Skip to main content

ASVAB-SECTION-3 Real Exam Questions

ASVAB Section Three : Mechanical Comprehension

188 questions available · Page 1 of 19

Updated Exam DumpsVerified AnswersPass Guarantee

Get Complete Exam Dumps
Question 1 Single choice

Which of the following materials serves as a conductor?

  1. A

    Metal

  2. B

    Wood

  3. C

    Acrylic

  4. D

    Paper

Show answer and explanation

Correct answer: A

Question 2 Single choice

A 130-pound woman is wearing shoes with high heels that measure 1-inch square.

If the woman is standing on one heel, what psi does the heel exert as it rests on the ground? (Disregard atmospheric pressure from your calculations.)

  1. A

    130

  2. B

    65

  3. C

    260

  4. D

    11

Show answer and explanation

Correct answer: A

Explanation

Power = Force/Area.
P = 130/1 = 130.

Question 3 Single choice

If a force of 200 pounds is exerted over an area of 10-square inches, what's the psi?

  1. A

    10

  2. B

    15

  3. C

    20

  4. D

    200

Show answer and explanation

Correct answer: C

Explanation

You can calculate psi as Pressure = Force/Area. So, in this problem, P = 200/10 = 20.

Question 4 Single choice

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

  1. A

    near the skinny end

  2. B

    at the top

  3. C

    near the fat end

  4. D

    near the grip

Show answer and explanation

Correct answer: C

Explanation

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

Question 5 Single choice

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

  1. A

    12 inches

  2. B

    6 inches

  3. C

    24 inches

  4. D

    36 inches

Show answer and explanation

Correct answer: C

Explanation

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

Question 6 Single choice

Weight is directly proportional to the acceleration due to ___________.

  1. A

    friction

  2. B

    elastic recoil

  3. C

    viscous drag

  4. D

    gravity

Show answer and explanation

Correct answer: D

Explanation

Weight is not a fixed property of an object; it varies with location.
Your weight is slightly less at the North Pole than it is at the equator. Your weight is much less on the moon than on earth.
Everything weighs less where the acceleration due to gravity is smaller.
Weight is directly proportional to local acceleration due to gravity.

Question 7 Single choice

Water in an engine can cause damage in winter weather because __________.

  1. A

    it can vaporize

  2. B

    water expands when it freezes

  3. C

    ice is heavier than water

  4. D

    cold water creates more steam than warm water

Show answer and explanation

Correct answer: B

Explanation

Water expands when it freezes, possibly damaging engine components.

Question 8 Single choice

If you use a lever to lift a 200-pound weight with an effort of 40 pounds, with is the mechanical advantage?

  1. A

    4

  2. B

    0.2

  3. C

    8,000

  4. D

    5

Show answer and explanation

Correct answer: D

Explanation

Mechanical advantage = load/effort = 200/40 = 5

Question 9 Single choice

Springs used in machines are usually made of __________.

  1. A

    plastic

  2. B

    bronze

  3. C

    nylon fiber

  4. D

    steel

Show answer and explanation

Correct answer: D

Explanation

Machine springs are usually made of steel although sometimes they're made of brass or other metal alloys.

Question 10 Single choice

The mechanical advantage of a winch is the ratio of the radius of the crank to the radius of the
__________.

  1. A

    arm

  2. B

    lever

  3. C

    fulcrum

  4. D

    shaft

Show answer and explanation

Correct answer: D

Explanation

The principle of a winch is not much different from that of a lever.
Since the crank and the shaft turn together, the torque exerted by the effort (the force on the handle) must be equal to the torque exerted by the load (the tension in the rope). The mechanical advantage then is the ratio of the radius of the crank to the radius of the shaft.