200 Science Trivia Questions & Answers to Test Your Brain

Science trivia is where a perfectly normal game night can suddenly turn into an argument about moons, body parts, atoms, or whether somebody really remembers high-school chemistry.

These 200 science trivia questions move through biology, Earth and space, chemistry, and physics, with ambiguous “only,” “largest,” and “smallest” claims tightened so each answer has a fair target.

Table of Contents

Biology Wonders

Start inside living things with anatomy, cells, genetics, plants, animals, and the systems that keep organisms alive.

Explore the mysteries of life with these thought-provoking biology trivia questions.

What is the powerhouse of the cell? Answer: Mitochondria
Which gas do plants primarily absorb from the atmosphere? Answer: Carbon dioxide
What is the process called where plants convert sunlight into energy? Answer: Photosynthesis
Which blood type is known as the universal donor? Answer: O-negative
What part of the brain controls balance? Answer: Cerebellum
How many chromosomes do humans have? Answer: 46
What is the largest organ in the human body? Answer: Skin
What is the basic unit of life? Answer: The cell
Which type of blood vessel carries blood away from the heart? Answer: Arteries
What molecule carries genetic information? Answer: DNA
Which organ is responsible for detoxifying chemicals and metabolizing drugs? Answer: Liver
What is the term for animals that feed on plants? Answer: Herbivores
What pigment gives plants their green color? Answer: Chlorophyll
How many hearts does an octopus have? Answer: Three
Which is the smallest bone in the human body? Answer: Stapes
What do we call the study of fungi? Answer: Mycology
What is the main function of red blood cells? Answer: To carry oxygen
Which part of a plant anchors it in the soil? Answer: Roots
How many pairs of ribs are in the human body? Answer: 12
What is the name of the process by which cells divide? Answer: Mitosis
Which organelle is responsible for protein synthesis? Answer: Ribosome
What type of muscle is found in the heart? Answer: Cardiac muscle
What type of organism thrives in extreme environments? Answer: Extremophiles
Which part of the human eye controls how much light enters? Answer: Iris
What term describes the variety of life on Earth? Answer: Biodiversity
Which bird is known for its ability to mimic sounds? Answer: Lyrebird
What structure in plants is responsible for transporting water? Answer: Xylem
Which vitamin is produced when skin is exposed to sunlight? Answer: Vitamin D
What is the study of animals called? Answer: Zoology
Which part of the brain is involved in memory? Answer: Hippocampus
What is the largest living land animal? Answer: The African bush elephant
How many bones are in an adult human body? Answer: 206
Which gland produces insulin? Answer: Pancreas
Which element makes up the largest share of the human body by mass? Answer: Oxygen
What type of blood cells help in clotting? Answer: Platelets
What is the term for the change of a caterpillar into a butterfly? Answer: Metamorphosis
What type of joint is the shoulder? Answer: Ball and socket joint

Earth and Space Exploration

Next, zoom all the way out to planets, moons, oceans, geology, weather, and the wider universe.

Delve into the marvels of our planet and the cosmos with these trivia questions.

What is the largest planet in our solar system? Answer: Jupiter
Which planet is known as the "Red Planet"? Answer: Mars
How long does Earth take to orbit the Sun? Answer: 365.25 days
What is the name of Earth's largest ocean? Answer: Pacific Ocean
What is the hottest planet in our solar system? Answer: Venus
Which planet has the most confirmed moons as of August 2026? Answer: Saturn, with 293
What is the Earth's core primarily made of? Answer: Iron and nickel
What is the name of the galaxy we live in? Answer: Milky Way
Which layer of the Earth is liquid? Answer: Outer core
What is the tallest mountain on Earth? Answer: Mount Everest
Which gas is most abundant in Earth's atmosphere? Answer: Nitrogen
What was the first artificial satellite placed into Earth orbit? Answer: Sputnik 1
How old is the Earth estimated to be? Answer: About 4.5 billion years
What phenomenon causes the Northern Lights? Answer: Solar wind interacting with Earth's atmosphere
Which country was the first to land humans on the Moon? Answer: The United States
What is the term for a meteoroid that hits Earth’s surface? Answer: Meteorite
What is the smallest planet in the solar system? Answer: Mercury
What is the primary cause of ocean tides? Answer: Moon's gravitational pull
What is the second largest planet in our solar system? Answer: Saturn
How many planets are in our solar system? Answer: Eight
What is the study of stars called? Answer: Astronomy
Which planet is known for its rings? Answer: Saturn
What is a supernova? Answer: A powerful stellar explosion that can occur at the end of a star’s life
What is the largest desert on Earth? Answer: Antarctic Desert
What is the speed of light? Answer: 299,792 kilometers per second
What percentage of Earth is covered in water? Answer: About 71%
What do we call the study of Earth's physical structure? Answer: Geology
Which planet has a day longer than its year? Answer: Venus
What is the brightest star in the night sky? Answer: Sirius
Which two elements make up water? Answer: Hydrogen and oxygen
What is the closest star to Earth? Answer: The Sun
What is the main gas found in the Sun? Answer: Hydrogen
What is the Earth's natural satellite? Answer: The Moon
What is the term for molten rock below Earth's surface? Answer: Magma
What is the deepest point in Earth's oceans? Answer: Mariana Trench
Which layer of Earth's atmosphere contains the ozone layer? Answer: Stratosphere
What do we call a group of stars forming a pattern? Answer: Constellation

Chemistry Conundrums

Time for elements, compounds, reactions, acids, gases, and the periodic table.

Get ready to mix things up with fascinating chemistry trivia questions!

What is the chemical symbol for gold? Answer: Au
What is the most abundant element in the universe? Answer: Hydrogen
What element is known as the "king of chemicals"? Answer: Sulfur
What is the chemical formula for water? Answer: H₂O
What gas do humans exhale during respiration? Answer: Carbon dioxide
Which acid is found in the stomach? Answer: Hydrochloric acid
What element is used in pencils? Answer: Carbon (graphite)
What is the hardest natural substance on Earth? Answer: Diamond
What is the pH level of pure water? Answer: 7
What is the process called when a solid turns directly into a gas? Answer: Sublimation
What does NaCl stand for? Answer: Sodium chloride (table salt)
Which element is known as a noble gas? Answer: Helium
What is the study of matter and its interactions called? Answer: Chemistry
What is the chemical symbol for silver? Answer: Ag
What element is commonly used in thermometers? Answer: Mercury
Which element has the atomic number 1? Answer: Hydrogen
What is the lightest element on the periodic table? Answer: Hydrogen
What element is used in the production of nuclear energy? Answer: Uranium
What is the process by which plants absorb nitrogen called? Answer: Nitrogen fixation
Which gas is known as "laughing gas"? Answer: Nitrous oxide
What element is a major component of bones? Answer: Calcium
What is the common name for acetic acid? Answer: Vinegar
What type of bond involves sharing of electrons? Answer: Covalent bond
What does the term "organic chemistry" refer to? Answer: The study of carbon-containing compounds
What is the molar mass of water? Answer: 18 g/mol
What is the chemical symbol for potassium? Answer: K
Which element is liquid at room temperature? Answer: Mercury
What is the primary component of natural gas? Answer: Methane
Which element is generally considered the most reactive nonmetal? Answer: Fluorine
What is the term for a substance that speeds up a chemical reaction? Answer: Catalyst
What is the chemical symbol for lead? Answer: Pb
What does pH stand for? Answer: Potential of hydrogen
What element is commonly used in batteries? Answer: Lithium
What is the main ingredient in soap that cleans? Answer: Sodium or potassium salts of fatty acids
Which element is known for its yellow-green gas and strong odor? Answer: Chlorine
What does CO₂ stand for? Answer: Carbon dioxide
What type of reaction releases heat? Answer: Exothermic
What is the study of the rates of chemical reactions called? Answer: Chemical kinetics
What is the atomic number of oxygen? Answer: 8

Physics Phenomena

Finish the core rounds with forces, energy, waves, electricity, motion, and the rules that describe how matter behaves.

Uncover the forces and principles that govern our universe with these physics trivia questions!

What is the SI unit of energy? Answer: Joule
What is the speed of sound in air? Answer: Approximately 343 m/s
What is the term for the bending of light? Answer: Refraction
Who formulated the laws of motion? Answer: Isaac Newton
What does E=mc² stand for? Answer: Energy equals mass times the speed of light squared
What is the unit of electric current? Answer: Ampere
What is the phenomenon where light behaves as both a wave and a particle? Answer: Wave-particle duality
What type of lens is used to correct nearsightedness? Answer: Concave lens
What is the SI unit of power? Answer: Watt
What is the term for materials that resist the flow of electric current? Answer: Insulators
What is the acceleration due to gravity on Earth? Answer: 9.8 m/s²
What is the measure of the amount of matter in an object? Answer: Mass
What type of wave is sound? Answer: Longitudinal wave
What does a voltmeter measure? Answer: Voltage
What is the SI unit of resistance? Answer: Ohm
What does the first law of thermodynamics say about energy in an isolated system? Answer: Energy is conserved; it can change form but is not created or destroyed
What is the device used to measure atmospheric pressure? Answer: Barometer
What type of mirror is used in car side mirrors? Answer: Convex mirror
What is the principle behind a rocket's motion? Answer: Newton's third law (action and reaction)
What is the term for the force that opposes motion between two surfaces? Answer: Friction
Who is known as the father of electromagnetism? Answer: Michael Faraday
What is the term for a closed loop in which electricity flows? Answer: Circuit
What happens to a gas when it is compressed? Answer: Its pressure increases
What is the term for the distance between two wave peaks? Answer: Wavelength
What is the process of splitting a nucleus called? Answer: Nuclear fission
What is the unit of frequency? Answer: Hertz
What is the force that pulls objects toward the center of the Earth? Answer: Gravity
What is the principle of buoyancy called? Answer: Archimedes' principle
What does a prism do to light? Answer: It disperses light into its spectrum
What is the phenomenon where light bounces off a surface? Answer: Reflection
What is the term for an object's resistance to change in motion? Answer: Inertia
What is the unit of magnetic flux? Answer: Weber
What is the study of heat and temperature called? Answer: Thermodynamics
What is the term for the force per unit area? Answer: Pressure
What is the smallest discrete unit of a molecular compound that retains that compound’s chemical identity? Answer: A molecule
What is the force that acts against an object's motion through the air? Answer: Air resistance
What is the name of the quantum particle that carries the electromagnetic force? Answer: Photon
What is the study of subatomic particles called? Answer: Particle physics

More Science Trivia

The final round mixes all four subjects for a little extra chaos.

Enjoy these extra science trivia questions spanning all categories for even more fun!

What is the smallest particle of an element? Answer: Atom
Which metal is liquid at typical room temperature? Answer: Mercury
Which planet is commonly called the Morning Star when it is visible before sunrise? Answer: Venus
What is the most abundant metal in the Earth's crust? Answer: Aluminum
What does DNA stand for? Answer: Deoxyribonucleic acid
What gas is commonly used in balloons to make them float? Answer: Helium
What is the hottest part of the Earth? Answer: Inner core
Who developed the theory of evolution by natural selection? Answer: Charles Darwin
What type of rock is formed by volcanic activity? Answer: Igneous rock
What is the SI unit of temperature? Answer: Kelvin
What do you call the study of the weather? Answer: Meteorology
What is the process where water changes from a liquid to a gas? Answer: Evaporation
What is the hardest naturally occurring mineral? Answer: Diamond
What is the name of the organ that produces bile? Answer: Liver
Which metal has the highest melting point? Answer: Tungsten
What is the study of the interaction between living things and their environment called? Answer: Ecology
What is the main gas responsible for the greenhouse effect? Answer: Carbon dioxide
What is the basic building block of proteins? Answer: Amino acids
What planet has the Great Red Spot? Answer: Jupiter
What part of the human body contains the smallest bones? Answer: Ear
What is the SI unit of electric charge? Answer: Coulomb
What is the term for animals that eat both plants and meat? Answer: Omnivores
What do you call the force that opposes the motion of objects in contact? Answer: Friction
What is the main organ of the respiratory system? Answer: Lungs
What is the most common isotope of hydrogen? Answer: Protium
What is the term for the study of insects? Answer: Entomology
Which planet has an axial tilt of about 98 degrees, making it appear to rotate on its side? Answer: Uranus
What is the unit used to measure sound intensity? Answer: Decibel
What is the name of the outer layer of the Earth? Answer: Crust
What is the chemical symbol for iron? Answer: Fe
What spectral type of main-sequence star is the Sun? Answer: G2 V, commonly called a yellow dwarf
What is the term for a celestial body that orbits a planet? Answer: Moon
Which organelle usually occupies most of the volume of a mature plant cell? Answer: The central vacuole
What is the name of the process that powers the Sun? Answer: Nuclear fusion
What is the largest gland in the human body? Answer: The liver
What is the study of the behavior and properties of light? Answer: Optics
What is the most abundant element in the Earth’s crust? Answer: Oxygen
What is the closest planet to the Sun? Answer: Mercury
What is the study of fossils called? Answer: Paleontology
What type of galaxy is the Milky Way? Answer: Spiral galaxy
What is the term for the path of an object in orbit? Answer: Trajectory
Which mineral group makes up roughly 60% of Earth’s crust? Answer: Feldspars
What type of energy is stored in a stretched rubber band? Answer: Potential energy
What is the chemical symbol for chlorine? Answer: Cl
What type of cloud is associated with thunderstorms? Answer: Cumulonimbus
What is the term for the splitting of white light into its spectrum? Answer: Dispersion
What is the SI unit for luminous intensity? Answer: Candela
What is the most common element in the universe? Answer: Hydrogen
What is the term for water droplets frozen into ice crystals in the atmosphere? Answer: Snow

How the Science Facts Were Checked

Science facts can change as measurements improve, especially in astronomy. For this September 2026 review, I checked current planetary information against NASA; Saturn now has 293 confirmed moons. NASA’s Sun facts also identifies our star as a G2 V main-sequence star.

For Earth-science questions, I used the U.S. Geological Survey, which estimates feldspars make up about 60% of Earth’s crust.

Keep Testing Your Brain

Try the biology trivia, chemistry trivia, or jump into the 700-question trivia challenge.

Ellie

Ellie Ewert is the founder and author of RandomTrivia.co, blending her passion for research with years of experience in content creation to deliver accurate, engaging, and well-sourced trivia. Dedicated to providing readers with trustworthy and entertaining facts, she applies meticulous fact-checking and SEO expertise to ensure every article meets the highest standards. Read more about our high standards in our Editorial Guidelines.