Illinois Basic Operations Firefighter (BOF) State Exam
Preparation Guide 1&2 (2026–2027): Comprehensive
Practice Questions and Verified Correct Answers
Which of the following was not suggested for personnel protection with regard to dealing with
the chemical in question?
A. Keep upwind of the chemical.
B. Wear self-contained breathing apparatus.
C. Avoid bodily contact with the chemical.
D. Any chemical that may inadvertently contact the body should be washed off with large
amounts of alcohol. - Answer - D. Any chemical that may inadvertently contact the body should
be washed off with large amounts of alcohol.
If a container of ethylene oxide has been subjected to fire for a prolonged period of time, what is
the recommended distance for safe evacuation? - Answer - 5,000 feet
What dilution of ethylene oxide with water is required to effectively inhibit its flammability? -
Answer - 24: 1
Once ethylene oxide becomes contaminated, what kind of chemical process may occur that can
generate enough heat and pressure to rupture its containment? - Answer - Polymerization
13. Which of the following choices is not recognized as a symptom stemming from ethylene
oxide vapor exposure?
A. Eye irritation
B. Skin irritation or burns
,C. Irritation of the respiratory system
D. Loss of muscular function - Answer - C. Irritation of the respiratory system
16. Firefighters often apply a hose stream to the side of a building that is in close proximity to a
fire. What is the primary reason for conducting such an operation? - Answer - Radiant heat given
off by the neighboring fire may adversely affect the nearest wall. Without the coolant effect of
the hose stream, enough heat may be absorbed by an exposed surface to cause ignition and create
a separate blaze.
17. Frequently, people use an octopus wall outlet connection to maximize the number of
appliances that can be plugged into a single outlet. What would this be considered? - Answer -
Unsafe, because the excessive amount of current drawn through the outlet may exceed what it is
designed to handle. This may set the stage for wires to overheat or a short circuit to occur, thus
causing a fire within the partition.
18. What is the greatest danger aspect for someone using an aluminum ladder to install or realign
a rooftop antenna? - Answer - A potential electrical shock hazard is possible when in the vicinity
of power lines.
**Any kind of metal ladder poses an electrical hazard if it comes into contact with an energized
power line. Aluminum is a superb conductor. Choices A and B are incorrect. Choice D refers to a
problem associated with aluminum ladders. However, it is not considered a greater danger than
the prospect of electrocution.**
19. In the process of fighting a fire, your superior officer directs you to perform a different part
of the operation. If, because of the noise and commotion you do not fully hear or comprehend
what was said, what should you do? - Answer - Ask your commanding officer to repeat the
instruction.
**Problems that occur at the fire scene that hamper the efficiency of how a fire is handled are
normally attributed to poor communication among firefighters. If a direction is not fully
comprehended or clearly heard, it is better to have it repeated than to undertake action on your
own initiative. Effective teamwork is imperative for any kind of operation to be conducted
efficiently. The other choices run counter to this concept.**
,21. If someone's clothing were to catch on fire, what would be an appropriate thing to do? -
Answer - If it is a loose fitting garment, such as a jacket or coat, you should attempt to strip it
off.
What is the mission of the fire service? - Answer - To save lives and protect property
What NFPA standard establishes basic training criteria for Firefighter I and Firefighter II -
Answer - 1001
A ____ is a collection of rules enacted by law in a particular jurisdiction. - Answer - Code
Which of the following BEST describes the action first taken after an alert to the station? -
Answer - Dispatching of emergency services responders
What task may a telecommunications center be assigned during a progress report? - Answer -
Periodic time transmissions
Which of the following must be considered when deciding the size of a collapse zone? - Answer
- Type of building construction and safest location for personel
Which of the following best describes when SARS are used? - Answer - Confined space rescues
and technical rescue incidents
Which of the following SCBA components warns when the system is reaching 20-25 percent of
cylinder capacity? - Answer - End of service time indicators
When donning SCBA, all straps on the harness assembly and facepiece should be - Answer -
Fully extended
Which types of SCBA are tested every five years? - Answer - Steel and aluminum
, Which of the following types of rope is the only rope required to have a rope log? - Answer -
Life safety rope
Which part of the rope is used to tie a knot or hitch? - Answer - Working
Which type of knot can be used to secure a victim's hands or feet to drag the victim to safety? -
Answer - Handcuff
Once a search is complete, a firefighter should - Answer - Report promptly to the supervisor
What are the two objectives for a structural search? - Answer - Search for life; assess fire
conditions
In the acronym LUNAR, the A stands for - Answer - Assignment
Which of the following best describes the result of running a generator for a long period of time
without a load? - Answer - Will overheat and damage the generator.
Which rescue tool power source is typically powered by pumps? - Answer - Hydraulic
What stabilizing tool uses a system of at least three wedged posts between the ground and a
vehicle resting on its side or top? - Answer - Buttress tension system
Hybrid vehicles that use color coded wiring use ____ to mark high voltage wiring. - Answer -
Orange
When using a strut and buttress tension system, firefighters must ensure all parts have a safety
margin that is: - Answer - In excess of the weight being secured
Preparation Guide 1&2 (2026–2027): Comprehensive
Practice Questions and Verified Correct Answers
Which of the following was not suggested for personnel protection with regard to dealing with
the chemical in question?
A. Keep upwind of the chemical.
B. Wear self-contained breathing apparatus.
C. Avoid bodily contact with the chemical.
D. Any chemical that may inadvertently contact the body should be washed off with large
amounts of alcohol. - Answer - D. Any chemical that may inadvertently contact the body should
be washed off with large amounts of alcohol.
If a container of ethylene oxide has been subjected to fire for a prolonged period of time, what is
the recommended distance for safe evacuation? - Answer - 5,000 feet
What dilution of ethylene oxide with water is required to effectively inhibit its flammability? -
Answer - 24: 1
Once ethylene oxide becomes contaminated, what kind of chemical process may occur that can
generate enough heat and pressure to rupture its containment? - Answer - Polymerization
13. Which of the following choices is not recognized as a symptom stemming from ethylene
oxide vapor exposure?
A. Eye irritation
B. Skin irritation or burns
,C. Irritation of the respiratory system
D. Loss of muscular function - Answer - C. Irritation of the respiratory system
16. Firefighters often apply a hose stream to the side of a building that is in close proximity to a
fire. What is the primary reason for conducting such an operation? - Answer - Radiant heat given
off by the neighboring fire may adversely affect the nearest wall. Without the coolant effect of
the hose stream, enough heat may be absorbed by an exposed surface to cause ignition and create
a separate blaze.
17. Frequently, people use an octopus wall outlet connection to maximize the number of
appliances that can be plugged into a single outlet. What would this be considered? - Answer -
Unsafe, because the excessive amount of current drawn through the outlet may exceed what it is
designed to handle. This may set the stage for wires to overheat or a short circuit to occur, thus
causing a fire within the partition.
18. What is the greatest danger aspect for someone using an aluminum ladder to install or realign
a rooftop antenna? - Answer - A potential electrical shock hazard is possible when in the vicinity
of power lines.
**Any kind of metal ladder poses an electrical hazard if it comes into contact with an energized
power line. Aluminum is a superb conductor. Choices A and B are incorrect. Choice D refers to a
problem associated with aluminum ladders. However, it is not considered a greater danger than
the prospect of electrocution.**
19. In the process of fighting a fire, your superior officer directs you to perform a different part
of the operation. If, because of the noise and commotion you do not fully hear or comprehend
what was said, what should you do? - Answer - Ask your commanding officer to repeat the
instruction.
**Problems that occur at the fire scene that hamper the efficiency of how a fire is handled are
normally attributed to poor communication among firefighters. If a direction is not fully
comprehended or clearly heard, it is better to have it repeated than to undertake action on your
own initiative. Effective teamwork is imperative for any kind of operation to be conducted
efficiently. The other choices run counter to this concept.**
,21. If someone's clothing were to catch on fire, what would be an appropriate thing to do? -
Answer - If it is a loose fitting garment, such as a jacket or coat, you should attempt to strip it
off.
What is the mission of the fire service? - Answer - To save lives and protect property
What NFPA standard establishes basic training criteria for Firefighter I and Firefighter II -
Answer - 1001
A ____ is a collection of rules enacted by law in a particular jurisdiction. - Answer - Code
Which of the following BEST describes the action first taken after an alert to the station? -
Answer - Dispatching of emergency services responders
What task may a telecommunications center be assigned during a progress report? - Answer -
Periodic time transmissions
Which of the following must be considered when deciding the size of a collapse zone? - Answer
- Type of building construction and safest location for personel
Which of the following best describes when SARS are used? - Answer - Confined space rescues
and technical rescue incidents
Which of the following SCBA components warns when the system is reaching 20-25 percent of
cylinder capacity? - Answer - End of service time indicators
When donning SCBA, all straps on the harness assembly and facepiece should be - Answer -
Fully extended
Which types of SCBA are tested every five years? - Answer - Steel and aluminum
, Which of the following types of rope is the only rope required to have a rope log? - Answer -
Life safety rope
Which part of the rope is used to tie a knot or hitch? - Answer - Working
Which type of knot can be used to secure a victim's hands or feet to drag the victim to safety? -
Answer - Handcuff
Once a search is complete, a firefighter should - Answer - Report promptly to the supervisor
What are the two objectives for a structural search? - Answer - Search for life; assess fire
conditions
In the acronym LUNAR, the A stands for - Answer - Assignment
Which of the following best describes the result of running a generator for a long period of time
without a load? - Answer - Will overheat and damage the generator.
Which rescue tool power source is typically powered by pumps? - Answer - Hydraulic
What stabilizing tool uses a system of at least three wedged posts between the ground and a
vehicle resting on its side or top? - Answer - Buttress tension system
Hybrid vehicles that use color coded wiring use ____ to mark high voltage wiring. - Answer -
Orange
When using a strut and buttress tension system, firefighters must ensure all parts have a safety
margin that is: - Answer - In excess of the weight being secured
