National Science Bowl
The DOE National Science Bowl is a nationwide academic competition for middle and high school students. Questions include 11,722 toss-up and bonus questions from all 17 official high school practice sets released by the Department of Energy, covering subtopics from Molecular Biology, Organic Chemistry, and Genetics to Quantum Mechanics, Stellar Evolution, Calculus, Nuclear Energy, and dozens more.
▶ Biology 2,201 questions · 10 subtopics
Biology is one of the largest and most varied subjects in Science Bowl. Questions range from molecular mechanisms inside individual cells all the way up to ecosystems and evolutionary history. Expect a mix of conceptual questions ("what enzyme does X") and applied questions ("what would happen if Y were absent").
Molecular Biology & Development
Covers DNA replication, transcription, and translation — including the enzymes at each step and the roles of mRNA, tRNA, rRNA, and other RNA types. Expect questions on the genetic code, codon–anticodon relationships, and mRNA processing (5′ cap, poly-A tail, splicing). The developmental biology component covers embryonic germ layers (ectoderm, mesoderm, endoderm) and Hox genes.
Genetics, Heredity & Evolution
Tests classical and molecular genetics: Mendelian inheritance, sex-linked traits, and non-Mendelian patterns including pleiotropy, epistasis, and incomplete dominance. Hardy-Weinberg equilibrium appears frequently — know the conditions and how to calculate allele and genotype frequencies. Speciation mechanisms, evolutionary forces (natural selection, genetic drift, gene flow), and horizontal gene transfer (transformation, transduction, conjugation) also appear.
Neurophysiology & Endocrinology
Covers neurons (action potentials, ion channels, synaptic transmission, neurotransmitters) through to system-level function including the autonomic nervous system. The endocrinology component tests specific hormones — parathyroid hormone, LH, FSH, estrogen, progesterone, oxytocin, melatonin — and the feedback loops that regulate them. Thermoregulation and sleep-wake cycles also appear.
Organismal Systems & Physiology
Focuses on the major organ systems: cardiovascular (cardiac cycle, hemoglobin, blood types), respiratory (gas exchange, lung mechanics), musculoskeletal (muscle fiber types, sliding filament model), and digestive (organs, enzymes, nutrient absorption). Questions often ask about functional relationships between systems — for example, how the cardiovascular and respiratory systems coordinate during exercise.
Cell Biology & Organelles
Tests eukaryotic cell structure and function: the role of each organelle, vesicular trafficking, and the endomembrane system. Questions on receptor signaling (RTKs, GPCRs, second messengers) and the cell cycle (phases, checkpoints, cyclin-CDK complexes, apoptosis) are common. Prokaryotic vs. eukaryotic differences also appear.
Biochemical Pathways
Covers the major metabolic pathways — glycolysis, the Krebs cycle, oxidative phosphorylation, and fermentation — with emphasis on ATP yield, key molecules (NADH, FADH₂, pyruvate), and specific steps. Enzyme kinetics (Michaelis-Menten, Km, Vmax, competitive vs. noncompetitive inhibition) is another heavily tested area.
Taxonomy & Systematics
Tests classification across all domains and kingdoms, with emphasis on the major animal phyla (Porifera, Cnidaria, Platyhelminthes, Annelida, Mollusca, Arthropoda, Echinodermata, Chordata) and their distinguishing traits. Questions often focus on what defines a group — body symmetry, number of germ layers, coelom presence, and reproductive strategy. Plant taxonomy including monocots vs. dicots, bryophytes, and ferns also appears.
Plant Biology
Covers plant structure (roots, stems, leaves, xylem, phloem) and the mechanisms of photosynthesis — both the light-dependent reactions (photosystems I and II, ATP and NADPH production) and the Calvin cycle (RuBisCO, carbon fixation). Plant hormones — auxins, gibberellins, cytokinins, abscisic acid, and ethylene — and their specific effects are frequently tested.
Ecology & Population Biology
Covers trophic levels, food webs, energy flow (the 10% rule), biomes, and ecological succession. Population ecology tests growth models (exponential vs. logistic, carrying capacity) and interspecific interactions (competition, predation, mutualism, commensalism, parasitism).
Microbiology, Immunology & Pathogens
Tests bacterial structure (gram-positive vs. gram-negative), pathogenesis (endotoxins vs. exotoxins), and viral biology including the lytic vs. lysogenic cycle. The immune system section covers innate immunity (phagocytosis, complement, NK cells) and adaptive immunity (B cells, antibodies, T cells, MHC molecules, clonal selection).
▶ Chemistry 2,064 questions · 10 subtopics
Chemistry questions in Science Bowl span general chemistry, physical chemistry, and organic chemistry. Quantitative questions (involving calculations) are common alongside conceptual and nomenclature questions. A solid command of the periodic table — trends, groups, and element properties — is essential throughout.
Bonding, Structure & Coordination
Covers bond types (covalent, ionic, metallic) and intermolecular forces (hydrogen bonding, dipole-dipole, London dispersion), with VSEPR theory heavily tested — you need to predict molecular geometry and bond angles for a wide range of molecules. Hybridization (sp, sp², sp³) and coordination chemistry (ligands, coordination number, crystal field theory) also appear.
Atomic Structure & Quantum Theory
Tests the quantum mechanical model: quantum numbers (n, l, ml, ms), electron configurations (including exceptions like Cr and Cu), and the Pauli exclusion principle, Hund's rule, and aufbau principle. The Bohr model and hydrogen energy level calculations, wave-particle duality, and the Heisenberg uncertainty principle are also fair game.
Periodic Trends & Element Properties
Covers periodic trends — atomic radius, electronegativity, ionization energy, electron affinity, metallic character — and the ability to compare any two elements. Knowledge of specific element groups (alkali metals, halogens, noble gases, transition metals) and their characteristic properties is frequently tested, as are isotopes and average atomic mass calculations.
Solutions, Acids & Bases
Covers acid-base theory (Arrhenius, Brønsted-Lowry, Lewis), pH and pOH calculations, conjugate pairs, Ka and Kb, and buffer solutions. Solution chemistry includes molarity, colligative properties (boiling point elevation, freezing point depression, osmotic pressure), solubility rules, and net ionic equations.
Thermodynamics, Equilibrium & Kinetics
Thermodynamics questions cover enthalpy (Hess's law), entropy, and Gibbs free energy (ΔG = ΔH − TΔS) and the conditions for spontaneity. Equilibrium requires writing Kc/Kp expressions and applying Le Chatelier's principle; kinetics covers rate laws, reaction order, the Arrhenius equation, and activation energy.
Gas Laws & States of Matter
Covers the ideal gas law (PV = nRT) and the individual laws it encompasses (Boyle's, Charles's, Gay-Lussac's, Avogadro's), along with kinetic molecular theory and real gas deviations (van der Waals equation). Phase diagrams, intermolecular forces and their effect on boiling points, and Graham's law of effusion also appear.
Redox & Electrochemistry
Tests assigning oxidation states, identifying oxidizing and reducing agents, and balancing redox reactions by the half-reaction method. Electrochemical cells — galvanic vs. electrolytic, standard reduction potentials, cell voltage (E°cell = E°cathode − E°anode), and the Nernst equation — are heavily tested.
Spectroscopy & Analytical Techniques
Covers NMR (number of peaks, splitting patterns via the n+1 rule, chemical shift ranges), IR spectroscopy (functional group identification by absorption frequency), and mass spectrometry (molecular ion peak, fragmentation). UV-Vis spectroscopy also appears.
Organic Chemistry — Structure & Nomenclature
Covers IUPAC naming and structural features of organic molecules: alkanes, alkenes, alkynes, aromatic compounds, and the major functional groups (alcohols, aldehydes, ketones, carboxylic acids, esters, amines, amides). Stereochemistry — constitutional isomers, enantiomers, diastereomers, cis-trans isomers, chirality, and R/S designation — is frequently tested.
Organic Chemistry — Reactions & Polymers
Tests the mechanisms and products of major organic reactions: nucleophilic substitution (SN1 vs. SN2), elimination (E1 vs. E2, Zaitsev's rule), and electrophilic addition to alkenes. Named reactions (Diels-Alder, Grignard, Wittig) and polymer types — addition (polyethylene) vs. condensation (nylon, polyester) — also appear.
▶ Earth & Space 2,177 questions · 8 subtopics
Earth and Space is one of the broadest subjects, covering everything from the seafloor to the edge of the observable universe. Questions test both factual recall and conceptual understanding of Earth processes and astrophysical phenomena.
Solar System & Planetary Science
Tests properties of planets (size, mass, atmospheric composition, number of moons), the distinction between terrestrial and Jovian planets, and features of the asteroid belt, Kuiper belt, and Oort cloud. Orbital mechanics (Kepler's laws, aphelion/perihelion) and solar system formation are also standard topics.
Observational Astronomy, Exoplanets & Cosmology
Covers exoplanet detection methods (transit, radial velocity, direct imaging, microlensing) and telescope types across the electromagnetic spectrum. Hubble's law, dark matter and dark energy, gravitational lensing, and the Big Bang and cosmic microwave background are all commonly tested.
Stellar Evolution & Stellar Physics
The Hertzsprung-Russell diagram — what it plots and where specific stellar types appear — is a cornerstone of this subtopic. Stellar classification (O B A F G K M), evolution from protostar to white dwarf or supernova, nucleosynthesis (pp chain, CNO cycle), and compact objects (white dwarfs, neutron stars, black holes) all appear regularly.
Atmospheric Science & Weather
Covers the layers of Earth's atmosphere, global wind patterns (trade winds, westerlies, Coriolis effect), and ocean-atmosphere interactions. Weather systems — hurricanes, frontal systems, cyclones vs. anticyclones — are regularly tested, along with greenhouse gases, ozone chemistry, and the water cycle.
Oceanography
Covers ocean circulation — surface currents driven by wind and deep thermohaline circulation driven by density — and major ocean currents. Salinity, temperature, and density structure (thermocline, halocline), tidal forces, and ocean floor features (mid-ocean ridges, trenches) also appear.
Mineralogy, Petrology & Metamorphism
Covers mineral identification by physical properties (Mohs hardness, streak, luster, cleavage) and the three rock types (igneous, sedimentary, metamorphic) and the rock cycle. Igneous rocks are classified by silica content and grain size; metamorphic rocks by grade and index minerals (chlorite, biotite, garnet, staurolite, kyanite, sillimanite).
Geophysics & Tectonics
Plate tectonics is the core framework: the three boundary types (convergent, divergent, transform), their associated features, and evidence for plate motion (paleomagnetism, continental fit). Earth's interior layers, seismic waves (P-waves, S-waves, shadow zones), and the origin of Earth's magnetic field are also tested.
Surface Processes, Sedimentology & Paleontology
Covers physical, chemical, and biological weathering; erosion and sediment transport; and the formation of sedimentary rocks. Stratigraphic principles (superposition, cross-cutting relationships) and the geologic time scale are standard, as are fossil formation, index fossils, and major mass extinctions.
▶ Energy 1,294 questions · 10 subtopics
Energy is a DOE-specific subject with a broader and more applied focus than the other topics. Questions draw from physics, chemistry, biology, and engineering, all through the lens of energy production, storage, conversion, and policy. Many questions reflect current research areas and emerging technologies at DOE national laboratories.
Biochemistry, Metabolism & Bioenergy
Covers the major metabolic pathways (glycolysis, TCA cycle, oxidative phosphorylation) from an energy perspective — ATP yield, NADH/FADH₂ production, and energy storage. The bioenergy component covers photosynthesis, biofuels (cellulosic ethanol, biodiesel, biogas), and the challenges of lignocellulose conversion.
Life Sciences & Biomedicine
Covers molecular biology topics with relevance to DOE programs: DNA replication, gene expression, CRISPR-Cas9, genomics, and structural biology (protein folding, X-ray crystallography, cryo-EM). Questions often reflect the work of DOE's Joint Genome Institute and national labs.
Materials Science & Advanced Materials
Covers materials used in energy applications: semiconductors and doping, photovoltaic materials (perovskites, silicon), superconductors (Type I vs. Type II, BCS theory, Meissner effect), and advanced materials (graphene, carbon nanotubes, metal-organic frameworks). The relationship between atomic structure and macroscopic properties is a recurring theme.
Nuclear Energy & Reactors
Covers fission reactor components (moderators, control rods, coolants) and reactor types — BWR, PWR, breeder, and molten salt — and their comparative advantages. The uranium fuel cycle and nuclear fusion concepts (plasma confinement, tokamaks, ITER) are also tested.
Particle Physics & Cosmology
Covers the Standard Model (quarks, leptons, bosons), dark matter and dark energy, the Higgs boson, and antimatter. Major particle accelerators (LHC at CERN, Fermilab, RHIC) and cosmological observations (gravitational waves, CMB) also appear.
Quantum Mechanics & Spectroscopy
Covers quantum computing (qubits, superposition, entanglement, decoherence), quantum sensors, and spintronics. Spectroscopy techniques used in energy research — Raman, NMR, FRET, electron diffraction — and their applications in characterizing materials are also tested.
Catalysis & Chemical Engineering
Covers heterogeneous and homogeneous catalysis, the metals used in catalytic applications (platinum, palladium, ruthenium), and reaction engineering concepts (yield, selectivity). Carbon capture technologies and industrial processes (Haber-Bosch, steam methane reforming) also appear.
Energy Production & Sources
Tests knowledge of all major energy sources — fossil fuels, nuclear, and renewables (solar, wind, hydro, geothermal, tidal) — and how they compare by energy density, capacity factor, and carbon emissions. Biofuels and hydrogen as an energy carrier also appear.
Energy Efficiency, Grid & Policy
Covers electricity grid infrastructure (generation, transmission, distribution, transformers), smart grid technologies, and distributed generation. Building efficiency, LEED certification, and policy concepts (LCOE, capacity factor, net metering, renewable portfolio standards) also appear, as do energy unit conversions (joules, BTU, kWh, quads).
Batteries, Fuel Cells & Electrochemistry
Covers the major battery chemistries — lithium-ion (LiCoO₂/LiFePO₄ cathodes, graphite anode), lead-acid, and vanadium redox flow — and electrochemical concepts (Nernst equation, standard electrode potentials). Fuel cell types — PEM, solid oxide (SOFC), alkaline — their operating temperatures and efficiencies are also tested.
▶ Math 1,961 questions · 9 subtopics
Math in Science Bowl is mostly Short Answer requiring a numerical or exact symbolic answer, with some Multiple Choice questions. Speed and accuracy are critical — practice mental arithmetic and know your identities cold. Questions range from algebra to calculus.
Linear Equations & Systems
Covers solving linear equations and inequalities, systems of equations (substitution, elimination, matrix methods), and absolute value equations. Applications like direct, inverse, and joint variation also appear.
Polynomials & Algebraic Expressions
Tests factoring (GCF, difference of squares, sum/difference of cubes), the quadratic formula and discriminant, and the rational root theorem. Simplifying rational expressions, radical and rational exponents, and the behavior of polynomial functions (zeros, asymptotes) are common question types.
Functions, Sequences & Series
Covers function notation, composition (f(g(x))), inverse functions, and identifying even and odd functions. Arithmetic and geometric sequences and their series formulas are heavily tested, as are logarithm properties and the binomial theorem.
Geometry
Covers triangle properties (Pythagorean theorem, special right triangles 30-60-90 and 45-45-90), circles (arc length, sector area, inscribed angles), and solid geometry (surface area and volume of prisms, pyramids, cylinders, cones, spheres). Coordinate geometry including equations of circles, ellipses, parabolas, and hyperbolas is also tested.
Calculus
Tests differentiation (power, product, quotient, and chain rules; derivatives of trig, exponential, and log functions) and applications (extrema, related rates, L'Hôpital's rule, optimization). Integration covers antiderivatives, u-substitution, definite integrals, and the fundamental theorem of calculus.
Combinatorics, Probability & Statistics
Covers permutations (nPr), combinations (nCr), and inclusion-exclusion. Probability questions test conditional probability and expected value; statistics questions cover mean, median, standard deviation, and normal distributions.
Number Theory
Tests prime factorization, the Euclidean algorithm for GCD and LCM, divisibility rules, modular arithmetic, and number base conversions (binary, hexadecimal). Questions often require quick mental computation — finding GCDs or determining divisibility of large numbers.
Trigonometry
Covers the six trig functions and their values at standard angles, the unit circle, inverse functions, and solving trig equations. The Pythagorean identities, sum/difference and double-angle formulas, and the law of sines and cosines are all tested, as is radian-degree conversion.
Complex Numbers, Vectors & Matrices
Complex number questions cover arithmetic in standard form (a + bi), the modulus, and polar form. Vector operations (dot product, cross product, angle between vectors) and matrix operations (multiplication, determinants, inverses) are also tested.
▶ Physics 2,025 questions · 10 subtopics
Physics questions are a mix of conceptual understanding and quantitative calculation. You'll need to know core formulas and be able to apply them quickly. The subject spans classical mechanics, electricity and magnetism, waves and optics, and modern physics including quantum mechanics and nuclear physics.
Mechanics, Forces & Motion
Covers kinematics (the kinematic equations for constant acceleration), Newton's three laws, and common forces including gravity, friction, tension, and spring force. Projectile motion — treating horizontal and vertical components independently — is a frequent question type, as are free body diagrams and Atwood machines.
Work, Energy, Power & Momentum
The work-energy theorem, conservation of mechanical energy, and kinetic/potential energy formulas (½mv², mgh, ½kx²) are core topics. Momentum (p = mv), impulse, conservation of momentum in elastic vs. inelastic collisions, and power (P = W/t = Fv) are also heavily tested.
Circular Motion, Rotation & Gravitation
Covers centripetal acceleration and force, torque (τ = rF sinθ), angular momentum, and moment of inertia for common shapes. Kepler's three laws, Newton's law of universal gravitation, orbital velocity, and escape velocity are heavily tested.
Harmonic Motion & Fluids
Simple harmonic motion covers pendulums (T = 2π√(L/g)), mass-spring systems (T = 2π√(m/k)), and resonance. Fluid mechanics covers Archimedes' principle, Pascal's law, Bernoulli's equation, and the continuity equation.
Thermodynamics
Tests the zeroth, first, and second laws: heat, work, internal energy (ΔU = Q − W), specific heat, and entropy. Thermodynamic processes (isothermal, adiabatic, isobaric, isochoric) on PV diagrams, heat engines, and the Carnot efficiency limit (η = 1 − Tc/Th) are standard topics.
Electricity & Magnetism
Covers Coulomb's law, electric fields and potential, Gauss's law, and the Lorentz force on moving charges and current-carrying conductors. Electromagnetic induction — Faraday's law and Lenz's law — and Ampere's law are also heavily tested.
Electric Circuits & Current
Covers Ohm's law, Kirchhoff's laws, and series vs. parallel circuit analysis. Capacitors (energy stored, series/parallel behavior), RC time constants (τ = RC), and power dissipation (P = IV = I²R) are frequently tested.
Waves, Sound & Optics
Wave properties (wavelength, frequency, wave speed v = fλ), the Doppler effect, standing waves, and resonance in open and closed pipes are core topics. Optics covers Snell's law, total internal reflection, Young's double-slit interference, diffraction, and the lens/mirror equation (1/f = 1/do + 1/di).
Quantum Mechanics & Atomic Physics
Covers the photoelectric effect, blackbody radiation, wave-particle duality, and the Heisenberg uncertainty principle. The Bohr model of hydrogen — energy levels, emission and absorption spectra, the Rydberg formula, and the Balmer/Lyman/Paschen series — is heavily tested.
Nuclear & Particle Physics
Covers radioactive decay modes (alpha, beta, gamma) and how they change atomic number and mass, plus half-life calculations and the exponential decay law. Nuclear binding energy, fission, fusion, and the Standard Model (quarks, leptons, force-carrying bosons) also appear regularly.