10th Grade Trivia
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47 free 10th Grade trivia questions with answers — trivia quiz, new questions added Sep 2026.
Tenth grade is the year school gets specific: the periodic table stops being a poster and starts being Mendeleev's gaps, Newton's laws explain why you lurch forward on a bus, and the quadratic formula, Mendel's pea plants and Magna Carta all arrive within a few months of each other. It is also the year most of us last knew any of it cold. These 47 questions follow a class 10 syllabus rather than a pub-quiz grab bag: biology, chemistry and physics make up the largest share, then maths (Pythagorean triples, the discriminant, perfect numbers), world and US history from Magna Carta to the Salt March, geography, civics, and the books a sophomore reads — The Great Gatsby, To Kill a Mockingbird, Lord of the Flies, Romeo and Juliet and Animal Farm. Every answer comes with a one-line explanation that adds something the textbook left out. Play it to see whether you would still pass, hand it to a student as a revision round, or print it for a classroom quiz.
30 of 47 questions with answers and explanations. Play the quiz
Q 01Which country spans eleven time zones and borders fourteen others?
Russia
Russia would be even larger had it not sold Alaska to the United States in 1867, fearing Britain could seize the hard-to-defend colony.
Q 02Which organ, the heaviest inside the human body, produces bile and stores glycogen?
Liver
The liver regrows lost tissue so well that a living donor can give part of theirs, and both pieces grow back to near full size.
Q 03Which organelle, the site of aerobic respiration, has its own DNA, almost always inherited from the mother?
Mitochondrion
The mitochondrion has a genome like a bacterium's, supporting the theory that it began as a free-living microbe engulfed by an early cell.
Q 04Which 1803 deal with Napoleon's France nearly doubled the size of the United States for $15 million?
Louisiana Purchase
The Louisiana Purchase worked out at less than three cents an acre, and Napoleon sold because war with Britain was imminent.
Q 05Which planet hosts the Great Red Spot, a giant storm tracked since the 1800s?
Jupiter
Jupiter's Great Red Spot is wider than Earth, yet it has been shrinking for about a century, and no one knows exactly what makes it red.
Q 06Which explorer's fleet first circled the globe, though its commander was killed in the Philippines?
Magellan
Magellan set out from Spain with five ships, but only the Victoria, under Elcano, made it home, almost exactly three years later.
Q 07Which amendment to the US Constitution, ratified in December 1865, abolished slavery nationwide?
Thirteenth
The Thirteenth Amendment allows involuntary servitude 'as a punishment for crime', the loophole behind convict leasing and prison labor.
Q 08Which mathematician, as a boy, reputedly summed 1 to 100 in seconds by pairing numbers into 101s?
Carl Friedrich Gauss
Carl Friedrich Gauss's gift won him a patron: the Duke of Brunswick gave him a stipend that put him through the Collegium Carolinum.
Q 09Australia is famously dry, but which continent is the driest of all?
Antarctica
Antarctica is a polar desert with little precipitation, yet its ice holds about 70% of the world's fresh water.
Q 10Which novella satirizing Stalin's Soviet Union ends with pigs walking upright and carrying whips?
Animal Farm
Animal Farm's final commandment reads 'All animals are equal, but some animals are more equal than others', and the pigs end up indistinguishable from the men.
Q 11Which element, first identified as a distinct gas by Henry Cavendish, makes up 75% of normal matter?
Hydrogen
Hydrogen was Cavendish's 'inflammable air'; Lavoisier later named it from the Greek for 'water-former' after showing it burns to make water.
Q 12Which photosynthetic pigment absorbs red and blue light but reflects the wavelengths in between?
Chlorophyll
Chlorophyll is why autumn leaves turn yellow: as it breaks down, the carotenoids that were there all summer finally show through.
Q 13Which property, the subject of Newton's first law, throws bus riders forward when the driver brakes?
Inertia
Inertia was spotted by Galileo, who argued a ball rolling on a level surface would keep going unless disturbed, long before Newton's first law.
Q 21Which eye defect, where distant objects focus in front of the retina, does a diverging lens correct?
Myopia
Myopia in children has climbed since 1990, and studies link more time spent outdoors in daylight to lower rates.
Q 22Which leaf pores, usually more numerous on the underside, open and close to control gas exchange?
Stomata
Stomata are flanked by two guard cells that bow apart as they swell with water, opening the pore, and relax to close it again.
Q 23Which gas, given off by yeast as bread dough rises, turns clear limewater milky?
Carbon dioxide
Carbon dioxide reacts with the calcium hydroxide in limewater to precipitate insoluble calcium carbonate, the same compound as chalk.
Q 14Which law, set out by a German physicist in 1827, makes current in a wire proportional to voltage?
Ohm's law
Ohm's law was first dismissed by critics as empty mathematical fancy, before becoming a cornerstone of electrical theory.
Q 15Which of these common liquids is the most alkaline?
Bleach
Bleach sits at pH 11 or higher, and mixing it with vinegar or other acids releases a toxic gas.
Q 16What is the approximate speed of light in a vacuum, the constant c in Einstein's equation E = mc²?
300,000 km/s
Light covers about 300,000 km/s, so the sunlight reaching Earth left the Sun a little over eight minutes earlier.
Q 17Which trait type vanished in Mendel's hybrid peas, then returned in a quarter of the next generation?
Recessive
Recessive traits hide behind a dominant allele, so crossing two hybrids brings them back in one offspring in four, Mendel's famous 3:1 ratio.
Q 18Which brain structure coordinates fine movement and balance?
Cerebellum
The cerebellum fine-tunes movement rather than starting it, so damage leaves people unsteady and clumsy.
Q 19Which alkali metal, atomic number 11, is stored under oil and is soft enough to cut with a knife?
Sodium
Sodium was first isolated in 1807 by Humphry Davy, who passed electricity through caustic soda, and the element is named after soda.
Q 20Which optical effect, far stronger at short wavelengths, makes the daytime sky blue and sunsets red?
Rayleigh scattering
Rayleigh scattering favours violet even more than blue, but sunlight carries less violet and our eyes respond more to blue, so the sky looks blue.
Q 24Which scientist predicted gallium and germanium years before either element was discovered?
Dmitri Mendeleev
Dmitri Mendeleev reasoned that gaps in his periodic table, such as the one below aluminium, held undiscovered elements whose properties he could forecast.
Q 25Which of DNA's four bases is missing from RNA, where uracil takes its place?
Thymine
Thymine sits in DNA because damaged cytosine turns into uracil, so a cell that finds uracil in its DNA knows to repair it.
Q 26Which number sequence shows up in the spirals of pinecones?
Fibonacci sequence
The Fibonacci sequence is named for the mathematician whose 1202 book Liber Abaci used it to model how fast rabbits breed.
Q 27What value of the discriminant b² − 4ac gives a quadratic equation exactly one repeated real root?
Zero
Zero: the ± √(b² − 4ac) in the quadratic formula then adds and subtracts nothing, so both roots equal −b/2a.
Q 28Which regular polygon with more than four sides can tile a flat surface with no gaps?
Hexagon
The hexagon fits three to a corner, and since equal hexagonal cells need the least total wall, a honeycomb uses the least wax.
Q 29Which Greek mathematician proved that there are infinitely many prime numbers?
Euclid
Euclid's proof in his Elements multiplies any finite list of primes and adds one; the result has a prime factor missing from the list.
Q 30A 30-60-90 right triangle is exactly half of which shape?
An equilateral triangle
An equilateral triangle split by its height gives two 30-60-90 triangles, so the short side is half the hypotenuse and sin 30° equals exactly 1/2.