Page 1 of 116
FDNY W42 Supervision of Handling and Use of
Corrosives and Oxidizers Exam (Citywide)
ACTUAL QUESTIONS AND ANSWERS LATEST
UPDATE THIS YEAR
FDNY W42 Supervision of Handling and Use of Corrosives and Oxidizers Practice Exam (Citywide) with
questions, answers, and rationales based on FDNY Fire Code Chapters 27 and 50, NFPA standards, and
NYC regulations.
1. What is the primary purpose of the W42 Certificate of Fitness?
A) To allow the handling of flammable gases
B) To supervise the safe handling and use of corrosive and oxidizing materials
C) To supervise the use of explosives
D) To inspect electrical systems
Answer: B
Rationale: The W42 certificate ensures a qualified person supervises the use and handling of corrosive
and oxidizing chemicals to prevent fire, explosion, and injury.
, Page 2 of 116
2. Which FDNY document primarily governs the handling of oxidizers and corrosives in New York City?
A) NYC Building Code
B) FDNY Fire Code (FC Chapter 27 and 50)
C) NYC Plumbing Code
D) OSHA 1910 Subpart H
Answer: B
Rationale: FDNY Fire Code Chapters 27 and 50 specifically regulate hazardous materials, including
oxidizers and corrosives, in New York City.
3. According to FDNY regulations, which document must be available on-site for every corrosive or
oxidizer container?
A) DOT Shipping Manifest
B) Safety Data Sheet (SDS)
C) Vendor Purchase Order
D) Transporter Certification
Answer: B
, Page 3 of 116
Rationale: SDS sheets are required for all hazardous materials to provide hazard, handling, and
emergency information.
4. Corrosive liquids are primarily defined by their ability to:
A) React with nitrogen
B) Burn when exposed to flame
C) Destroy living tissue or metal through chemical action
D) Produce flammable vapors
Answer: C
Rationale: Corrosives cause destruction of materials or tissue upon contact through chemical action.
5. Oxidizers are hazardous primarily because they:
A) Freeze rapidly
B) Neutralize acids
C) Support or accelerate combustion
D) Become inert when heated
Answer: C
, Page 4 of 116
Rationale: Oxidizers release oxygen or similar agents, increasing fire intensity and supporting
combustion.
6. The W42 Certificate of Fitness holder must be present:
A) Only during shipping
B) Only during storage
C) During handling, dispensing, and use of corrosives or oxidizers
D) Only during emergencies
Answer: C
Rationale: FDNY requires supervision during all active operations involving these materials.
7. Under the W42 scope, this certificate is:
A) Valid only at a single specific location
B) Citywide, valid for any location within NYC
C) Valid only in Manhattan
D) Valid only for the employer who sponsored the application
Answer: B
FDNY W42 Supervision of Handling and Use of
Corrosives and Oxidizers Exam (Citywide)
ACTUAL QUESTIONS AND ANSWERS LATEST
UPDATE THIS YEAR
FDNY W42 Supervision of Handling and Use of Corrosives and Oxidizers Practice Exam (Citywide) with
questions, answers, and rationales based on FDNY Fire Code Chapters 27 and 50, NFPA standards, and
NYC regulations.
1. What is the primary purpose of the W42 Certificate of Fitness?
A) To allow the handling of flammable gases
B) To supervise the safe handling and use of corrosive and oxidizing materials
C) To supervise the use of explosives
D) To inspect electrical systems
Answer: B
Rationale: The W42 certificate ensures a qualified person supervises the use and handling of corrosive
and oxidizing chemicals to prevent fire, explosion, and injury.
, Page 2 of 116
2. Which FDNY document primarily governs the handling of oxidizers and corrosives in New York City?
A) NYC Building Code
B) FDNY Fire Code (FC Chapter 27 and 50)
C) NYC Plumbing Code
D) OSHA 1910 Subpart H
Answer: B
Rationale: FDNY Fire Code Chapters 27 and 50 specifically regulate hazardous materials, including
oxidizers and corrosives, in New York City.
3. According to FDNY regulations, which document must be available on-site for every corrosive or
oxidizer container?
A) DOT Shipping Manifest
B) Safety Data Sheet (SDS)
C) Vendor Purchase Order
D) Transporter Certification
Answer: B
, Page 3 of 116
Rationale: SDS sheets are required for all hazardous materials to provide hazard, handling, and
emergency information.
4. Corrosive liquids are primarily defined by their ability to:
A) React with nitrogen
B) Burn when exposed to flame
C) Destroy living tissue or metal through chemical action
D) Produce flammable vapors
Answer: C
Rationale: Corrosives cause destruction of materials or tissue upon contact through chemical action.
5. Oxidizers are hazardous primarily because they:
A) Freeze rapidly
B) Neutralize acids
C) Support or accelerate combustion
D) Become inert when heated
Answer: C
, Page 4 of 116
Rationale: Oxidizers release oxygen or similar agents, increasing fire intensity and supporting
combustion.
6. The W42 Certificate of Fitness holder must be present:
A) Only during shipping
B) Only during storage
C) During handling, dispensing, and use of corrosives or oxidizers
D) Only during emergencies
Answer: C
Rationale: FDNY requires supervision during all active operations involving these materials.
7. Under the W42 scope, this certificate is:
A) Valid only at a single specific location
B) Citywide, valid for any location within NYC
C) Valid only in Manhattan
D) Valid only for the employer who sponsored the application
Answer: B
