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

ASVAB ASVAB-SECTION-3 Online Questions & Answers

• Question 111:

  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?

  A. 2 psi
  B. 4 psi
  C. 5 psi
  D. 7 psi
  B. 4 psi

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  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 112:

  If you drag a log across the road, one way to reduce the amount of force needed to pull it would be to ___________.

  

  A. use a thicker rope
  B. pull harder
  C. cross at an angle
  D. lubricate the road
  D. lubricate the road

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  If you drag a log across the road, one way to reduce the amount of force needed to pull it would be to lubricate the road.

  Two things contribute to the force needed to pull the log across the road: the weight (mass) of the log itself, and the friction between the log and the road.

  Lubricating the road will reduce the friction and therefore reduce the force needed to pull the log across the road.

• Question 113:

  What are the three components of a lever?

  A. Resistance arm and effort arm
  B. A point of origin and solid plane
  C. A wide plane, fulcrum, and effort arm
  D. Fulcrum, resistance arm, and effort arm
  D. Fulcrum, resistance arm, and effort arm

• Question 114:

  How can workers increase the mechanical advantage of pulley systems?

  A. Using longer stretches of rope.
  B. Using a higher platform for the load in need of lifting.
  C. Using additional pulleys to further distribute weight.
  D. Decreasing load size and weight.
  C. Using additional pulleys to further distribute weight.

• Question 115:

  

  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
  C. rise in the air quickly

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

• Question 116:

  A micrometer is used to measure ___________.

  A. small changes in temperature
  B. changes in psi
  C. thicknesses to a few thousandths of an inch
  D. objects invisible to the unaided eye
  C. thicknesses to a few thousandths of an inch

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  Micrometers measure very small but not microscopic objects.

• Question 117:

  To move a 400-pound crate from the floor of a warehouse to the bed of a truck 4-feet off the ground, the most efficient device to use is a __________.

  A. lever
  B. incline plane
  C. fixed pulley
  D. jackscrew
  B. incline plane

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  To move a heavy object a few feet in height, the incline plane is the most efficient device (of those listed) to use.

• Question 118:

  A block of steel has a density of 0.29 pounds per cubic inch.

  If the block has dimensions of 1 inch by 1 inch by 3 inches, what is its weight?

  A. 0.29 pounds
  B. 0.58 pounds
  C. 0.87 pounds
  D. 1.0 pounds
  C. 0.87 pounds

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  The volume of the block can be calculated by multiplying its length by its width by its height, or 1 times 1 times 3, which equals 2 cubic inches. The weight is the density multiplied by its volume, which is 3 cubic inches multiplied by 0.29 pounds per cubic inch, which equals 0.87 pounds.

• Question 119:

  If an object is in equilibrium, it is said to be __________.

  A. at rest
  B. moving
  C. at rest or moving at a constant speed and in a straight line
  D. moving upward only
  C. at rest or moving at a constant speed and in a straight line

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  An object in equilibrium may or may not be at rest. If two or more forces act, their effects may eliminate each other.

  When this condition of equilibrium is reached, there is no net force and the velocity does not change.

  Equilibrium is reached when the object is at rest or moving at a constant speed and in a straight line.

• Question 120:

  A pump is typically used to accomplish which of the following tasks?

  A. to clarify liquids
  B. to separate liquids
  C. to move liquids downhill
  D. to move liquids uphill
  D. to move liquids uphill

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  Pumps are not used to move liquids downhill because liquids will flow downhill by gravity. Also, pumps do not separate or clarify liquids; instead, they agitate and mix liquids.