FDNY C91 Supervision of Storage, Handling
and Use of Hazardous Materials Practice
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which of the following is the primary federal agency responsible for
regulating hazardous materials transportation?
A) EPA
B) OSHA
C) DOT
D) NFPA
Rationale: The Department of Transportation (DOT) sets regulations
for the safe transport of hazardous materials under 49 CFR.
2. What is the primary hazard class for flammable liquids according to
DOT regulations?
A) Class 1
, B) Class 3
C) Class 4
D) Class 5
Rationale: DOT Class 3 includes flammable and combustible liquids,
such as gasoline and acetone.
3. Under NFPA 704, what does a red diamond indicate?
A) Health hazard
B) Reactivity hazard
C) Flammability hazard
D) Special hazard
Rationale: In the NFPA 704 “fire diamond,” red represents
flammability, blue represents health, yellow represents instability,
and white represents special hazards.
4. The OSHA Hazard Communication Standard requires employers to
maintain:
A) Safety Data Sheets (SDS) for all hazardous chemicals
B) Fire extinguishers in all areas
C) Personal hygiene facilities only for flammable materials
D) Monthly chemical inventories
Rationale: OSHA 29 CFR 1910.1200 requires that SDSs be available to
employees for all hazardous chemicals.
5. Which storage practice is most important for oxidizers?
A) Store with flammables
, B) Store separately from flammables and combustibles
C) Store near heat sources
D) Store in airtight metal containers only
Rationale: Oxidizers can intensify fires; therefore, they must be
stored separately from flammable and combustible materials.
6. What is the maximum quantity of Class I flammable liquids allowed in
a control area without a special permit, according to NFPA 30?
A) 10 gallons
B) 25 gallons
C) 55 gallons
D) 100 gallons
Rationale: NFPA 30 sets limits on the quantity of flammable liquids
that can be stored in areas without special permitting; for Class I
liquids, 25 gallons is typically the threshold.
7. What type of fire extinguisher is suitable for electrical fires?
A) Water
B) Foam
C) CO₂
D) Wet chemical
Rationale: CO₂ extinguishers are non-conductive and suitable for
electrical fires.
8. What is the main health hazard associated with hydrogen sulfide
exposure?
, A) Burns
B) Respiratory paralysis
C) Skin irritation only
D) Eye dryness
Rationale: Hydrogen sulfide is highly toxic and can cause respiratory
paralysis or death at high concentrations.
9. Which NFPA standard covers the storage and handling of flammable
and combustible liquids?
A) NFPA 10
B) NFPA 704
C) NFPA 30
D) NFPA 400
Rationale: NFPA 30 specifically addresses storage, handling, and use
of flammable and combustible liquids.
10. When labeling hazardous materials, the DOT requires:
A) Only chemical name
B) Only manufacturer information
C) Proper shipping name, hazard class, and identification number
D) No labeling is required if SDS is available
Rationale: DOT labeling regulations require the proper shipping
name, hazard class, and UN identification number on packages
containing hazardous materials.
and Use of Hazardous Materials Practice
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which of the following is the primary federal agency responsible for
regulating hazardous materials transportation?
A) EPA
B) OSHA
C) DOT
D) NFPA
Rationale: The Department of Transportation (DOT) sets regulations
for the safe transport of hazardous materials under 49 CFR.
2. What is the primary hazard class for flammable liquids according to
DOT regulations?
A) Class 1
, B) Class 3
C) Class 4
D) Class 5
Rationale: DOT Class 3 includes flammable and combustible liquids,
such as gasoline and acetone.
3. Under NFPA 704, what does a red diamond indicate?
A) Health hazard
B) Reactivity hazard
C) Flammability hazard
D) Special hazard
Rationale: In the NFPA 704 “fire diamond,” red represents
flammability, blue represents health, yellow represents instability,
and white represents special hazards.
4. The OSHA Hazard Communication Standard requires employers to
maintain:
A) Safety Data Sheets (SDS) for all hazardous chemicals
B) Fire extinguishers in all areas
C) Personal hygiene facilities only for flammable materials
D) Monthly chemical inventories
Rationale: OSHA 29 CFR 1910.1200 requires that SDSs be available to
employees for all hazardous chemicals.
5. Which storage practice is most important for oxidizers?
A) Store with flammables
, B) Store separately from flammables and combustibles
C) Store near heat sources
D) Store in airtight metal containers only
Rationale: Oxidizers can intensify fires; therefore, they must be
stored separately from flammable and combustible materials.
6. What is the maximum quantity of Class I flammable liquids allowed in
a control area without a special permit, according to NFPA 30?
A) 10 gallons
B) 25 gallons
C) 55 gallons
D) 100 gallons
Rationale: NFPA 30 sets limits on the quantity of flammable liquids
that can be stored in areas without special permitting; for Class I
liquids, 25 gallons is typically the threshold.
7. What type of fire extinguisher is suitable for electrical fires?
A) Water
B) Foam
C) CO₂
D) Wet chemical
Rationale: CO₂ extinguishers are non-conductive and suitable for
electrical fires.
8. What is the main health hazard associated with hydrogen sulfide
exposure?
, A) Burns
B) Respiratory paralysis
C) Skin irritation only
D) Eye dryness
Rationale: Hydrogen sulfide is highly toxic and can cause respiratory
paralysis or death at high concentrations.
9. Which NFPA standard covers the storage and handling of flammable
and combustible liquids?
A) NFPA 10
B) NFPA 704
C) NFPA 30
D) NFPA 400
Rationale: NFPA 30 specifically addresses storage, handling, and use
of flammable and combustible liquids.
10. When labeling hazardous materials, the DOT requires:
A) Only chemical name
B) Only manufacturer information
C) Proper shipping name, hazard class, and identification number
D) No labeling is required if SDS is available
Rationale: DOT labeling regulations require the proper shipping
name, hazard class, and UN identification number on packages
containing hazardous materials.
