Sound
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50 free Sound trivia questions with answers — science & nature quiz, new questions added Oct 2026.
Sound is nothing more than a vibration passed from one particle to the next, yet it carries speech, music and every warning you have ever jumped at. It travels at different speeds through different materials, bounces off walls and bends its way to your ears, which turn the faintest flutter of air into something you recognise in an instant. This quiz covers what a school unit on sound waves covers, then goes further: how waves are measured, why notes are high or low, loud or soft, how the ear and the voice work, and how animals, doctors and submarines put sound to use. Several questions are guess-the-sound puzzles in words: a familiar crack, pop or rumble is described, and you name what really makes it. A few visit the film studio, where famous sound effects are made. It suits middle school and high school students revising waves, teachers who want a ready-made review round, and adults who enjoy knowing why things sound the way they do. Every answer comes with a short explanation.
30 of 50 questions with answers and explanations. Play the quiz
Q 01Which nursery rhyme did Thomas Edison recite in 1877 to test his newly built phonograph?
Mary Had a Little Lamb
Mary Had a Little Lamb was scratched into a sheet of tinfoil wrapped round a cylinder, then played back. That first recording was never preserved.
Q 02The sharp crack of a bullwhip is produced when its tip travels fast enough to create what?
A sonic boom
A sonic boom in miniature: a loop racing down the whip speeds up until the tip passes the speed of sound, more than 30 times faster than the handle moved.
Q 03A space explosion would be silent to a nearby astronaut because sound cannot travel through what?
A vacuum
A vacuum has no particles to pass the vibrations along. Robert Boyle is credited with discovering the part air plays in carrying sound.
Q 04Which volcano's 1883 eruption made the loudest sound in recorded history, heard 4,800 kilometres away?
Krakatoa
Krakatoa's blast was heard on Rodrigues, an island near Mauritius, where people took it for cannon fire from a ship.
Q 05The pop heard when people crack their knuckles comes from which of these inside the finger?
Bubbles in joint fluid
Bubbles in joint fluid form as the knuckle is pulled apart and dissolved gas comes out of solution. It takes about 20 minutes before the same knuckle can crack again.
Q 06The smallest bone in the human body sits in the middle ear and is named after which riding item?
Stirrup
Stirrup is what its Latin name, stapes, means. It is the last of three tiny bones that carry vibrations across the middle ear.
Q 07Which gas makes a voice squeaky because sound travels nearly three times faster through it than through air?
Helium
Helium does not change how fast the vocal cords vibrate. Faster sound in the throat and mouth boosts the high parts of the voice, which changes its tone.
Q 08A person's recorded voice sounds higher than expected because it lacks vibrations carried through what?
The skull
The skull carries low notes better than air does, so the voice you hear while speaking is deeper and fuller than the one everybody else hears.
Q 09Which land animals keep in touch across several kilometres using rumbles too low for people to hear?
Elephants
Elephants make these calls below about 20 vibrations a second, under the floor of human hearing, and they may carry as far as 10 kilometres.
Q 10Which stock sound effect, recorded for a 1951 film, turns up in Star Wars and Indiana Jones movies?
Wilhelm scream
The Wilhelm scream began as a take labelled "Man getting bit by an alligator, and he screams". Its name comes from Private Wilhelm, a character in a 1953 western.
Q 11Which familiar sound is a shock wave from air heated in an instant to nearly 30,000 degrees Celsius?
Thunder
Thunder trails its flash because light arrives almost at once while sound needs about three seconds per kilometre, so the gap tells you how far away the strike was.
Q 12Which skill lets bats and dolphins find prey by listening for their own calls bouncing back?
Echolocation
Echolocation was only given its name in the 1940s by zoologist Donald Griffin, who helped show that bats steer by calls too high for people to hear.
Q 13The drop in the note of an ambulance siren as the vehicle speeds past is named after which physicist?
Christian Doppler
Q 21Which branch of science, named from a Greek verb meaning 'to hear', is the study of sound?
Acoustics
Acoustics covers every kind of mechanical wave in gases, liquids and solids, including vibrations far too high or too low for anyone to hear.
Q 22Which throat organ enlarges in boys at puberty, deepening the voice and pushing out the Adam's apple?
Larynx
Larynx is the proper name for the voice box. As it grows, the vocal cords inside become longer and thicker, which is what lowers the voice.
Q 23Which snail-shaped part of the inner ear turns sound vibrations into nerve signals sent to the brain?
Cochlea
Cochlea comes from the Latin for snail shell. In humans the spiral coils two and three-quarter times around its core.
Christian Doppler described the effect in 1842. Three years later Buys Ballot tested it with musicians playing one steady note on a moving train.
Q 14The decibel, the unit used to measure loudness, is named in honour of which inventor?
Alexander Graham Bell
Alexander Graham Bell, the telephone pioneer, gave his name to the bel, and a decibel is a tenth of one. Every rise of 10 decibels means ten times the sound power.
Q 15Which quality of a note, high or low, depends on how many times each second the sound wave vibrates?
Pitch
Pitch climbs as the vibrations get faster. The A above middle C that musicians use as a standard vibrates 440 times each second.
Q 16Which kind of sound, too high for human ears, do doctors use to make images of unborn babies?
Ultrasound
Ultrasound lies above roughly 20,000 vibrations a second. A scanner sends pulses into the body and builds a moving picture from the reflections that return.
Q 17Which listening device did French doctor René Laennec invent in 1816 as a plain wooden cylinder?
Stethoscope
Stethoscope in hand, Laennec no longer had to press his ear to a woman's chest to hear her heart, which had made him uncomfortable.
Q 18Male crickets make their chirping song by rubbing together which parts of the body?
Wings
Wings, not legs: male crickets scrape specially textured parts of the two front ones together. The song is meant to attract females.
Q 19The 'ocean' heard inside a seashell held to the ear is really what, made louder by the hollow shell?
Surrounding sounds
Surrounding sounds are caught and boosted by the hollow shell. An empty cup, or a hand cupped over the ear, does the same job.
Q 20Which term describes words such as 'buzz' and 'cuckoo' that imitate the sounds they name?
Onomatopoeia
Onomatopoeia comes from Greek words meaning 'name-making'. Languages hear things differently: an English frog says ribbit, while an ancient Greek one went brekekekex.
Q 24Which technology, developed in World War I to find submarines, locates objects with pulses of sound?
Sonar
Sonar is short for sound navigation and ranging. Interest in finding objects underwater by sound seems to have been spurred by the Titanic disaster of 1912.
Q 25Which American test pilot first flew faster than sound, in the rocket-powered Bell X-1 in 1947?
Chuck Yeager
Chuck Yeager made the flight with two ribs broken in a riding fall two nights earlier. His plane was named Glamorous Glennis after his wife.
Q 26Which airliner, retired in 2003, carried passengers across the Atlantic at twice the speed of sound?
Concorde
Concorde more than halved journey times, but the shock wave it dragged across the ground kept its fastest flying to routes over the ocean.
Q 27Which effect lets a singer shatter a wine glass by holding a note at the glass's natural frequency?
Resonance
Resonance builds when each push arrives in step with the last, as with well-timed shoves on a playground swing, until the glass flexes too far and breaks.
Q 28Which Australian bird can mimic chainsaws, car alarms and camera shutters as well as other birds?
Lyrebird
Lyrebird song mixes the bird's own notes with sounds heard nearby. The birds copy the calls of whole flocks, and of koalas and dingoes, with great fidelity.
Q 29Which animal makes the loudest sound of any creature, a click used to hunt squid in the deep sea?
Sperm whale
Sperm whale clicks are made by the huge organ complex in the animal's head, which focuses them into a narrow beam for finding prey in the dark.
Q 30Francis Galton's 1876 whistle, too high for human ears, is used to train which animals?
Dogs
Dogs hear notes well above the human limit, as do cats. Galton built the whistle to test the hearing range of different animals.