CPS Mechanical Aptitude and Principles 5

Question 1

A pump must lift water to a higher floor. Doubling the height the water must be raised does what to the work required?

Accepted Answer

Doubles it

Answer

Work against gravity is proportional to height, so doubling the height doubles the work.

Question 2

Two ropes support a hanging load at equal angles. If the angle each rope makes with vertical increases, the tension in each rope does what?

Accepted Answer

Increases

Answer

Spreading the ropes to wider angles increases the tension each must carry to support the same load.

Question 3

A screw is essentially which simple machine wrapped around a cylinder?

Accepted Answer

An inclined plane

Answer

A screw is an inclined plane wrapped around a cylinder, forming its threads.

Question 4

When a moving fire truck brakes suddenly, loose equipment slides forward because of?

Accepted Answer

Inertia

Answer

Inertia keeps the equipment moving forward even as the truck decelerates.

Question 5

Which of these increases the friction between a ladder's feet and the ground?

Accepted Answer

Rubber feet

Answer

Rubber feet grip the surface and increase friction, helping prevent the ladder from slipping.

CPS Firefighter Test Practice Test