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FDNY S-93 Certificate of Fitness EXAM LATEST
UPDATE THIS YEAR (2026-2027) ALL 300
QUESTIONS AND CORRECT ANSWERS WITH
RATIONALES
1. A flammable liquid is defined as a liquid with a flash point of:
A) Greater than 100°F
B) Less than 100°F (37.8°C)
C) Greater than 200°F
D) Exactly 140°F
Answer: B
Flammable liquids have a flash point below 100°F (37.8°C). Combustible liquids have a flash
point at or above 100°F. The flash point is the minimum temperature at which a liquid gives off
sufficient vapor to ignite in air.
2. A combustible liquid is defined as a liquid with a flash point of:
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A) Less than 100°F
B) At or above 100°F (37.8°C) and below 200°F (93.3°C)
C) Greater than 200°F
D) Exactly 140°F
Answer: B
Combustible liquids have a flash point at or above 100°F (37.8°C) and below 200°F (93.3°C).
Class IIIB liquids have flash points above 200°F and are also considered combustible but are
often regulated differently.
3. Which of the following is a Class IA flammable liquid?
A) Acetone
B) Ethyl ether
C) Diesel fuel
D) Kerosene
Answer: B
Class IA flammable liquids have flash points below 73°F (22.8°C) and boiling points below 100°F
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(37.8°C). Ethyl ether is a classic example. Acetone is Class IB. Diesel fuel and kerosene are
combustible liquids (Class II and IIIA).
4. The flash point of a liquid is defined as:
A) The temperature at which it boils
B) The temperature at which it ignites spontaneously
C) The minimum temperature at which it gives off enough vapor to ignite in air
D) The temperature at which it freezes
Answer: C
The flash point is the lowest temperature at which a liquid produces enough vapor to form an
ignitable mixture with air near its surface. It is the primary characteristic used to classify
flammable and combustible liquids.
5. A liquid with a flash point of 120°F would be classified as:
A) Class IA flammable liquid
B) Class IB flammable liquid
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C) Class II combustible liquid
D) Class IIIA combustible liquid
Answer: C
Class II combustible liquids have flash points at or above 100°F and below 140°F. A flash point of
120°F falls within this range. Class IIIA is 140-200°F. Class IA and IB are below 73°F (IA) or below
100°F (IB).
6. NFPA 704 is the standard for:
A) Fire extinguisher selection
B) The Hazardous Materials Identification System (HMIS) diamond
C) Fire sprinkler installation
D) Emergency evacuation procedures
Answer: B
NFPA 704 provides a standard system for the identification of the hazards of materials for
emergency response. The familiar "diamond" sign uses four colored quadrants to indicate
health, flammability, instability, and special hazards.
4
FDNY S-93 Certificate of Fitness EXAM LATEST
UPDATE THIS YEAR (2026-2027) ALL 300
QUESTIONS AND CORRECT ANSWERS WITH
RATIONALES
1. A flammable liquid is defined as a liquid with a flash point of:
A) Greater than 100°F
B) Less than 100°F (37.8°C)
C) Greater than 200°F
D) Exactly 140°F
Answer: B
Flammable liquids have a flash point below 100°F (37.8°C). Combustible liquids have a flash
point at or above 100°F. The flash point is the minimum temperature at which a liquid gives off
sufficient vapor to ignite in air.
2. A combustible liquid is defined as a liquid with a flash point of:
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A) Less than 100°F
B) At or above 100°F (37.8°C) and below 200°F (93.3°C)
C) Greater than 200°F
D) Exactly 140°F
Answer: B
Combustible liquids have a flash point at or above 100°F (37.8°C) and below 200°F (93.3°C).
Class IIIB liquids have flash points above 200°F and are also considered combustible but are
often regulated differently.
3. Which of the following is a Class IA flammable liquid?
A) Acetone
B) Ethyl ether
C) Diesel fuel
D) Kerosene
Answer: B
Class IA flammable liquids have flash points below 73°F (22.8°C) and boiling points below 100°F
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(37.8°C). Ethyl ether is a classic example. Acetone is Class IB. Diesel fuel and kerosene are
combustible liquids (Class II and IIIA).
4. The flash point of a liquid is defined as:
A) The temperature at which it boils
B) The temperature at which it ignites spontaneously
C) The minimum temperature at which it gives off enough vapor to ignite in air
D) The temperature at which it freezes
Answer: C
The flash point is the lowest temperature at which a liquid produces enough vapor to form an
ignitable mixture with air near its surface. It is the primary characteristic used to classify
flammable and combustible liquids.
5. A liquid with a flash point of 120°F would be classified as:
A) Class IA flammable liquid
B) Class IB flammable liquid
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C) Class II combustible liquid
D) Class IIIA combustible liquid
Answer: C
Class II combustible liquids have flash points at or above 100°F and below 140°F. A flash point of
120°F falls within this range. Class IIIA is 140-200°F. Class IA and IB are below 73°F (IA) or below
100°F (IB).
6. NFPA 704 is the standard for:
A) Fire extinguisher selection
B) The Hazardous Materials Identification System (HMIS) diamond
C) Fire sprinkler installation
D) Emergency evacuation procedures
Answer: B
NFPA 704 provides a standard system for the identification of the hazards of materials for
emergency response. The familiar "diamond" sign uses four colored quadrants to indicate
health, flammability, instability, and special hazards.
4
