CO Wrecking 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 building's resale value
B. To identify structural conditions, hazards, utilities, and materials that
may affect demolition
C. To establish the final landscaping plan
D. To calculate the building's original construction cost
Answer: B. To identify structural conditions, hazards, utilities, and
materials that may affect demolition
Rationale: A pre-demolition inspection provides critical information
about the structure and site before work begins. It helps identify
structural weaknesses, hazardous materials, utility connections,
,adjacent structures, and other conditions that must be considered
when developing a safe demolition plan.
2. Before beginning wrecking work, which condition should be
verified regarding electrical service?
A. That all light fixtures are removed
B. That the electrical service has been properly disconnected or
otherwise controlled
C. That all electrical panels are painted
D. That temporary lighting has been installed inside the building
Answer: B. That the electrical service has been properly disconnected
or otherwise controlled
Rationale: Energized electrical systems can create electrocution, fire,
and equipment hazards during demolition. The contractor should
coordinate with the appropriate utility or responsible party and verify
that electrical service has been safely disconnected, isolated, or
otherwise controlled before demolition activities expose electrical
components.
3. Which demolition method involves dismantling a structure
systematically from the top downward?
,A. Top-down demolition
B. Undercutting
C. Undermining
D. Controlled foundation release
Answer: A. Top-down demolition
Rationale: Top-down demolition removes a structure progressively
from its upper portions toward the lower levels. This method can
provide controlled sequencing and is commonly used where
surrounding buildings, streets, utilities, or other site constraints
require careful control of debris and structural stability.
4. What is the greatest concern when removing a load-bearing wall
prematurely?
A. Increased dust production
B. Loss of structural stability
C. Reduced lighting
D. Damage to hand tools
Answer: B. Loss of structural stability
Rationale: Load-bearing walls transfer structural loads. Removing one
without proper engineering, temporary shoring, or an appropriate
sequence can cause partial or complete structural collapse. Demolition
, must therefore follow an engineered or otherwise properly
established sequence.
5. Which item is most important when evaluating an adjacent
building before demolition?
A. Its exterior paint color
B. Its structural condition and proximity to the demolition area
C. The age of its landscaping
D. The number of windows it contains
Answer: B. Its structural condition and proximity to the demolition
area
Rationale: Adjacent structures can be affected by vibration, falling
debris, excavation, loss of lateral support, or changes in ground
conditions. Their condition and proximity should be evaluated so
appropriate protective measures can be established.
6. What is the purpose of temporary shoring during demolition?
A. To increase building occupancy
B. To provide temporary structural support while permanent structural
elements are removed
C. To reduce equipment fuel consumption
D. To improve the appearance of the structure
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 building's resale value
B. To identify structural conditions, hazards, utilities, and materials that
may affect demolition
C. To establish the final landscaping plan
D. To calculate the building's original construction cost
Answer: B. To identify structural conditions, hazards, utilities, and
materials that may affect demolition
Rationale: A pre-demolition inspection provides critical information
about the structure and site before work begins. It helps identify
structural weaknesses, hazardous materials, utility connections,
,adjacent structures, and other conditions that must be considered
when developing a safe demolition plan.
2. Before beginning wrecking work, which condition should be
verified regarding electrical service?
A. That all light fixtures are removed
B. That the electrical service has been properly disconnected or
otherwise controlled
C. That all electrical panels are painted
D. That temporary lighting has been installed inside the building
Answer: B. That the electrical service has been properly disconnected
or otherwise controlled
Rationale: Energized electrical systems can create electrocution, fire,
and equipment hazards during demolition. The contractor should
coordinate with the appropriate utility or responsible party and verify
that electrical service has been safely disconnected, isolated, or
otherwise controlled before demolition activities expose electrical
components.
3. Which demolition method involves dismantling a structure
systematically from the top downward?
,A. Top-down demolition
B. Undercutting
C. Undermining
D. Controlled foundation release
Answer: A. Top-down demolition
Rationale: Top-down demolition removes a structure progressively
from its upper portions toward the lower levels. This method can
provide controlled sequencing and is commonly used where
surrounding buildings, streets, utilities, or other site constraints
require careful control of debris and structural stability.
4. What is the greatest concern when removing a load-bearing wall
prematurely?
A. Increased dust production
B. Loss of structural stability
C. Reduced lighting
D. Damage to hand tools
Answer: B. Loss of structural stability
Rationale: Load-bearing walls transfer structural loads. Removing one
without proper engineering, temporary shoring, or an appropriate
sequence can cause partial or complete structural collapse. Demolition
, must therefore follow an engineered or otherwise properly
established sequence.
5. Which item is most important when evaluating an adjacent
building before demolition?
A. Its exterior paint color
B. Its structural condition and proximity to the demolition area
C. The age of its landscaping
D. The number of windows it contains
Answer: B. Its structural condition and proximity to the demolition
area
Rationale: Adjacent structures can be affected by vibration, falling
debris, excavation, loss of lateral support, or changes in ground
conditions. Their condition and proximity should be evaluated so
appropriate protective measures can be established.
6. What is the purpose of temporary shoring during demolition?
A. To increase building occupancy
B. To provide temporary structural support while permanent structural
elements are removed
C. To reduce equipment fuel consumption
D. To improve the appearance of the structure
