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50 free 12th Grade trivia questions with answers — trivia quiz, new questions added Aug 2026.
Twelfth grade is the year the syllabus turns molecular: DNA copies itself in short backward bursts, a single swapped amino acid bends a red blood cell into a sickle, and a bacterium's toxin gene ends up inside a cotton plant. In physics the atom gets orbits and then loses them, in chemistry half-lives and rate constants take over from test-tube colours, and in maths probability finally meets calculus. These 50 questions follow a class 12 syllabus rather than a pub-quiz grab bag. Genetics, molecular biology and biotechnology carry the biggest share; then physical and organic chemistry, modern physics, vectors, matrices and distributions, the novels, plays and poems of senior English, twentieth-century world history, and a little civics and economics. Every answer comes with a one-sentence 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 50 questions with answers and explanations. Play the quiz
Q 01Which physician inoculated his gardener's eight-year-old son with cowpox from a milkmaid's blisters to prevent smallpox?
Edward Jenner
Edward Jenner took the cowpox from milkmaid Sarah Nelmes, who caught it from a cow called Blossom, whose hide now hangs in a London medical school library.
Q 02Which novel, begun by an 18-year-old during the 'Year Without a Summer' of 1816, is subtitled The Modern Prometheus?
Frankenstein
Frankenstein came out of Lord Byron's ghost-story contest at Villa Diodati, the same wet week that produced The Vampyre, a precursor of Dracula.
Q 03Whose skull does Hamlet hold in the graveyard, the court jester who once carried the young prince on his back?
Yorick
Yorick's skull has been a real one: pianist André Tchaikowsky left his to the Royal Shakespeare Company, and David Tennant held it as Hamlet in 2008.
Q 04Which 1948 US programme sent $13 billion to rebuild 17 European countries, an offer the Soviet Union refused?
Marshall Plan
The Marshall Plan was officially the European Recovery Program, and its $13.3 billion works out at about $137 billion in today's money.
Q 05Which particle, identified by Chadwick at Cambridge in 1932, opened the way to nuclear fission six years later?
Neutron
The neutron's discovery earned Chadwick the 1935 Nobel Prize, and he went on to head the British team on the Manhattan Project.
Q 06Which radiation, found when Johann Ritter saw it darken silver chloride faster than violet light, causes sunburn?
Ultraviolet
Ultraviolet shorter than about 300 nm never reaches the ground, absorbed by ozone and oxygen, which is why the ozone layer matters for skin cancer rates.
Q 07Which metal, melting at 3,422 °C, higher than any other element, is drawn into the filaments of incandescent bulbs?
Tungsten
Tungsten's symbol W comes from its German name Wolfram, after the ore wolframite; it also has the highest tensile strength of any pure metal.
Q 08Which Orwell novel gave English 'Big Brother', 'doublethink' and Room 101, where each prisoner meets his worst fear?
Nineteen Eighty-Four
Nineteen Eighty-Four was Orwell's ninth and final completed book, and it also gave English 'thoughtcrime' and 'Newspeak'; its '2 + 2 = 5' was lifted from a Soviet five-year-plan slogan.
Q 09Which ocean is widening about 2.5 centimetres a year along a central ridge that breaks the surface in Iceland?
Atlantic
The Atlantic's mid-ocean ridge is part of the longest mountain range in the world, and mapping it in the 1950s clinched the case for seafloor spreading.
Q 10In sickle-cell anaemia, which amino acid replaces glutamate at position 6 of haemoglobin's beta-globin chain?
Valine
Valine's swap makes haemoglobin S clump into fibres when oxygen runs low, yet carriers of one copy are partly protected against malaria, a link proven in 1954.
Q 11Which Danish physicist's 1913 atomic model, with electrons in fixed orbits, explained hydrogen's spectral lines?
Niels Bohr
Niels Bohr's model built on Rutherford's nucleus and killed off the plum-pudding atom, yet full quantum mechanics made it obsolete by the mid-1920s.
Q 12Which Austen novel, drafted as 'First Impressions', opens by declaring a rich single man 'must be in want of a wife'?
Pride and Prejudice
Pride and Prejudice was written when Austen was 20 or 21, yet it waited until 1813 to appear, her third novel written and her second to be published.
Q 13Which plastic, the first made from synthetic components, did Leo Baekeland patent in 1909 from phenol and formaldehyde?
Bakelite
Q 21Which E. coli gene cluster, decoded by Jacob and Monod, switches on to digest milk sugar only when glucose runs short?
lac operon
The lac operon won Jacob and Monod the 1965 Nobel Prize; they used it to work out how a cell decides which enzyme to make.
Q 22What term covers solution properties like freezing-point depression that depend only on the number of solute particles?
Colligative
Colligative comes from the Latin for 'bound together', a word Wilhelm Ostwald introduced in 1891, and it is why salt melts ice on roads whatever the salt.
Q 23For a first-order chemical reaction, the half-life stays the same regardless of which quantity?
Initial concentration
Bakelite's inventor was already rich from Velox photographic paper and was hunting for a substitute for shellac, the secretion of the lac insect.
Q 14Which rule, p² + 2pq + q², keeps allele frequencies constant in a population without selection, drift or migration?
Hardy–Weinberg equilibrium
Hardy–Weinberg equilibrium was called Hardy's law in English until 1943, when Curt Stern pointed out that the German physician Wilhelm Weinberg had got there first in 1908.
Q 15Which Mao campaign of backyard steel furnaces and forced communes caused a famine that killed up to 55 million Chinese?
Great Leap Forward
The Great Leap Forward's August 1958 decision to double steel output within a year pulled millions of peasants off the land, and the harvest collapsed.
Q 16Which boundary, roughly along 180° longitude, swings far east so that all of Kiribati shares a single calendar day?
International Date Line
The International Date Line's Kiribati kink puts the country's Line Islands on UTC+14, the most advanced clocks on Earth, and 31 December 1994 was skipped there entirely.
Q 17Which vector operation, whose result is perpendicular to both inputs, turns a lever arm and a force into torque?
Cross product
The cross product's magnitude equals the area of the parallelogram the two vectors span, and the right-hand rule decides which way it points.
Q 18Which nutrient, found by Henrik Dam while feeding chickens a cholesterol-depleted diet, is needed for blood to clot?
Vitamin K
Vitamin K got its letter because Dam's discovery was reported in a German journal, where it was christened Koagulationsvitamin.
Q 19Which 1958 experiment, growing E. coli on heavy nitrogen-15, showed that DNA replication is semiconservative?
Meselson–Stahl
Meselson–Stahl has been called 'the most beautiful experiment in biology', and it used the heavier but non-radioactive isotope so the DNA could be sorted by density in a centrifuge.
Q 20Whose 1928 mouse experiment with heat-killed smooth and live rough pneumococci revealed a 'transforming principle'?
Frederick Griffith
Frederick Griffith's 'transforming principle' turned out to be DNA itself, as Avery, MacLeod and McCarty and then Hershey and Chase went on to show.
Initial concentration drops out: a first-order half-life depends solely on the rate constant k, which is why carbon-14 dating works on any sample size.
Q 24Which French physicist's 1924 thesis proposed that electrons have wavelengths, confirmed by diffraction in 1927?
Louis de Broglie
Louis de Broglie won the 1929 Nobel Prize after Davisson and Germer saw electrons diffract off a nickel crystal in 1927, and he later inherited the family dukedom.
Q 25Which Presbyterian minister's probability theorem was read to the Royal Society in 1763, two years after his death?
Thomas Bayes
Thomas Bayes never published it; his friend Richard Price edited the manuscript and it was read aloud on 23 December 1763.
Q 26Which Shakespeare tragedy turns on a strawberry-spotted handkerchief that the ensign Iago plants in Cassio's lodgings?
Othello
Othello's plot was lifted from a 1565 Italian novella by Cinthio in which only Desdemona has a name; the rest are just 'the Moor' and 'the Ensign'.
Q 27Which British lawyer, never before east of Paris, got five weeks in 1947 to draw the India–Pakistan border?
Cyril Radcliffe
Cyril Radcliffe refused his 40,000-rupee fee after seeing the bloodshed his line set off, and his map split Punjab and Bengal almost in half.
Q 28Which metal, pricier than gold in the early 1800s, is now made by electrolysing its oxide dissolved in molten cryolite?
Aluminium
Aluminium was still dearer than silver when chosen to cap the Washington Monument in 1884; two years later two 22-year-olds, Hall and Héroult, found the process that made it cheap.
Q 29Which soil bacterium's cry1Ac gene, coding for a crystal toxin, is spliced into cotton to kill bollworm larvae?
Bacillus thuringiensis
Bacillus thuringiensis strains make over 200 different Bt toxins, and by 2014 more than seven million Indian farmers were growing the modified cotton.
Q 30Which enzyme, found by Temin and Baltimore in 1970, lets HIV copy its RNA genome into DNA inside a host cell?
Reverse transcriptase
Reverse transcriptase earned Temin and Baltimore a share of the 1975 Nobel Prize, and the same enzyme lets our own cells extend the telomeres on their chromosomes.