Electronics
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50 free Electronics trivia questions with answers — science & nature quiz, new questions added Oct 2026.
Electronics is barely more than a century old, yet it has remade daily life faster than any technology before it. A handful of glowing glass tubes in a laboratory became room-sized computers, then pocket music players, then the phone in your hand. Almost every step has a good story behind it: lucky accidents, bitter rivalries and inventions that their own makers thought were useless. This quiz covers the whole field. Some questions test the fundamentals, such as what common components do, how circuits behave and what the units and abbreviations mean. Others follow the evolution of electronics through its inventors, laboratories and companies, and the rest revisit the consumer gadgets and electronic games that people grew up with. It is written for hobbyists, students brushing up on basic electronics, and anyone who likes knowing how everyday technology came to be. The questions run from easy to technical, and every answer comes with a short explanation, so it works equally well as a solo challenge, a classroom warm-up or a trivia night round.
30 of 50 questions with answers and explanations. Play the quiz
Q 01What name did Sony give the portable cassette player it launched in 1979 for private listening on the move?
Walkman
Walkman began as a modified Pressman, Sony's small recorder for journalists. Overseas offices disliked the name, so it first went on sale in the United States as the Sound-about.
Q 02Bluetooth wireless technology takes its name from a 10th-century king who united the tribes of which country?
Denmark
Denmark's tribes were united by King Harald Bluetooth, and an Intel engineer borrowed the nickname for a standard meant to unite devices. The logo merges the runes for Harald's initials.
Q 03Which kitchen appliance is said to have grown from Percy Spencer noticing a radar set melt the candy bar in his pocket?
Microwave oven
The microwave oven took shape once Spencer tried popcorn kernels next, which became the first microwaved popcorn. His employer Raytheon sold the first model, the Radarange, in 1947.
Q 04At which photographic film company did engineer Steven Sasson build the first self-contained digital camera in 1975?
Kodak
Kodak's prototype weighed 8 pounds and took 23 seconds to record each 0.01-megapixel image onto a cassette tape.
Q 05Which 1978 Milton Bradley electronic game asks players to repeat ever-longer sequences of lights and tones?
Simon
Simon was launched with a party at New York's Studio 54 nightclub. Its tones were modeled on the notes of a bugle, so every sequence sounds in tune however long it grows.
Q 06Which South Korean electronics giant began in 1938 as a small trading company dealing in dried fish and noodles?
Samsung
Samsung means 'three stars' in Korean, and the group did not enter the electronics industry until the late 1960s, three decades after it was founded.
Q 07The 2014 Nobel Prize in Physics honored the inventors of an efficient LED of which color, the key to white lamps?
Blue
Blue was the missing color for three decades after red and green LEDs appeared. A blue LED coated with a phosphor gives the white light of modern bulbs.
Q 08Which mineral vibrates 32,768 times a second to keep time in most electronic watches and clocks?
Quartz
Quartz in nearly every watch is cut into a tiny tuning-fork shape. Its frequency is a power of two, so a cheap counter can halve it again and again down to one pulse a second.
Q 09Which music player did Steve Jobs unveil in 2001 with the promise of '1,000 songs in your pocket'?
iPod
The iPod was developed in less than a year and announced as a Mac-compatible product with a 5 GB hard drive.
Q 10Which rechargeable battery chemistry, honored by the 2019 Nobel Prize in Chemistry, powers most smartphones and laptops?
Lithium-ion
Lithium-ion cells first went on sale in 1991, and laureate John Goodenough was 97 when he shared the prize for making them possible.
Q 11At which New Jersey research laboratory did Bardeen, Brattain and Shockley build the first working transistor in 1947?
Bell Labs
Bell Labs' three inventors shared the 1956 Nobel Prize in Physics. Their first device was a point-contact design pressed onto a sliver of germanium.
Q 12Which Intel co-founder predicted in 1965 that the number of components on a chip would keep doubling at a regular pace?
Gordon Moore
Gordon Moore first saw the count doubling every year, then in 1975 revised his forecast to every two years. The chip industry treated his law as a target for decades.
Q 13At which company did new hire Jack Kilby build the first integrated circuit in 1958 while colleagues were on vacation?
Texas Instruments
Q 21Which two-terminal component, drawn as a triangle pointing at a bar, lets current flow in only one direction?
Diode
Diode comes from the Greek for 'two' and 'path', a name coined in 1919. Its plumbing equivalent is the check valve, which lets water through one way only.
Q 22Which component, measured in farads, descends from the water-filled Leyden jars of the 1740s?
Capacitor
A capacitor was long called a condenser, a name that survives in the condenser microphone. Pieter van Musschenbroek, jolted by an early Leyden jar, wrote that he would not take a second shock for the kingdom of France.
Q 23Which type of circuit converts the alternating current from a wall socket into the direct current that electronics need?
Rectifier
Texas Instruments had only just hired Kilby, so he had not yet earned a vacation of his own. His chip won him a share of the 2000 Nobel Prize in Physics.
Q 14The Intel 4004, the first commercial microprocessor, was created for a Japanese company that made which product?
Calculators
Calculators from Busicom were planned around a larger set of custom chips until Intel proposed one programmable processor. Intel later repaid Busicom's $60,000 so it could sell the chip to others.
Q 15Which American inventor's Audion, the first triode vacuum tube, could amplify a signal thanks to its added control grid?
Lee de Forest
Lee de Forest slipped a wire grid into an existing two-electrode tube, yet the Audion found little use until others recognized around 1912 how well it could amplify.
Q 16Which room-sized computer, dedicated at the University of Pennsylvania in 1946, ran on about 18,000 vacuum tubes?
ENIAC
ENIAC burned out several tubes almost every day, which left the machine out of action about half the time. The press of the day nicknamed it the 'Giant Brain'.
Q 17Which American inventor built the first working all-electronic television system, sending a straight line in 1927?
Philo Farnsworth
Philo Farnsworth was a farm boy who took the idea of scanning a picture line by line from the back-and-forth rows of a plowed field.
Q 18Which company's engineer Martin Cooper made the first handheld mobile phone call from a Manhattan sidewalk in 1973?
Motorola
Motorola's Cooper cheekily placed that first call to his counterpart at a rival firm. It then took him another ten years to bring the phone to market.
Q 19Which company introduced the compact cassette in 1963 and later co-developed the compact disc with Sony?
Philips
Philips let other manufacturers use its patented cassette design free of charge, which helped the little tape become a worldwide standard.
Q 20The Regency TR-1 of 1954 was the first transistor version of which consumer product sold to the public?
Radio
Radio sets had stayed with vacuum tubes because a transistor cost about $20 against $1 for a tube. Until the TR-1, only hearing aids had made the switch.
A rectifier leaves the current flowing one way but pulsing, so power supplies smooth it afterward. An inverter does the opposite job, turning DC back into AC.
Q 24On the color code painted on resistors, which color band stands for the digit zero?
Black
Black stands for zero and brown for one. From two to seven the bands simply follow the order of the rainbow, which makes the code easier to memorize.
Q 25Traditional solder for joining electronic components is an alloy of lead and which other metal?
Tin
Tin makes up 63% of the classic electronics blend, which has the lowest melting point of any such alloy at 183 °C. Health rules have since pushed makers toward lead-free solder.
Q 26Which chemical element, the second most abundant in Earth's crust after oxygen, is the main material of computer chips?
Silicon
Silicon makes up about 28% of Earth's crust, locked in sand and rock, and it gave California's Santa Clara Valley its famous nickname.
Q 27What is the term for deliberately adding impurities such as boron to a semiconductor to change how it conducts?
Doping
Doping needs only a trace: even the most heavily doped silicon holds impurity atoms on the order of parts per thousand, yet that transforms how it carries current.
Q 28A bipolar junction transistor has three terminals: the emitter, the collector and which third one in the middle?
Base
The base is a thin middle layer, and a small current fed into it controls a much larger one between the other two terminals. That is how the device amplifies.
Q 29Which precious metal is plated onto the contacts of many electronic connectors because it resists corrosion so well?
Gold
Gold plating on connectors is the metal's most important industrial job, though audio experts often dismiss gold-tipped cables as a marketing ploy for ordinary listeners.
Q 30Which unit of electrical resistance is written with the Greek capital letter omega?
Ohm
Ohm and omega sound alike, which is exactly why William Preece suggested the symbol in 1867. The unit honors the German physicist Georg Ohm.