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Houston Firefighter practice questions

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Question 1Fire Suppression and Emergency Response

A Houston firefighter arrives at a two-story house with smoke showing from the second-floor windows. Which action best reflects the standard sequence for establishing water supply and initiating fire attack?

  1. Charge the attack line before securing a water source
  2. Connect a hydrant supply line, stretch the attack line, and advance toward the fire floor Correct answer.
  3. Wait for the ladder truck to ventilate before stretching any line
  4. Enter through the front door without a charged line to locate the fire

Explanation

Standard practice is to secure a water supply, stretch and charge the attack line, and advance on the fire floor. Advancing without a charged line or before securing supply compromises crew safety and fire control.

Question 2Fire Suppression and Emergency Response

During size-up of a commercial occupancy, which factor most directly indicates the need to request additional alarms early?

  1. Presence of a nearby hydrant
  2. Heavy fire volume with a large, complex floor plan Correct answer.
  3. Daytime occupancy status
  4. A single-story building with a small footprint

Explanation

Large fire volume combined with a complex layout signals that the initial assignment will be insufficient, warranting additional alarms. Building size, fire load, and layout drive escalation decisions.

Question 3Fire Suppression and Emergency Response

Which type of fire attack directs a straight stream from the exterior through an opening to cool hot gases before interior entry?

  1. Indirect attack
  2. Defensive attack
  3. Combination attack
  4. Transitional attack Correct answer.

Explanation

A transitional attack applies water from the exterior to cool the fire and improve interior conditions before crews enter. It is distinguished from purely defensive operations and from interior indirect or combination methods.

Question 4Fire Suppression and Emergency Response

A firefighter must advance a hoseline up an interior stairwell toward the fire floor. Which practice supports crew safety and effectiveness?

  1. Coil excess hose at the base of the stairs
  2. Leave the line uncharged until the fire floor is reached
  3. Advance with the nozzle closed until reaching the seat of the fire
  4. Keep the line charged and bleed air before advancing up the stairs Correct answer.

Explanation

Charging and bleeding the line before advancing removes air and ensures immediate water at the nozzle. Excess hose should be managed to avoid kinks, and the line must be charged before entry.

Question 5Fire Suppression and Emergency Response

Which nozzle pattern is generally recommended to reduce steam production and thermal injury risk when advancing on a fire in a small compartment?

  1. An open nozzle with no pattern control
  2. A full fog pattern swept across the room
  3. A straight or narrow stream applied at the base of the fire Correct answer.
  4. A wide fog pattern aimed at the ceiling

Explanation

A straight or narrow stream applied to the burning material limits excess steam generation. Wide fog patterns in a small compartment can create steam that harms occupants and firefighters.

Question 6Fire Suppression and Emergency Response

A firefighter is assigned to forcible entry on a commercial steel door with a heavy frame. Which tool application is most appropriate for gaining control of the door?

  1. Use a set of irons to gap the door and defeat the latch Correct answer.
  2. Use a sledgehammer to break the door frame
  3. Use a pick-head axe to cut through the steel slab
  4. Use a prying tool on the hinge pins first

Explanation

A set of irons, using a prying tool and an axe, is the standard approach to gap and defeat a heavy door's latch. Cutting the slab or striking the frame is inefficient and damages the opening unnecessarily.

Question 7Fire Suppression and Emergency Response

Which search method places a firefighter at a wall and follows it to locate and search rooms in reduced visibility?

  1. Right-hand search
  2. Oriented search Correct answer.
  3. Left-hand search
  4. Perimeter search

Explanation

An oriented search uses a wall as a reference to systematically cover a room and maintain orientation. Following a specific hand or side alone without orientation can cause crews to miss areas or become disoriented.

Question 8Fire Suppression and Emergency Response

A firefighter operating on the fireground hears a PASS device activation from a downed crew member. What should the firefighter do first?

  1. Locate and assist the downed member while transmitting a mayday Correct answer.
  2. Silence the alarm by turning off the device
  3. Reset the PASS device remotely
  4. Continue the assigned task until the incident commander directs otherwise

Explanation

A PASS activation indicates a firefighter may be in distress, requiring immediate location and assistance along with a mayday transmission. Ignoring or silencing the alarm without addressing the member endangers the crew.

Question 9Fire Suppression and Emergency Response

Which condition is a recognized indicator of possible flashover during interior operations?

  1. Cool ambient temperature at the floor
  2. Steady smoke layer at mid-room height
  3. Clear visibility near the fire room
  4. Rapidly rising heat with flames rolling across the ceiling Correct answer.

Explanation

Rolling flames and rapidly rising heat indicate imminent flashover and require immediate cooling or withdrawal. Stable conditions or clear visibility do not signal the same hazard.

Question 10Fire Suppression and Emergency Response

When performing ventilation on a residential structure fire, which action supports coordinated fire attack?

  1. Delay ventilation until overhaul
  2. Ventilate on the fire floor after attack lines are in position Correct answer.
  3. Ventilate the attic before the fire floor is located
  4. Open all windows on every floor at once

Explanation

Ventilation should be coordinated with fire attack so hot gases are released as water is applied. Opening all windows indiscriminately or delaying until overhaul can worsen conditions or increase damage.

Question 11Fire Suppression and Emergency Response

Which ladder placement consideration is most important when raising a ground ladder to a window for rescue?

  1. Place the tip several feet below the sill
  2. Set the ladder at a near-vertical angle
  3. Position the tip at or slightly above the sill with proper angle and footing Correct answer.
  4. Lean the ladder against the glass

Explanation

The ladder tip should reach the sill or slightly above so a trapped occupant can exit safely, with proper angle and secure footing. Placing the tip below the sill or against glass is unsafe and ineffective.

Question 12Fire Suppression and Emergency Response

During a vehicle extrication on a Houston freeway, which practice best protects the scene from secondary collisions?

  1. Rely on passing motorists to slow down
  2. Place flares only after extrication is complete
  3. Work directly in the traffic lane without warning devices
  4. Establish a protected work zone with apparatus placement and traffic control Correct answer.

Explanation

A protected work zone using apparatus positioning and traffic control reduces the risk of secondary collisions. Working unprotected in traffic or delaying warning devices endangers responders.

Question 13Fire Suppression and Emergency Response

Which tool is specifically designed to cut through vehicle roof posts and structural members during extrication?

  1. Pick-head axe
  2. Hydraulic cutter Correct answer.
  3. Pike pole
  4. Halligan bar

Explanation

A hydraulic cutter provides the force needed to cut roof posts and structural members. Pike poles, axes, and Halligan bars are not designed for this cutting task.

Question 14Fire Suppression and Emergency Response

A firefighter encounters a vehicle with a high-voltage battery system after a crash. Which action is most appropriate before cutting?

  1. Identify the battery location and follow the manufacturer's disable procedure Correct answer.
  2. Assume the system is de-energized after the ignition is off
  3. Spray water on the battery pack to cool it
  4. Cut any visible orange cable immediately

Explanation

High-voltage systems require identifying the battery and following the manufacturer's shutdown procedure to isolate power. Cutting cables or assuming de-energization can cause shock or fire.

Question 15Fire Suppression and Emergency Response

Which factor most affects the friction loss in a hoseline during firefighting operations?

  1. Length of the nozzle bail
  2. Flow rate through the hose Correct answer.
  3. Type of nozzle tip material
  4. Color of the hose jacket

Explanation

Friction loss increases with the square of flow rate, making flow the dominant variable. Hose color, bail length, and tip material do not materially affect friction loss.

Question 16Fire Suppression and Emergency Response

When a pump operator is supplying multiple attack lines, which action helps maintain adequate pressure at the nozzles?

  1. Close the tank-to-pump valve after initial charging
  2. Set the throttle once and leave it unchanged
  3. Monitor the pressure gauge and adjust throttle as lines are opened or closed Correct answer.
  4. Rely solely on the booster tank for supply

Explanation

Nozzle pressure changes as lines open and close, so the operator must monitor gauges and adjust the throttle. A fixed throttle setting or reliance on the booster tank will not sustain adequate pressure.

Question 17Fire Suppression and Emergency Response

Which water supply source is typically used by Houston fire apparatus when a pressurized hydrant is unavailable?

  1. Drafting from a static source such as a pond or drafting pit Correct answer.
  2. Relying on the booster tank for the entire incident
  3. Waiting for a hydrant to be installed
  4. Using a garden hose connection

Explanation

Drafting from a static water source allows apparatus to establish supply when hydrants are unavailable. Booster tanks are limited, and garden hose connections cannot supply fire flows.

Question 18Fire Suppression and Emergency Response

A firefighter is tasked with opening a ceiling to check for fire extension. Which technique is most appropriate?

  1. Break the ceiling with a sledgehammer randomly
  2. Pull the ceiling in a controlled area with a pike pole and inspect above Correct answer.
  3. Open the ceiling only after overhaul is complete
  4. Cut a large opening across the entire room

Explanation

Controlled ceiling openings with a pike pole allow inspection for extension without unnecessary damage. Large or random openings and delaying until overhaul reduce effectiveness and increase damage.

Question 19Fire Suppression and Emergency Response

Which hazard is most associated with lightweight wood truss roof construction during firefighting operations?

  1. Reduced smoke production
  2. Improved fire resistance
  3. Increased water runoff
  4. Early collapse under fire conditions Correct answer.

Explanation

Lightweight truss assemblies can fail early when exposed to fire, creating a significant collapse hazard. They do not improve fire resistance or reduce smoke production.

Question 20Fire Suppression and Emergency Response

During a structure fire, a firefighter notices the door is hot to the touch and smoke is pushing from the top. What does this most likely indicate?

  1. The room is unoccupied and safe to enter
  2. Ventilation has already been completed
  3. The fire has been extinguished
  4. Fire is present on the other side and conditions may worsen on entry Correct answer.

Explanation

A hot door and pressurized smoke indicate fire on the other side and potential for worsening conditions. These signs call for caution and controlled entry with a charged line.

Question 21Fire Suppression and Emergency Response

Which action is appropriate when a firefighter becomes disoriented inside a structure and cannot locate an exit?

  1. Activate the PASS device and follow a wall while transmitting a mayday Correct answer.
  2. Continue searching randomly for an exit
  3. Remove the SCBA facepiece to improve visibility
  4. Wait silently for the crew to return

Explanation

Activating the PASS device, following a wall, and transmitting a mayday improves the chance of rescue. Removing the facepiece or waiting silently endangers the firefighter.

Question 22Fire Suppression and Emergency Response

Which SCBA check should be performed immediately before entering a hazardous atmosphere?

  1. Inspect the cylinder color
  2. Confirm the regulator is disconnected
  3. Check only the harness straps
  4. Verify cylinder pressure and confirm a proper facepiece seal Correct answer.

Explanation

Cylinder pressure and facepiece seal verification ensure the SCBA will function during entry. Harness straps alone or a disconnected regulator do not confirm operational readiness.

Question 23Fire Suppression and Emergency Response

A firefighter is evaluating a report of smoke in a large warehouse with no visible fire. Which initial action is most appropriate?

  1. Investigate with a charged line and thermal imager while establishing command Correct answer.
  2. Wait outside until flames are visible
  3. Assume it is a false alarm and clear the scene
  4. Ventilate all doors before investigating

Explanation

Investigating with a charged line and thermal imager while establishing command addresses the potential for hidden fire. Dismissing the report or waiting for visible flames risks escalation.

Question 24Fire Suppression and Emergency Response

Which factor should a firefighter consider when choosing between an interior attack and a defensive strategy at a well-involved building?

  1. Color of the apparatus
  2. Number of windows on the building
  3. Structural stability and fire volume affecting crew safety Correct answer.
  4. Type of hose couplings used

Explanation

The decision hinges on structural stability, fire volume, and crew safety. Cosmetic or equipment details do not determine the strategic mode.

Question 25Fire Suppression and Emergency Response

During overhaul, which practice helps detect hidden fire in walls and ceilings?

  1. Spray water indiscriminately throughout the structure
  2. Assume the fire is out once flames are gone
  3. Use a thermal imager and open suspect areas for inspection Correct answer.
  4. Close all windows to retain heat

Explanation

Thermal imaging combined with targeted opening reveals hidden hot spots during overhaul. Indiscriminate water application or assuming extinguishment can leave fire undetected.

Question 26Fire Suppression and Emergency Response

A Houston firefighter is advancing a 1¾-inch attack line into a single-family dwelling and the nozzle team must overcome a 30-foot vertical rise to reach the second floor. Which pressure consideration applies to this hoseline?

  1. The pump discharge pressure must be reduced to offset the weight of water in the line
  2. The nozzle pressure remains unaffected because elevation loss applies only to standpipes
  3. The nozzle pressure must be increased by roughly 5 psi for each foot of elevation gained
  4. The pump operator should add 0.5 psi per foot of vertical rise to the discharge pressure Correct answer.

Explanation

Elevation gain requires adding about 0.5 psi per foot of rise to the pump discharge pressure to keep the nozzle pressure at its designed level. A 30-foot rise therefore calls for roughly 15 psi of additional engine pressure. Failing to account for this leaves the nozzle team with a weak, ineffective stream.

Question 27Fire Suppression and Emergency Response

A crew is preparing to make entry through a door that opens toward them and appears locked with no visible hardware. Which forcible entry approach is most appropriate?

  1. Strike the doorknob with a flat-head axe to shear the spindle
  2. Use a rotary saw to cut the hinges from the outside
  3. Set the adz of a pick-head axe into the gap and pry outward against the frame Correct answer.
  4. Drive a wedge between the door and jamb at the latch and force the door inward

Explanation

An outswinging door must be forced in the direction it opens, so prying against the frame from the outside pushes the door away from the firefighter. The adz of a pick-head axe set in the gap provides that leverage. Forcing an outswinging door inward fights the door and the frame.

Question 28Fire Suppression and Emergency Response

During a working fire, a firefighter on the nozzle notices the smoke layer descending rapidly and darkening while heat at floor level increases sharply. Which action is most appropriate?

  1. Increase nozzle flow and advance deeper to reach the seat of the fire
  2. Open the ceiling above the fire room to release the accumulating heat
  3. Remain in position and continue the attack to cool the gases from below
  4. Withdraw toward the exit and notify the crew of deteriorating conditions Correct answer.

Explanation

A rapidly descending, darkening smoke layer with rising floor-level heat signals imminent flashover conditions. Firefighters should withdraw, communicate the changing conditions, and let the incident commander reassess the attack. Staying in place or advancing deeper exposes the crew to a flashover.

Question 29Fire Suppression and Emergency Response

A Houston engine company is assigned to establish a water supply at a fire in an area without a usable hydrant. Which source should the crew plan to use?

  1. A nearby static water source drafted through hard suction Correct answer.
  2. A closed hydrant on a parallel street
  3. A booster tank connection from a second engine only
  4. A garden hose connection to a residential spigot

Explanation

When no pressurized hydrant is available, a static source such as a pond, canal, or drafting pit is used with hard suction hose and the pump's draft capability. Houston's bayous and other open water are typical drafting sites. A closed hydrant or domestic spigot cannot supply fire flows.

Question 30Fire Suppression and Emergency Response

A firefighter is searching a smoke-filled apartment and reaches a closed door during the primary search. Which action is most appropriate before opening it?

  1. Kick the door open and immediately enter the room
  2. Leave the door closed and continue searching other areas
  3. Check the door and handle for heat and control the door while opening it Correct answer.
  4. Open the door fully to allow the search team to see into the room

Explanation

Before opening a door during a search, the firefighter should check the door and handle for heat and then open it in a controlled manner while staying to the side. This reveals fire conditions without exposing the crew to a sudden rush of heat and smoke. Uncontrolled opening can draw fire onto the search team.

Question 31Fire Suppression and Emergency Response

A firefighter is assigned to open a wall during overhaul to check for hidden fire. Which practice best supports this task?

  1. Use a thermal imager to identify hot spots and open at the indicated area Correct answer.
  2. Open the wall in large sections from the floor to the ceiling
  3. Spray water into the wall cavity before making any opening
  4. Wait until the next shift to check the wall for heat

Explanation

A thermal imager helps locate concealed hot spots so overhaul openings are targeted rather than random. Opening at the indicated area limits unnecessary damage while confirming whether fire has extended into the cavity. Blindly opening large sections wastes effort and may miss the actual fire location.

Question 32Fire Suppression and Emergency Response

A firefighter must raise a ground ladder to a window for rescue. Which placement consideration is most important?

  1. The ladder should be placed directly against the glass for stability
  2. The ladder should be angled at about 45 degrees to reduce the reach
  3. The ladder tip should extend slightly above the sill with the ladder angled about 75 degrees Correct answer.
  4. The ladder should be laid flat against the wall below the sill

Explanation

For rescue, the ladder tip should reach just above the sill so firefighters can enter and occupants can exit, and the ladder should be set at roughly a 75-degree angle for stability. Placing the tip at the sill or above it also gives a handhold during rescue. Improper angle or placement compromises stability and access.

Question 33Fire Suppression and Emergency Response

A firefighter is operating at a vehicle crash on a Houston freeway and must protect the scene from secondary collisions. Which practice is most appropriate?

  1. Position the apparatus to shield the scene and establish a taper with cones and flares Correct answer.
  2. Stand in the traffic lane to wave vehicles around the scene
  3. Turn off all emergency lighting to avoid distracting drivers
  4. Direct traffic personally without apparatus blocking

Explanation

Blocking with apparatus and setting a cone taper upstream of the scene gives drivers time to slow and move over. Emergency lighting should remain on to increase visibility. Firefighters should avoid standing in live traffic lanes.

Question 34Fire Suppression and Emergency Response

A firefighter encounters a hybrid vehicle with a high-voltage battery after a crash. Which action is most appropriate before beginning extrication?

  1. Spray the battery pack with water to cool it before cutting
  2. Cut the high-voltage orange cable to disable the system
  3. Identify the high-voltage components and avoid cutting or displacing them Correct answer.
  4. Assume the vehicle is de-energized once the engine stops

Explanation

High-voltage cables and battery packs should be identified and avoided during extrication because cutting them can cause shock, arc, or fire. The vehicle should be stabilized and the ignition shut down per department procedure, but responders should not assume the system is de-energized.

Question 35Fire Suppression and Emergency Response

A firefighter becomes disoriented inside a structure and cannot locate an exit. Which action is most appropriate?

  1. Activate the PASS device and follow a wall or hoseline to an exit Correct answer.
  2. Remain in place silently and wait for rescue
  3. Remove the facepiece to call for help more loudly
  4. Move quickly in a straight line to find an opening

Explanation

Activating the PASS device alerts other crews to the firefighter's location, and following a wall or hoseline provides a reliable path to an exit. Staying oriented and calm while broadcasting a mayday improves the chance of rescue. Removing the facepiece in a hazardous atmosphere is dangerous.

Question 36Fire Suppression and Emergency Response

A firefighter is evaluating a report of smoke in a large warehouse with no visible fire from the exterior. Which initial action is most appropriate?

  1. Open all exterior doors to ventilate before investigating
  2. Enter alone to locate the source quickly
  3. Establish command, investigate with a crew, and prepare a hoseline Correct answer.
  4. Assume the report is false and clear the call

Explanation

Smoke in a large commercial occupancy may indicate a concealed fire, so command should be established and the building investigated by a crew with a charged hoseline ready. Uncoordinated ventilation before locating the fire can spread smoke and feed a fire. A single firefighter should not enter alone.

Question 37Fire Suppression and Emergency Response

A firefighter must select a tool to force a padlock on a commercial gate. Which tool is most appropriate?

  1. A hose stream
  2. A thermal imager
  3. A pike pole
  4. A set of bolt cutters Correct answer.

Explanation

Bolt cutters are designed to shear the shackle of a padlock and are a standard forcible entry tool for locks. A pike pole is used for pulling and overhaul, and the other choices have no cutting application. Selecting the correct tool reduces time and damage.

Question 38Fire Suppression and Emergency Response

A firefighter is assigned to a well-involved room-and-contents fire in a single-family home with reports of occupants inside. Which factor most influences the choice between an interior attack and a defensive strategy?

  1. The extent of fire involvement and structural stability Correct answer.
  2. The time of day the fire started
  3. The number of apparatus on scene
  4. The color of the smoke leaving the structure

Explanation

The decision between offensive and defensive operations turns on the extent of fire involvement, structural condition, and whether a survivable environment exists for occupants and firefighters. A well-involved fire with compromised structure may require a defensive strategy despite reports of occupants. Smoke color and apparatus count are secondary considerations.

Question 39Fire Suppression and Emergency Response

A pump operator is supplying multiple attack lines and must maintain adequate nozzle pressure. Which action best supports this goal?

  1. Set pump discharge pressure based on the longest and highest-flow line Correct answer.
  2. Rely on the tank water only to simplify the supply
  3. Set a single low pressure for all lines to conserve water
  4. Reduce pressure whenever a second line is charged

Explanation

Pump discharge pressure must be set to satisfy the line with the greatest friction and elevation demand, usually the longest or highest-flow line, so every nozzle receives its design pressure. Reducing pressure when lines are added starves the nozzles. A reliable water supply is also needed to sustain multiple lines.

Question 40Fire Suppression and Emergency Response

A firefighter is tasked with cutting a ventilation opening in a flat roof. Which practice best supports fireground coordination?

  1. Cut several small holes to avoid structural damage
  2. Cut the opening before any attack line is in place
  3. Coordinate the cut with the interior attack and pull the ceiling after the cut Correct answer.
  4. Cut the opening on the upwind side of the fire

Explanation

Roof ventilation should be coordinated with the interior attack so the opening releases heat and smoke without drawing fire onto crews. After cutting, the ceiling is pulled to connect the opening to the fire area. Uncoordinated or premature cutting can worsen conditions for the attack team.

Question 41Firefighter Safety and Self-Survival

During interior firefighting, the primary purpose of a personal alert safety system (PASS) device is to:

  1. Record the firefighter's heart rate and body temperature for rehab monitoring
  2. Measure and display the firefighter's remaining air supply in minutes
  3. Sound a loud alarm if the firefighter becomes motionless for a preset period Correct answer.
  4. Track the firefighter's location inside the structure for the incident commander

Explanation

The PASS device activates a loud audible alarm when the firefighter stops moving for roughly 20 to 30 seconds, helping rescuers locate a downed or trapped member. It does not calculate air time, locate the wearer, or monitor vital signs.

Question 42Firefighter Safety and Self-Survival

A firefighter working in a immediately dangerous to life or health atmosphere must be on air from the SCBA. The practice of removing the facepiece regulator inside a burning structure is dangerous primarily because:

  1. The facepiece lens may fog and reduce visibility
  2. The firefighter loses respiratory protection against toxic smoke and superheated gases Correct answer.
  3. The SCBA harness may loosen when the regulator is disconnected
  4. The regulator may be damaged by heat and fail later at the scene

Explanation

Smoke from modern furnishings contains carbon monoxide, hydrogen cyanide, and other irritants, and the upper layer can exceed temperatures that scorch airways. Removing the regulator in an IDLH atmosphere exposes the firefighter to immediate respiratory and thermal injury.

Question 43Firefighter Safety and Self-Survival

While advancing a hoseline, a firefighter hears the low-air alarm activate. The correct immediate action is to:

  1. Wait in place and request that another crew bring a replacement cylinder
  2. Silence the alarm and increase the pace of the interior attack
  3. Continue the attack until the fire is knocked down, then exit
  4. Notify the officer and begin exiting the structure while following the hoseline Correct answer.

Explanation

The low-air alarm signals that the reserve capacity is being consumed, so the firefighter must inform the officer and start moving toward the exit. Following the hoseline provides a reliable path out under reduced visibility.

Question 44Firefighter Safety and Self-Survival

The two-out rule for interior structural firefighting requires that:

  1. Two rapid intervention team members enter with every attack crew
  2. Two officers supervise each attack line from the exterior
  3. Two firefighters remain outside and can initiate rescue of the interior crew Correct answer.
  4. Two water supply lines be established before entry

Explanation

The two-out provision requires that at least two firefighters be positioned outside, aware of the interior crew, and able to mount a rescue if needed. They are not required to enter with the attack crew.

Question 45Firefighter Safety and Self-Survival

A firefighter becomes disoriented in a large commercial building and cannot find a wall or hoseline. The recommended self-survival action is to:

  1. Remove the facepiece to shout for help more loudly
  2. Continue crawling in the direction of the heat until a doorway is found
  3. Stand upright to see farther through the smoke
  4. Activate the PASS device, stay low, and attempt to locate a wall to follow to an exit Correct answer.

Explanation

Activating the PASS device alerts other crews to the firefighter's location, and staying low keeps the member beneath the hot, toxic upper layer. Locating a wall provides a continuous reference that can lead to a door or window.

Question 46Firefighter Safety and Self-Survival

The primary hazard of a lightweight wood truss floor that has been exposed to fire for several minutes is:

  1. Reduced smoke production that improves visibility
  2. Gradual sagging that provides ample warning before collapse
  3. Increased friction that slows hose advancement
  4. Sudden catastrophic collapse with little warning Correct answer.

Explanation

Lightweight wood truss assemblies and their metal gusset plates fail quickly under fire exposure, and the floor can collapse with little or no visible warning. Firefighters must avoid operating beneath or above such assemblies once fire involvement is suspected.

Question 47Firefighter Safety and Self-Survival

When should a firefighter don full personal protective equipment including SCBA during a vehicle fire involving a hybrid or electric vehicle?

  1. Before fire attack, because battery fires can produce toxic and flammable gases Correct answer.
  2. Only after the high-voltage battery has been confirmed to be disconnected
  3. Only when the vehicle is inside a garage or other enclosed space
  4. After the fire is extinguished and overhaul begins

Explanation

Lithium-ion battery fires can release flammable and toxic gases, including hydrogen fluoride, and may reignite. Full PPE with SCBA is required from the start of the incident, not after disconnection or extinguishment.

Question 48Firefighter Safety and Self-Survival

A firefighter in full turnout gear should drink water during rehab primarily to:

  1. Increase the weight of the gear for better stability
  2. Replace fluids lost through sweating and reduce the risk of heat stress Correct answer.
  3. Speed the absorption of carbon monoxide by the blood
  4. Suppress the urge to cough from smoke exposure

Explanation

Firefighting in encapsulating gear causes heavy sweating and fluid loss, which impairs cardiovascular function and increases heat stress risk. Rehydration during rehab helps restore fluid balance and supports safe return to work.

Question 49Firefighter Safety and Self-Survival

A firefighter operating on a roof notices spongy, soft spots underfoot and smoke pushing from the seams. The correct action is to:

  1. Sit down to lower body weight and continue cutting the vent hole
  2. Continue vertical ventilation because the roof is already compromised
  3. Stomp on the soft area to test whether it will support weight
  4. Move to a sounder area, notify the officer, and consider abandoning the roof Correct answer.

Explanation

Spongy decking and smoke pushing through seams indicate that fire has weakened the roof structure and collapse may be imminent. The crew should relocate to a sound area and inform the officer so the roof can be abandoned.

Question 50Firefighter Safety and Self-Survival

During a Mayday, the phrase 'Mayday, Mayday, Mayday' should be followed immediately by:

  1. A full description of the fire conditions and building construction
  2. The estimated time remaining on the firefighter's air cylinder
  3. The firefighter's name, unit, location, and nature of the emergency Correct answer.
  4. The incident commander's name and the tactical channel assignment

Explanation

A Mayday transmission must be brief and convey who is in trouble, where they are, and what the problem is so rescuers can act. Identifying the member, unit, location, and emergency gives the IC the information needed to direct rescue.