, floors, beams, columns, or other load-
bearing elements can cause an unintended collapse if the sequence is
not properly controlled.
3. Which document typically provides important information about
the original structural design of a building?
a. Landscaping plan
b. Structural drawings
c. Furniture inventory
d. Cleaning schedule
Answer: b. Structural drawings
Rationale: Structural drawings can show beams, columns, load-bearing
walls, slabs, foundations, connections, and other structural
,components. They should be reviewed along with an on-site survey
because actual conditions may differ from the original plans.
4. What is a major danger of removing a load-bearing column
without proper planning?
a. Excessive dust
b. Structural collapse
c. Paint discoloration
d. Increased lighting
Answer: b. Structural collapse
Rationale: A load-bearing column transfers loads to lower structural
elements and ultimately to the foundation. Removing it without
providing an engineered load path or temporary support can cause
localized or progressive collapse.
5. Which activity should generally occur before demolition of a
building containing energized electrical systems?
a. Install new flooring
b. Disconnect and verify the electrical service
c. Remove all windows
d. Paint the exterior
Answer: b. Disconnect and verify the electrical service
, Rationale: Electrical systems must be properly shut down, isolated, and
verified before demolition work exposes workers to energized
conductors. Lockout/tagout procedures may also be required to prevent
accidental re-energization.
6. Why must utilities be identified before demolition?
a. To improve the building's appearance
b. To prevent accidental contact with hazardous services
c. To determine the paint manufacturer
d. To calculate office occupancy
Answer: b. To prevent accidental contact with hazardous services
Rationale: Water, gas, electricity, steam, communications, and other
utilities can create serious hazards if they remain active during
demolition. Identification, isolation, and verification help prevent
electrocution, fire, flooding, explosions, and other incidents.
7. Which utility presents a particularly serious fire or explosion
hazard if damaged during demolition?
a. Natural gas
b. Telephone cable
c. Fiber-optic cable
d. Low-voltage data cable
