Clock Trivia
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98 free Clock trivia questions with answers — science & nature quiz, new questions added Oct 2026.
Clocks are one of the oldest technologies we still use every day, and their history is full of stories: a Chinese tower clock in 1088, a carpenter who solved longitude, a bell that cracked and kept ringing, and a nine-minute snooze that nobody has changed since 1956. This quiz has 52 free clock trivia questions with answers. It starts easy (what 'clock' originally meant, which region gave us the cuckoo clock, what Big Ben really is) and gets properly hard: the first spring-driven clock's royal owner, the German merchant who first described a cuckoo clock, the year the Doomsday Clock was furthest from midnight, and the county behind the song that named the grandfather clock. Escapements, quartz, caesium and clockwise-versus-counterclockwise all get a turn. Each answer was checked against Wikipedia's articles on clocks, Big Ben, John Harrison and the rest, and every question carries a citation, so it is safe to use for a pub quiz round or a classroom.
30 of 98 questions with answers and explanations. Play the quiz
Q 01The word 'clock' comes from the medieval Latin clocca, meaning what?
Bell
Early tower clocks had no dials at all; they simply rang the hours, so the name for the bell became the name for the machine.
Q 02Along with sundials, which device is possibly the oldest time-measuring instrument?
The water clock
The water clock: the Greeks called it the clepsydra, 'water thief'. Flowing water is hard to keep steady, so it was never very accurate, which pushed clockmakers towards machines.
Q 03Which invention made the first mechanical clocks possible in Europe around 1300?
The verge escapement
The verge escapement lets a falling weight's pull out one tick at a time; it ruled clockmaking for about 350 years, until the pendulum arrived in the 1650s.
Q 04Which English cathedral's iron clock, thought to date from 1386, is said to be the world's oldest still working?
Salisbury
Salisbury: its faceless clock, built only to strike the hours, was pushed aside for a new one in 1884, lay forgotten for over forty years and was restored to working order in 1956.
Q 05In which country was a towering astronomical clock built in the 11th century, long before Europe's mechanical clocks?
China
China: the polymath Su Song built the tower in Kaifeng, where it turned a celestial globe and sounded the hours. Carried off when the capital fell in the 1120s, it was never made to run again.
Q 06On a 12-hour clock, what do the letters AM stand for?
Ante meridiem
Ante meridiem, Latin for 'before noon'. Noon itself is neither before nor after noon, which is why the US time-standards agency calls '12 AM' and '12 PM' ambiguous and best avoided.
Q 07Clockmaking flourished in the 15th and 16th centuries in which two German metalworking towns?
Nuremberg and Augsburg
Nuremberg and Augsburg led the craft. Nuremberg's Peter Henlein is often credited with inventing the watch, yet spring-driven clocks were already being made before he was born.
Q 08Who is usually credited with inventing the pendulum clock in 1656?
Christiaan Huygens
Christiaan Huygens's pendulum cut a clock's daily error from about a quarter of an hour to under a minute.
Q 09French scientists considered defining which unit by a pendulum that swings once a second?
Metre
Metre: such a pendulum is about 99.4 cm long. France chose the Earth's meridian instead, and surveying it from Dunkirk to Barcelona took two astronomers over six years.
Q 10Salvador Dalí painted melting watches draped over a branch and a ledge in which 1931 work?
The Persistence of Memory
The Persistence of Memory's soft watches were inspired, Dalí said, by Camembert cheese melting in the sun, not by Einstein's theory of relativity.
Q 11The 1675 invention of the spiral balance spring, or hairspring, finally made what possible?
Accurate pocket watches
Accurate pocket watches arrived because the hairspring made the balance wheel swing at a steady rate, and watchmakers soon began adding a minute hand.
Q 12How much did the British government offer in 1714 for a way to determine longitude accurately?
£20,000
£20,000 was the top prize, for longitude within half a degree. John Harrison chased it for decades and won his last payment in 1773 only after appealing to King George III.
Q 13What was John Harrison's original trade before he turned to clockmaking?
Carpenter
Q 21Which everyday technology relies on atomic clocks in orbit that are set to tick slightly slow to offset relativity?
Satellite navigation
Satellite navigation depends on it: clocks on GPS satellites gain about 38 millionths of a second a day from relativity, enough to throw positions off by about 10 km a day if left uncorrected.
Q 22Strictly speaking, what does the name 'Big Ben' refer to?
The Great Bell
The Great Bell got the nickname first, perhaps after Sir Benjamin Hall, who oversaw its installation, or after the boxer Ben Caunt. Only later did 'Big Ben' spread to the clock and its tower.
Q 23In 2012, Big Ben's clock tower was officially renamed what?
Elizabeth Tower
Carpenter by trade and self-taught in clockmaking, Harrison built his early clocks almost entirely of wood, and even his first sea clock ran on wooden wheels.
Q 14How far out was Harrison's H4 watch when it reached Jamaica on its 1761–62 sea trial?
About 5 seconds
About 5 seconds slow, an error of roughly one nautical mile. The Board of Longitude still was not convinced and demanded a second trial, to Barbados.
Q 15Harrison's nearly frictionless, oil-free escapement is named after which creature?
Grasshopper
Grasshopper is also the shape of a modern tribute: on Cambridge's Corpus Clock a giant metal insect, the Chronophage or 'time eater', works as the escapement.
Q 16Whose 1995 bestseller Longitude brought Harrison's story to a wide audience?
Dava Sobel
Dava Sobel's book became a 2000 TV drama, with Michael Gambon as Harrison and Jeremy Irons as the retired naval officer who restored his sea clocks in the twentieth century.
Q 17What did clockmaker Alexander Bain pioneer in 1843, using pendulums to send images by wire?
Fax machine
The fax machine began with Bain's 1843 patent, in which a clock kept two pendulums in step to scan a message line by line. A practical version took other inventors until the 1860s.
Q 18The first quartz clock was built in 1927 at which company?
Bell Labs
Warren Marrison and J.W. Horton built it, exploiting the piezoelectric effect the Curies had found in 1880.
Q 19Which company produced the world's first quartz wristwatch, the Astron, in 1969?
Seiko
Seiko's Astron set off the quartz crisis: cheap, accurate quartz watches hit Swiss mechanical makers so hard that the plastic Swatch was launched in 1983 to win buyers back.
Q 20The first accurate atomic clock, built in 1955, kept time by the vibrations of which element's atoms?
Caesium
Caesium in these clocks is the stable form, not the radioactive one. Louis Essen's clock counted its atoms' microwave rhythm, which proved so steady that in 1967 it replaced astronomy as the basis of the second.
Elizabeth Tower marked Queen Elizabeth II's Diamond Jubilee and matched the palace's Victoria Tower, once the King's Tower, renamed for the only other monarch to reign sixty years.
Q 24Big Ben's tower rose after what destroyed the old Parliament in 1834?
Fire
Fire broke out in October 1834 when furnaces burning the Exchequer's old wooden tally sticks overheated. The clock tower of the new palace was finished in 1859.
Q 25Which observatory's red time ball has dropped at 1 pm daily since 1833 so ships' navigators could set their clocks?
Greenwich
Greenwich's ball let ships in the Thames check their chronometers at a glance. The idea spread to ports worldwide and lives on in New York's New Year's Eve ball drop in Times Square.
Q 26How is Big Ben's clock traditionally kept to time?
Pennies placed on the pendulum
Pennies placed on the pendulum raise its centre of mass, which makes it swing faster: each old penny added makes the clock gain about two-fifths of a second a day.
Q 27In the 1923 comedy Safety Last!, which silent-film star dangles from the hands of a skyscraper clock?
Harold Lloyd
Harold Lloyd hung from that clock with a right hand missing its thumb and forefinger, blown off in 1919 by a bomb he took for a prop and hidden on screen by a special glove.
Q 28Big Ben's quarter-hour chimes are known by what name?
The Westminster Quarters
The tune came from Cambridge and is said to be based on a phrase from Handel's Messiah.
Q 29Which region of Germany popularised the cuckoo clock and exported it worldwide?
The Black Forest
The Black Forest made the cuckoo clock famous but did not invent it: the first known description dates from 1629, before clockmaking had taken hold in the region.
Q 30Which actor, as Harry Lime in The Third Man, quips that centuries of Swiss peace produced only the cuckoo clock?
Orson Welles
Orson Welles wrote the speech into the script himself, by Graham Greene's account. He later recalled that the Swiss 'very nicely pointed out' they had never made any cuckoo clocks.