ASVAB Mechanical Comprehension Practice Test 586315 Results

	Your Results	Global Average
Questions	5	5
Correct	0	3.13
Score	0%	63%

Review

The standard unit of energy is the:

73% Answer Correctly

	Volt
	Joule
	Horsepower
	Watt

Solution

The Joule (J) is the standard unit of energy and has the unit \({kg \times m^2} \over s^2\).

2 A mass of air has a pressure of 15.0 psi and a volume of 75 ft.³. If the air is compressed to a new volume of 55 ft.³, what is the new pressure?

56% Answer Correctly

	10.2 psi
	20.5 psi
	18.4 psi
	30.7 psi

Solution

According to Boyle's Law, pressure and volume are inversely proportional:

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

In this problem, V₂ = 55 ft.³, V₁ = 75 ft.³ and P₁ = 15.0 psi. Solving for P₂:

P₂ = \( \frac{P_1}{\frac{V_2}{V_1}} \) = \( \frac{15.0 psi}{\frac{55 ft.^3}{75 ft.^3}} \) = 20.5 psi

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

57% Answer Correctly

	mechanics
	engineering
	physics
	aeronautics

Solution

Mechanics deals with motion and the forces that produce motion.

4 If A = 7 ft. and the green box weighs 25 lbs. what is the torque acting on the A side of this lever?

74% Answer Correctly

	175 ft⋅lb
	350 ft⋅lb
	525 ft⋅lb
	3 ft⋅lb

Solution

For a lever, torque is weight x distance from the fulcrum which, in this case, is: 25 ft. x 7 lbs. = 175 ft⋅lb

A box is resting on a smooth floor. Static friction is present:

60% Answer Correctly

	at all times
	if the coefficient of friction is greater than one
	only if normal force is present
	when an attempt is made to move the box

Solution

For any given surface, the coefficient of static friction is higher than the coefficient of kinetic friction. More force is required to initally get an object moving than is required to keep it moving. Additionally, static friction only arises in response to an attempt to move an object (overcome the normal force between it and the surface).