# Free ASVAB Practice Tests

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Huge database of 668 multiple-choice questions, 135 math and algebra problems, and 754 flash cards to help you prepare for the ASVAB.
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Sample Practice Test Questions

General Science

__________ is caused by a lack of Vitamin C.

scurvy

Scurvy is a difficiency disease caused by a lack of Vitamin C in the diet.

General Science

Force is measured in newtons (N) with 1 N being the force required to impart an acceleration of:

1 m/s2 to a mass of 1 kg

Weight is a force that describes the attraction of gravity on an object. Force is measured in newtons (N) with 1 N being the force required to impart an acceleration of 1 m/s2 to a mass of 1 kg.

General Science

The respiratory and circulatory systems are similar in that they:

transport oxygen

Like the respiratory system, the circulatory system serves to transport oxygen throughout the body while removing carbon dioxide. In addition, the circulatory system transports nutrients from the digestive system.

Electronics Information

Capacitors are charged by what type of current?

direct

Capacitors store voltage and are used in circuits as temporary batteries. Capacitors are charged by DC current (AC current passes through a capacitor) and that stored charge can later be dissipated into the circuit as needed. Capacitors are often used to maintain power within a system when it is disconnected from its primary power source or to smooth out or filter voltage within a circuit.

Electronics Information

In metals, increasing the temperature typically _____________ conductivity.

decreases

All conductors have resistance and the amount of resistance varies with the element. Metals exhibit increased resistance (and, therefore, lower conductivity) as their temperature increases.

Mechanical Comprehension

Lisa lifts a 25 pound box from the floor onto a loading dock 4 ft. off the ground. Sam slides the same box along a ramp to move it up another 4 ft. onto a flatbed truck. Who has done more work?

They have done an equal amount of work

Work is force multiplied by distance. Because both Connie and Sam moved the same weight the same distance they have done an equal amount of work. Sam employed the mechnacial advantage of an inclined plane so he exerted less effort to do the work but the amount of work done was still the same.

Math Knowledge

Find the value of b:
5b + x = -1
-2b - 3x = -3

-$$\frac{6}{13}$$

You need to find the value of b so solve the first equation in terms of x:

5b + x = -1
x = -1 - 5b

then substitute the result (-1 - 5b) into the second equation:

-2b - 3(-1 - 5b) = -3
-2b + (-3 x -1) + (-3 x -5b) = -3
-2b + 3 + 15b = -3
-2b + 15b = -3 - 3
13b = -6
b = $$\frac{-6}{13}$$
b = -$$\frac{6}{13}$$

Electronics Information

The rate of flow of electrons per unit time is which of the following?

current

Current is the rate of flow of electrons per unit time and is measured in amperes (A). A coulomb (C) is the quantity of electricity conveyed in one second by a current of one ampere.

Arithmetic Reasoning

What is $$\frac{4}{6}$$ + $$\frac{4}{14}$$?

$$\frac{20}{21}$$

To add these fractions, first find the lowest common multiple of their denominators. The first few multiples of 6 are [6, 12, 18, 24, 30, 36, 42, 48, 54, 60] and the first few multiples of 14 are [14, 28, 42, 56, 70, 84, 98]. The first few multiples they share are [42, 84] making 42 the smallest multiple 6 and 14 share.

Next, convert the fractions so each denominator equals the lowest common multiple:

$$\frac{4 x 7}{6 x 7}$$ + $$\frac{4 x 3}{14 x 3}$$

$$\frac{28}{42}$$ + $$\frac{12}{42}$$

Now, because the fractions share a common denominator, you can add them:

$$\frac{28 + 12}{42}$$ = $$\frac{40}{42}$$ = $$\frac{20}{21}$$

Mechanical Comprehension

The principle of conservation of mechanical energy states that, as long as no other forces are applied, what will remain constant as an object falls?

total mechanical energy

As an object falls, its potential energy is converted into kinetic energy. The principle of conservation of mechanical energy states that, as long as no other forces are applied, total mechanical energy (PE + KE) of the object will remain constant at all points in its descent.