10 most difficult computer science riddles A list of ten (out of 49) computer science related questions that are the most often answered incorrectly Computer science quiz From which company Steve Jobs took the idea for the graphical user interface with a mouse?Xerox. Known as a photocopier manufacturer, Xerox created Alto in 1973 - the first computer with a graphical user interface (GUI) at the PARC development center in Palo Alto, California. Steve Jobs saw Xerox PARC product, such as the GUI, either on a tour or at a trade show. He then used the PARC GUI implementation without permission, to create the Apple Lisa and the original Mac OS / Macintosh GUI.very hard 22% XeroxXerox22%MicrosoftMicrosoft24%AmigaAmiga26%IBMIBM26%Created by: Tschuka. Statistics based on 1179 answers in 2 languages » When was the first computer created and what was its name?In 1939 r - Atanasoff-Berry ABC. Atanasoff and Berry's computer work was not widely known until it was rediscovered in the 1960s, amidst conflicting claims about the first instance of an electronic computer. At that time ENIAC, that had been created by John Mauchly and J. Presper Eckert, was considered to be the first computer in the modern sense, but in 1973 a U.S. District Court invalidated the ENIAC patent and concluded that the ENIAC inventors had derived the subject matter of the electronic digital computer from Atanasoff very hard 23% in 1945 r - Eniacin 1945 r - Eniac33%in 1943 r - Colossus in 1943 r - Colossus 26%in 1939 r - Atanasoff-Berry ABCin 1939 r - Atanasoff-Berry ABC23%in 1941 - Zusego Z3 machinein 1941 - Zusego Z3 machine16%Created by: Tschuka. Statistics based on 242 answers in 2 languages »computers 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 3908 answers in 2 languages »California riddles » Where does the symbol @ come from?From Latin. The sign comes from a Latin ligature replacing in the medieval and Renaissance commercial manuscripts the word "at" - and denoting the recipient of the parcel.He first appeared in 1448 in a document with a register of wheat deliveries from the Kingdom of Castile to the Kingdom of Aragón.very hard 26% from Arabicfrom Arabic14%from Greekfrom Greek14%from Latinfrom Latin26%this symbol was created for the needs of e-mailthis symbol was created for the needs of e-mail43%Created by: Tschuka. Statistics based on 351 answers in 3 languages »internet riddles » Who perpetrated the "biggest military computer hack of all time" in 2002?Gary McKinnon . McKinnon was accused of hacking into 97 United States military and NASA computers. McKinnon states that he was merely looking for evidence of free energy suppression and a cover-up of UFO activity and other technologies potentially useful to the public. Web and print media across the UK ran a campaign to prevent Gary McKinnon's extradition to the U.S.very hard 26% Gary McKinnon Gary McKinnon 26%Steven Raymond Steven Raymond 17%Kevin PaulsenKevin Paulsen27%Chris ZboralskiChris Zboralski28%Created by: Tschuka. Statistics based on 304 answers in 3 languages »computers riddles » What was the first computer virus in the DOS system?Brain virus. Brain is the industry standard name for a computer virus that was released in its first form in January 1986 and is considered to be the first computer virus for MS-DOS. It infects the boot sector of storage media formatted with the DOS File Allocation Table (FAT) file system. Brain was written by brothers, Basit Farooq Alvi and Amjad Farooq Alvi, from Lahore, Punjab, Pakistan.very hard 27% melissa virusmelissa virus8%Storm Worm virusStorm Worm virus21%I Love You virusI Love You virus42%Brain virusBrain virus27%Created by: Tschuka. Statistics based on 422 answers in 2 languages »computers riddles » Who is credited as the first computer programmer?Ada Lovelace. She was an English mathematician and writer, chiefly known for her work on Charles Babbage's proposed mechanical general-purpose computer, the Analytical Engine. She was the first to recognise that the machine had applications beyond pure calculation, and published the first algorithm intended to be carried out by such a machine.very hard 27% Ada LovelaceAda Lovelace27%Charles BabbageCharles Babbage42%Herman HollerithHerman Hollerith18%Konrad Zuse Konrad Zuse 12%Created by: Tschuka. Statistics based on 222 answers in 3 languages »computers riddles » What does "USB" stand for?Universal Serial Bus. USB - short for Universal Serial Bus, is an industry standard that defines cables, connectors and communications protocols for connection, communication, and power supply between computers and devices.very hard 28% Universal Satellite BusUniversal Satellite Bus8%Universal System BusUniversal System Bus29%Universal Serial BusUniversal Serial Bus28%Universal Software BusUniversal Software Bus33%Created by: Tschuka. Statistics based on 328 answers in 3 languages »informatics riddles » the ancestor of the Internet was ...Arpanet. The ARPANET project led to the development of protocols for internetworking, by which multiple separate networks could be joined into a single network of networks. ARPANET development began with two network nodes which were interconnected between the Network Measurement Center at the University of California, Los Angeles in 1969very hard 30% AlohanetAlohanet11%ArpanetArpanet30%UsenetUsenet31%BitnetBitnet25%Created by: Tschuka. Statistics based on 409 answers in 3 languages »computers riddles » The inventor of the computer mouse is ...Douglas Engelbart. The first computer mouse was conceived of in the early 1960’s by Douglas Engelbart , then a Director of Augmentation Research Center (ARC) at Stanford Research Institute (SRI), in Menlo Park, California. very hard 32% John KemenyJohn Kemeny17%Fernando CorbatóFernando Corbató18%Dennis RitchieDennis Ritchie31%Douglas EngelbartDouglas Engelbart32%Created by: Tschuka. Statistics based on 296 answers in 3 languages »computers riddles » Play computer science quiz and see all the questions.