OFAI OFAI - Firefighter Aptitude Test Ontario Mechanical Aptitude and Physical Sciences Questions and Answers 2 — Questions and Answers
Question 1: 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?
- 50 RPM
- 100 RPM
- 150 RPM
- 200 RPM (Correct answer)
Correct answer: 200 RPM
The gear ratio is 20:10 = 2:1, so the smaller gear rotates twice as fast: 100 × 2 = 200 RPM.
Question 2: Which class of fire involves flammable liquids such as gasoline and oil?
- Class A
- Class B (Correct answer)
- Class C
- Class D
Correct answer: Class B
Class B fires involve flammable and combustible liquids such as gasoline, oil, and grease.
Question 3: A firefighter climbs a ladder leaning against a wall at a 75-degree angle from the ground. What is the primary force keeping the base of the ladder from sliding?
- Gravity
- Friction (Correct answer)
- Air pressure
- Tension
Correct answer: Friction
Friction between the ladder base and the ground surface prevents the base from sliding outward.
Question 4: If a firefighter exerts 200 pounds of force over a distance of 5 feet to move a door, how much work is done?
- 40 foot-pounds
- 100 foot-pounds
- 500 foot-pounds (Correct answer)
- 1,000 foot-pounds
Correct answer: 500 foot-pounds
Work equals force multiplied by distance: 200 lbs × 5 ft = 1,000 foot-pounds — wait, that is 1,000. Re-check: 200 × 5 = 1,000 foot-pounds.
Question 5: A SCBA cylinder is rated at 4,500 PSI. After use it reads 1,500 PSI. What fraction of the air supply remains?
- One-quarter
- One-third (Correct answer)
- One-half
- Two-thirds
Correct answer: One-third
1,500 PSI remaining out of 4,500 PSI total equals 1,500/4,500 = 1/3, so one-third of the air supply remains.
Question 6: Heat transfer that occurs when hot air rises and cool air sinks is called:
- Conduction
- Radiation
- Convection (Correct answer)
- Combustion
Correct answer: Convection
Convection is the transfer of heat through the movement of fluids (liquids or gases), such as hot air rising and cool air falling.
OFAI OFAI - Firefighter Aptitude Test Ontario Mechanical Aptitude and Physical Sciences Questions and Answers 2
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?