AL DW Demolition & Wrecking
Contractor Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2027 Q&A | Instant
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1. What is the primary purpose of a pre-demolition inspection?
A. To determine the resale value of the building
B. To identify structural conditions, hazards, and materials that may affect
demolition
C. To select the cheapest equipment
D. To eliminate the need for a demolition plan
Answer: B. To identify structural conditions, hazards, and materials that
may affect demolition
Rationale: A thorough pre-demolition inspection identifies structural
weaknesses, hazardous materials, utilities, adjacent structures, and other
conditions that must be addressed before work begins.
, 2. Before demolition begins, which utility should be verified as
disconnected, isolated, or otherwise safely controlled?
A. Only electrical service
B. Only water service
C. All applicable utilities serving the structure
D. Only telephone service
Answer: C. All applicable utilities serving the structure
Rationale: Electrical, gas, water, sewer, steam, communications, and other
utilities can create serious hazards if not properly identified and controlled.
3. Which document normally establishes the planned sequence and
methods for dismantling a structure?
A. Demolition plan
B. Sales invoice
C. Payroll report
D. Equipment warranty
Answer: A. Demolition plan
Rationale: The demolition plan identifies the sequence, equipment,
procedures, hazards, protective measures, and other controls required for
safe demolition.
, 4. What is the safest general principle when demolishing a multistory
structure?
A. Remove lower structural members first
B. Work from the bottom upward
C. Maintain controlled stability while progressing systematically
D. Remove all exterior walls simultaneously
Answer: C. Maintain controlled stability while progressing systematically
Rationale: Demolition must be sequenced so the remaining structure
remains stable and uncontrolled collapse is prevented.
5. What is a major hazard associated with an uncontrolled structural
collapse?
A. Reduced fuel consumption
B. Falling debris and sudden release of stored energy
C. Improved material separation
D. Lower noise levels
Answer: B. Falling debris and sudden release of stored energy
Rationale: Structural collapse can generate unpredictable debris
movement, dust, vibration, and crushing hazards over a wide area.
6. What should be established around an active demolition area?
, A. An unrestricted pedestrian route
B. A controlled exclusion zone
C. A public parking area
D. An employee recreation area
Answer: B. A controlled exclusion zone
Rationale: Barricades, warning signs, access controls, and exclusion zones
help prevent unauthorized persons from entering hazardous areas.
7. Why is dust suppression important during demolition?
A. It increases structural loading
B. It reduces visibility only
C. It helps control airborne particulate exposure and improves site
conditions
D. It eliminates the need for respiratory protection
Answer: C. It helps control airborne particulate exposure and improves site
conditions
Rationale: Water misting and other controls can reduce airborne dust, but
respiratory protection may still be required when hazards remain.
8. Which condition requires particular attention before demolishing a
load-bearing wall?
Contractor Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationales 2027 Q&A | Instant
Download Pdf
1. What is the primary purpose of a pre-demolition inspection?
A. To determine the resale value of the building
B. To identify structural conditions, hazards, and materials that may affect
demolition
C. To select the cheapest equipment
D. To eliminate the need for a demolition plan
Answer: B. To identify structural conditions, hazards, and materials that
may affect demolition
Rationale: A thorough pre-demolition inspection identifies structural
weaknesses, hazardous materials, utilities, adjacent structures, and other
conditions that must be addressed before work begins.
, 2. Before demolition begins, which utility should be verified as
disconnected, isolated, or otherwise safely controlled?
A. Only electrical service
B. Only water service
C. All applicable utilities serving the structure
D. Only telephone service
Answer: C. All applicable utilities serving the structure
Rationale: Electrical, gas, water, sewer, steam, communications, and other
utilities can create serious hazards if not properly identified and controlled.
3. Which document normally establishes the planned sequence and
methods for dismantling a structure?
A. Demolition plan
B. Sales invoice
C. Payroll report
D. Equipment warranty
Answer: A. Demolition plan
Rationale: The demolition plan identifies the sequence, equipment,
procedures, hazards, protective measures, and other controls required for
safe demolition.
, 4. What is the safest general principle when demolishing a multistory
structure?
A. Remove lower structural members first
B. Work from the bottom upward
C. Maintain controlled stability while progressing systematically
D. Remove all exterior walls simultaneously
Answer: C. Maintain controlled stability while progressing systematically
Rationale: Demolition must be sequenced so the remaining structure
remains stable and uncontrolled collapse is prevented.
5. What is a major hazard associated with an uncontrolled structural
collapse?
A. Reduced fuel consumption
B. Falling debris and sudden release of stored energy
C. Improved material separation
D. Lower noise levels
Answer: B. Falling debris and sudden release of stored energy
Rationale: Structural collapse can generate unpredictable debris
movement, dust, vibration, and crushing hazards over a wide area.
6. What should be established around an active demolition area?
, A. An unrestricted pedestrian route
B. A controlled exclusion zone
C. A public parking area
D. An employee recreation area
Answer: B. A controlled exclusion zone
Rationale: Barricades, warning signs, access controls, and exclusion zones
help prevent unauthorized persons from entering hazardous areas.
7. Why is dust suppression important during demolition?
A. It increases structural loading
B. It reduces visibility only
C. It helps control airborne particulate exposure and improves site
conditions
D. It eliminates the need for respiratory protection
Answer: C. It helps control airborne particulate exposure and improves site
conditions
Rationale: Water misting and other controls can reduce airborne dust, but
respiratory protection may still be required when hazards remain.
8. Which condition requires particular attention before demolishing a
load-bearing wall?
