ASVAB Mechanical Comprehension Practice Test 263088 Results

Your Results Global Average
Questions 5 5
Correct 0 3.17
Score 0% 63%

Review

1

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

57% Answer Correctly

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

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

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

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

2

The science that deals with motion and the forces that produce motion is called which of the following?

57% Answer Correctly

aeronautics

engineering

mechanics

physics
Solution

Mechanics deals with motion and the forces that produce motion.

3 How much resistance could a 110 lb. effort force lift using a block and tackle pulley that has 10 ropes supporting the resistance?
81% Answer Correctly
1100 lbs.
1102 lbs.
1210 lbs.
1650 lbs.
Solution

The mechanical advantage (MA) of a block and tackle pulley is equal to the number of times the effort force changes direction. An easy way to count how many times the effort force changes direction is to count the number of ropes that support the resistance which, in this problem, is 10. With a MA of 10, a 110 lbs. effort force could lift 110 lbs. x 10 = 1100 lbs. resistance.

4

According to Boyle's law, for a fixed amount of gas kept at a fixed temperature, which of the following are inversely proportional?

63% Answer Correctly

volume, mass

pressure, volume

pressure, density

density, volume
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".

5 A = 8 ft., the green box weighs 25 lbs., and the blue box weighs 35 lbs. What does distance B need to be for this lever to balance?
65% Answer Correctly
1.9 ft.
5.71 ft.
0 ft.
3 ft.
Solution
In order for this lever to balance, the torque acting on side A must equal the torque acting on side B. Torque is weight x distance from the fulcrum which means that the following must be true for the lever to balance:

fAdA = fBdB

For this problem, the equation becomes:

25 lbs. x 8 ft. = 35 lbs. x dB

dB = \( \frac{25 \times 8 ft⋅lb}{35 lbs.} \) = \( \frac{200 ft⋅lb}{35 lbs.} \) = 5.71 ft.