ASVAB ASVAB Certifications ASVAB-SECTION-3 Questions & Answers

• Question 181:

  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-squareinch pressure (psi) on the bottom of the tank?

  A. 2 psi

  B. 4 psi

  C. 5 psi

  D. 7 psi

  Correct Answer: B

  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.

• Question 182:

  

  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?

  A. about 16 2/3

  B. 12

  C. about 1/3 more

  D. about 20

  Correct Answer: A

  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

• Question 183:

  The force produced when a boxer's hand hits a heavy bag and "bounces" off it is called __________.

  A. static electricity

  B. magnetism

  C. recoil

  D. gravity

  Correct Answer: C

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

• Question 184:

  Air weighs about 15 psi.

  What's the amount of pressure (force) exerted on the top of your head, given a surface area of 24 inches?

  A. 360 pounds

  B. 625 pounds

  C. 5/8 pound

  D. 180 pounds

  Correct Answer: A

  Power equals force divided by area in square inches (P = F⁄A). This formula can also be stated as F = A ×

  P.

  Substitute the known quantities. F = 15 × 24 = 360 pounds.

• Question 185:

  

  Looking at the figure above, when Cat B lands on the seesaw, Cat A will __________.

  A. remain stationary B. hit the ground hard

  C. rise in the air quickly

  D. enter the stratosphere

  Correct Answer: C

  Cat B landing on the seesaw will propel Cat A into the air.

• Question 186:

  

  The bottoms of four boxes are shown above. The boxes all have the same volume.

  If postal regulations state that the sides of a box must meet a minimum height, which box is most likely to be too short to go through the mail?

  A. NO. 4

  B. NO. 2

  C. NO. 1

  D. NO. 3

  Correct Answer: D

  The box with the largest area on the bottom will have the shortest sides. If length ?width ?height = volume,

  and all the boxes have equal volume, then the sides must be shortest on the box with the largest area on

  the bottom. Calculate the area of each box bottom: NO. 1 = 20 square inches; NO. 2 = 35 square inches;

  NO. 3 = 48 square inches; and NO. 4 = 27 square inches.

  NO. 3, which has the largest area, will have the shortest sides.

• Question 187:

  If a first class lever with a resistance arm measuring 2 feet and an effort arm measuring 8 feet are being used, what's the mechanical advantage?

  A. 2

  B. 4

  C. 6

  D. 1

  Correct Answer: B

  Mechanical advantage can be calculated as Length of Effort Arm ÷ Length of Resistance Arm. MA = 8 ÷ 2 = 4.

• Question 188:

  An induction clutch works by ___________.

  A. magnetism

  B. pneumatics

  C. hydraulics

  D. friction

  Correct Answer: A

  An induction clutch is a magnetic clutch.