Computer Basic Information
An essential difference between the operating system that runs a typical desktop computer and the operating system that runs a typical PDA is that .......

the desktop computer has an OS whereas a PDA does not.
the desktop OS manages hardware resources whereas the PDA OS does not.
the desktop OS has a graphical user interface whereas the PDA OS does not.
the desktop OS can run several programs simultaneously whereas the PDA OS cannot.
None of these

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Computer Basic Information
In a punched card system, data is processed by a

None of these
accounting machine, posting machine, and billing machine
sorter, posting machine, and billing machine
accounting machine, keypunch machine, and sorter
keypunch machine, sorter, and posting machine

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