Free OFAI Situational and Technical Knowledge Questions and Answers — Questions and Answers
Question 1: Which of the following liquids has the highest explosive range?
- Gasoline
- Ethanol (Correct answer)
- Acetone
- Kerosene
Correct answer: Ethanol
Explanation: <br> Ethanol has the highest explosive range among the options provided. It forms explosive mixtures with air over a wide concentration range, making it highly flammable and prone to ignition. Understanding the properties of different fuels, including their explosive ranges, is crucial for firefighters to effectively manage fire incidents and ensure safety during firefighting operations.
Question 2: Which of the following liquids had the lowest vapor density?
- Gasoline
- Acetone
- Kerosene
- Ethanol (Correct answer)
Correct answer: Ethanol
Explanation: <br> Ethanol has the lowest vapor density among the options provided. Vapor density is a measure of a substance's weight compared to an equal volume of air, and substances with lower vapor density tend to evaporate more readily and form flammable vapor-air mixtures at lower concentrations. Understanding the vapor density of various liquids is essential for firefighters to assess fire hazards and determine appropriate firefighting strategies.
Question 3: Which of the following liquids has the highest specific gravity?
- Gasoline
- Acetone
- Kerosene (Correct answer)
- Ethanol
Correct answer: Kerosene
Explanation: <br> Kerosene typically has a higher specific gravity compared to the other liquids listed. Specific gravity is the density of a substance compared to the density of water. Substances with higher specific gravity sink in water. Understanding the specific gravity of different liquids is essential for firefighters as it helps them assess fire hazards and determine appropriate firefighting strategies, such as selecting the right extinguishing agents.
Question 4: Which of the following descriptions is correct?
- Class A Fires - Electrical
- Class B Fires - Flammable liquids, gases (Correct answer)
- Class C Fires - Combustible metals
- Class D Fires - Ordinary Combustibles
Correct answer: Class B Fires - Flammable liquids, gases
Explanation: <br> Class B fires involve flammable liquids and gases. These fires are characterized by substances such as gasoline, oil, grease, and propane. Understanding the classification of fires is essential for firefighters to determine the appropriate extinguishing agents and firefighting techniques required to safely and effectively extinguish different types of fires.
Question 5: Fires which involve such metals as sodium, magnesium, titanium, aluminum, and uranium are classified as _____________ fires.
- Class A
- Class B
- Class C
- Class D (Correct answer)
Correct answer: Class D
Explanation: <br> Class D fires involve combustible metals such as sodium, magnesium, titanium, aluminum, and uranium. These fires require specialized extinguishing agents and firefighting techniques due to the unique properties and challenges associated with combating metal fires. Understanding the classification of fires is crucial for firefighters to effectively respond to and extinguish different types of fire emergencies.
Question 6: You are using a full SCBA bottle containing 140 cubic feet of air. Your supervisor has informed you that a bell will sound when the tank is 1/4 full. When you hear the bell sound, you can assume that your tank has ____________ cubic feet of air remaining.
- 25.0
- 28.5
- 35.0 (Correct answer)
- 45.5
Correct answer: 35.0
Explanation: <br> If a full SCBA bottle contains 140 cubic feet of air and the bell sounds when the tank is 1/4 full, then the remaining air in the tank would be 3/4 of the total capacity. Therefore, 3/4 of 140 cubic feet is (3/4) * 140 = 105 cubic feet. To find out the remaining air when the tank is 1/4 full, we subtract 105 from the total capacity, which is 140. Thus, 140 - 105 = 35 cubic feet. This means that when the bell sounds, there are 35 cubic feet of air remaining in the tank.
Question 7: Which one of the following hose diameters is the largest?
- 17/20 inches (Correct answer)
- 3/4 inches
- 3/5 inches
- 8/10 inches
Correct answer: 17/20 inches
Explanation: <br> Hose diameter is typically expressed as a fraction of an inch. In this case, 17/20 inches is the largest fraction among the options provided, indicating the largest hose diameter. Therefore, option A, 17/20 inches, is the correct answer. This question evaluates technical knowledge by assessing the applicant's understanding of firefighting equipment, specifically hose diameters, which is crucial for effective fire suppression operations.
Question 8: John is a firefighter at a station having dinner with his crew. He overhears a more senior firefighter saying very negative things about the department's newly hired Fire Chief. John knows the senior firefighter hasn't even met the new Fire Chief yet and is basing his statements on rumors he's heard from his neighbors. John has known the Fire Chief for several years and knows these rumors aren't true. What is the best way for Firefighter John to handle this situation?
- John should share whatever accurate information he has about the Fire Chief with the crew members at the dinner table.
- John should talk to the senior firefighter privately about the rumors and tell him that they could be damaging to the Fire Chief. (Correct answer)
- John should tell the other crew members that the rumors aren't true and when the senior firefighters isn't around.
- John should tell the Fire Chief about the rumors the senior firefighter was spreading.
Correct answer: John should talk to the senior firefighter privately about the rumors and tell him that they could be damaging to the Fire Chief.
Explanation: <br> Confronting the senior firefighter privately allows John to address the issue without causing embarrassment or confrontation in front of the rest of the crew. It also gives John the opportunity to share any accurate information he has about the Fire Chief and express concern about the potential damage of spreading false rumors. This approach promotes professionalism and addresses the issue directly while maintaining respect for all involved parties.
Question 9: You are on duty with your crew and your engine pulls into a fast food restaurant parking lot to quickly buy lunch. While you walk up to the front door of the restaurant, you are approached by a citizen who complains that there are two of your children left in a vehicle without a parent or guardian in sight. You approach the vehicle and see that the children appear to be between 10 and 13 years of age and appear to be fine. It's a cloudy day, and the outside temperature is 65 degrees. How would you handle this situation?
- Enter the restaurant and have the workers announce that there are children in a vehicle who need assistance.
- Remind the citizen that you and your crew need to quickly purchase your food and get back into service and that you cannot assist.
- Have your crew members pick up your food and stay close to the vehicle until a parent or guardian returns. (Correct answer)
- Remove the children from the vehicle and immediately assess their health.
Correct answer: Have your crew members pick up your food and stay close to the vehicle until a parent or guardian returns.
Explanation: <br> Leaving children unattended in a vehicle can be dangerous, especially if the weather conditions are extreme. In this situation, the children appear to be unharmed, and the weather is not overly hot or cold. Option C allows the firefighters to maintain a presence near the vehicle while ensuring they can quickly return to service. They can monitor the situation and provide assistance if needed while respecting the urgency of their duties. If the situation escalates or the children show signs of distress, further action can be taken.
Question 10: You are off-duty helping a fellow firefighter work on a side job. He works as a part-time construction worker to bring in extra money for his family. You're on the job site with another 10 workers and you accidentally drop your hammer on the tile floor while walking through the newly remodeled bathroom. you discover that your hammer cracked the tile. You look around and discover that nobody else saw the accident. How would you handle this situation?
- Try to repair the broken tile, even though you don't have experience in this area.
- Find your friend and inform him about what happened and offer to pay for the damage. (Correct answer)
- Tell your friend that you noticed that the tile was cracked when you walked into the bathroom.
- Wait until the remodeling project is finished to say anything as it's likely that there will be more damage in the coming days.
Correct answer: Find your friend and inform him about what happened and offer to pay for the damage.
Explanation: <br> Option B demonstrates integrity and accountability. As a firefighter, honesty and responsibility are essential values, both on and off duty. Informing your friend about the accident and offering to pay for the damage shows respect for his property and professionalism in addressing the situation promptly. It also helps maintain trust and integrity within the team, fostering a positive working relationship.
Question 11: Firefighter Sam has worked as a firefighter for two years. She feels very confident about her duties as a firefighter in all aspects with the exception of medical assessments. She's worried that her lack of knowledge in this area may one day put the crew in a dangerous situation. She's mentioned to her fellow firefighters that she'd like additional training but has been told that there's not enough time to train in this area and it's best to just acquire this knowledge through on-the-job real-life experience with patients. How should Firefighter Sam handle this situation?
- Firefighter Sam shouldn't worry about her lack of knowledge in medical assessments and just carry on with her assigned duties.
- Firefighter Sam should keep her concerns to herself, so her crew feels confident in her skills, but read and study medical assessment literature in her spare time.
- Firefighter Sam should inform her captain that she needs additional training in this area and ask if she can train with other crew members who are more knowledgeable in hopes of maximizing her learning potential. (Correct answer)
- Firefighter Sam should tell the other crew members that she might have to leave any medical assessment responsibilities to them as she doesn't feel comfortable with her limited skills.
Correct answer: Firefighter Sam should inform her captain that she needs additional training in this area and ask if she can train with other crew members who are more knowledgeable in hopes of maximizing her learning potential.
Explanation: <br> It's essential for Firefighter Sam to address her concerns about her lack of knowledge in medical assessments. By informing her captain and requesting additional training opportunities, she shows initiative and a commitment to improving her skills for the safety of herself, her crew, and the community. Training with more experienced crew members can provide valuable hands-on experience and mentorship, helping her gain confidence and proficiency in medical assessments over time.
Free OFAI Situational and Technical Knowledge Questions and Answers
Which of the following liquids has the highest explosive range?