CA C-21 Building Moving & Demolition
Contractor Exam Practice Questions
And Correct Answers (Verified Answers)
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1.Which activity is specifically included within the California C-21 Building
Moving/Demolition Contractor classification?
A. Installing permanent electrical systems in retained buildings
B. Raising, lowering, cribbing, underpinning, demolishing, moving, or
removing structures
C. Performing all architectural design services
D. Installing new plumbing systems in occupied buildings
B. Raising, lowering, cribbing, underpinning, demolishing, moving, or
removing structures
,The C-21 classification specifically covers raising, lowering, cribbing,
underpinning, demolishing, and moving or removing structures, including
their foundations.
2. A C-21 contractor is hired to demolish an entire detached structure,
including its foundation. Which statement best describes the scope of
the classification?
A. The classification covers only removal of interior finishes
B. The classification can encompass demolition and removal of the structure
and its foundation
C. The contractor may only remove landscaping
D. The contractor may only disconnect utilities
B. The classification can encompass demolition and removal of the
structure and its foundation
The C-21 classification expressly includes structures and their foundations
when performing covered building-moving or demolition work.
3. Which activity is specifically excluded from the C-21 classification
when the portion of the structure is permanently retained?
A. Demolition of a structure scheduled for complete removal
B. Raising a structure as part of a building-moving operation
C. Alterations, additions, repairs, or rehabilitation of permanently retained
,portions
D. Removal of a building foundation
C. Alterations, additions, repairs, or rehabilitation of permanently retained
portions
The C-21 classification does not include alterations, additions, repairs, or
rehabilitation of portions of structures that are permanently retained.
4. Before beginning demolition of an existing building, what is one of the
contractor's most important responsibilities?
A. Begin demolition immediately after arriving at the site
B. Assess the structure, identify hazards and utilities, and establish an
appropriate demolition sequence
C. Remove structural supports without planning
D. Allow workers to choose their own demolition sequence
B. Assess the structure, identify hazards and utilities, and establish an
appropriate demolition sequence
Demolition requires advance planning because uncontrolled structural
failure, utility hazards, hazardous materials, and unstable conditions can
create severe risks.
5. Why is a pre-demolition structural assessment important?
, A. It determines only the building's architectural style
B. It helps identify structural conditions, load paths, weakened areas, and
potential collapse hazards
C. It eliminates the need for worker training
D. It guarantees that no hazardous materials exist
B. It helps identify structural conditions, load paths, weakened areas, and
potential collapse hazards
Understanding the existing structure allows the contractor to develop a
controlled demolition sequence and recognize conditions that could cause
premature or unexpected collapse.
6. A building contains damaged structural members before demolition
begins. Why is this condition particularly important?
A. Damaged members can alter expected load paths and increase the risk of
premature collapse
B. Damaged members always make demolition easier
C. Structural damage has no effect on demolition planning
D. Damaged members eliminate the need for temporary support
A. Damaged members can alter expected load paths and increase the risk
of premature collapse
Contractor Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2027 Q&A| Instant
Download Pdf.
1.Which activity is specifically included within the California C-21 Building
Moving/Demolition Contractor classification?
A. Installing permanent electrical systems in retained buildings
B. Raising, lowering, cribbing, underpinning, demolishing, moving, or
removing structures
C. Performing all architectural design services
D. Installing new plumbing systems in occupied buildings
B. Raising, lowering, cribbing, underpinning, demolishing, moving, or
removing structures
,The C-21 classification specifically covers raising, lowering, cribbing,
underpinning, demolishing, and moving or removing structures, including
their foundations.
2. A C-21 contractor is hired to demolish an entire detached structure,
including its foundation. Which statement best describes the scope of
the classification?
A. The classification covers only removal of interior finishes
B. The classification can encompass demolition and removal of the structure
and its foundation
C. The contractor may only remove landscaping
D. The contractor may only disconnect utilities
B. The classification can encompass demolition and removal of the
structure and its foundation
The C-21 classification expressly includes structures and their foundations
when performing covered building-moving or demolition work.
3. Which activity is specifically excluded from the C-21 classification
when the portion of the structure is permanently retained?
A. Demolition of a structure scheduled for complete removal
B. Raising a structure as part of a building-moving operation
C. Alterations, additions, repairs, or rehabilitation of permanently retained
,portions
D. Removal of a building foundation
C. Alterations, additions, repairs, or rehabilitation of permanently retained
portions
The C-21 classification does not include alterations, additions, repairs, or
rehabilitation of portions of structures that are permanently retained.
4. Before beginning demolition of an existing building, what is one of the
contractor's most important responsibilities?
A. Begin demolition immediately after arriving at the site
B. Assess the structure, identify hazards and utilities, and establish an
appropriate demolition sequence
C. Remove structural supports without planning
D. Allow workers to choose their own demolition sequence
B. Assess the structure, identify hazards and utilities, and establish an
appropriate demolition sequence
Demolition requires advance planning because uncontrolled structural
failure, utility hazards, hazardous materials, and unstable conditions can
create severe risks.
5. Why is a pre-demolition structural assessment important?
, A. It determines only the building's architectural style
B. It helps identify structural conditions, load paths, weakened areas, and
potential collapse hazards
C. It eliminates the need for worker training
D. It guarantees that no hazardous materials exist
B. It helps identify structural conditions, load paths, weakened areas, and
potential collapse hazards
Understanding the existing structure allows the contractor to develop a
controlled demolition sequence and recognize conditions that could cause
premature or unexpected collapse.
6. A building contains damaged structural members before demolition
begins. Why is this condition particularly important?
A. Damaged members can alter expected load paths and increase the risk of
premature collapse
B. Damaged members always make demolition easier
C. Structural damage has no effect on demolition planning
D. Damaged members eliminate the need for temporary support
A. Damaged members can alter expected load paths and increase the risk
of premature collapse
