(OSFMFEI02) Fire Extinguisher 1 Practice Exam
1. What type of materials are classified as Class A fires?
A. Flammable liquids
B. Ordinary combustibles
C. Energized electrical equipment
D. Combustible metals
Answer: B
Explanation: Class A fires involve ordinary combustibles such as wood, paper, and cloth.
2. Which extinguisher type is best suited for Class B fires?
A. Water-based extinguisher
B. Carbon dioxide extinguisher
C. Dry chemical extinguisher
D. Wet chemical extinguisher
Answer: C
Explanation: Dry chemical extinguishers are effective for Class B fires involving flammable liquids and
gases.
3. Which fire class is associated with energized electrical equipment?
A. Class A
B. Class B
C. Class C
D. Class D
Answer: C
Explanation: Class C fires involve energized electrical equipment, requiring non-conductive extinguishing
agents.
4. Which extinguisher is most appropriate for a grease fire in a kitchen?
A. Water-based extinguisher
B. Foam extinguisher
C. Dry chemical extinguisher
D. Wet chemical extinguisher
Answer: D
Explanation: Wet chemical extinguishers are specifically designed to handle cooking oil and grease fires
(Class K).
5. What does the PASS method stand for in fire extinguisher operation?
A. Pull, Aim, Squeeze, Sweep
B. Press, Alert, Spray, Shutoff
C. Push, Aim, Squeeze, Spray
D. Pull, Alert, Squeeze, Spray
,Answer: A
Explanation: The PASS method instructs users to Pull the pin, Aim at the base of the fire, Squeeze the
handle, and Sweep the agent over the fire.
6. What type of fire involves combustible metals?
A. Class A
B. Class D
C. Class C
D. Class K
Answer: B
Explanation: Class D fires involve combustible metals such as magnesium and titanium, which require
specialized extinguishing agents.
7. Which extinguisher type is effective for electrical fires?
A. Water-based extinguisher
B. Dry chemical extinguisher
C. Wet chemical extinguisher
D. Foam extinguisher
Answer: B
Explanation: Dry chemical extinguishers are non-conductive and effective in fighting Class C fires
involving electrical equipment.
8. What is the primary hazard when using a water-based extinguisher on a Class C fire?
A. Electrical shock
B. Reignition
C. Chemical reaction
D. Excessive foam
Answer: A
Explanation: Water conducts electricity, so using a water-based extinguisher on an electrical (Class C)
fire can result in electrical shock.
9. How often should a monthly visual inspection of a fire extinguisher be performed?
A. Annually
B. Quarterly
C. Monthly
D. Weekly
Answer: C
Explanation: Fire extinguishers should undergo monthly visual inspections to ensure they are in proper
working condition.
10. Which regulatory standard governs the use of portable fire extinguishers in the United States?
A. OSHA 1910
B. NFPA 10
,C. NFPA 25
D. UL 711
Answer: B
Explanation: NFPA 10 is the standard that provides guidelines for the selection, installation, inspection,
and maintenance of portable fire extinguishers.
11. What component is essential when performing a fire extinguisher inspection?
A. Checking the expiration date
B. Measuring the water level
C. Inspecting the pressure gauge
D. Verifying the foam quality
Answer: C
Explanation: Inspecting the pressure gauge is critical to ensure the extinguisher is properly pressurized
and ready for use.
12. Which fire extinguisher type discharges carbon dioxide to smother the fire?
A. Dry chemical extinguisher
B. Foam extinguisher
C. Carbon dioxide extinguisher
D. Wet chemical extinguisher
Answer: C
Explanation: Carbon dioxide (CO₂) extinguishers work by displacing oxygen around the fire, thereby
smothering it.
13. What is the key advantage of a foam extinguisher for Class B fires?
A. It cools the fire rapidly
B. It electrically insulates
C. It forms a blanket over the fuel
D. It evaporates quickly
Answer: C
Explanation: Foam extinguishers create a barrier between the fuel and the oxygen, effectively
smothering the fire.
14. In the PASS method, what does “Sweep” instruct the user to do?
A. Remove debris from the area
B. Sweep the extinguishing agent side-to-side at the base
C. Sweep the area to find the fire’s source
D. Sweep the nozzle across the top of the flames
Answer: B
Explanation: “Sweep” means to move the extinguisher nozzle side-to-side at the base of the fire to cover
the area with the extinguishing agent.
15. When selecting an extinguisher, why is it important to match the extinguisher type to the fire
class?
, A. To reduce maintenance
B. To increase user confidence
C. To ensure effective extinguishing
D. To lower cost
Answer: C
Explanation: Matching the extinguisher type to the fire class is crucial to ensure that the fire is
effectively and safely extinguished.
16. What does NFPA 10 require regarding the maintenance frequency of fire extinguishers?
A. Daily testing
B. Monthly inspections and annual maintenance
C. Biannual maintenance
D. Inspection every five years
Answer: B
Explanation: NFPA 10 requires monthly visual inspections and annual maintenance checks for fire
extinguishers to ensure operational readiness.
17. Which fire class is typically associated with cooking oils and fats?
A. Class A
B. Class B
C. Class C
D. Class K
Answer: D
Explanation: Class K fires involve cooking oils and fats and are commonly encountered in commercial
kitchens.
18. What is the first step in using a fire extinguisher effectively?
A. Squeeze the handle
B. Pull the safety pin
C. Aim at the top of the flames
D. Sweep the area
Answer: B
Explanation: The first step is to pull the safety pin to break the tamper seal, enabling the extinguisher to
be operated.
19. What is a common maintenance requirement for portable fire extinguishers?
A. Repainting the casing
B. Hydrostatic testing
C. Upgrading to digital monitors
D. Refilling the water reservoir
Answer: B
Explanation: Hydrostatic testing is necessary to ensure the extinguisher’s structural integrity and proper
functioning.
1. What type of materials are classified as Class A fires?
A. Flammable liquids
B. Ordinary combustibles
C. Energized electrical equipment
D. Combustible metals
Answer: B
Explanation: Class A fires involve ordinary combustibles such as wood, paper, and cloth.
2. Which extinguisher type is best suited for Class B fires?
A. Water-based extinguisher
B. Carbon dioxide extinguisher
C. Dry chemical extinguisher
D. Wet chemical extinguisher
Answer: C
Explanation: Dry chemical extinguishers are effective for Class B fires involving flammable liquids and
gases.
3. Which fire class is associated with energized electrical equipment?
A. Class A
B. Class B
C. Class C
D. Class D
Answer: C
Explanation: Class C fires involve energized electrical equipment, requiring non-conductive extinguishing
agents.
4. Which extinguisher is most appropriate for a grease fire in a kitchen?
A. Water-based extinguisher
B. Foam extinguisher
C. Dry chemical extinguisher
D. Wet chemical extinguisher
Answer: D
Explanation: Wet chemical extinguishers are specifically designed to handle cooking oil and grease fires
(Class K).
5. What does the PASS method stand for in fire extinguisher operation?
A. Pull, Aim, Squeeze, Sweep
B. Press, Alert, Spray, Shutoff
C. Push, Aim, Squeeze, Spray
D. Pull, Alert, Squeeze, Spray
,Answer: A
Explanation: The PASS method instructs users to Pull the pin, Aim at the base of the fire, Squeeze the
handle, and Sweep the agent over the fire.
6. What type of fire involves combustible metals?
A. Class A
B. Class D
C. Class C
D. Class K
Answer: B
Explanation: Class D fires involve combustible metals such as magnesium and titanium, which require
specialized extinguishing agents.
7. Which extinguisher type is effective for electrical fires?
A. Water-based extinguisher
B. Dry chemical extinguisher
C. Wet chemical extinguisher
D. Foam extinguisher
Answer: B
Explanation: Dry chemical extinguishers are non-conductive and effective in fighting Class C fires
involving electrical equipment.
8. What is the primary hazard when using a water-based extinguisher on a Class C fire?
A. Electrical shock
B. Reignition
C. Chemical reaction
D. Excessive foam
Answer: A
Explanation: Water conducts electricity, so using a water-based extinguisher on an electrical (Class C)
fire can result in electrical shock.
9. How often should a monthly visual inspection of a fire extinguisher be performed?
A. Annually
B. Quarterly
C. Monthly
D. Weekly
Answer: C
Explanation: Fire extinguishers should undergo monthly visual inspections to ensure they are in proper
working condition.
10. Which regulatory standard governs the use of portable fire extinguishers in the United States?
A. OSHA 1910
B. NFPA 10
,C. NFPA 25
D. UL 711
Answer: B
Explanation: NFPA 10 is the standard that provides guidelines for the selection, installation, inspection,
and maintenance of portable fire extinguishers.
11. What component is essential when performing a fire extinguisher inspection?
A. Checking the expiration date
B. Measuring the water level
C. Inspecting the pressure gauge
D. Verifying the foam quality
Answer: C
Explanation: Inspecting the pressure gauge is critical to ensure the extinguisher is properly pressurized
and ready for use.
12. Which fire extinguisher type discharges carbon dioxide to smother the fire?
A. Dry chemical extinguisher
B. Foam extinguisher
C. Carbon dioxide extinguisher
D. Wet chemical extinguisher
Answer: C
Explanation: Carbon dioxide (CO₂) extinguishers work by displacing oxygen around the fire, thereby
smothering it.
13. What is the key advantage of a foam extinguisher for Class B fires?
A. It cools the fire rapidly
B. It electrically insulates
C. It forms a blanket over the fuel
D. It evaporates quickly
Answer: C
Explanation: Foam extinguishers create a barrier between the fuel and the oxygen, effectively
smothering the fire.
14. In the PASS method, what does “Sweep” instruct the user to do?
A. Remove debris from the area
B. Sweep the extinguishing agent side-to-side at the base
C. Sweep the area to find the fire’s source
D. Sweep the nozzle across the top of the flames
Answer: B
Explanation: “Sweep” means to move the extinguisher nozzle side-to-side at the base of the fire to cover
the area with the extinguishing agent.
15. When selecting an extinguisher, why is it important to match the extinguisher type to the fire
class?
, A. To reduce maintenance
B. To increase user confidence
C. To ensure effective extinguishing
D. To lower cost
Answer: C
Explanation: Matching the extinguisher type to the fire class is crucial to ensure that the fire is
effectively and safely extinguished.
16. What does NFPA 10 require regarding the maintenance frequency of fire extinguishers?
A. Daily testing
B. Monthly inspections and annual maintenance
C. Biannual maintenance
D. Inspection every five years
Answer: B
Explanation: NFPA 10 requires monthly visual inspections and annual maintenance checks for fire
extinguishers to ensure operational readiness.
17. Which fire class is typically associated with cooking oils and fats?
A. Class A
B. Class B
C. Class C
D. Class K
Answer: D
Explanation: Class K fires involve cooking oils and fats and are commonly encountered in commercial
kitchens.
18. What is the first step in using a fire extinguisher effectively?
A. Squeeze the handle
B. Pull the safety pin
C. Aim at the top of the flames
D. Sweep the area
Answer: B
Explanation: The first step is to pull the safety pin to break the tamper seal, enabling the extinguisher to
be operated.
19. What is a common maintenance requirement for portable fire extinguishers?
A. Repainting the casing
B. Hydrostatic testing
C. Upgrading to digital monitors
D. Refilling the water reservoir
Answer: B
Explanation: Hydrostatic testing is necessary to ensure the extinguisher’s structural integrity and proper
functioning.
