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NFPA Firefighter I study materials
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NFPA Firefighter I practice questions

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Question 1Fire Fighter I

Which element completes the fire tetrahedron in addition to fuel, oxygen, and heat?

  1. Water vapor
  2. Chemical chain reaction Correct answer.
  3. Carbon monoxide
  4. Nitrogen

Explanation

The fire tetrahedron describes the four things needed for combustion: fuel, oxygen, heat, and an uninhibited chemical chain reaction. Removing any one of the four stops the combustion process. Nitrogen, carbon monoxide, and water vapor are products or inert components of the fire environment, not required elements of the tetrahedron.

Question 2Fire Fighter I

The acronym PASS is used to remember the steps for which action?

  1. Using a portable fire extinguisher Correct answer.
  2. Advancing a charged attack hoseline to the seat of the fire
  3. Donning a self-contained breathing apparatus facepiece
  4. Completing a primary search of the fire floor

Explanation

PASS stands for Pull the pin, Aim at the base of the fire, Squeeze the handle, and Sweep the nozzle side to side. It is a memory aid for operating a portable fire extinguisher. No other fireground skill uses this acronym.

Question 3Fire Fighter I

Which NFPA standard specifies requirements for structural fire fighting protective clothing?

  1. NFPA 1961
  2. NFPA 1971 Correct answer.
  3. NFPA 1977
  4. NFPA 1981

Explanation

NFPA 1971 covers the structural fire fighting protective ensemble, including coats, trousers, helmets, gloves, and hoods. NFPA 1981 covers open-circuit SCBA, and NFPA 1961 covers fire hose. Knowing which standard governs each item helps firefighters verify that equipment is compliant.

Question 4Fire Fighter I

What is the purpose of the bypass valve on an SCBA regulator?

  1. It locks the facepiece securely to the regulator assembly
  2. It supplies air continuously if the regulator fails Correct answer.
  3. It sounds an audible alarm when air pressure is low
  4. It purges accumulated moisture from the air cylinder

Explanation

The bypass valve allows air to flow directly from the cylinder to the facepiece, bypassing the regulator's demand mechanism. It is used when the regulator malfunctions or the user cannot draw air normally. The low-air alarm and the facepiece attachment perform different functions.

Question 5Fire Fighter I

Which knot is used to join two ropes together, particularly when the ropes are of different diameters?

  1. Becket bend Correct answer.
  2. Clove hitch
  3. Bowline
  4. Figure eight on a bight

Explanation

The becket bend, also called a sheet bend, joins two ropes and works well when the ropes differ in size or material. A bowline and a figure eight on a bight both create loops rather than joining two ropes. A clove hitch ties a rope to an object.

Question 6Fire Fighter I

Ground ladders should be set at an angle of approximately:

  1. 90 degrees
  2. 60 degrees
  3. 75 degrees Correct answer.
  4. 45 degrees

Explanation

The correct climbing angle for a ground ladder is about 75 degrees from horizontal, roughly one quarter of the ladder's working length out from the wall. This angle balances stability with ease of climbing. Angles that are too steep or too shallow increase the risk of the ladder slipping or tipping.

Question 7Fire Fighter I

Which type of fire stream has the greatest reach and penetration?

  1. Fog stream
  2. Straight fog stream
  3. Solid stream Correct answer.
  4. Broken stream

Explanation

A solid stream is discharged as a compact column of water, which gives it the longest reach and the most penetrating power. Fog and broken streams break the water into droplets, which absorb heat well but lose reach. Stream selection depends on the fire conditions and ventilation.

Question 8Fire Fighter I

A firefighter who becomes lost or trapped inside a structure should immediately:

  1. Transmit a MAYDAY on the radio Correct answer.
  2. Wait for the incident commander to call roll
  3. Continue searching until the low-air alarm sounds
  4. Exit through the nearest window without notifying anyone

Explanation

A MAYDAY declares to command and all companies that a firefighter is in distress and triggers the rapid intervention response. It should be transmitted as soon as the firefighter recognizes the emergency, not after air runs low. Delaying the call reduces the chance of a successful rescue.

Question 9Fire Fighter I

Which term describes the transition in which all combustible contents of a compartment ignite nearly simultaneously?

  1. Decay
  2. Rollover
  3. Backdraft
  4. Flashover Correct answer.

Explanation

Flashover is the change from a growth-stage fire to a fully developed fire, when heat feedback ignites all exposed fuel in the compartment at once. It is marked by very high heat release and temperatures that make the space untenable. Rollover and backdraft are different phenomena with different causes.

Question 10Fire Fighter I

A building with exterior walls of noncombustible masonry and interior structural members of wood is classified as which type of construction?

  1. Type III Correct answer.
  2. Type I
  3. Type IV
  4. Type V

Explanation

Type III, or ordinary construction, has noncombustible exterior walls with interior structural members that are wholly or partly combustible. This combination is a common fireground concern because the wood interior can burn while the masonry shell contains the heat. Type V is wood frame throughout, and Types I and IV have noncombustible interior structure.

Question 11Fire Fighter I

During a hydrant flow test, the pressure reading taken while water is discharging from the hydrant is called the:

  1. Atmospheric pressure
  2. Static pressure
  3. Residual pressure Correct answer.
  4. Elevation pressure

Explanation

Residual pressure is the pressure remaining in the water system while water is flowing. It is compared with the static pressure to judge how much more water the system can supply. Static pressure is read before any water flows.

Question 12Fire Fighter I

Which forcible entry method uses a key tool or lock cylinder removal to open a door while causing the least damage?

  1. Ramming
  2. Breaching
  3. Through-the-lock Correct answer.
  4. Conventional forcible entry

Explanation

Through-the-lock entry defeats the lock itself, typically by removing the cylinder or actuating the lock mechanism, so the door and frame are left largely intact. It is preferred when the door must be secured afterward. Conventional entry and ramming damage the door, frame, or wall.

Question 13Fire Fighter I

The primary search is intended to:

  1. Document property damage before overhaul begins
  2. Confirm that the fire has been fully extinguished
  3. Account for all firefighting personnel on the scene
  4. Quickly locate victims in likely occupied areas Correct answer.

Explanation

A primary search is a rapid, systematic sweep of the areas where victims are most likely to be, done early in the incident while conditions permit. It is fast and covers the most probable locations first. A secondary search is more thorough and occurs after the fire is controlled.

Question 14Fire Fighter I

Aqueous film-forming foam is most effective on which type of fire?

  1. Class D combustible metal fires
  2. Class C energized electrical fires
  3. Class B hydrocarbon fuel fires Correct answer.
  4. Class A wood and paper fires

Explanation

AFFF is designed for Class B flammable and combustible liquid fires, where it forms a film that seals the fuel surface from oxygen. It is not intended for ordinary combustibles, energized electrical equipment, or combustible metals. Using the wrong agent can allow the fire to reignite or can create a hazard.

Question 15Fire Fighter I

A fire involving vegetable oil in a commercial deep fryer is classified as:

  1. Class D
  2. Class K Correct answer.
  3. Class A
  4. Class B

Explanation

Class K covers fires in cooking appliances that involve combustible cooking media such as vegetable or animal oils and fats. These fires react violently to water because the water turns to steam and expels burning oil. A wet chemical agent is used to saponify the fuel.

Question 16Fire Fighter I

Composite SCBA cylinders must undergo hydrostatic testing every:

  1. 2 years
  2. 1 year
  3. 3 years
  4. 5 years Correct answer.

Explanation

Fully wrapped composite cylinders must be requalified hydrostatically at intervals set by the U.S. Department of Transportation, which is every five years for these cylinders. Cylinders also have a limited service life. A unit or department that skips requalification is using an unserviceable cylinder.

Question 17Fire Fighter I

In an incident command system, the optimal span of control is:

  1. Five subordinates Correct answer.
  2. One subordinate
  3. Ten subordinates
  4. Two subordinates

Explanation

The span of control is the number of subordinates one supervisor can effectively direct; the recommended range is roughly three to seven, with five considered optimal. Exceeding that range overloads the supervisor and reduces safety. Smaller spans are acceptable for complex or hazardous functions.

Question 18Fire Fighter I

The primary purpose of overhaul is to:

  1. Restore the building to a safe, habitable condition
  2. Find and extinguish hidden fire to prevent rekindle Correct answer.
  3. Ventilate the structure of remaining smoke
  4. Determine the cause of the fire for the report

Explanation

Overhaul is the systematic search for and extinguishment of hidden or smoldering fire after the main body of fire is knocked down. Its goal is to prevent rekindle before the company leaves the scene. Origin and cause work and smoke removal may occur during this phase but are not its primary purpose.

Question 19Fire Fighter I

In a building protected by automatic sprinklers, a fire typically causes:

  1. No sprinklers to operate until manually activated
  2. All sprinklers in the building to operate simultaneously
  3. All sprinklers on the fire floor to operate
  4. Only the sprinklers near the fire to operate Correct answer.

Explanation

Each sprinkler head has its own heat-sensitive element and operates independently when the rated temperature is reached. As a result, only the heads over the fire flow water, which limits damage. This is also why a closed sprinkler head on the fire floor does not protect the rest of the floor.

Question 20Fire Fighter I

Which action should take place before ventilation is performed during a fire attack?

  1. Completing overhaul of the room of origin
  2. Opening every window on the fire floor at the same time
  3. Locating the fire and coordinating with the attack team Correct answer.
  4. Shutting down the sprinkler system to improve visibility

Explanation

Ventilation must be coordinated with fire attack and based on a known fire location, or it can draw fire toward uninvolved areas and endanger crews. Ventilating before the attack line is ready can intensify the fire. The release of heat and smoke should be timed to support the advance of the hoseline.

Question 21Fire Fighter I

Which condition at a closed compartment most strongly suggests that a backdraft may occur when it is opened?

  1. Dense smoke under pressure and no visible flame Correct answer.
  2. A well-ventilated compartment with a steady burn
  3. Light-colored smoke drifting slowly from the eaves
  4. Flames visible inside at ceiling level

Explanation

A backdraft occurs when a fuel-rich, oxygen-starved fire receives a sudden inrush of air. Warning signs include heavy, pressurized smoke (often puffing or pulsing from openings), windows stained or discolored, and no visible flame. Ventilation must be controlled and coordinated in these conditions.

Question 22Fire Fighter I

Which type of foam is designed to extinguish fires involving polar solvents such as alcohols?

  1. Alcohol-resistant foam Correct answer.
  2. Compressed air foam
  3. High-expansion foam
  4. Fluoroprotein foam

Explanation

Polar solvents break down ordinary foam blankets, so alcohol-resistant foam is formulated to form a protective polymeric membrane over the fuel. Standard foams fail on these fuels. Matching the foam type to the fuel is essential for extinguishment.

Question 23Fire Fighter I

During an interior attack, the rapid intervention team should be:

  1. Assigned to the attack line as a backup crew
  2. Positioned at the command post to track personnel
  3. Working overhaul in the fire room to reduce fatigue
  4. Staged near the entry point with tools ready Correct answer.

Explanation

The rapid intervention team is a dedicated rescue crew for firefighters; it must be fully equipped and staged close enough to the entry point to deploy immediately. It is not given other fireground tasks. Using the crew for fire attack or overhaul eliminates the rescue capability when it is needed.

Question 24Fire Fighter I

The practical maximum vertical lift for a fire pump drafting from a static source is about:

  1. 10 to 15 feet
  2. 35 to 40 feet
  3. 20 to 25 feet Correct answer.
  4. 5 to 10 feet

Explanation

Although atmospheric pressure could theoretically support a column of water about 33.9 feet high, friction loss, imperfect vacuum, and water turbulence reduce the practical lift to roughly 20 to 25 feet. Attempting a greater lift causes cavitation and loss of capacity. Keeping the lift short protects pump performance.

Question 25Fire Fighter I

When ventilating a window from a ground ladder, a firefighter should:

  1. Work from the windward side, staying below the sill Correct answer.
  2. Stand directly in front of the window at sill height
  3. Break the lowest pane first to let smoke out
  4. Break the window from the leeward side with a pike pole

Explanation

Working from the windward side keeps smoke and heat moving away from the firefighter, and staying below the sill puts the ladder and the firefighter out of the path of the venting fire gases. Glass should be taken from the top of the window so it falls away from the ladder. Positioning in front of or beneath the opening exposes the firefighter to the discharge.

Question 26Fire Fighter I

The chin strap on a firefighter's helmet is intended primarily to:

  1. Secure the SCBA facepiece to the head
  2. Cushion the jaw against impact
  3. Hold the helmet in place Correct answer.
  4. Protect the neck from radiant heat

Explanation

The chin strap secures the helmet to the head so it does not shift or fall off during crawling, climbing, or sudden movements. It is not designed to protect the neck, hold the SCBA facepiece, or cushion the jaw.

Question 27Fire Fighter I

The bypass valve on an SCBA regulator is used to:

  1. Extend the low-air alarm time
  2. Supply air if regulator fails Correct answer.
  3. Purge water from the facepiece
  4. Increase the cylinder pressure

Explanation

The bypass valve supplies air directly from the cylinder to the facepiece if the regulator fails or becomes blocked. It is an emergency feature, not a way to increase pressure or purge water.

Question 28Fire Fighter I

A fire involving energized electrical equipment is classified as:

  1. Class A
  2. Class C Correct answer.
  3. Class D
  4. Class B

Explanation

Class C applies to fires involving energized electrical equipment, where the primary hazard is the electrical energy. Once power is removed, the fuel may be reclassified based on the burning material.

Question 29Fire Fighter I

The PASS acronym for portable extinguisher use stands for:

  1. Pull, Aim, Stand, Sweep
  2. Point, Aim, Squeeze, Stop
  3. Pull, Aim, Squeeze, Sweep Correct answer.
  4. Pull, Alert, Spray, Secure

Explanation

PASS stands for Pull the pin, Aim at the base of the fire, Squeeze the handle, and Sweep the nozzle. This sequence keeps the extinguisher operating and directs agent to the burning fuel.

Question 30Fire Fighter I

The main advantage of a preconnected attack line is that it:

  1. Requires less water pressure
  2. Can be deployed quickly Correct answer.
  3. Lasts longer in service
  4. Produces a wider stream

Explanation

A preconnected attack line is already attached to the pump and laid in a bed for immediate deployment, saving time at the fireground. It does not inherently change stream width, pressure requirements, or hose service life.

Question 31Fire Fighter I

A dry-barrel hydrant is designed so that the barrel is normally:

  1. Empty and drained Correct answer.
  2. Sealed by a clapper
  3. Filled with water
  4. Pressurized with foam

Explanation

A dry-barrel hydrant has a main valve below the frost line, so the barrel remains empty and drains after use. This prevents freezing in cold weather.

Question 32Fire Fighter I

The primary purpose of vertical ventilation is to:

  1. Improve visibility outside
  2. Cool the exterior walls
  3. Release hot smoke and gases upward Correct answer.
  4. Increase water pressure at the nozzle

Explanation

Vertical ventilation opens the roof or upper level to let hot smoke and gases escape upward. This improves interior visibility and reduces heat accumulation.

Question 33Fire Fighter I

Salvage covers are primarily used to:

  1. Protect property from water Correct answer.
  2. Mark the fire perimeter
  3. Absorb flammable liquids
  4. Support collapsed walls

Explanation

Salvage covers are placed over furniture, equipment, and stock to divert water and prevent water damage. They are not structural supports, absorbents, or perimeter markers.

Question 34Fire Fighter I

A rollover differs from a flashover in that a rollover involves:

  1. Collapse of the ceiling assembly
  2. Ignition of all room contents
  3. Flaming in the smoke layer Correct answer.
  4. A sudden increase in oxygen

Explanation

A rollover is the ignition of flammable gases in the smoke layer, producing flames that travel through the upper layer. A flashover involves simultaneous ignition of all combustible contents in the compartment.

Question 35Fire Fighter I

A bowstring truss roof is especially dangerous to interior firefighters because it:

  1. Resists collapse for hours
  2. Is limited to one-story buildings
  3. May fail with little warning Correct answer.
  4. Requires no roof ventilation

Explanation

Bowstring trusses concentrate large loads and can fail suddenly when fire attacks the chords or connections. Their large open spaces also hide fire and make roof operations hazardous.

Question 36Fire Fighter I

When an SCBA low-air alarm activates during interior operations, the firefighter should:

  1. Increase the breathing rate
  2. Notify command and exit immediately Correct answer.
  3. Remove the regulator to save air
  4. Reset the alarm and continue

Explanation

When the low-air alarm sounds, the firefighter must immediately notify the team or command and exit the hazard area. Continuing interior work risks running out of air.

Question 37Fire Fighter I

A hose clamp is used during a hose operation to:

  1. Increase nozzle pressure
  2. Couple mismatched threads
  3. Mark the hose for salvage
  4. Stop flow temporarily for repairs Correct answer.

Explanation

A hose clamp pinches the hose to stop water flow temporarily so a damaged section or appliance can be replaced. It does not increase pressure, adapt threads, or mark hose.

Question 38Fire Fighter I

Which nozzle setting is most effective for hydraulic ventilation?

  1. Wide fog pattern Correct answer.
  2. Straight stream
  3. Solid stream
  4. Narrow fog pattern

Explanation

A wide fog pattern placed near an opening moves a large volume of air and pulls smoke out through the opening. A straight or solid stream provides reach but little air movement.

Question 39Fire Fighter I

A centrifugal fire pump must be primed before drafting because it:

  1. Requires pressure to open the valve
  2. Cannot lift water without a prime Correct answer.
  3. Prevents water hammer
  4. Cools the pump bearings

Explanation

A centrifugal pump cannot create enough vacuum to lift water from a static source until it is primed and filled with water. Priming removes air from the pump and suction hose.

Question 40Fire Fighter I

A Halligan bar is most commonly paired with which tool for forcible entry?

  1. Flathead axe Correct answer.
  2. Pike pole
  3. Sledge hammer
  4. Bolt cutter

Explanation

The Halligan bar is commonly paired with a flathead axe; the axe can strike the bar and the two tools can be used together for forcing. This combination is often called the irons.

Question 41Fire Fighter I

In a right-hand search pattern, the firefighter begins by:

  1. Following the left wall
  2. Crawling straight ahead from the door
  3. Turning right and following the wall Correct answer.
  4. Searching the room center first

Explanation

In a right-hand search, the firefighter turns right at the entry and follows the wall to maintain orientation. The wall stay keeps the searcher from becoming disoriented in smoke.

Question 42Fire Fighter I

Unity of command on the fireground means that each firefighter:

  1. Carries one radio
  2. Reports to one supervisor Correct answer.
  3. Works in one division
  4. Has one assigned task

Explanation

Unity of command means each firefighter has only one supervisor, preventing conflicting orders. It does not limit radio use, division assignment, or task count.

Question 43Fire Fighter I

The fireground acronym PAR refers to:

  1. Personnel accountability report Correct answer.
  2. Pump and relay
  3. Post-arrival rescue
  4. Primary attack report

Explanation

PAR stands for personnel accountability report, a check that confirms the status of assigned personnel. It is used to account for firefighters during an incident.

Question 44Fire Fighter I

During overhaul, a thermal imaging camera is used mainly to:

  1. Find fire in voids Correct answer.
  2. Measure water flow
  3. Record radio traffic
  4. Detect gas leaks

Explanation

A thermal imaging camera shows temperature differences, helping firefighters find hidden fire in walls, ceilings, and voids during overhaul. It does not measure water flow, record radio traffic, or detect gas leaks.

Question 45Fire Fighter I

Water hammer in a fire hose is caused by:

  1. Sudden valve or nozzle closure Correct answer.
  2. Excessive hose length
  3. Air trapped in the hose
  4. A clogged nozzle tip

Explanation

Water hammer is a pressure surge caused by a sudden stop in water flow, such as closing a nozzle or valve quickly. It can damage hose and piping, so valves should be operated slowly.

Question 46Fire Fighter I

Finished foam is produced when foam concentrate is mixed with:

  1. Water and air Correct answer.
  2. Water and powder
  3. Air and carbon dioxide
  4. Powder and air

Explanation

Finished foam is made by mixing foam concentrate with water and then aerating the solution with air. The resulting blanket separates the fuel from oxygen and helps cool it.

Question 47Fire Fighter I

Carbon dioxide extinguishers are preferred for energized electrical fires because they:

  1. Blanket the fuel with a foam layer
  2. Cool the fire rapidly with water
  3. Are nonconductive and leave no residue Correct answer.
  4. Absorb oxygen chemically

Explanation

Carbon dioxide is nonconductive and leaves no residue, making it suitable for energized electrical equipment. It displaces oxygen and cools somewhat but is not a water or foam agent.

Question 48Fire Fighter I

The two-in/two-out rule requires that:

  1. Two outside for each two inside Correct answer.
  2. Two enter while two pump
  3. Two officers command and report
  4. Two hose lines at each entry

Explanation

The two-in/two-out rule requires at least two firefighters outside to support each two firefighters inside an immediately dangerous area. The outside team can rescue or assist the interior team.

Question 49Fire Fighter I

The butt of a ground ladder is the end that:

  1. Carries the halyard
  2. Rests on the ground Correct answer.
  3. Extends above the roof
  4. Holds the tip

Explanation

The butt is the lower end of a ground ladder that rests on the ground. The tip is the upper end that contacts the building.

Question 50Fire Fighter I

A transitional fire attack involves:

  1. Ventilating the roof before entry
  2. Advancing a line through the front door
  3. Using foam instead of water
  4. Applying water from outside before entry Correct answer.

Explanation

A transitional attack applies water from outside into the fire compartment to cool the fire before firefighters enter. It can reduce flashover potential and improve conditions for an interior attack.