Ecology Quiz: Climate, Energy and Oceans
Ecology quiz: greenhouse effect, CO2, the 3 Rs, renewable energy, the ozone layer, the Paris climate deal, biodiversity, deforestation, oceans and composting.
Science quizzes
Physics, chemistry, biology, astronomy
The Science theme brings together the main disciplines that explain the world: physics, chemistry, biology and astronomy, along with geology and medicine. You will meet figures such as Galileo, Newton, Marie Curie, Pasteur and Einstein, discoveries like gravity, radioactivity, penicillin and the structure of DNA, and basic notions such as atoms, energy, cells and the solar system.
Science quizzes test both general scientific knowledge and reasoning, with questions on the experimental method, units of measurement and great inventions. You can play without paying: each quiz has five difficulty levels from very easy to expert, and a short comment explaining every answer.
Subthemes
Quizzes
MediumAstronomy
Astronomy Quiz: Planets, Stars and Great Telescopes
Astronomy quiz: solar system planets, the Moon, stars, black holes, Galileo, Kepler, Hubble, James Webb and exoplanets. Test your space knowledge.
ExpertEcology & Environment
Expert Ecology Quiz: Milankovitch, Gaia, Tragedy of the Commons
Expert ecology quiz: Milankovitch cycles, CO2 warming calculated in 1896, The Tragedy of the Commons, Gaia and the Brundtland Report.
Hard Ecology Quiz: Wetlands Convention, IPCC, CITES and Mangroves
A hard ecology quiz: the wetlands convention, the IPCC's creation year, nitrate and phosphate pollution, what CITES regulates and mangroves.
MediumEcology & Environment
Ecology Quiz: Acid Rain, Ozone Layer, Rio and Paris (Intermediate)
Intermediate ecology quiz: acid rain pollutants, ozone-depleting compounds, the Rio Earth Summit, the Kyoto adoption year and the Paris Agreement talks.
Ecology & Environment Quiz: Methane, Kyoto and Coral Bleaching (Easy)
Easy ecology quiz: the greenhouse gas from livestock, the Kyoto Protocol, photosynthesis by-products, geothermal energy and coral bleaching.
Very easyEcology & Environment
Ecology & Environment Quiz: CO2, Renewables and Recycling (Very Easy)
A very easy ecology quiz: the greenhouse gas from fossil fuels, a renewable energy, photosynthesis, the largest rainforest and the 3Rs rule. 10 questions.
ExpertGeology & Volcanoes
Expert Geology & Volcanoes Quiz: Inner Core, Tambora, Mesozoic Periods
Expert geology quiz: the mantle-core boundary, the solid inner core's discoverer, Tambora's 1815 eruption, peridotite's mineral and the Mesozoic periods.
ExpertComputing & Technology
Expert Computer Science Quiz: RSA, Binary Search, Knuth, Unix
Expert computer science quiz on the RSA inventors, binary search complexity, The Art of Computer Programming, Ruby's creator and Unix's birthplace.
Hard Geology & Volcanoes Quiz: Moho, Seismic Waves, Krakatoa 1883
A hard geology quiz: the crust-mantle boundary, number 1 on the Mohs scale, the first seismic waves, the great Krakatoa eruption and the liquid core.
Hard Computer Science Quiz: Early Programmers, C, IPv4, Turing Test
A hard computer science quiz: the first programmer, the Internet's ancestor, the lab behind C, IPv4 address size and the imitation game. 10 questions.
MediumGeology & Volcanoes
Geology & Volcanoes Quiz: Quartz, Mantle and Marble (Intermediate)
Intermediate geology quiz: what quartz is made of, the layer between crust and core, the seismograph, how marble forms and where new oceanic crust appears.
MediumComputing & Technology
Computer Science Quiz: Web, Linux, SQL and Binary (Intermediate)
Intermediate computer science quiz: the inventor of the World Wide Web, the Linux kernel's creator, SQL, binary 1010 and the S of HTTPS. 10 questions.
Geology & Volcanoes Quiz: Rock Types, Pangaea, Mohs Scale (Easy)
Easy geology quiz: main rock types, the earthquake magnitude scale, underground molten rock, an ancient supercontinent and the hardest mineral.
Computer Science Quiz: Microsoft, HTML, CPU and Bytes (Easy)
Easy computer science quiz: who founded Microsoft with Paul Allen, a snake-named language, what HTML does, the CPU acronym and bits in a byte.
Very easyGeology & Volcanoes
Geology & Volcanoes Quiz: Lava, Earthquakes and Craters (Very Easy)
A very easy geology quiz: molten rock flowing from a volcano, moving plates and earthquakes, what a rock is, the Earth's core and a volcano's opening.
Very easyComputing & Technology
Computer Science Quiz: iPhone, Browsers and USB (Very Easy)
A very easy computer quiz: the cursor device, the maker of the iPhone, web browsers, where the @ symbol is used and what USB stands for. 10 free questions.
ExpertMathematics
Expert Math Quiz: Fermat's Last Theorem, Poincaré, Golden Ratio
Expert math quiz: the proof of Fermat's Last Theorem, the Poincaré conjecture, Platonic solids, Euler's formula for polyhedra and the golden ratio.
HardMathematics
Hard Math Quiz: Derivatives, Logarithms and Euler's Identity
A hard math quiz on a derivative, a base-10 logarithm, summing 1 to 100, the diagonals of a hexagon and Euler's famous identity. 10 questions.
MediumMathematics
Math Quiz: Pi, Equations, Factorials, Right Triangles (Intermediate)
Intermediate math quiz: the value of pi, a first-degree equation, a circle's area, a factorial and the hypotenuse of a 3-4 right triangle. 10 questions.
EasyMathematics
Math Quiz: Perimeter, Powers and Square Roots (Easy)
Easy math quiz on a square's perimeter, powers of 2, the sum of a triangle's angles, the square root of 144 and spotting a prime number. 10 questions.
Very easyMathematics
Math Quiz: Addition, Times Tables and Basic Shapes (Very Easy)
Very easy math quiz of mental arithmetic: an addition, a multiplication, a subtraction, half of 50 and the sides of a triangle. 10 free questions.
MediumMedicine & Human Body
Medicine Quiz: Hemoglobin, Pasteur, Scurvy and X-Rays (Intermediate)
Intermediate medicine quiz: the oxygen-binding blood protein, Pasteur's 1885 vaccine, the smallest bone, the scurvy vitamin and the discovery of X-rays.
ExpertMedicine & Human Body
Expert Medicine Quiz: Insulin 1921, Photo 51, Melatonin, Myelin
Expert medicine quiz: the inner ear's hearing structure, the pineal gland's hormone, insulin's 1921 co-discoverer, Rosalind Franklin's Photo 51 and myelin.
Hard Medicine & Body Quiz: Circulation 1628, Koch 1882, Blood Groups
A hard medicine quiz: blood circulation described in 1628, Koch's 1882 bacterium, antibody-making cells, a long cranial nerve and the A, B, O blood groups.
Medicine & Human Body Quiz: Penicillin, Insulin, Vaccines (Easy)
Easy medicine quiz: ABO blood groups, the 1928 penicillin discovery, the insulin organ, the bone protecting the brain and the first smallpox vaccine.
Very easyMedicine & Human Body
Human Body Quiz: Heart, Lungs, Bones and Brain (Very Easy)
A very easy human body quiz: the organ pumping blood, the breathing organs, an adult's bone count, the thinking organ and the largest organ. 10 questions.
ExpertAstronomy
Expert Astronomy Quiz: White Dwarfs, Hawking Radiation, Cosmology
Expert astronomy quiz: a white dwarf's mass limit, black hole radiation predicted in 1974, standard-candle supernovae and a rival theory to the Big Bang.
HardAstronomy
Hard Astronomy Quiz: Expanding Universe, Black Holes, Big Bang
A hard astronomy quiz on accelerating expansion, galaxies moving apart in 1929, black holes, the 1965 radiation and gravitational waves. 10 questions.
MediumAstronomy
Astronomy Quiz: Heliocentrism and Galaxies (Intermediate)
Intermediate astronomy quiz: the 16th-century heliocentric model, the region beyond Neptune, collapsed stars, a galactic collision and planetary laws.
EasyAstronomy
Astronomy Quiz: Moon Landing, Pluto and Auroras (Easy)
Easy astronomy quiz on the first Moon walk in 1969, Earth's rocky neighbor, Pluto's status since 2006, Jupiter's moons and polar auroras. 10 questions.
Very easyAstronomy
Astronomy Quiz: Sun, Moon and Planets (Very Easy)
Very easy astronomy quiz: the star at the heart of our solar system, the planet nearest to it, the Moon and tides, constellations and ringed planets. Free.
ExpertBiology
Expert Biology Quiz: CRISPR, Epigenetics and Endosymbiosis
Expert biology quiz on gene regulation without DNA change, the CRISPR-Cas9 system, the origin of mitochondria, chromosome ends and programmed cell death.
HardBiology
Hard Biology Quiz: DNA Replication, Gametes and Selection
A hard biology quiz on gamete production, the enzyme unwinding DNA, the 1953 double helix, extreme-trait selection and chlorophyll in plants. 10 questions.
MediumBiology
Biology Quiz: Cell Energy, Hormones and Immunity (Intermediate)
Intermediate biology quiz: how cells make energy from glucose, the vertebrate skeleton, sexual reproduction, the thyroid and antibody-making immune cells.
EasyBiology
Biology Quiz: DNA, Cells and Blood Types (Easy)
Easy biology quiz: the molecule of genetic information, cells without a nucleus, the cell's powerhouse, universal blood donors and cell division.
Very easyBiology
Biology Quiz: Organs, Spiders and Amphibians (Very Easy)
A very easy biology quiz: which organ lets us breathe, a spider's legs, the largest mammal, the organ we think with and frogs. 10 free questions.
ExpertPhysics & Chemistry
Expert Physics & Chemistry Quiz: Schrödinger, Pauli, Quantum Levels
Expert physics and chemistry quiz: fermions and quantum states, Schrödinger's equation, mass conservation, electron energy levels and photon energy.
Hard Physics & Chemistry Quiz: Higgs, Entropy and Periodic Table
A hard physics and chemistry quiz on quantum uncertainty, the Higgs particle found at CERN, entropy, the 1869 periodic table and the neutron. 10 questions.
MediumPhysics & Chemistry
Physics & Chemistry Quiz: Newton's Laws and Atoms (Intermediate)
Intermediate physics and chemistry quiz: the symbol Na, electrical energy units, the three laws of motion, a toxic combustion gas and the nucleus.
Physics & Chemistry Quiz: Speed of Light, Radioactivity, pH (Easy)
Easy physics and chemistry quiz on the speed of light, the Curies and radioactivity, atoms, heat-releasing reactions and the acidity scale. Free.
Very easyPhysics & Chemistry
Physics & Chemistry Quiz: Oxygen, Water and Gravity (Very Easy)
Very easy physics and chemistry quiz: the symbol for oxygen, water's boiling point, the apple and gravity, states of matter and Earth's pull. 10 questions.
Frequently asked questions about Science
What is the speed of light in a vacuum?
Light travels in a vacuum at exactly 299,792,458 meters per second, or roughly 300,000 kilometers per second. This value, written c, is a fundamental constant of physics: according to Einstein's special relativity, no information can travel faster.
What is the scientific method?
It is an approach that starts with observing a phenomenon, forms a hypothesis, tests it with controlled experiments, analyzes the results and draws a conclusion. Results must be reproducible by other researchers and can be challenged by new evidence.
Who discovered penicillin and how?
Scottish bacteriologist Alexander Fleming discovered penicillin in 1928, when a Penicillium mold that had accidentally landed on a culture dish stopped bacteria growing around it. Howard Florey and Ernst Chain later turned it into a usable drug in the 1940s.