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Operating System Practice Test Questions For All Competitive Exams
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An operating system (OS) is the program that, after being initially loaded into the computer by a boot program, manages all of the other application programs in a computer. The application programs on the computing device make use of the operating system by making requests for services through a defined application program interface (API).
 

Operating System Practice Test Questions For All Competitive Exams
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1. In MS-DOS, which of the following commands is used to delete directory with all sub-directories and files?

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