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General Science (GS) Review

Knowledge of physical and biological sciences. It feeds the line scores used for job qualification.

  • 15 questions
  • 12 minutes
  • ~48 s per question
  • Line scores
  • No calculator
  • 12 lessons · 15 h
Start lesson 1Take a short testFlashcards

Lessons

12 lessons · 466 practice questions · 96 flashcards
  1. 01Scientific Method, Measurement and DataDesign and critique controlled experiments; identify hypotheses, independent/dependent and controlled variables; interpret measurement units, precision, error, data tables and basic graphs; compute rates, density, averages and percent change; choose cautious science conclusions.50 min32 questions8 cards
  2. 02Cells and Basic BiologyExplain cell theory and the features of prokaryotic/eukaryotic cells; match organelle functions; compare plant and animal cells; predict membrane transport and water balance; explain ATP, photosynthesis and aerobic respiration; distinguish cell division processes and levels of biological organization.55 min34 questions8 cards
  3. 03Genetics, Heredity and EvolutionExplain DNA, genes, alleles and chromosomes; apply base-pairing and protein-expression fundamentals; solve one- and two-gene inheritance probabilities; distinguish meiosis, mutation and variation; explain natural selection, drift, adaptation and evidence for evolution.65 min40 questions8 cards
  4. 04Human Body SystemsIdentify and compare eleven major human body systems; trace cardiac/pulmonary, digestive and urinary routes; explain organ functions, homeostatic feedback, basic immune defenses and physiological interactions; interpret multi-step ASVAB-style life-science problems.70 min40 questions8 cards
  5. 05EcologyInterpret ecological organization, trophic relationships and food-web arrows; analyze energy transfer and nutrient cycles; solve population and density problems; distinguish competition, predation, mutualism, invasive species, succession and pollution effects using scientific evidence.65 min40 questions8 cards
  6. 06Matter, Atoms and the Periodic TableClassify matter and phase changes, distinguish elements/compounds/mixtures, calculate density, solve atomic number/mass number/isotope/ion count problems, interpret chemical formulas, and use periodic table groups and broad trends to answer original ASVAB GS science problems.80 min40 questions8 cards
  7. 07Chemical Reactions, Acids and BasesRecognize reactants/products, reactions versus physical changes, and experimental evidence; balance equations by conservation of atoms; solve mass and coefficient ratios; interpret acids, bases, pH, indicators, neutralization, energy transfer, reaction rate, catalysis and safety using original GS-style examples.75 min40 questions8 cards
  8. 08Motion and ForcesExplain motion with distance, displacement, speed, velocity and acceleration; interpret motion graphs; solve constant-acceleration problems; use Newton’s laws, force diagrams, gravity, friction, momentum and circular motion to predict physical outcomes and eliminate misconceptions.85 min40 questions8 cards
  9. 09Energy, Heat and WavesDescribe kinetic, gravitational, elastic and other energy stores; apply conservation, work, power and efficiency; distinguish temperature from internal energy; classify conduction, convection and radiation; compare mechanical and electromagnetic waves; compute wave frequency, period, wavelength, echoes and basic light behavior.90 min40 questions8 cards
  10. 10Earth ScienceExplain internal Earth layers and Earth spheres; analyze plate tectonics, earthquakes, rock cycle, weathering/erosion, groundwater and water cycle; distinguish weather from climate, weather systems, tides and seasonal geometry; reason through original GS-style scenarios and simple calculations.85 min40 questions8 cards
  11. 11AstronomyExplain the solar-system hierarchy, planet classes, gravity and orbits, Earth rotation and seasonal geometry, lunar phases and eclipses, tides, minor bodies, stars, galaxy structure, light-years, telescopes and careful astronomical inference; solve original calculator-free GS-style questions.95 min40 questions8 cards
  12. 12Integrated Science ReviewSynthesize biology, chemistry, physical science and Earth/space science through original multi-domain scenarios; evaluate experiments and causal evidence; apply conservation and dimensional analysis; solve explanations and quantitative GS-style problems.110 min40 questions8 cards

General Science practice tests

6 tests · each 15 questions · 12 min · no question repeats between tests

Test1Test2Test3Test4Test5Test6

About this section

General Science checks your knowledge of life, physical, earth and space science. It is not part of the AFQT, but it feeds several service composite scores that help determine which jobs you qualify for.

The 12 lessons start with the scientific method, measurement and data. Life science follows with cells and basic biology, genetics, heredity and evolution, human body systems, and ecology. Physical science covers matter, atoms and the periodic table, chemical reactions, acids and bases, motion and forces, and energy, heat and waves. The category closes with earth science, astronomy and an integrated science review that mixes all of it.

If you are aiming at a technical or medical job, give this subject real study time. Even a few weeks of focused review can refresh facts you last saw in high school classes. Each lesson ends with a short lesson test.

Take it with you: the free app

The same 124 lessons, 6,516 questions and 82 timed practice tests on your phone, plus flashcards with spaced review and progress tracking. Free to download, and it works offline.

  • Works offline
  • Spaced-review flashcards
  • Progress for every subtest
  • Menus in 59 languages
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