OFAI Cheat Sheet 2026

The 30 highest-yield OFAI facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Look at the pattern: 3, 6, 12, 24, ___. What is the next number? → 48
2. All hazardous materials calls require Protective Equipment Level A. Firefighter Chen is responding to a hazmat call. What must be true? → Chen must use Level A equipment
3. A cylindrical water tank has a radius of 5 feet and a height of 10 feet. Using π ≈ 3.14, what is the approximate volume? → 785 cubic feet
4. All firefighters at Station 7 are certified in First Aid. Marcus is certified in First Aid. Which of the following conclusions is valid? → Marcus may or may not be a firefighter at Station 7
5. Which of the following sentences uses punctuation correctly? → We completed the training exercise; then, we returned to the station.
6. Looking at a building from directly above (bird's-eye view), a firefighter sees a room with an 'L' shape. What does this tell them about the room's floor plan? → The room is not rectangular and has an indented corner
7. Which simple machine is most like a firefighter's axe used for splitting? → Wedge
8. A cube is cut in half diagonally from one corner to the opposite corner. What shape are the two resulting cross-sections? → Rectangle
9. A fire hose discharges water at 100 PSI. If the nozzle elevation is raised by 10 feet, by approximately how much does nozzle pressure drop? → 4.33 PSI
10. Which of the following is typically represented in blue on a standard topographical or city map? → Water features like rivers and lakes
11. Which class of fire involves flammable liquids such as gasoline and oil? → Class B
12. A pulley system has 4 rope segments supporting a load. What is the mechanical advantage of this system? → 4
13. What effect does increasing temperature have on the pressure inside a sealed container of gas? → Pressure increases
14. You are facing south on 2nd Street and turn east on Mustang Ave. The next one-way street you will reach is _____________. → 3rd Street
15. On a floor plan, 1 inch equals 20 feet. A corridor measures 3.5 inches on the plan. How long is the actual corridor? → 70 feet
16. A fire engine pump is rated at 1,000 gallons per minute (GPM). If two hose lines each require 250 GPM, how many such lines can the pump fully supply? → 4
17. Which of the following 3D shapes has exactly 6 faces, 12 edges, and 8 vertices? → Cube
18. A gear with 20 teeth meshes with a gear with 10 teeth. If the larger gear rotates at 100 RPM, at what speed does the smaller gear rotate? → 200 RPM
19. According to the provided map, which of the following routes from Point A to Point B is the most efficient, considering one-way streets and a road closure? → East on Main St., then North on Third Ave.
20. A firefighter wearing full gear weighs 280 lbs. If the ladder can support a maximum of 300 lbs, how much additional weight can be safely carried up? → 20 lbs
21. Dispatch sends Engine 1 or Ladder 2 to every structure fire, but never both. Engine 1 was sent to the Pine Street fire. What can be concluded about Ladder 2? → Ladder 2 was not sent to Pine Street
22. Which of the following liquids has the highest specific gravity? → Kerosene
23. A fire station responded to 240 calls in the month of June. Of these calls, 3/8 were medical emergencies. How many calls were NOT medical emergencies? → 150
24. When planning a route for an emergency vehicle, which of the following map features is MOST critical to consider for determining the fastest response time? → Road classifications and traffic-control symbols
25. No firefighter can operate a ladder truck without a Class E license. Officer Park does not have a Class E license. What follows? → Officer Park cannot operate the ladder truck
26. A fire crew responds only if both Truck A and Truck B are available. Truck A is unavailable today. What can be concluded? → The crew will not respond today
27. A firefighter faces north, then makes a 180-degree turn, followed by a 90-degree turn to the right. Which direction is the firefighter now facing? → West
28. Which one of the following hose diameters is the largest? → 17/20 inches
29. A square room has a side length of 15 feet. What is the area of the room? → 225 sq ft
30. Heat transfer that occurs when hot air rises and cool air sinks is called: → Convection