FDNY C91 Supervision of Storage, Handling
and Use of Hazardous Materials Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which of the following is considered a hazardous material under FDNY
regulations?
A. Bottled water
B. Office paper
C. Acetone
D. Wood planks
Rationale: Acetone is classified as a hazardous material due to its
flammability and potential health effects.
2. What is the primary purpose of a Safety Data Sheet (SDS)?
A. To provide marketing information
B. To list the product price
, C. To provide detailed hazard and handling information
D. To replace OSHA regulations
Rationale: SDS provide essential information on the chemical
properties, hazards, protective measures, and emergency
procedures.
3. In a storage facility, incompatible chemicals must be:
A. Stored together to save space
B. Separated to prevent reactions
C. Labeled with the same color
D. Placed on the same shelf
Rationale: Storing incompatible chemicals together can lead to fires,
explosions, or toxic reactions.
4. Which fire extinguisher is appropriate for flammable liquids?
A. Water
B. Foam
C. Carbon dioxide (CO₂)
D. Wet chemical
Rationale: CO₂ extinguishers remove oxygen and cool the fire
without leaving residue, suitable for flammable liquids.
5. The NFPA 704 diamond provides information on:
A. Storage capacity
B. Hazard classification
C. Shipping instructions
, D. Pricing
Rationale: The NFPA diamond indicates health, flammability,
reactivity hazards, and special precautions.
6. What is the minimum distance between oxidizers and flammable
liquids in storage?
A. 5 feet
B. 10 feet
C. 20 feet
D. 50 feet
Rationale: Adequate separation prevents reactions that could result
in fire or explosion.
7. When labeling a chemical container, which information is required?
A. Supplier’s website
B. Chemical name and hazard warnings
C. Purchase price
D. Storage location only
Rationale: Accurate labeling ensures safe handling and emergency
response.
8. Which type of ventilation is most effective for removing toxic vapors
from a lab?
A. Window fan
B. Fume hood
C. Ceiling fan
, D. Portable air conditioner
Rationale: Fume hoods capture and exhaust hazardous vapors
directly from the source.
9. Personal protective equipment (PPE) selection should be based on:
A. Cost
B. Type of chemical and exposure risk
C. Color preference
D. Manufacturer’s brand
Rationale: PPE must match the hazards present, such as gloves,
goggles, or respirators.
10. Which of the following is a common oxidizer?
A. Gasoline
B. Ammonium nitrate
C. Kerosene
D. Ethanol
Rationale: Ammonium nitrate can cause or enhance the combustion
of other materials.
11. What is the correct action if a chemical spill occurs?
A. Ignore it
B. Evacuate and follow spill response procedures
C. Pour water on it always
D. Sweep it into the trash
and Use of Hazardous Materials Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which of the following is considered a hazardous material under FDNY
regulations?
A. Bottled water
B. Office paper
C. Acetone
D. Wood planks
Rationale: Acetone is classified as a hazardous material due to its
flammability and potential health effects.
2. What is the primary purpose of a Safety Data Sheet (SDS)?
A. To provide marketing information
B. To list the product price
, C. To provide detailed hazard and handling information
D. To replace OSHA regulations
Rationale: SDS provide essential information on the chemical
properties, hazards, protective measures, and emergency
procedures.
3. In a storage facility, incompatible chemicals must be:
A. Stored together to save space
B. Separated to prevent reactions
C. Labeled with the same color
D. Placed on the same shelf
Rationale: Storing incompatible chemicals together can lead to fires,
explosions, or toxic reactions.
4. Which fire extinguisher is appropriate for flammable liquids?
A. Water
B. Foam
C. Carbon dioxide (CO₂)
D. Wet chemical
Rationale: CO₂ extinguishers remove oxygen and cool the fire
without leaving residue, suitable for flammable liquids.
5. The NFPA 704 diamond provides information on:
A. Storage capacity
B. Hazard classification
C. Shipping instructions
, D. Pricing
Rationale: The NFPA diamond indicates health, flammability,
reactivity hazards, and special precautions.
6. What is the minimum distance between oxidizers and flammable
liquids in storage?
A. 5 feet
B. 10 feet
C. 20 feet
D. 50 feet
Rationale: Adequate separation prevents reactions that could result
in fire or explosion.
7. When labeling a chemical container, which information is required?
A. Supplier’s website
B. Chemical name and hazard warnings
C. Purchase price
D. Storage location only
Rationale: Accurate labeling ensures safe handling and emergency
response.
8. Which type of ventilation is most effective for removing toxic vapors
from a lab?
A. Window fan
B. Fume hood
C. Ceiling fan
, D. Portable air conditioner
Rationale: Fume hoods capture and exhaust hazardous vapors
directly from the source.
9. Personal protective equipment (PPE) selection should be based on:
A. Cost
B. Type of chemical and exposure risk
C. Color preference
D. Manufacturer’s brand
Rationale: PPE must match the hazards present, such as gloves,
goggles, or respirators.
10. Which of the following is a common oxidizer?
A. Gasoline
B. Ammonium nitrate
C. Kerosene
D. Ethanol
Rationale: Ammonium nitrate can cause or enhance the combustion
of other materials.
11. What is the correct action if a chemical spill occurs?
A. Ignore it
B. Evacuate and follow spill response procedures
C. Pour water on it always
D. Sweep it into the trash
