Bluetooth Trivia
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60 free Bluetooth trivia questions with answers — technology quiz, new questions added Aug 2026.
This Bluetooth trivia quiz covers the wireless standard that quietly connects billions of headphones, keyboards, cars and watches. The easy questions are ones any gadget owner can take a swing at: which Viking king the technology is named after, what the logo is made of, what frequency band it uses, roughly how far a phone can reach, and which company started it all in Lund, Sweden. From there it moves into the engineering: frequency hopping, piconets, classes and power, pairing methods and the profiles that let a phone talk to a headset or a heart-rate monitor. The harder end is for engineers and tech-history fans: the two names that were supposed to replace the Bluetooth placeholder, the five founding companies of the SIG, the first phone and laptop to ship with it, the Nokia project that became Bluetooth Low Energy, the version that added Enhanced Data Rate, secure simple pairing, Auracast, mesh, the 1.78 km range record, bluejacking, bluesnarfing and the 2017 BlueBorne exploits. Every answer was checked against encyclopaedia entries on the standard, its inventors and its history before publishing, and the supporting sentence is stored with each question. If you enjoy this one, try our Wi-Fi, smartphone and computer history quizzes next.
30 of 60 questions with answers and explanations. Play the quiz
Q 01Bluetooth is named after a 10th-century king of which country?
Denmark
Denmark's Harald Bluetooth also brought Norway under his crown, and that record of joining rivals is why engineers borrowed his nickname for a standard meant to unite devices.
Q 02The Bluetooth logo joins two characters from which old writing system?
Norse runes
Norse runes for H and B, the initials of the Viking king who gave the technology its name, are laid over each other to form the symbol.
Q 03Bluetooth radios operate in which frequency band?
2.4 GHz
2.4 GHz is one of the few bands left open to unlicensed radios almost everywhere in the world, so one Bluetooth design works from country to country and its owner needs no radio licence.
Q 04The low-power radios in typical Bluetooth earbuds are designed to reach roughly how far?
About 10 metres
About 10 metres is the design range of the Class 2 radios in most earbuds, which transmit at only 2.5 milliwatts to save power, and walls between the two devices cut it shorter still.
Q 05Which kitchen appliance can make Bluetooth audio stutter whenever it is running?
A microwave oven
A microwave oven heats food with radio waves at almost the same frequency Bluetooth uses, and the little that escapes its metal shielding can drown out nearby earbuds until you step a few metres away.
Q 06Bluetooth was developed in Sweden, but its credited inventor, Jaap Haartsen, comes from which country?
Netherlands
The Netherlands is Haartsen's home: born in The Hague, he joined a phone maker's lab in Lund, Sweden, and in 1994 was asked to find a short-range radio link that would help sell more phones.
Q 07Who proposed Bluetooth as the codename for the new short-range radio standard?
Jim Kardach of Intel
Jim Kardach of Intel offered it as a stopgap codename: the king, he said, was famous for uniting Scandinavia, just as the new standard was meant to unite the PC and mobile phone industries.
Q 08Bluetooth was only a placeholder codename, so why did it become the permanent name?
Both planned replacements fell through
Both planned replacements fell through: PAN threw up tens of thousands of hits in a search, and RadioWire could not be cleared as a trademark in time for the launch.
Q 09Which historical novel about Vikings sparked the conversation that led to the Bluetooth name?
The Long Ships
The Long Ships, Frans Bengtsson's Swedish adventure novel, features King Harald Bluetooth's court. A Swedish engineer retold it to an American colleague on a Toronto pub crawl, and the king's name stuck.
Q 10Which Japanese laptop maker was among the five companies that founded the Bluetooth SIG in 1998?
Toshiba
Toshiba and IBM built laptops and two Nordic firms built phones, so the founders covered both ends of the link the standard was made for; a chipmaker completed the five.
Q 11Despite its Nordic roots, where is the Bluetooth Special Interest Group now headquartered?
Kirkland, Washington
Kirkland, Washington, a suburb of Seattle, houses the SIG, a not-for-profit that writes the specifications and licenses the name but makes no products itself.
Q 12About how many companies belonged to the Bluetooth SIG by 2024?
About 40,000
About 40,000 companies had joined by 2024, because any firm that wants to put the Bluetooth name on a product has to become a member first.
Q 13In 2024 a US startup made the first Bluetooth connection from the ground to what?
A satellite in orbit
Q 21What is the small ad hoc network formed when Bluetooth devices connect, with one device setting the timing for the rest?
A piconet
A piconet, literally a tiny network, puts one device in charge of the timing for up to seven others, which is how a single phone can serve earbuds, a watch and a car at once.
Q 22Bluetooth Low Energy was designed so that a small sensor could run for months or years on what?
A coin-cell battery
A coin-cell battery, the kind found in a watch, can keep a low-energy sensor going for months or even years. The catch is that this low-power mode is separate from classic Bluetooth, so older gear cannot talk to it.
Q 23In a 2004 experiment, from about how far away did security researchers manage to connect to a phone's Bluetooth?
A satellite in orbit some 600 km up picked up an ordinary Bluetooth chip running patched software, a radio most people struggle to keep connected across a room.
Q 14What kind of product does Bluetooth's original developer count as the first consumer device shipped with it?
A hands-free headset
A hands-free headset shipped in 2000, a fitting first, since the project began as a radio link between mobile phones and their accessories.
Q 15Which Star Wars droid became a hit 2015 toy that owners steer from a phone over Bluetooth?
BB-8
BB-8 reached toy shops because Disney's chief executive showed a robot-ball startup secret images of the droid in 2014, before the public knew it existed, and asked whether they could build it.
Q 16A lost AirTag has no GPS, so how does its faint Bluetooth signal reach an owner miles away?
Nearby iPhones relay it
Nearby iPhones relay it: any Apple device that hears the tag passes its own location to the owner, anonymously, through a network that was close to a billion devices strong at the 2021 launch.
Q 17An early form of frequency hopping, the radio trick Bluetooth relies on, was patented in 1942 by which Hollywood star?
Hedy Lamarr
Hedy Lamarr, the Austrian-born film star, patented it with composer George Antheil as a way to steer Allied torpedoes by radio; she entered the National Inventors Hall of Fame in 2014.
Q 18Which games console, launched in 2017 with Bluetooth controllers, could not send sound to Bluetooth headphones until a 2021 update?
Nintendo Switch
The Nintendo Switch had the radio all along, for its controllers; a September 2021 update finally let headphones pair, at the price of a two-controller limit while they are connected.
Q 19What does classic Bluetooth gain by hopping channels 1,600 times a second?
Less interference
Less interference: the link shares crowded, unlicensed airwaves with home routers and much else, so it never stays on one of its 79 channels long enough for a clash to matter.
Q 20A police-tested 2019 app called Bluetana sniffs out Bluetooth card skimmers that thieves hide inside what?
Gas station pumps
Gas station pumps: a skimmer wired inside one sends out stolen card numbers over Bluetooth, so the thief never has to open the pump again and only has to pull up and download them.
1.78 km
1.78 km, a little over a mile: in August 2004 researchers aimed a directional antenna at a phone and connected to it from far beyond anything its short-range radio was built for.
Q 24Why must you pair again after your phone forgets a Bluetooth device?
The shared key was deleted
The shared key was deleted: pairing leaves both devices holding a secret called a link key, and once either side erases it the other can no longer prove who it is.
Q 25Older Bluetooth headsets with no keypad shipped with a fixed pairing PIN, usually which of these?
0000 or 1234
0000 or 1234 covered most of them: a headset has no way to type a code, so makers hard-wired an easy one, which is why phones still suggest trying those two first.
Q 26Some headphones pair over Bluetooth the moment you tap them against a phone; what makes that tap work?
A built-in NFC tag
A built-in NFC tag does the introduction: NFC only reaches an inch or two, so touching two gadgets together shows exactly which pair you mean and no code or menu is needed.
Q 27Why do two phones sometimes show a matching six-digit number during Bluetooth pairing?
To catch an impostor between them
To catch an impostor between them: a device secretly relaying the traffic would make each screen show a different number, so the check only helps if you actually look before tapping yes.
Q 28Headphones with no screen or keys usually pair by which Bluetooth method?
Just Works
Just Works asks for nothing because such devices cannot show or accept a code, and the price is that nothing confirms the other end is really the gadget you meant.
Q 29What did the EDR in Bluetooth 2.0 + EDR stand for?
Enhanced Data Rate
Enhanced Data Rate tripled the raw speed from 1 to 3 Mbit/s, though once the overheads are counted real transfers top out at about 2.1.
Q 30Bluetooth 3.0 + HS reached 24 Mbit/s by handing bulk data to which other radio technology?
802.11 Wi-Fi
802.11 Wi-Fi did the heavy lifting: Bluetooth only set up the connection and then handed the big transfer to the other radio, so the headline 24 Mbit/s never actually travelled over Bluetooth.