OFAI OFAI - Firefighter Aptitude Test Ontario Mechanical Aptitude and Physical Sciences Questions and Answers 2

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?

Accepted Answer

200 RPM

Answer

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?

Accepted Answer

Class B

Answer

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?

Accepted Answer

Friction

Answer

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?

Accepted Answer

500 foot-pounds

Answer

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?

Accepted Answer

One-third

Answer

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.

OFAI - Firefighter Aptitude Test Ontario Practice Test

OFAI - Firefighter Aptitude Test Ontario Practice Test

OFAI OFAI - Firefighter Aptitude Test Ontario Mechanical Aptitude and Physical Sciences Questions and Answers 2