AFCT Mechanical Aptitude 2

Question 1

A wheelbarrow is an example of which class of lever?

Accepted Answer

Second class

Answer

First class

Answer

Third class

Answer

It is not a lever

Question 2

If a 20-tooth gear drives a 60-tooth gear, what is the gear ratio?

Accepted Answer

1:3

Answer

3:1

Answer

1:2

Answer

2:1

Question 3

Which statement about friction is correct?

Accepted Answer

Static friction is generally greater than kinetic friction

Answer

Friction always acts in the direction of motion

Answer

Friction is independent of surface contact area

Answer

Smoother surfaces always have zero friction

Question 4

A spring scale reads 10 pounds when a box is hung from it. Pulled horizontally on a table, the scale reads 4 pounds to start sliding. What is the coefficient of static friction?

Accepted Answer

0.4

Answer

0.25

Answer

2.5

Answer

0.6

Question 5

What happens to mechanical advantage as an inclined plane's angle decreases (becomes more gradual)?

Accepted Answer

It increases

Answer

It decreases

Answer

It stays the same

Answer

It becomes zero

Question 6

A ball is thrown straight up into the air. At the highest point of its trajectory, what is its velocity?

Accepted Answer

Zero

Answer

Maximum

Answer

Equal to its initial velocity

Answer

Negative