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

ASVAB ASVAB-SECTION-3 Online Questions & Answers

• Question 121:

  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
  A. 360 pounds

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  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 122:

  A ramp is a device commonly used to aid in __________.

  A. lifting
  B. lowering weights
  C. high-efficiency situations
  D. loading
  A. lifting

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  A ramp is a device commonly used to aid in lifting. The ramp is an inclined plane.

  The work output of an inclined plane is the work that would have to be done to lift the load directly. The work input is the actual force exerted in pushing the load up the ramp times the length of the ramp.

  An ideal mechanical advantage of an inclined plane is equal to its length divided by its height.

• Question 123:

  An elevator is most similar to which of the following mechanical devices?

  A. a spring
  B. a hydraulic jet
  C. a lever
  D. a crane
  D. a crane

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  An elevator is simply a crane that raises and lowers people.

• Question 124:

  Kinetic energy is __________.

  A. energy stored in chemicals, such as in a battery.
  B. energy in moving electrons, as in an electric current.
  C. energy in a moving object.
  D. energy that can be released under certain conditions.
  C. energy in a moving object.

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  Kinetic energy is energy in a moving object.

  Energy stored in chemicals, such as in a battery, is chemical energy; energy in moving electrons, as in an electric current, is electric energy; and energy that can be released under certain conditions is potential energy.

• Question 125:

  

  With one complete revolution of the cable winch shown above, the load will move __________.

  A. 12 inches
  B. 6 inches
  C. 24 inches
  D. 36 inches
  C. 24 inches

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  One revolution of the winch will move the weight 24 inches, the circumference of the winch drum.

• Question 126:

  Using a runner gives you a mechanical advantage of ___________.

  A. 4
  B. 2
  C. 3
  D. 1
  B. 2

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  Using a runner (a single, moveable pulley) gives a mechanical advantage of 2.

• Question 127:

  Which of these statements about force is correct?

  A. The amount of force required to move an object depends on the frictional forces between the object and its surroundings and must be calculated entirely based on individual situations.
  B. The amount of force required to move an object does not depend on frictional conditions and cannot and will not exceed the weight of the object in question.
  C. The amount of force required to move an object depends only on the weight of the object in question.
  D. Force is best used in levered applications.
  A. The amount of force required to move an object depends on the frictional forces between the object and its surroundings and must be calculated entirely based on individual situations.

• Question 128:

  Which weight exerts more pull on the horizontal bar from which both weights hang by strings as shown?

  

  A. Block A
  B. Block B
  C. Both exert the same pull
  D. Insufficient information to solve this problem
  A. Block A

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  The string holding the 10-lb. weight exerts more pull on the bar. The fact that that string is longer does not change how much tension is on it due to the weight at its end.

• Question 129:

  

  In the figure above, assume the valves are all closed.

  To fill the tank, but to prevent it from filling entirely, which valves should be open?

  A. 1 and 2 only
  B. 1, 2, and 3 only
  C. 1, 2, and 4 only
  D. 1, 2, 3, and 5 only
  D. 1, 2, 3, and 5 only

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  Opening Valves 1 and 2 allows water to enter the tank. Opening Valves 3 and 5 prevents water from filling the tank entirely. Opening Valve 4 allows water to leave the tank.

• Question 130:

  In the diagram in question four, if the wheel on the left turns clockwise, which way will the wheel on the right turn?

  A. Clockwise
  B. Counterclockwise
  C. Counter-counterclockwise
  D. Unable to tell from the information given
  B. Counterclockwise

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  If the wheel on the left turns clockwise, the wheel on the right will turn counterclockwise.