10 most difficult technology riddles A list of ten (out of 231) technology related questions that are the most often answered incorrectly Technology quiz What does the logo of Citroën symbolize?Chevron-shaped gear. The origin of the logo may be traced back to a trip made by the 22-year-old André Citroën to Łódź city, Poland, where he discovered an innovative design for a chevron-shaped gear used in milling. He bought the patent for its application in steel and started his company which initially produced gears.very hard 21% Spruce, typical for the VosgesSpruce, typical for the Vosges18%Chevron-shaped gearChevron-shaped gear21%Upwards pointing arrow - strive for perfectionUpwards pointing arrow - strive for perfection42%Chevrons referring to the military connections of the companyChevrons referring to the military connections of the company17%Created by: Katarzyna Dąbrowska. Statistics based on 5432 answers in 3 languages »logo riddles » Which type of transmission uses the shortest waves?Satellite TV. The Ku band is the portion of the electromagnetic spectrum in the microwave range of frequencies from 12 to 18 gigahertz (GHz). Ku band is primarily used for satellite communications, most notably for fixed and broadcast services, and for specific applications such as NASA's Tracking Data Relay Satellite used for both space shuttle and International Space Station very hard 23% GSM telephonyGSM telephony15%CB radioCB radio34%VHF radioVHF radio25%satellite TVsatellite TV23%Created by: Tschuka. Statistics based on 4213 answers in 3 languages »TV riddles » What country has got the most permanent research stations in Antarctica?Argentina mantains the most permanent polar stations - 6|Chile - 5|Russia - 5|Poland - 1very hard 25% ArgentinaArgentina25%ChileChile14%PolandPoland15%RussiaRussia44%Created by: lukasz Poland. Statistics based on 1033 answers in 3 languages »Chile riddles » Which large IT company doesn't have its headquarters in the Silicon Valley?IBM is a company based in New York. The history of IBM is longer than the history of Silicon Valley.very hard 25% IBMIBM25%AMDAMD25%GoogleGoogle28%AppleApple20%Created by: Ninjai. Statistics based on 3913 answers in 2 languages »California riddles » When the Japanese high speed train Shinkansen began service?1964. The Tōkaidō Shinkansen began service on 1 October 1964, in time for the first Tokyo Olympics. The first Shinkansen trains, the 0 series, ran at speeds of up to 210 km/h. Now the maximum operating speed is 320 km/h, with a test run of a world record 603 km/h reached in 2015.very hard 26% 1964196426%1974197432%1984198428%1994199413%Created by: Ninjai. Statistics based on 2629 answers in 2 languages »Japan riddles » What is the third by volume, after nitrogen and oxygen, component of dry air?Argon represents 0.934% of the earth's atmosphere and 1.28% of its mass. Ar-40 is an isotope that makes up the majority of the earth's argon. It is a result of decaying of another elements' unstable isotopes, mainly Potassium-40.very hard 26% carbon dioxidecarbon dioxide51%methanemethane3%ozoneozone18%argonargon26%Created by: Rafał. Statistics based on 3555 answers in 3 languages »atmosphere riddles » What was the name of the first semi-automatic pistol?Borchardt C93. The Borchardt C-93 semi-automatic pistol was designed by Hugo Borchardt in 1893 based upon the Maxim toggle-bolt design.. With about 1,100 manufactured by Loewe and nearly 2,000 more produced by Deutsche Waffen und Munitionsfabriken, the Borchardt C-93 was the first mass-produced semi-automatic pistol. very hard 26% Glock 17Glock 1739%AK-74AK-745%Borchardt C93Borchardt C9326%None of the above is a semi-automatic pistolNone of the above is a semi-automatic pistol28%Created by: Tschuka. Statistics based on 2806 answers in 2 languages »World War I riddles » Space Ship One, the first private manned space ship, is known for its unusual fuel. What is it?Rubber. SpaceShipOne is an experimental air-launched rocket-powered aircraft with suborbital flight capability at speeds of up to 900 m/s using a hybrid rocket motor. Tier One uses a hybrid rocket motor supplied by SpaceDev, with solid hydroxyl-terminated polybutadiene (HTPB, or rubber) fuel and liquid nitrous oxide oxidizer. It generates 88 kN (20,000 lbf) of thrust, and can burn for about 87 s (1.45 min).very hard 27% waterwater9%hydrogenhydrogen36%sodium hydroxidesodium hydroxide26%rubberrubber27%Created by: Tschuka. Statistics based on 1591 answers in 2 languages »rockets riddles » What was the first car equipped with an airbag?Cadillac de Ville. 1974 in Cadillac de Ville also saw the introduction of the optional "Air Cushion Restraint System". Known today as airbags, this option provided protection for front seat occupants in the case of a frontal collision. One bag was located in the steering wheel, the other in the dashboard in front of the front seat passenger. very hard 27% Volvo 66Volvo 6643%Mercedes-Benz W126 Mercedes-Benz W126 19%Chevrolet CitationChevrolet Citation10%Cadillac de VilleCadillac de Ville27%Created by: Tschuka. Statistics based on 150 answers in 2 languages »cars riddles » Are gas fittings tightened clockwise or anti-clockwise?It depends on the gas. Some gas fittings use reverse threads to prevent disastrous misconnections. For example, oxygen fittings are right-handed, but acetylene and other flammable gases use left-handed fittings.very hard 28% clockwiseclockwise23%anti-clockwiseanti-clockwise39%it depends on the gasit depends on the gas28%there is no standardthere is no standard8%Created by: globalquiz.org. Statistics based on 4452 answers in 4 languages »mechanics riddles » Play technology quiz and see all the questions.