ASVAB ASVAB-SECTION-3 Online Practice Questions and Exam Preparation

ASVAB ASVAB-SECTION-3 Online Questions & Answers

• Question 131:

  An above-ground suburban water tank holds 540 gallons of water when full.

  If the tank starts out full and is drained at a rate of 60 gallons per minute, how many seconds will it take to empty out halfway?

  A. 54
  B. 240
  C. 270
  D. 480
  C. 270

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  540 gallons divided by 60 gallons a minute means that it takes nine minutes to drain the tank completely. Half of that time is 4.5 minutes; 4.5 multiplied by 60 seconds equals 270 seconds.

• Question 132:

  Another word or phrase for false gravity is __________.

  A. tension
  B. friction
  C. centrifugal force
  D. Newton's Law
  C. centrifugal force

• Question 133:

  If a mechanical device is reported to have an advantage of 2, what does this mean?

  A. The number "2" describes the effectiveness of the machine.
  B. This means the device allows users to complete twice the amount of work with the same amount of effort used to complete a task without assistance.
  C. The number refers to the speed of the device in question.
  D. This means that the device requires twice the amount of effort to complete the same amount of work.
  B. This means the device allows users to complete twice the amount of work with the same amount of effort used to complete a task without assistance.

• Question 134:

  

  For the fuel to travel from Reservoir A to Reservoir B, passing through Filters C and D on the way, which valves must be open?

  A. 1, 2, 4, and 8
  B. 1, 2, and 3
  C. 6, 7, and 8
  D. 4, 6, and 7
  A. 1, 2, 4, and 8

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  Opening Valves 1, 2, 4, and 8 allows the fuel to travel through the filters.

  Opening Valves 1, 2, and 3 doesn't allow the fuel to travel through the filters.

  Opening Valves 6, 7, and 9 doesn't allow the fuel to travel through the filters.

  Opening Valves 4, 6, and 7 will allow fuel to travel through the filters but not to Reservoir B.

• Question 135:

  

  If Gear 1 in the figure above makes 10 complete clockwise revolutions per minute, then __________.

  A. Gear 2 makes 2 clockwise revolutions per minute.
  B. Gear 3 makes 8 clockwise revolutions per minute.
  C. Gear 3 makes 30 clockwise revolutions per minute.
  D. Gear 3 makes 9 counterclockwise revolutions per minute.
  B. Gear 3 makes 8 clockwise revolutions per minute.

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  Gear 1 makes 10 clockwise revolutions per minute. Gear 2, which is half the size, makes 20 counterclockwise revolutions per minute. (The number of revolutions it makes is inversely proportional to its difference in size.)

  Gear 2 is half the size of Gear 1, so to determine the number of revolutions it makes, multiply the number of revolutions Gear 1 makes by the inverse of 1⁄2: 10 × 2⁄1 (or just 2) = 20.

  Gear 3 is 2.5 times the size of Gear 2. In other words, it is 5⁄2 the size of Gear 2.

  To determine the number of revolutions Gear 3 makes, multiply the inverse of 5⁄2 by the number of revolutions Gear 2 makes: 2⁄5 × 20. This can be stated as 20⁄1 (the number of revolutions Gear 2 makes per minute) × 2⁄5 (the fraction of

  revolutions Gear 3 makes) = 40⁄5 or 8 revolutions per minute.

• Question 136:

  A hydraulic jack performs the task of moving objects by __________.

  A. utilizing oil; because oil cannot be compressed, pressure is placed upon the oil, resulting in a lifting motion
  B. pressing together two interfacing parts to increase height
  C. using a pulley system to lift items
  D. using a corkscrew-like effect to function
  A. utilizing oil; because oil cannot be compressed, pressure is placed upon the oil, resulting in a lifting motion

• Question 137:

  

  The mechanical advantage of the block-and-tackle arrangement shown above is __________.

  A. 2
  B. 4
  C. 6
  D. 1
  A. 2

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  Because this block-and-tackle arrangement merely changes the direction of the pull, it has a mechanical advantage of only 2.

• Question 138:

  

  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
  D. NO. 3

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  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 139:

  When you heat water that is confined in a closed container so that the steam cannot escape, the pressure inside the container __________ and the temperature of the boiling water __________.

  A. increases, decreases
  B. increases, increases
  C. decreases, decreases
  D. decreases, increases
  B. increases, increases

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  Heating an enclosed container of boiling water increases the pressure of the water vapor (steam) inside the container and increases the temperature of the water.

• Question 140:

  Which of the following is not a type of simple machine?

  A. Pulley
  B. Spring
  C. Lever
  D. Screw
  B. Spring

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  The six types of simple machines are: pulley, lever, screw, wheel and axle, wedge, inclined plane.