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 .......

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

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Computer Basic Information
What is the main difference between a mainframe and a super computer?

Super computer is much larger than mainframe computers.
Supercomputers are focused to execute as many programs as possible while mainframe uses its power to execute few programs as fast as possible.
Supercomputers are focused to execute few programs as fast as possible while mainframe uses its power to execute as many programs concurrently.
Super computers are much smaller than mainframe computers.
None of these

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