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Here are real sample questions from our General Science practice tests. Each question comes with a detailed explanation so you understand the reasoning, not just the answer.
Everything you need to know about the GS subtest: what it covers, how it's timed, and what topics to prioritize.
Take a Free GS Practice TestThe ASVAB General Science (GS) subtest measures your knowledge of physical and biological sciences. It tests whether you can recall and apply high-school-level scientific concepts, not deep university-level theory. Think scientific vocabulary, basic principles, and real-world concept application.
The General Science section is one of nine subtests on the ASVAB. It evaluates your understanding of fundamental science: from biology and ecology to chemistry, physics, and earth science.
What GS is really testing is your ability to recall scientific vocabulary and apply basic concepts. You don't need to memorize complex formulas or understand advanced theory. If you paid attention in high school science classes, you already have a solid foundation. The key is filling in the gaps and building recall speed.
GS doesn't contribute to your AFQT score, but it feeds into several line scores (composite scores) that determine which military jobs you qualify for, including technical, medical, and skilled roles.
Here are real sample questions from our General Science practice tests. Each question comes with a detailed explanation so you understand the reasoning, not just the answer.
The number of questions and time limit depend on which version of the ASVAB you take.
| Format | Questions | Time Limit | Key Detail |
|---|---|---|---|
| CAT-ASVAB | 15 scored questions | 12 minutes | Adaptive: difficulty adjusts to your level |
| Paper & Pencil | 25 questions | 11 minutes | Fixed difficulty: same questions for everyone |
Note: These are the official format details as of 2026. Administration settings can evolve, so always confirm with your recruiter if you're unsure which version you'll take. Most enlistees take the CAT-ASVAB at MEPS.
The official description says "physical and biological sciences." Here's a practical breakdown of what that actually means for your study plan.
The largest topic area on GS. Focus on:
Chemistry and physics fundamentals:
Less frequent but still tested:
Process and reasoning skills:
GS covers a broad range of topics, but none go deeper than high-school level. The challenge is breadth, not depth. You need to recall facts from biology, chemistry, physics, and earth science. With focused review using flashcards and practice tests, most people improve their GS score within 2–4 weeks.
On the CAT-ASVAB (computerized version taken at MEPS), GS has 15 scored questions with a 12-minute time limit. On the paper-and-pencil ASVAB, there are 25 questions in 11 minutes. The CAT version is adaptive, meaning question difficulty adjusts based on your answers.
No. The AFQT is calculated from only four subtests: Arithmetic Reasoning (AR), Mathematics Knowledge (MK), Word Knowledge (WK), and Paragraph Comprehension (PC). However, GS contributes to several line scores (composite scores) that determine which military jobs (MOS) you qualify for.
No. Calculators are not allowed on any section of the ASVAB, including General Science. The math involved in GS questions is minimal. Most questions test your recall of scientific facts and concepts, not your ability to calculate.
Life science (biology, human body systems, ecology) and physical science (basic chemistry and physics) make up the majority of GS questions. Earth and space science appears less frequently but is still tested. Focus your study time on biology and chemistry first for the highest return.
Most people see meaningful improvement with 2–4 weeks of focused study, spending 30–45 minutes per day. Start with a diagnostic test to identify weak areas, then focus on high-yield topics like body systems, basic chemistry, and ecology. Use flashcards for vocabulary and practice tests to build speed.
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