ASVAB Mechanical Comprehension Practice Test 556784 Results

Your Results Global Average
Questions 5 5
Correct 0 3.46
Score 0% 69%

Review

1

Which of the following surfaces would have the highest coefficient of friction?

77% Answer Correctly

marble

steel

ice

concrete
Solution

Coefficient of friction (μ) represents how much two materials resist sliding across each other.  Smooth surfaces like ice have low coefficients of friction while rough surfaces like concrete have high μ.

2

Boyle's law defines the relationship between pressure and volume as:

57% Answer Correctly

\(\frac{P_1}{P_2} = {V_1}{V_2}\)

\(\frac{P_1}{P_2} = \frac{V_2}{V_1}\)

\({P_1}{P_2} = {V_1}{V_2}\)

\(\frac{P_1}{P_2} = \frac{V_1}{V_2}\)
Solution

Boyle's law states that "for a fixed amount of an ideal gas kept at a fixed temperature, pressure and volume are inversely proportional". Expressed as a formula, that's \(\frac{P_1}{P_2} = \frac{V_2}{V_1}\)

3

An object's resistance to changes in direction is known as:

82% Answer Correctly

kinetic energy

mass

weight

inertia
Solution

The more mass a substance has the more force is required to move it or to change its direction. This resistance to changes in direction is known as inertia.

4 If A = 2 ft. and the green box weighs 5 lbs. what is the torque acting on the A side of this lever?
74% Answer Correctly
10 ft⋅lb
0 ft⋅lb
40 ft⋅lb
5 ft⋅lb
Solution
For a lever, torque is weight x distance from the fulcrum which, in this case, is: 5 ft. x 2 lbs. = 10 ft⋅lb
5 A 270 lb. barrel is rolled up a 18 ft. ramp to a platform that's 2 ft. tall. What effort is required to move the barrel?
53% Answer Correctly
30 lbs.
32 lbs.
31.5 lbs.
60 lbs.
Solution

This problem describes an inclined plane and, for an inclined plane, the effort force multiplied by the effort distance equals the resistance force multipied by the resistance distance:

Fede = Frdr

Plugging in the variables from this problem yields:

Fe x 18 ft. = 270 lbs. x 2 ft.
Fe = \( \frac{540 ft⋅lb}{18 ft.} \) = 30 lbs.