NFPA 10 Final Exam – Actual Exam –
Complete 200 Questions with Detailed
Verified Answers – A+ Graded – 2025/2026
Edition.
Reference: NFPA 10 Standard for Portable Fire Extinguishers, 2022 Edition (Applicable for
2025/2026 Cycle).
Domain 1: Fire Classification & Extinguisher Selection (40 Questions)
1. Which of the following fuels is characteristic of a Class A fire?
A. Gasoline
B. Flammable gases
C. Wood and paper
D. Combustible metals
[CORRECT] C. Wood and paper
Rationale: Per NFPA 10, Class A fires involve ordinary combustibles such as wood, cloth,
paper, rubber, and many plastics.
2. A fire involving energized electrical equipment is classified as which class?
A. Class A
B. Class B
C. Class C
D. Class K
[CORRECT] C. Class C
Rationale: Class C fires involve energized electrical equipment, such as appliances, switches,
panel boxes, and power tools.
,3. Which extinguishing agent is specifically designed for Class K fires involving cooking oils and
fats?
A. Dry Chemical
B. Carbon Dioxide
C. Wet Chemical
D. Halon
[CORRECT] C. Wet Chemical
Rationale: Wet chemical agents are specifically formulated for Class K fires by saponifying the
cooking media to form a foam layer that suppresses vapor and cools the fire.
4. Lithium, magnesium, and sodium are fuels associated with which fire classification?
A. Class D
B. Class B
C. Class C
D. Class A
[CORRECT] A. Class D
Rationale: Class D fires involve combustible metals such as magnesium, titanium, zirconium,
sodium, lithium, and potassium.
5. Class B fires are best described as involving:
A. Ordinary combustibles
B. Flammable or combustible liquids and gases
C. Electrical equipment
D. Cooking oils
[CORRECT] B. Flammable or combustible liquids and gases
Rationale: NFPA 10 defines Class B fires as those involving flammable or combustible liquids,
flammable gases, greases, and similar materials.
,6. Which fire class requires an extinguishing agent that does not leave a conductive residue?
A. Class A
B. Class C
C. Class D
D. Class K
[CORRECT] B. Class C
Rationale: Extinguishers for Class C fires must use non-conductive agents (like CO2 or clean
agents) to prevent the operator from receiving an electric shock.
7. Trash and paper waste in an office environment constitute which fire class?
A. Class A
B. Class B
C. Class C
D. Class D
[CORRECT] A. Class A
Rationale: Common office waste like paper and trash is categorized as ordinary combustibles
(Class A).
8. A fire in a commercial deep-fat fryer is a:
A. Class K fire
B. Class B fire
C. Class D fire
D. Class A fire
[CORRECT] A. Class K fire
, Rationale: While cooking oils are technically flammable liquids, NFPA 10 specifically classifies
fires involving commercial cooking appliances as Class K due to the high-heat properties of
vegetable/animal oils.
9. Which of the following is NOT considered a Class A fuel?
A. Rubber
B. Plastic
C. Acetylene
D. Wood
[CORRECT] C. Acetylene
Rationale: Acetylene is a flammable gas, falling under Class B classification. Rubber, certain
plastics, and wood are Class A.
10. Which extinguishing agent is generally considered incompatible with Class D combustible
metal fires?
A. Dry Powder (specifically for Class D)
B. Water
C. Argon
D. Graphite based agents
[CORRECT] B. Water
Rationale: Water can react violently with many combustible metals, exacerbating the fire or
causing explosions.专用 Class D agents are required.
11. Can a multi-purpose ABC dry chemical extinguisher be used on a Class C fire?
A. Yes
B. No
C. Only if the equipment is de-energized first
Complete 200 Questions with Detailed
Verified Answers – A+ Graded – 2025/2026
Edition.
Reference: NFPA 10 Standard for Portable Fire Extinguishers, 2022 Edition (Applicable for
2025/2026 Cycle).
Domain 1: Fire Classification & Extinguisher Selection (40 Questions)
1. Which of the following fuels is characteristic of a Class A fire?
A. Gasoline
B. Flammable gases
C. Wood and paper
D. Combustible metals
[CORRECT] C. Wood and paper
Rationale: Per NFPA 10, Class A fires involve ordinary combustibles such as wood, cloth,
paper, rubber, and many plastics.
2. A fire involving energized electrical equipment is classified as which class?
A. Class A
B. Class B
C. Class C
D. Class K
[CORRECT] C. Class C
Rationale: Class C fires involve energized electrical equipment, such as appliances, switches,
panel boxes, and power tools.
,3. Which extinguishing agent is specifically designed for Class K fires involving cooking oils and
fats?
A. Dry Chemical
B. Carbon Dioxide
C. Wet Chemical
D. Halon
[CORRECT] C. Wet Chemical
Rationale: Wet chemical agents are specifically formulated for Class K fires by saponifying the
cooking media to form a foam layer that suppresses vapor and cools the fire.
4. Lithium, magnesium, and sodium are fuels associated with which fire classification?
A. Class D
B. Class B
C. Class C
D. Class A
[CORRECT] A. Class D
Rationale: Class D fires involve combustible metals such as magnesium, titanium, zirconium,
sodium, lithium, and potassium.
5. Class B fires are best described as involving:
A. Ordinary combustibles
B. Flammable or combustible liquids and gases
C. Electrical equipment
D. Cooking oils
[CORRECT] B. Flammable or combustible liquids and gases
Rationale: NFPA 10 defines Class B fires as those involving flammable or combustible liquids,
flammable gases, greases, and similar materials.
,6. Which fire class requires an extinguishing agent that does not leave a conductive residue?
A. Class A
B. Class C
C. Class D
D. Class K
[CORRECT] B. Class C
Rationale: Extinguishers for Class C fires must use non-conductive agents (like CO2 or clean
agents) to prevent the operator from receiving an electric shock.
7. Trash and paper waste in an office environment constitute which fire class?
A. Class A
B. Class B
C. Class C
D. Class D
[CORRECT] A. Class A
Rationale: Common office waste like paper and trash is categorized as ordinary combustibles
(Class A).
8. A fire in a commercial deep-fat fryer is a:
A. Class K fire
B. Class B fire
C. Class D fire
D. Class A fire
[CORRECT] A. Class K fire
, Rationale: While cooking oils are technically flammable liquids, NFPA 10 specifically classifies
fires involving commercial cooking appliances as Class K due to the high-heat properties of
vegetable/animal oils.
9. Which of the following is NOT considered a Class A fuel?
A. Rubber
B. Plastic
C. Acetylene
D. Wood
[CORRECT] C. Acetylene
Rationale: Acetylene is a flammable gas, falling under Class B classification. Rubber, certain
plastics, and wood are Class A.
10. Which extinguishing agent is generally considered incompatible with Class D combustible
metal fires?
A. Dry Powder (specifically for Class D)
B. Water
C. Argon
D. Graphite based agents
[CORRECT] B. Water
Rationale: Water can react violently with many combustible metals, exacerbating the fire or
causing explosions.专用 Class D agents are required.
11. Can a multi-purpose ABC dry chemical extinguisher be used on a Class C fire?
A. Yes
B. No
C. Only if the equipment is de-energized first
