Iowa Demolition Contractor
Qualification Advanced 100-Question
Practice Exam 2026 | Questions &
Answers with Detailed Rationales |
Complete Exam Prep & Study Guide
1. Before beginning demolition of a commercial structure, what is the most
important initial step concerning utilities?
A. Remove all interior finishes
B. Begin structural weakening
C. Verify that all utilities have been identified, disconnected, isolated, and made
safe
D. Remove exterior doors
Answer: Verify that all utilities have been identified, disconnected, isolated, and
made safe
Rationale: Utilities such as electricity, gas, water, steam, and communication
services can create serious hazards during demolition. Isolation must be verified
before destructive work begins.
, 2. Which demolition method generally provides the greatest control when
removing a structure adjacent to an occupied building?
A. Uncontrolled implosion
B. Manual or mechanically controlled dismantling
C. Burning
D. Unplanned collapse
Answer: Manual or mechanically controlled dismantling
Rationale: Controlled dismantling allows the contractor to sequence removal,
limit vibration, and better protect adjacent structures and occupants.
3. During demolition, a partially demolished wall becomes unstable. What
should the contractor do first?
A. Increase equipment speed
B. Continue work from the opposite side
C. Stop work and establish or reinforce the required stability and exclusion
controls
D. Have workers push the wall down manually
Answer: Stop work and establish or reinforce the required stability and
exclusion controls
Rationale: Unstable structural elements can collapse unexpectedly. Work must
stop until the hazard is controlled.
4. What is the primary purpose of a pre-demolition engineering survey?
A. Determine the resale value of materials
B. Estimate employee productivity
C. Identify structural conditions, hazards, and potential methods of controlled
demolition
D. Determine equipment fuel consumption
Answer: Identify structural conditions, hazards, and potential methods of
controlled demolition
,Rationale: The survey provides critical information about construction,
structural integrity, modifications, hazardous materials, and conditions affecting
the demolition sequence.
5. Why can removing lower structural members prematurely be especially
dangerous?
A. It increases dust generation only
B. It reduces lighting
C. It may remove the load path and cause an uncontrolled partial or total
collapse
D. It makes material recycling difficult
Answer: It may remove the load path and cause an uncontrolled partial or total
collapse
Rationale: Structural components interact as a system. Removing a critical
member without adequate sequencing or temporary support can destabilize the
entire structure.
6. What is the safest general approach to a load-bearing wall that must be
removed while portions of the building remain occupied or supported by it?
A. Remove it rapidly with a machine
B. Cut it at several locations simultaneously
C. Provide an engineered temporary support system before removing the load-
bearing element
D. Remove only the bottom portion
Answer: Provide an engineered temporary support system before removing the
load-bearing element
Rationale: Temporary shoring transfers loads safely while permanent structural
elements are removed or modified.
7. Which condition should cause a demolition contractor to stop work
immediately?
, A. Normal concrete dust
B. Moderate equipment noise
C. An unexpected structural movement indicating potential collapse
D. A full debris container
Answer: An unexpected structural movement indicating potential collapse
Rationale: Unexpected movement can indicate loss of structural stability and
requires immediate evaluation and control.
8. What is the primary purpose of establishing a demolition exclusion zone?
A. Improve equipment appearance
B. Reduce material costs
C. Keep unauthorized personnel away from falling debris, equipment, and other
demolition hazards
D. Increase worker access
Answer: Keep unauthorized personnel away from falling debris, equipment, and
other demolition hazards
Rationale: Demolition creates falling-object, collapse, equipment, and struck-by
hazards. Restricted areas reduce exposure.
9. Which demolition technique is generally most appropriate when a structure
contains significant quantities of reusable materials?
A. Uncontrolled collapse
B. Selective dismantling
C. Burning
D. Explosive demolition
Answer: Selective dismantling
Rationale: Selective dismantling permits materials such as structural steel,
fixtures, doors, and equipment to be removed intact for reuse or recycling.
Qualification Advanced 100-Question
Practice Exam 2026 | Questions &
Answers with Detailed Rationales |
Complete Exam Prep & Study Guide
1. Before beginning demolition of a commercial structure, what is the most
important initial step concerning utilities?
A. Remove all interior finishes
B. Begin structural weakening
C. Verify that all utilities have been identified, disconnected, isolated, and made
safe
D. Remove exterior doors
Answer: Verify that all utilities have been identified, disconnected, isolated, and
made safe
Rationale: Utilities such as electricity, gas, water, steam, and communication
services can create serious hazards during demolition. Isolation must be verified
before destructive work begins.
, 2. Which demolition method generally provides the greatest control when
removing a structure adjacent to an occupied building?
A. Uncontrolled implosion
B. Manual or mechanically controlled dismantling
C. Burning
D. Unplanned collapse
Answer: Manual or mechanically controlled dismantling
Rationale: Controlled dismantling allows the contractor to sequence removal,
limit vibration, and better protect adjacent structures and occupants.
3. During demolition, a partially demolished wall becomes unstable. What
should the contractor do first?
A. Increase equipment speed
B. Continue work from the opposite side
C. Stop work and establish or reinforce the required stability and exclusion
controls
D. Have workers push the wall down manually
Answer: Stop work and establish or reinforce the required stability and
exclusion controls
Rationale: Unstable structural elements can collapse unexpectedly. Work must
stop until the hazard is controlled.
4. What is the primary purpose of a pre-demolition engineering survey?
A. Determine the resale value of materials
B. Estimate employee productivity
C. Identify structural conditions, hazards, and potential methods of controlled
demolition
D. Determine equipment fuel consumption
Answer: Identify structural conditions, hazards, and potential methods of
controlled demolition
,Rationale: The survey provides critical information about construction,
structural integrity, modifications, hazardous materials, and conditions affecting
the demolition sequence.
5. Why can removing lower structural members prematurely be especially
dangerous?
A. It increases dust generation only
B. It reduces lighting
C. It may remove the load path and cause an uncontrolled partial or total
collapse
D. It makes material recycling difficult
Answer: It may remove the load path and cause an uncontrolled partial or total
collapse
Rationale: Structural components interact as a system. Removing a critical
member without adequate sequencing or temporary support can destabilize the
entire structure.
6. What is the safest general approach to a load-bearing wall that must be
removed while portions of the building remain occupied or supported by it?
A. Remove it rapidly with a machine
B. Cut it at several locations simultaneously
C. Provide an engineered temporary support system before removing the load-
bearing element
D. Remove only the bottom portion
Answer: Provide an engineered temporary support system before removing the
load-bearing element
Rationale: Temporary shoring transfers loads safely while permanent structural
elements are removed or modified.
7. Which condition should cause a demolition contractor to stop work
immediately?
, A. Normal concrete dust
B. Moderate equipment noise
C. An unexpected structural movement indicating potential collapse
D. A full debris container
Answer: An unexpected structural movement indicating potential collapse
Rationale: Unexpected movement can indicate loss of structural stability and
requires immediate evaluation and control.
8. What is the primary purpose of establishing a demolition exclusion zone?
A. Improve equipment appearance
B. Reduce material costs
C. Keep unauthorized personnel away from falling debris, equipment, and other
demolition hazards
D. Increase worker access
Answer: Keep unauthorized personnel away from falling debris, equipment, and
other demolition hazards
Rationale: Demolition creates falling-object, collapse, equipment, and struck-by
hazards. Restricted areas reduce exposure.
9. Which demolition technique is generally most appropriate when a structure
contains significant quantities of reusable materials?
A. Uncontrolled collapse
B. Selective dismantling
C. Burning
D. Explosive demolition
Answer: Selective dismantling
Rationale: Selective dismantling permits materials such as structural steel,
fixtures, doors, and equipment to be removed intact for reuse or recycling.
