AL DW Demolition & Wrecking Contractor
Exam Questions and Correct Answers
(Verified Answers) Plus Rationale 2027
Q&A| Instant Download Pdf
1 What is the primary purpose of a pre-demolition inspection?
a. To determine the final selling price of the property
b. To identify structural conditions, hazards, utilities, and materials that
may affect demolition
c. To eliminate the need for a demolition plan
d. To determine the color of the replacement building
Answer: b. To identify structural conditions, hazards, utilities, and
materials that may affect demolition
Rationale: A pre-demolition inspection establishes the condition of the
structure and identifies hazards such as unstable components,
energized utilities, hazardous materials, and adjacent structures. This
,information is essential for developing a safe and orderly demolition
plan.
2. Before demolition begins, what should generally happen to
electrical, gas, water, and other utility services?
a. They should remain energized throughout the project
b. They should be disconnected or otherwise safely controlled as
required
c. Only electrical service should be disconnected
d. Utilities should be disconnected after demolition starts
Answer: b. They should be disconnected or otherwise safely
controlled as required
Rationale: Uncontrolled utilities can expose workers and the public to
electrocution, fire, flooding, explosions, and other hazards. Utility
isolation should be coordinated with the appropriate utility providers
before demolition activities begin.
3. Which demolition method generally involves taking a structure
apart in a controlled sequence rather than simply bringing it down
at once?
a. Selective demolition
b. Random demolition
,c. Uncontrolled demolition
d. Emergency dumping
Answer: a. Selective demolition
Rationale: Selective demolition removes specified portions or materials
while preserving other parts of the structure. It requires careful planning
because remaining structural elements must continue to be adequately
supported.
4. Why is structural shoring used during demolition?
a. To increase the building's resale value
b. To support portions of a structure that may become unstable
c. To make debris heavier
d. To replace all personal protective equipment
Answer: b. To support portions of a structure that may become
unstable
Rationale: Demolition can remove structural members that previously
carried loads. Shoring provides temporary support and helps prevent
unintended collapse of remaining structural components.
5. What is one of the greatest hazards associated with uncontrolled
structural collapse?
, a. Excessive paint drying
b. Falling debris and unexpected structural movement
c. Reduced paperwork
d. Low material recycling rates
Answer: b. Falling debris and unexpected structural movement
Rationale: An uncontrolled collapse can send debris beyond the planned
work area and expose workers, pedestrians, equipment operators, and
neighboring properties to serious hazards. Demolition should therefore
proceed according to a planned sequence.
6. Which document is particularly useful for identifying the planned
sequence of demolition operations?
a. Demolition plan
b. Employee vacation schedule
c. Sales invoice
d. Equipment warranty
Answer: a. Demolition plan
Rationale: A demolition plan identifies the structure, work methods,
sequence, equipment, hazards, controls, and other relevant project
information. A well-developed plan helps the contractor coordinate
work safely.
Exam Questions and Correct Answers
(Verified Answers) Plus Rationale 2027
Q&A| Instant Download Pdf
1 What is the primary purpose of a pre-demolition inspection?
a. To determine the final selling price of the property
b. To identify structural conditions, hazards, utilities, and materials that
may affect demolition
c. To eliminate the need for a demolition plan
d. To determine the color of the replacement building
Answer: b. To identify structural conditions, hazards, utilities, and
materials that may affect demolition
Rationale: A pre-demolition inspection establishes the condition of the
structure and identifies hazards such as unstable components,
energized utilities, hazardous materials, and adjacent structures. This
,information is essential for developing a safe and orderly demolition
plan.
2. Before demolition begins, what should generally happen to
electrical, gas, water, and other utility services?
a. They should remain energized throughout the project
b. They should be disconnected or otherwise safely controlled as
required
c. Only electrical service should be disconnected
d. Utilities should be disconnected after demolition starts
Answer: b. They should be disconnected or otherwise safely
controlled as required
Rationale: Uncontrolled utilities can expose workers and the public to
electrocution, fire, flooding, explosions, and other hazards. Utility
isolation should be coordinated with the appropriate utility providers
before demolition activities begin.
3. Which demolition method generally involves taking a structure
apart in a controlled sequence rather than simply bringing it down
at once?
a. Selective demolition
b. Random demolition
,c. Uncontrolled demolition
d. Emergency dumping
Answer: a. Selective demolition
Rationale: Selective demolition removes specified portions or materials
while preserving other parts of the structure. It requires careful planning
because remaining structural elements must continue to be adequately
supported.
4. Why is structural shoring used during demolition?
a. To increase the building's resale value
b. To support portions of a structure that may become unstable
c. To make debris heavier
d. To replace all personal protective equipment
Answer: b. To support portions of a structure that may become
unstable
Rationale: Demolition can remove structural members that previously
carried loads. Shoring provides temporary support and helps prevent
unintended collapse of remaining structural components.
5. What is one of the greatest hazards associated with uncontrolled
structural collapse?
, a. Excessive paint drying
b. Falling debris and unexpected structural movement
c. Reduced paperwork
d. Low material recycling rates
Answer: b. Falling debris and unexpected structural movement
Rationale: An uncontrolled collapse can send debris beyond the planned
work area and expose workers, pedestrians, equipment operators, and
neighboring properties to serious hazards. Demolition should therefore
proceed according to a planned sequence.
6. Which document is particularly useful for identifying the planned
sequence of demolition operations?
a. Demolition plan
b. Employee vacation schedule
c. Sales invoice
d. Equipment warranty
Answer: a. Demolition plan
Rationale: A demolition plan identifies the structure, work methods,
sequence, equipment, hazards, controls, and other relevant project
information. A well-developed plan helps the contractor coordinate
work safely.
