General Science ASVAB Practice Test

Use the free General Science (GS) practice test above for instant scoring and answer explanations, then read on to sharpen your weak spots. General Science is one of the nine ASVAB subtests, and it covers biology and the human body, earth & space science, and the basics of chemistry and physics. It does not count toward your AFQT enlistment score, but it feeds the line scores that open the door to many technical, medical, and electronics military jobs. In short: GS won’t decide whether you can enlist, but it can decide which careers you qualify for.

What the General Science subtest covers

GS is broad but shallow. Most questions test whether you remember a core fact, not whether you can run a long calculation. The subtest draws from three big buckets:

• Life science (biology & the human body): cells and their parts, photosynthesis and respiration, genetics basics, the classification of living things, and the major body systems (circulatory, respiratory, digestive, nervous, skeletal).
• Earth & space science: the layers of the Earth, rocks and the water cycle, weather and the atmosphere, plate tectonics, and the solar system, planets, and stars.
• Physical science (chemistry & physics basics): atoms, elements and the periodic table, states of matter, simple chemical reactions, plus everyday physics like force, motion, energy, gravity, and simple machines.

Because the range is so wide, the smartest strategy is broad familiarity rather than deep mastery of any one topic.

Question count and time

General Science is one of the shorter subtests, so pacing is rarely the problem. The exact numbers depend on which version you take.

Remember: no calculator is allowed on the ASVAB, and scratch paper is provided. The full ASVAB has nine subtests total, so treat GS as a quick, high-recall section you can lock down with focused review.

Which jobs use your General Science score

Your AFQT decides whether you can enlist; your line scores (composites) decide what you can do. General Science shows up in composites tied to careers where science knowledge matters, such as:

• Medical and health roles (medics, corpsmen, lab and biomedical fields)
• Electronics and technical specialties that pair GS with math and electronics
• General and skilled-technical composites used across every branch

Each branch combines subtests differently, so the same GS score can help you in several directions at once. If you’re aiming at a science-heavy job, a strong GS result is a real advantage. You can see how it rolls up using the ASVAB line score calculator, and check what counts as a competitive number in our guide to what is a good ASVAB score.

How to study for General Science

Because GS rewards recall over calculation, short, frequent review beats marathon cram sessions. Try these:

1. Learn the vocabulary of each system. Know what a chloroplast, mitochondrion, artery, and neuron do. Definitions win more GS points than anything else.
2. Master a handful of processes. Photosynthesis, cellular respiration, the water cycle, and the states of matter show up often and are easy to review.
3. Memorize a few physics anchors. Force (F = ma), the six simple machines, and the basic forms of energy cover a lot of ground with little effort.
4. Skim, don’t cram. Ten minutes a day across biology, earth science, and physics keeps the broad material fresh right up to test day.
5. Practice with explanations. Use the quiz above and the General Science study guide so every miss turns into a fact you now own.

A worked General Science example

Here’s the kind of question you’ll face, with the reasoning laid out.

Which part of a plant cell captures light energy for photosynthesis? A) Nucleus B) Mitochondria C) Chloroplast D) Ribosome

Answer: C) Chloroplast. Chloroplasts contain chlorophyll, the green pigment that absorbs sunlight and uses it to turn carbon dioxide and water into glucose (food) and oxygen. It helps to eliminate the other choices by what they do: the nucleus stores the cell’s DNA, the mitochondria release energy through respiration (the reverse of photosynthesis), and ribosomes build proteins. On GS, that “know what each part does” logic lets you answer quickly and move on.

Next steps

Run the practice test above until your GS score is steady, then round out your prep. Drill the four AFQT subtests on the AFQT practice test, estimate your percentile with the ASVAB score calculator, and review any shaky topics in the General Science study guide. A little consistent effort here can quietly expand the list of jobs you qualify for.