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ASVAB Practice Questions

ASVAB General Science Practice Test Practice Questions

ASVAB General Science (GS) Subtest — Use this asvab general science practice test to review the science concepts most likely to show up on the GS subtest. These ASVAB science practice questions cover life science, earth and space science, chemistry, and physical science, with explanations that show the reasoning behind each answer.

15
Total Questions
12 minutes
Time Limit
No GS-only passing score
Passing Score
Free
Registration Fee

Free Sample Questions

Here are 5 free sample questions from our full bank of 480+ ASVAB General Science Practice Testpractice questions. Try them out below — click "Show Answer" to reveal the correct response and explanation.

1

Which cell structure is primarily responsible for producing ATP, the energy-carrying molecule used by most cells?

AA) Mitochondrion
BB) Ribosome
CC) Nucleus
DD) Cell membrane
2

What is the main reason Earth has seasons?

AA) Earth moves closer to and farther from the Sun during the year
BB) Earth's axis is tilted as it revolves around the Sun
CC) The Moon blocks different amounts of sunlight each month
DD) Earth's rotation slows down during winter
3

A rock sample has a mass of 120 grams and a volume of 40 cubic centimeters. What is its density?

AA) 0.33 g/cm3
BB) 40 g/cm3
CC) 3 g/cm3
DD) 160 g/cm3
4

In a neutral atom, the number of protons is equal to the number of:

AA) Neutrons
BB) Isotopes
CC) Nuclei
DD) Electrons
5

Which process most directly forms sedimentary rock from loose sediment?

AA) Compaction and cementation
BB) Melting and cooling
CC) Nuclear fusion
DD) Evaporation and condensation

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About the ASVAB General Science Practice Test

Format & Structure

Total Questions
15
Time Limit
12 minutes
Format
Multiple choice; CAT-ASVAB

Scoring & Cost

Passing Score
No GS-only passing score
Registration Fee
Free

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Frequently Asked Questions

What is the ASVAB General Science subtest?

General Science, often abbreviated GS, is the ASVAB subtest that checks basic science knowledge. It covers life science, earth and space science, chemistry, and physical science at roughly a high school survey level. The questions tend to be broad rather than deeply specialized, so a steady review of core concepts helps a lot.

How many questions are on ASVAB General Science?

The current CAT-ASVAB General Science subtest includes 15 scored questions, though some administrations may include tryout questions that do not count toward your score. The paper-and-pencil version commonly lists 25 General Science questions. Your testing site or recruiter can confirm which version you will take.

How much time do I get for ASVAB General Science?

On the CAT-ASVAB, the scored General Science section has a short time limit, so pacing matters. Official ASVAB materials list the CAT-ASVAB General Science time limit as 12 minutes without tryout questions, while the paper version is commonly listed at 11 minutes. That means you should practice answering straightforward science questions quickly and accurately.

Does General Science count toward my AFQT score?

No, General Science does not directly count toward the AFQT score used for basic enlistment eligibility. The AFQT is based on Arithmetic Reasoning, Mathematics Knowledge, Word Knowledge, and Paragraph Comprehension. General Science still matters because it can affect line scores for certain military jobs, especially technical or science-adjacent roles.

What topics should I study for ASVAB science practice questions?

Focus on the big foundations: cells, body systems, ecosystems, basic chemistry, forces and energy, Earth layers, weather, rocks, planets, and the Moon. You do not need college-level biology or physics for most questions. The best approach is to review one topic at a time, then answer mixed ASVAB science practice questions so you can switch between subjects smoothly.

Is ASVAB General Science hard?

It can feel tricky because the section jumps across several science areas in a small number of questions. One item might ask about atoms, and the next might ask about weather fronts or photosynthesis. If you have been away from science classes for a while, a focused review of common vocabulary and basic principles usually makes the section much more manageable.

How should I use an ASVAB General Science practice test?

Start by taking a short set without notes so you can see which science areas are rusty. Then review every explanation, including the questions you got right, because ASVAB science questions often test vocabulary and cause-and-effect relationships. After that, drill weak areas and return to mixed practice so your timing improves.

Can I use a calculator on ASVAB General Science?

No calculator is needed for most General Science questions, and calculators are not allowed on the ASVAB. Science items usually emphasize concepts more than computation. When math appears, it is typically simple arithmetic, formulas such as density, or unit reasoning that can be handled by hand.

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