Asbestos Contractor/Supervisor License Exam
1 Questions And Correct Answers (Verified
Answers) Plus Rationales 2025
1. What is the primary purpose of an asbestos containment system on a
demolition or renovation site?
A) To allow free airflow
B) To prevent asbestos fibers from escaping into the environment
C) To improve worker comfort
D) To increase work speed
Answer: B) To prevent asbestos fibers from escaping into the environment
Rationale: Containment systems are designed to isolate the asbestos work area
and prevent fibers from contaminating surrounding areas, protecting workers and
the public.
2. What type of respirator is most commonly required for workers involved in
asbestos removal?
A) N95 filtering facepiece
B) Half-face elastomeric with P100 cartridges
C) SCBA (Self-Contained Breathing Apparatus)
D) Dust mask
,Answer: B) Half-face elastomeric with P100 cartridges
Rationale: P100 filters provide the highest level of filtration efficiency (99.97%)
against asbestos fibers, which are very small and hazardous.
3. Before beginning asbestos abatement work, a supervisor must ensure that:
A) All workers have taken an asbestos awareness course
B) Air monitoring equipment is calibrated
C) A work plan and proper training are in place
D) All adjacent buildings are evacuated
Answer: C) A work plan and proper training are in place
Rationale: Proper training and a detailed work plan are essential for safe and
compliant asbestos removal operations.
4. What is the minimum clearance air sample concentration allowed (in fibers
per cubic centimeter) for reoccupancy after asbestos abatement?
A) 0.1 f/cc
B) 0.01 f/cc
C) 0.05 f/cc
D) 1.0 f/cc
Answer: B) 0.01 f/cc
Rationale: The OSHA clearance level for asbestos in air after abatement is 0.01
fibers per cubic centimeter (f/cc).
, 5. Which asbestos type is considered the most hazardous?
A) Chrysotile
B) Amosite
C) Crocidolite
D) Tremolite
Answer: C) Crocidolite
Rationale: Crocidolite (blue asbestos) is the most hazardous due to its needle-like
fibers and high durability in lung tissue.
6. What is the purpose of wetting asbestos-containing material during removal?
A) To reduce fiber release
B) To make the material easier to remove
C) To prevent fire hazards
D) To improve visual inspection
Answer: A) To reduce fiber release
Rationale: Wetting asbestos-containing material suppresses dust and fibers,
minimizing airborne fiber release.
7. When disposing of asbestos waste, it must be:
A) Double-bagged in 6-mil plastic bags and labeled
B) Disposed of as regular construction debris
C) Burned on-site
D) Thrown into dumpsters without labeling
1 Questions And Correct Answers (Verified
Answers) Plus Rationales 2025
1. What is the primary purpose of an asbestos containment system on a
demolition or renovation site?
A) To allow free airflow
B) To prevent asbestos fibers from escaping into the environment
C) To improve worker comfort
D) To increase work speed
Answer: B) To prevent asbestos fibers from escaping into the environment
Rationale: Containment systems are designed to isolate the asbestos work area
and prevent fibers from contaminating surrounding areas, protecting workers and
the public.
2. What type of respirator is most commonly required for workers involved in
asbestos removal?
A) N95 filtering facepiece
B) Half-face elastomeric with P100 cartridges
C) SCBA (Self-Contained Breathing Apparatus)
D) Dust mask
,Answer: B) Half-face elastomeric with P100 cartridges
Rationale: P100 filters provide the highest level of filtration efficiency (99.97%)
against asbestos fibers, which are very small and hazardous.
3. Before beginning asbestos abatement work, a supervisor must ensure that:
A) All workers have taken an asbestos awareness course
B) Air monitoring equipment is calibrated
C) A work plan and proper training are in place
D) All adjacent buildings are evacuated
Answer: C) A work plan and proper training are in place
Rationale: Proper training and a detailed work plan are essential for safe and
compliant asbestos removal operations.
4. What is the minimum clearance air sample concentration allowed (in fibers
per cubic centimeter) for reoccupancy after asbestos abatement?
A) 0.1 f/cc
B) 0.01 f/cc
C) 0.05 f/cc
D) 1.0 f/cc
Answer: B) 0.01 f/cc
Rationale: The OSHA clearance level for asbestos in air after abatement is 0.01
fibers per cubic centimeter (f/cc).
, 5. Which asbestos type is considered the most hazardous?
A) Chrysotile
B) Amosite
C) Crocidolite
D) Tremolite
Answer: C) Crocidolite
Rationale: Crocidolite (blue asbestos) is the most hazardous due to its needle-like
fibers and high durability in lung tissue.
6. What is the purpose of wetting asbestos-containing material during removal?
A) To reduce fiber release
B) To make the material easier to remove
C) To prevent fire hazards
D) To improve visual inspection
Answer: A) To reduce fiber release
Rationale: Wetting asbestos-containing material suppresses dust and fibers,
minimizing airborne fiber release.
7. When disposing of asbestos waste, it must be:
A) Double-bagged in 6-mil plastic bags and labeled
B) Disposed of as regular construction debris
C) Burned on-site
D) Thrown into dumpsters without labeling
