ASVAB Section 3: Mechanical Comprehension Exam Questions and Answers (Page: 2)

QUESTION: 6

The force produced when a boxer’s hand hits a heavy bag and “bounces” off it is called ________.

static electricity
magnetism
recoil
gravity

Answer(s): C

Explanation:

Recoil occurs when an object producing a force is kicked back.

QUESTION: 7

In the figure above, if Gear 1 has 25 teeth and Gear 2 has 15 teeth, how many revolutions does Gear 2 make for every 10 revolutions Gear 1 makes?

about 162/3
12
about 1⁄3 more
about 20

Answer(s): A

Explanation:

To determine the answer, multiply the number of teeth Gear 1 has D and the number of revolutions it makes (R).
Divide that number by the number of teeth Gear 2 has D to determine the number of revolutions Gear 2 makes (r).
Because the gears are proportional, this formula will show you the ratio of teeth to revolutions.
r = DR/d
r = (25 × 10)/15
r = 250⁄15, or 1610⁄15, or 162/3

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QUESTION: 8

A cubic foot of water weighs about 62.5 pounds.
If an aquarium is 18 feet long, 10 feet deep, and 12 feet wide, what’s the approximate pounds-per-square-inch pressure (psi) on the bottom of the tank?

2 psi
4 psi
5 psi
7 psi

Answer(s): B

Explanation:

You can determine the pressure of all that water by multiplying the volume of the aquarium by the weight of the water. Volume = lwh.
The bottom of the tank is 18 feet long by 12 feet wide by 10 feet high for a total volume of 2,160 cubic feet (18× 12 × 10).
A cubic foot of water weighs approximately 62.5 pounds.
2,160 × 62.5 gives an approximate pressure on the bottom of the tank of about 135,000 pounds over the entire surface area.
The surface area of the bottom of the tank is length × width. 216 inches (18 feet × 12) × 144 inches (12 feet × 12) = 31,104.
Dividing the pressure of 135,000 by the number of square inches of surface area gives an approximate PSI of 4.

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