ASVAB MECHANICAL COMPREHENSION QUESTIONS EXAM

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ASVAB MECHANICAL COMPREHENSION QUESTIONS EXAM

QUESTIONS

Actual Qs and Ans - Expert-Verified Explanation -Guaranteed passing score -25 Questions and Answers

-Format: Multiple-choice / Flashcard

Question 1: A bicycle collides head-on with a large truck moving at the same speed.Following the collision, the bicycle and the truck stick together. Which of the two had the larger change in momentum?

• the bicycle
• the truck
• both had equal change
• none of the above

Answer:

• both had equal change

• Since the momentum is conserved, there is no change in speed due to the collision, and the

momentum of both remains the same.Question 2: The gain in kinetic energy if a 400-kilogram satellite moves from a distance of 3 × 106 meters above the surface of the Earth to a point 1.50 × 106 meters above the surface is _______ J. The mass of the Earth is 5.98 × 1024 kilograms and the radius of the Earth is 6.37x106 meters.

A. -1.7 × 109

B. 3.25 × 109

C. 1.7 × 109

D. -3.25 × 109

Answer:

B. 3.25 × 109

• K + (6.67 x 1011) (400) (5.96 x 10<24)/(6.37 x 106 + 3 x 106) = (6.67 x 10 -11) (400) (5.98 x

1024)/(6.37 x 106 + 1.5 x 106) or K = -3.25 x 109 J.Question 3: The graph of velocity versus time for an object with a constant negative acceleration would be

• a straight line with a positive slope.
• a straight line with a negative slope.
• a line curving upward with a positive slope.
• a line curving downward with a negative slope.

Answer:

• a straight line with a negative slope.

• Since acceleration is the time derivative of the velocity, the slope has to be constant and must also

be negative since the acceleration is constant and negative.

Question 4: A ball thrown vertically upward has an initial potential energy of

http://www.flashcardexchange.com/mycards/add/837691100 J and an initial kinetic energy of 700 J. At the top of the trajectory its energy in joules is

A. 100

B. 700

C. 800

D. 1,000.00

Answer:

C. 800

• At the top of the trajectory the ball stops and all the kinetic energy has already been converted to

potential energy. Thus the total energy is the sum of 100 and 700, or 800 J.Question 5: A simple pendulum has a frequency of oscillation f. In order to double f, the length of the pendulum should be

• increased by a factor of

2.

• decreased by a factor of

2.

• increased by a factor of

4.

• decreased by a factor of 4.

Answer:

• decreased by a factor of

4.

• Since the frequency of oscillation is inversely proportional to the square root of the length of the

pendulum, the length has to be decreased by a factor of 4 for the frequency to be doubled.Question 6: In the spur gear arrangement shown in the figure, the ratio of the number of teeth on the output gear (No) to the number of teeth on the input gear (Ni) is

• The speed ratio of the input and output gears is
• ½
• 2
• ¼
• 4

Answer:

• 2

• The speed ratio of input to output gears equals the mechanical advantage, which is the ratio No/Ni, or

2.Question 7: Two objects with different weights are dropped at the same moment from the top of the Leaning Tower of Pisa.

• Both objects hit the ground at the same time.
• The heavier object hits the ground first.

• The heavier object hits the ground last

Answer:

• Both objects hit the ground at the same time.

• The travel time depends on the height above ground and the acceleration of gravity, both of which

are the same for both objects.Question 8: A stone is tied to the end of a string and swings in a circular motion. If the speed of the stone is tripled, the centripetal force of the stone will become

• 3 times as great.
• 1/3 as much.
• 9 times as great.
• 1/9 as much.

Answer:

• 9 times as great.

• The centripetal force of the stone is proportional to the square of the velocity.

Question 9: The quantity 2 m/s2 is a measure of

• speed.
• acceleration.
• velocity.
• metric volume.

Answer:

• acceleration.

• The quantity 2 m/s2 can be thought of as 2 m/s per second; that is, speed per unit time, or

acceleration.