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

ASVAB ASVAB-SECTION-3 Online Questions & Answers

• Question 61:

  

  What effort must be used to lift a 30-pound cat (see the figure above) using a first-class lever? (Don't include the weight of the lever in your calculations.)

  A. 10 pounds
  B. 15 pounds
  C. 50 pounds
  D. 5 pounds
  A. 10 pounds

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  E stands for effort needed. 30 (weight of the cat) × 2 (length of resistance arm) = x × 6 (length of effort arm). Do a little multiplication, and you get 60 = 6x.

  To isolate x, divide each side by 6:

  60 ÷ 6 = 6x ÷ 6, or 10 = x.

• Question 62:

  Pliers are an example of a ___________.

  

  A. first-class lever
  B. second-class lever
  C. third-class lever
  D. fourth-class lever
  A. first-class lever

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  Pliers are an example of a first-class lever because the fulcrum is positioned between the effort (where your hand grips the pliers) and the load (the object that is being held or squeezed by the pliers).

• Question 63:

  

  If Gear 1 moves in a clockwise direction, which other gears also turn clockwise?

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

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  Gears with their teeth together in mesh turn in opposite directions. Gear 1 turns clockwise. Gear 2, in mesh with Gear 1, turns counterclockwise. Gear 3, in mesh with Gear 2, turns clockwise. Gear 4, in mesh with Gear 3, turns counterclockwise. Gear 5, in mesh with Gear 2, turns clockwise.

• Question 64:

  Normally, atmospheric pressure is approximately __________.

  A. 14.7 psi
  B. 23.2 psi
  C. 7.0 psi
  D. 10.1 psi
  A. 14.7 psi

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  "Normal" atmospheric pressure is 14.7 psi.

• Question 65:

  The center of gravity of a baseball bat would be best described as __________.

  A. near the skinny end
  B. at the top
  C. near the fat end
  D. near the grip
  C. near the fat end

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  The center of gravity is the place on an object where there is equal weight on either side.

• Question 66:

  What is the state known as equilibrium?

  A. Equilibrium describes the action of two similar forces coming together.
  B. Equilibrium describes the state in which two different items possess equal force, resulting in balance.
  C. Equilibrium describes the action of two opposing forces coming together in a crash.
  D. Equilibrium describes the state created by the coming together of parallel forces.
  B. Equilibrium describes the state in which two different items possess equal force, resulting in balance.

• Question 67:

  An "inclined plane" is a commonly used implement and has many applications, including handicap access.

  What is the most common name for an inclined plane?

  A. A pulley system
  B. A lever
  C. A ramp
  D. A series of gears
  C. A ramp

• Question 68:

  

  In the figure above, if the cogs move up the track at the same rate of speed, Cog A will __________.

  A. reach the top at the same time as Cog B
  B. reach the top after Cog B
  C. reach the top before Cog B
  D. have greater difficulty staying on track
  C. reach the top before Cog B

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  The larger cog (Cog A) covers a greater linear distance in a given period of time.

• Question 69:

  In the illustration below, if Pulley A is rotating in the direction indicated, then Pulley C will __________.

  

  A. rotate in the same direction as Pulley B
  B. rotate in the same direction as Pulleys A and B
  C. rotate in the opposite direction of Pulleys A and B
  D. rotate in the same direction as Pulley A
  D. rotate in the same direction as Pulley A

  ---

  Pulley C will rotate in the same direction as Pulley A.

  Pulley A causes Pulley B to rotate in the opposite direction from Pulley A, and Pulley B causes Pulley C to rotate in the opposite direction from Pulley B. Since there are only two directions of rotation available. Pulley C's direction of rotation is

  the same as Pulley A.

• Question 70:

  What weight (X) is needed to balance the two loads shown in the figure below?

  

  A. 15 lbs
  B. 10 lbs
  C. 5 lbs
  D. 7.5 lbs
  B. 10 lbs

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  For the weights to balance, the sum of the forces must balance.

  Therefore, (5 lbs × 8 ft) + (10 lbs × 4 ft) = X lbs × 8 ft or 40 lb-ft + 40 lb-ft = 8X lb-ft or X=10 lbs