Which is not an input/output device?
Answer: D
Correct answer: Magnetic tapes
Printers, readers and displays all move data between the machine and the outside world, so they are input or output devices. Magnetic tape is a storage medium: it keeps data for the machine’s own later use rather than presenting it to a user.
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Which among the following has low speed storage?
Answer: D
Correct answer: Magnetic tapes
Magnetic tape is the slowest of these, because it can only be accessed sequentially - reaching a record means winding past everything recorded before it, which may take minutes. Disks and CD-ROMs are direct access, and extended storage is semiconductor memory.
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Who is known as ‘Father of computers’?
Answer: B
Correct answer: Charles Babbage
Charles Babbage is called the father of computers for the Analytical Engine he designed from 1837 - a general-purpose machine with a mill for calculation, a store for numbers, and punched cards carrying both program and data. Aiken, Atanasoff and Bush built later machines that owed much to those ideas.
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