Biology & life sciences
Biology questions hit hardest when they upend something everyone assumes is true.
Q1.What molecule carries the genetic instructions in nearly all living organisms?Tap to reveal
Answer: DNA
Its double-helix shape was worked out by Watson and Crick in 1953 using X-ray images taken by Rosalind Franklin.
Q2.Which organ in the human body produces the hormone insulin?Tap to reveal
Answer: Pancreas
Insulin comes from beta cells in the islets of Langerhans, named after the German medical student who described them in 1869.
Q3.What is the process by which plants use sunlight to make sugar from carbon dioxide and water?Tap to reveal
Answer: Photosynthesis
The oxygen released as a by-product comes from splitting water molecules, not from the carbon dioxide.
Q4.What is the largest organ of the human body?Tap to reveal
Answer: Skin
An adult's skin weighs several kilograms and replaces its outer layer roughly every month.
Q5.What is the name of the pigment that gives plant leaves their green colour?Tap to reveal
Answer: Chlorophyll
It absorbs red and blue light strongly and reflects green, which is why leaves look green to our eyes.
Q6.How many pairs of chromosomes does a typical human body cell contain?Tap to reveal
Answer: 23
One chromosome of each pair comes from each parent, and the 23rd pair determines biological sex.
Q7.Which Austrian monk's experiments with pea plants laid the foundation of modern genetics?Tap to reveal
Answer: Gregor Mendel
His 1866 paper went almost unnoticed until three botanists independently rediscovered his laws around 1900.
Q8.In biological classification, what is the taxonomic rank between family and species?Tap to reveal
Answer: Genus
In the name Homo sapiens, Homo is the genus and sapiens is the species epithet, which is why the first word is capitalised.
Q9.Which naturalist independently arrived at the theory of evolution by natural selection, prompting a joint presentation with Charles Darwin in 1858?Tap to reveal
Answer: Alfred Russel Wallace
Wallace's letter from the Malay Archipelago pushed Darwin to finally publish On the Origin of Species the following year.
Q10.What is the name of the process by which certain bacteria convert nitrogen gas from the air into ammonia that plants can use?Tap to reveal
Answer: Nitrogen fixation
Legumes host these bacteria in root nodules, which is why farmers rotate crops with peas and beans to enrich the soil.
Chemistry & elements
Chemistry trivia rewards people who remember the periodic table — or who notice the surprising properties of everyday materials.
Q1.What is the chemical symbol for gold?Tap to reveal
Answer: Au
The symbol comes from the Latin word aurum, which is also the root of the Spanish oro and the French or.
Q2.Which element has the atomic number 1?Tap to reveal
Answer: Hydrogen
It makes up roughly three-quarters of the ordinary matter in the universe by mass.
Q3.What is the chemical formula for ordinary table salt?Tap to reveal
Answer: NaCl
Sodium is a metal that reacts violently with water and chlorine is a toxic gas, yet bonded together they form an essential nutrient.
Q4.On the pH scale, what number represents a neutral solution at room temperature?Tap to reveal
Answer: 7
Each step on the scale is a tenfold change in hydrogen-ion concentration, so pH 4 is a thousand times more acidic than pH 7.
Q5.Which element is the most abundant in the Earth's crust by mass?Tap to reveal
Answer: Oxygen
About 46 percent of the crust's mass is oxygen, nearly all of it locked inside silicate minerals rather than floating free as a gas.
Q6.What name is given to the group of highly unreactive elements in the far-right column of the periodic table?Tap to reveal
Answer: Noble gases
Helium, neon, argon, krypton, xenon and radon all have full outer electron shells, which is why they rarely form compounds.
Q7.Which Russian chemist published the first widely recognised periodic table in 1869?Tap to reveal
Answer: Dmitri Mendeleev
He left gaps for elements not yet discovered and correctly predicted the properties of gallium and germanium before anyone found them.
Q8.Which is the only metal that is liquid at standard room temperature?Tap to reveal
Answer: Mercury
Bromine is the only non-metal element that is also liquid at room temperature, and gallium melts in the palm of your hand at about 30 degrees Celsius.
Q9.Which radioactive element did Marie Curie name after her homeland?Tap to reveal
Answer: Polonium
She and Pierre Curie announced polonium in July 1898 and radium five months later, both extracted from tonnes of pitchblende ore.
Q10.What is the term for two or more compounds that share the same molecular formula but have different structures?Tap to reveal
Answer: Isomers
Ethanol, the alcohol in drinks, and dimethyl ether, a gas, are both C2H6O yet behave completely differently.
Physics & math basics
Physics questions test whether you remember the rules of how things move, fall, and interact. These ones don't require formulas.
Q1.What force pulls objects toward the centre of the Earth?Tap to reveal
Answer: Gravity
On the Moon's surface it is only about one-sixth as strong, which is why the Apollo astronauts bounced as they walked.
Q2.What is the value of pi rounded to two decimal places?Tap to reveal
Answer: 3.14
Pi is irrational, so its decimal expansion never ends or repeats, and computers have now calculated trillions of its digits.
Q3.What is the speed of light in a vacuum, rounded to the nearest thousand kilometres per second?Tap to reveal
Answer: 300,000 km/s
The exact figure, 299,792.458 km/s, is fixed by definition because the metre itself is now defined in terms of it.
Q4.Which scientist published the three laws of motion in 1687?Tap to reveal
Answer: Isaac Newton
The same book, the Principia, also set out his law of universal gravitation, explaining planetary orbits and falling apples with one rule.
Q5.What is the SI unit of energy?Tap to reveal
Answer: Joule
One joule is roughly the energy needed to lift a small apple one metre against gravity.
Q6.Which branch of mathematics, dealing with rates of change, was developed independently by Newton and Leibniz?Tap to reveal
Answer: Calculus
Their followers fought a bitter priority dispute for decades, yet it is Leibniz's notation that is still taught today.
Q7.What is the only even prime number?Tap to reveal
Answer: 2
Every other even number is divisible by 2, which automatically rules it out from being prime.
Q8.What term describes the number of wave cycles that pass a point each second, measured in hertz?Tap to reveal
Answer: Frequency
Human hearing spans roughly 20 to 20,000 hertz, and the upper limit drops steadily with age.
Q9.What is the sum of the interior angles of a hexagon, in degrees?Tap to reveal
Answer: 720
The formula (n minus 2) times 180 works for any polygon, because a hexagon can be cut into four triangles.
Q10.What is the name of the particle that carries the electromagnetic force, including visible light?Tap to reveal
Answer: Photon
Einstein's 1905 explanation of the photoelectric effect using light quanta is what earned him his Nobel Prize, not relativity.
Astronomy & space
Astronomy trivia is the most awe-inspiring category — the answers usually involve numbers so big they reset your sense of scale.
Q1.Which planet is known as the Red Planet?Tap to reveal
Answer: Mars
Its colour comes from iron oxide, essentially rust, coating the dust on its surface.
Q2.What is the name of the galaxy that contains our solar system?Tap to reveal
Answer: Milky Way
It is a barred spiral roughly 100,000 light-years across, and the Sun takes about 230 million years to complete one orbit of its centre.
Q3.Who became the first human to travel into space in 1961?Tap to reveal
Answer: Yuri Gagarin
His Vostok 1 flight lasted 108 minutes and completed a single orbit of the Earth.
Q4.Which is the largest planet in the solar system?Tap to reveal
Answer: Jupiter
It is more than twice as massive as all the other planets combined.
Q5.What is the name of the closest star to Earth after the Sun?Tap to reveal
Answer: Proxima Centauri
It lies about 4.24 light-years away, so even its light takes more than four years to reach us.
Q6.What is the name of the boundary around a black hole beyond which nothing, not even light, can escape?Tap to reveal
Answer: Event horizon
The first image of a black hole's shadow, released in 2019, showed the supermassive black hole at the centre of the galaxy M87.
Q7.Which space telescope, launched in 1990, was named after the astronomer who showed that the universe is expanding?Tap to reveal
Answer: Hubble
Its first images were blurry because of a flawed mirror, which astronauts corrected during a 1993 servicing mission.
Q8.What is the name of the ring of icy bodies beyond Neptune that includes Pluto?Tap to reveal
Answer: Kuiper Belt
Pluto was reclassified as a dwarf planet in 2006 partly because it shares its neighbourhood with so many similar objects.
Q9.Which planet rotates almost on its side, with an axial tilt of about 98 degrees?Tap to reveal
Answer: Uranus
Each pole gets roughly 42 years of continuous sunlight followed by 42 years of darkness during the planet's 84-year orbit.
Q10.What is the term for the stretching of light from a receding galaxy toward longer wavelengths?Tap to reveal
Answer: Redshift
Edwin Hubble's 1929 measurements showed that more distant galaxies have larger redshifts, the key evidence for an expanding universe.
Earth science & geology
Earth science trivia explains the planet under your feet — questions where the answer reveals something about the place you live.
Q1.What is the name of the Earth's thin outermost solid layer?Tap to reveal
Answer: Crust
Oceanic crust averages only around 7 km thick, while continental crust can reach about 70 km beneath the Himalayas.
Q2.What is molten rock called once it erupts onto the Earth's surface?Tap to reveal
Answer: Lava
While it is still underground the same molten rock is called magma.
Q3.What type of rock forms when magma or lava cools and solidifies?Tap to reveal
Answer: Igneous
Granite and basalt are both igneous, but granite cools slowly underground with large crystals while basalt cools quickly at the surface.
Q4.What is the name of the supercontinent that began breaking apart roughly 200 million years ago?Tap to reveal
Answer: Pangaea
Alfred Wegener proposed continental drift in 1912, partly because the coastlines of South America and Africa fit together like puzzle pieces.
Q5.On the Mohs scale of mineral hardness, which mineral scores the maximum of 10?Tap to reveal
Answer: Diamond
Talc sits at 1, and because the scale only ranks scratch resistance, the gaps between its steps are far from equal.
Q6.In which layer of the atmosphere does nearly all of the Earth's weather occur?Tap to reveal
Answer: Troposphere
It extends roughly 8 to 15 km above the surface, thinner over the poles and thicker over the equator.
Q7.What name is given to the horseshoe-shaped zone around the Pacific Ocean where most of the world's earthquakes and volcanoes occur?Tap to reveal
Answer: Ring of Fire
About three-quarters of the world's active volcanoes sit along it, driven by tectonic plates sliding beneath one another.
Q8.Which atmospheric layer contains the ozone layer that absorbs most of the Sun's harmful ultraviolet light?Tap to reveal
Answer: Stratosphere
The 1987 Montreal Protocol phased out CFCs, and the Antarctic ozone hole has been slowly recovering ever since.
Q9.What is the short name for the boundary between the Earth's crust and mantle, named after a Croatian seismologist?Tap to reveal
Answer: Moho
Andrija Mohorovicic spotted it in 1909 when he noticed seismic waves from an earthquake speeding up abruptly at a certain depth.
Q10.In which geological era are we living today?Tap to reveal
Answer: Cenozoic
It began 66 million years ago, right after the asteroid impact that ended the age of the dinosaurs.
Why science trivia hits different
Most trivia categories test recall. Science trivia tests understanding — when you know the answer to "how many hearts does an octopus have", the FACT is interesting, but the EXPLANATION is what sticks. Daily exposure to science trivia is how curious people stay curious.
The Trivio.NET app delivers a fresh daily quiz with science questions mixed in. 10 questions, 100 seconds, free to play.
Frequently Asked Questions
Are these science trivia questions for adults or kids?
Mixed. The biology and astronomy questions work for ages 8+. Chemistry and physics are slightly older. Mark difficulty for your specific audience.
How can I make science trivia more visual?
Use images alongside questions — periodic table reference, solar system diagrams, anatomy charts. Multi-modal trivia engages more than text-only.
Where can I find more science trivia question packs?
Trivio.NET's Science category has 64+ quiz packs covering biology, chemistry, physics, astronomy and earth science.
What's the most surprising science trivia answer?
Most people are shocked that octopuses have 3 hearts, water transmits sound faster than air, and there are more bacteria on a phone than a toilet seat.
