CBST CBST Mechanical Reasoning

Question 1

A gear with 20 teeth meshes with a gear with 10 teeth. If the smaller gear rotates at 60 RPM, how fast does the larger gear rotate?

Accepted Answer

30 RPM

Answer

60 RPM

Answer

120 RPM

Answer

90 RPM

Question 2

A lever has its fulcrum 2 feet from a 100-pound load. How much force is needed at the other end, 8 feet from the fulcrum, to lift the load?

Accepted Answer

25 pounds

Answer

50 pounds

Answer

100 pounds

Answer

200 pounds

Question 3

Water flows through a pipe that narrows from a 4-inch diameter to a 2-inch diameter. What happens to the water pressure in the narrower section?

Accepted Answer

It decreases

Answer

It increases

Answer

It stays the same

Answer

It reverses direction

Question 4

A pulley system uses 3 ropes supporting a load. Ignoring friction, how much force is required to lift a 300-pound object?

Accepted Answer

100 pounds

Answer

150 pounds

Answer

300 pounds

Answer

900 pounds

Question 5

Which type of wrench provides the most torque when loosening a very tight bolt?

Accepted Answer

A long-handled wrench

Answer

A short-handled wrench

Answer

An adjustable wrench

Answer

A box-end wrench

Question 6

Two balls of equal size but different weights are dropped from the same height in a vacuum. Which hits the ground first?

Accepted Answer

They hit at the same time

Answer

The heavier ball

Answer

The lighter ball

Answer

It depends on their shape