10 most difficult computer science riddlesComputer science quiz
From which company Steve Jobs took the idea for the graphical user interface with a mouse?
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.
Where does the symbol @ come from?
this symbol was created for the needs of e-mail
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.
Who perpetrated the "biggest military computer hack of all time" in 2002?
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.
What was the first computer virus in the DOS system?
Storm Worm virus
I Love You 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.
When was the first electronic computer created and what was its name?
in 1945 - Eniac
in 1943 - Colossus
in 1939 - Atanasoff-Berry ABC
in 1941 - Zuse's Z3 machine
Atanasoff and Berry's computer work was not widely known until it was rediscovered in the 1960s, amidst conflicting claims about the first electronic computer. At that time ENIAC, created by John Mauchly and J. Presper Eckert, was considered to be the first computer in the modern sense. In 1973 a U.S. District Court invalidated the ENIAC patent and concluded that the ENIAC inventors had derived the design of the electronic digital computer from Atanasoff 's work.
What does not include, Unix time?
of leap years
of leap hours
of leap minutes
of leap seconds
Unix time is a date-time format used to express the number of milliseconds that have elapsed since January 1, 1970 00:00:00 (UTC). Unix time does not handle the extra seconds that occur on the extra day of leap years. Currently, the difference is about 2 to 3 milliseconds a day and is adjusted on average once a year.
Who is the forerunner of virtual reality?
Myron Krueger is an American computer artist who developed early interactive works. He is also considered to be one of the first generation virtual reality and augmented reality researchers. Krueger went on to develop Metaplay, an integration of visuals, sounds, and responsive techniques into a single framework. In 1971, his "Psychic space" used a sensory floor to perceive the participants' movements around the environment.
When was the first e-mail message sent?
The service consisting in sending text messages between computers was invented in 1971 by Ray Tomlinson. Previously, mail could be sent only to others who used the same computer. To achieve this,"Ray" he used the @ sign to separate the user name from the name of their machine, a scheme which has been used in email addresses ever since.
Who is credited as the first computer programmer?
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.