# Free ASVAB Practice Tests

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Sample Practice Test Questions

Electronics Information

Which of the following converts electrical energy into another form of energy in an electrical circuit?

A load is a source of resistance that converts electrical energy into another form of energy. The components of a microwave, for example, are loads that work together to convert household electricity into radation that can be used to quickly cook food.

Automotive Information

The steering __________ transfers the motion of the steering gear output shaft to the steering arms that turn the wheels.

The steering linkage is a system of pivots and connecting parts between the steering gear and the control arms. The steering linkage transfers the motion of the steering gear output shaft to the steering arms that turn the wheels.

Shop Information

You've bored a large hole in a piece of wood to insert a doorknob. Which of these tools would you use to smooth the edges of the hole?

rasp

Files consist of diagonal rows of fine teeth and are used for fine finishing work to smooth, polish, or shape objects. Rasps are files with larger teeth that are used for coarse finishing work. Both files and rasps are designed to be inserted into detachable handles.

Arithmetic Reasoning

Solve 2 + (5 + 2) ÷ 5 x 3 - 42

-9$$\frac{4}{5}$$

Use PEMDAS (Parentheses, Exponents, Multipy/Divide, Add/Subtract):

2 + (5 + 2) ÷ 5 x 3 - 42
P: 2 + (7) ÷ 5 x 3 - 42
E: 2 + 7 ÷ 5 x 3 - 16
MD: 2 + $$\frac{7}{5}$$ x 3 - 16
MD: 2 + $$\frac{21}{5}$$ - 16
AS: $$\frac{10}{5}$$ + $$\frac{21}{5}$$ - 16
AS: $$\frac{31}{5}$$ - 16
AS: $$\frac{31 - 80}{5}$$
$$\frac{-49}{5}$$
-9$$\frac{4}{5}$$

Mechanical Comprehension

The mechanical advantage of a wheel and axle is equal to the:

ratio of the diameters of the wheels

A wheel and axle uses two different diameter wheels mounted to a connecting axle. Force is applied to the larger wheel and large movements of this wheel result in small movements in the smaller wheel. Because a larger movement distance is being translated to a smaller distance, force is increased with a mechanical advantage equal to the ratio of the diameters of the wheels. An example of a wheel and axle is the steering wheel of a car.

Mechanical Comprehension

Gear ratio indicates which of the following about two connected gears?

The mechanical advantage (amount of change in speed or torque) of connected gears is proportional to the number of teeth each gear has. Called gear ratio, it's the ratio of the number of teeth on the larger gear to the number of teeth on the smaller gear.  For example, a gear with 12 teeth connected to a gear with 9 teeth would have a gear ratio of 4:3.

General Science

50°F is how many °C?

10

The formula to convert from F° to C° is:

$$C° = {5 \over 9} (F° - 32)$$

plugging in our values gives:

$$C° = {5 \over 9} (50 - 32)$$

$$C° = {5 \over 9} (18)$$

$$C° = {90 \over 9}$$

$$C° = 10$$

General Science

"For every action, there is an equal and opposite reaction." This describes which of Newton's laws of motion?

third

Newton's third law of motion states that For every action, there is an equal and opposite reaction. When an object exerts a force on another object, the second object exerts a force of equal magnitude in the opposite direction on the first object.

Mechanical Comprehension
If the handles of a wheelbarrow are 1.5 ft. from the wheel axle, how many pounds of force must you exert to lift the handles if it's carrying a 130 lbs. load concentrated at a point 0.5 ft. from the axle?
43.3
This problem describes a second-class lever and, for a second class lever, the effort force multiplied by the effort distance equals the resistance force multipied by the resistance distance: Fede = Frdr. In this problem we're looking for effort force:
$$F_e = \frac{F_r d_r}{d_e}$$
$$F_e = \frac{130 \times 0.5}{1.5}$$
$$F_e = \frac{65.0}{1.5}$$
$$F_e = 43.3$$
Mechanical Comprehension

A truck is using a rope to pull a car. Tension in the rope is greatest in which of the following places?

near the truck

Tension is a force that stretches or elongates something. When a cable or rope is used to pull an object, for example, it stretches internally as it accepts the weight that it's moving. Although tension is often treated as applying equally to all parts of a material, it's greater at the places where the material is under the most stress.