AZ L-20 Demolition Contractor Exam
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A| Instant
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1. What is the primary purpose of a pre-demolition inspection?
a. To determine the paint colors used in the building
b. To identify structural conditions, hazards, and materials requiring
special handling
c. To estimate the building's resale value
d. To determine the number of workers needed for cleanup only
Answer: b. To identify structural conditions, hazards, and materials
requiring special handling
Rationale: A pre-demolition inspection provides essential information
about the building's construction, structural stability, utilities,
hazardous materials, and surrounding conditions. This information
,allows the contractor to plan the demolition sequence and protective
measures safely.
2. Before beginning demolition, which condition should be verified
regarding electrical service?
a. All interior light fixtures are decorative
b. Electrical circuits are identified and appropriately disconnected or
de-energized
c. Extension cords are installed throughout the building
d. Temporary lighting is connected to permanent circuits
Answer: b. Electrical circuits are identified and appropriately
disconnected or de-energized
Rationale: Unexpected energized electrical systems can cause
electrocution, arc flash, fire, and equipment hazards. The demolition
plan should account for electrical service and ensure that systems are
safely disconnected, locked out, or otherwise controlled before work
begins.
,3. Which demolition method generally involves dismantling a
structure in a controlled sequence rather than simply bringing it down
at once?
a. Selective demolition
b. Flooding
c. Random demolition
d. Surface painting
Answer: a. Selective demolition
Rationale: Selective demolition removes designated components
while preserving other portions of a structure. It requires careful
sequencing because remaining structural members may depend on
components that are being removed.
4. Why is the demolition sequence important?
a. It determines the building's architectural style
b. It helps prevent uncontrolled collapse and protects workers and
nearby property
c. It eliminates the need for personal protective equipment
d. It guarantees that all debris will be recyclable
, Answer: b. It helps prevent uncontrolled collapse and protects
workers and nearby property
Rationale: Buildings can become unstable as structural components
are removed. A planned sequence maintains stability as long as
practical and reduces the possibility of premature or uncontrolled
collapse.
5. What should be done if demolition work reveals an unexpected
structural condition?
a. Continue work without interruption
b. Increase equipment speed
c. Stop and reassess the condition before proceeding
d. Remove additional structural members immediately
Answer: c. Stop and reassess the condition before proceeding
Rationale: Unexpected conditions may indicate hidden structural
weaknesses, undocumented alterations, voids, or other hazards. Work
should be paused and the demolition plan evaluated before the
affected area is disturbed further.
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 paint colors used in the building
b. To identify structural conditions, hazards, and materials requiring
special handling
c. To estimate the building's resale value
d. To determine the number of workers needed for cleanup only
Answer: b. To identify structural conditions, hazards, and materials
requiring special handling
Rationale: A pre-demolition inspection provides essential information
about the building's construction, structural stability, utilities,
hazardous materials, and surrounding conditions. This information
,allows the contractor to plan the demolition sequence and protective
measures safely.
2. Before beginning demolition, which condition should be verified
regarding electrical service?
a. All interior light fixtures are decorative
b. Electrical circuits are identified and appropriately disconnected or
de-energized
c. Extension cords are installed throughout the building
d. Temporary lighting is connected to permanent circuits
Answer: b. Electrical circuits are identified and appropriately
disconnected or de-energized
Rationale: Unexpected energized electrical systems can cause
electrocution, arc flash, fire, and equipment hazards. The demolition
plan should account for electrical service and ensure that systems are
safely disconnected, locked out, or otherwise controlled before work
begins.
,3. Which demolition method generally involves dismantling a
structure in a controlled sequence rather than simply bringing it down
at once?
a. Selective demolition
b. Flooding
c. Random demolition
d. Surface painting
Answer: a. Selective demolition
Rationale: Selective demolition removes designated components
while preserving other portions of a structure. It requires careful
sequencing because remaining structural members may depend on
components that are being removed.
4. Why is the demolition sequence important?
a. It determines the building's architectural style
b. It helps prevent uncontrolled collapse and protects workers and
nearby property
c. It eliminates the need for personal protective equipment
d. It guarantees that all debris will be recyclable
, Answer: b. It helps prevent uncontrolled collapse and protects
workers and nearby property
Rationale: Buildings can become unstable as structural components
are removed. A planned sequence maintains stability as long as
practical and reduces the possibility of premature or uncontrolled
collapse.
5. What should be done if demolition work reveals an unexpected
structural condition?
a. Continue work without interruption
b. Increase equipment speed
c. Stop and reassess the condition before proceeding
d. Remove additional structural members immediately
Answer: c. Stop and reassess the condition before proceeding
Rationale: Unexpected conditions may indicate hidden structural
weaknesses, undocumented alterations, voids, or other hazards. Work
should be paused and the demolition plan evaluated before the
affected area is disturbed further.
