NFPA CWMS Practice Exam
Certified Wildfire Mitigation Specialist | 120 Multiple-Choice Questions
1. What does the NFPA credential CWMS stand for?
A. Certified Water Mist System specialist
B. Certified Wildland Management Supervisor
C. Certified Wildfire Monitoring Specialist
D. Certified Wildfire Mitigation Specialist
Correct Answer: D. Certified Wildfire Mitigation Specialist
Rationale: CWMS is NFPA's Certified Wildfire Mitigation Specialist credential, which
recognizes expertise in reducing wildfire risk to people, homes and communities.
2. Which three elements make up the fire triangle?
A. Heat, fuel and oxygen
B. Wind, slope and fuel
C. Heat, humidity and wind
D. Fuel, topography and weather
Correct Answer: A. Heat, fuel and oxygen
Rationale: Combustion needs heat, fuel and oxygen. Removing any one of them
extinguishes or prevents fire.
3. Which three factors make up the wildland fire behavior triangle?
A. Heat, fuel and oxygen
B. Fuel, people and structures
C. Fuel, weather and topography
D. Wind, drought and lightning
Correct Answer: C. Fuel, weather and topography
Rationale: Fire behavior is governed by the fuels available, the weather, and the
terrain (topography).
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,4. Heat carried by the movement of hot gases and air is called:
A. Conduction
B. Convection
C. Radiation
D. Insulation
Correct Answer: B. Convection
Rationale: Convection transfers heat through moving gases or fluids and drives
preheating of fuels ahead of and above a fire.
5. Which heat transfer mechanism can break windows and ignite siding
without direct flame contact?
A. Conduction
B. Evaporation
C. Sublimation
D. Radiation
Correct Answer: D. Radiation
Rationale: Radiant heat travels as electromagnetic energy through the air and can
ignite materials or fracture glass at a distance.
6. Heat transfer by direct contact between materials is called:
A. Convection
B. Radiation
C. Advection
D. Conduction
Correct Answer: D. Conduction
Rationale: Conduction moves heat through direct molecular contact, such as heat
passing along a metal rod.
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,7. What are firebrands (embers)?
A. Fire retardant droplets
B. Burning pieces of material lofted by the fire and carried by wind
C. Heat waves emitted from the flame front
D. Smoke particles that contain no heat
Correct Answer: B. Burning pieces of material lofted by the fire and carried by
wind
Rationale: Firebrands are airborne burning fragments that can ignite fuels and
structures far ahead of the main fire.
8. A new fire started ahead of the main fire by windblown embers is called:
A. A backing fire
B. A flanking fire
C. A crown fire
D. A spot fire
Correct Answer: D. A spot fire
Rationale: Spotting occurs when firebrands land in receptive fuels beyond the fire
perimeter and start new fires.
9. Which best describes ladder fuels?
A. Fuels stacked on a ladder-shaped rack
B. Fuels found only on steep slopes
C. Buried organic matter in the soil
D. Vegetation that allows a surface fire to climb into tree crowns
Correct Answer: D. Vegetation that allows a surface fire to climb into tree
crowns
Rationale: Ladder fuels such as shrubs, low branches and small trees provide
vertical continuity between surface fuels and the canopy.
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, 10. Which statement about fine fuels is correct?
A. They ignite easily and react quickly to changes in moisture
B. They take months to dry out
C. They burn only when ground moisture is low
D. They are more than 3 inches in diameter
Correct Answer: A. They ignite easily and react quickly to changes in moisture
Rationale: Fine fuels such as grass, needles and twigs have a high
surface-area-to-volume ratio, so they dry and ignite quickly.
11. A 1-hour timelag fuel has a diameter of approximately:
A. 1 to 3 inches
B. Less than 1/4 inch
C. 3 to 8 inches
D. More than 8 inches
Correct Answer: B. Less than 1/4 inch
Rationale: Timelag classes group dead fuels by response to moisture: 1-hour fuels
are under 1/4 inch in diameter.
12. A 100-hour timelag fuel has a diameter of approximately:
A. Less than 1/4 inch
B. 1 to 3 inches
C. 1/4 to 1 inch
D. 3 to 8 inches
Correct Answer: B. 1 to 3 inches
Rationale: 100-hour fuels span about 1 to 3 inches. 10-hour fuels are 1/4 to 1 inch
and 1000-hour fuels are 3 to 8 inches.
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Certified Wildfire Mitigation Specialist | 120 Multiple-Choice Questions
1. What does the NFPA credential CWMS stand for?
A. Certified Water Mist System specialist
B. Certified Wildland Management Supervisor
C. Certified Wildfire Monitoring Specialist
D. Certified Wildfire Mitigation Specialist
Correct Answer: D. Certified Wildfire Mitigation Specialist
Rationale: CWMS is NFPA's Certified Wildfire Mitigation Specialist credential, which
recognizes expertise in reducing wildfire risk to people, homes and communities.
2. Which three elements make up the fire triangle?
A. Heat, fuel and oxygen
B. Wind, slope and fuel
C. Heat, humidity and wind
D. Fuel, topography and weather
Correct Answer: A. Heat, fuel and oxygen
Rationale: Combustion needs heat, fuel and oxygen. Removing any one of them
extinguishes or prevents fire.
3. Which three factors make up the wildland fire behavior triangle?
A. Heat, fuel and oxygen
B. Fuel, people and structures
C. Fuel, weather and topography
D. Wind, drought and lightning
Correct Answer: C. Fuel, weather and topography
Rationale: Fire behavior is governed by the fuels available, the weather, and the
terrain (topography).
Page 1
,4. Heat carried by the movement of hot gases and air is called:
A. Conduction
B. Convection
C. Radiation
D. Insulation
Correct Answer: B. Convection
Rationale: Convection transfers heat through moving gases or fluids and drives
preheating of fuels ahead of and above a fire.
5. Which heat transfer mechanism can break windows and ignite siding
without direct flame contact?
A. Conduction
B. Evaporation
C. Sublimation
D. Radiation
Correct Answer: D. Radiation
Rationale: Radiant heat travels as electromagnetic energy through the air and can
ignite materials or fracture glass at a distance.
6. Heat transfer by direct contact between materials is called:
A. Convection
B. Radiation
C. Advection
D. Conduction
Correct Answer: D. Conduction
Rationale: Conduction moves heat through direct molecular contact, such as heat
passing along a metal rod.
Page 2
,7. What are firebrands (embers)?
A. Fire retardant droplets
B. Burning pieces of material lofted by the fire and carried by wind
C. Heat waves emitted from the flame front
D. Smoke particles that contain no heat
Correct Answer: B. Burning pieces of material lofted by the fire and carried by
wind
Rationale: Firebrands are airborne burning fragments that can ignite fuels and
structures far ahead of the main fire.
8. A new fire started ahead of the main fire by windblown embers is called:
A. A backing fire
B. A flanking fire
C. A crown fire
D. A spot fire
Correct Answer: D. A spot fire
Rationale: Spotting occurs when firebrands land in receptive fuels beyond the fire
perimeter and start new fires.
9. Which best describes ladder fuels?
A. Fuels stacked on a ladder-shaped rack
B. Fuels found only on steep slopes
C. Buried organic matter in the soil
D. Vegetation that allows a surface fire to climb into tree crowns
Correct Answer: D. Vegetation that allows a surface fire to climb into tree
crowns
Rationale: Ladder fuels such as shrubs, low branches and small trees provide
vertical continuity between surface fuels and the canopy.
Page 3
, 10. Which statement about fine fuels is correct?
A. They ignite easily and react quickly to changes in moisture
B. They take months to dry out
C. They burn only when ground moisture is low
D. They are more than 3 inches in diameter
Correct Answer: A. They ignite easily and react quickly to changes in moisture
Rationale: Fine fuels such as grass, needles and twigs have a high
surface-area-to-volume ratio, so they dry and ignite quickly.
11. A 1-hour timelag fuel has a diameter of approximately:
A. 1 to 3 inches
B. Less than 1/4 inch
C. 3 to 8 inches
D. More than 8 inches
Correct Answer: B. Less than 1/4 inch
Rationale: Timelag classes group dead fuels by response to moisture: 1-hour fuels
are under 1/4 inch in diameter.
12. A 100-hour timelag fuel has a diameter of approximately:
A. Less than 1/4 inch
B. 1 to 3 inches
C. 1/4 to 1 inch
D. 3 to 8 inches
Correct Answer: B. 1 to 3 inches
Rationale: 100-hour fuels span about 1 to 3 inches. 10-hour fuels are 1/4 to 1 inch
and 1000-hour fuels are 3 to 8 inches.
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