Computer Basic Information
A beam of light used to record and retrieve data on optical disks is known as

None of these
unpolarized concentric light
polarized light
coloured light
laser

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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 OS manages hardware resources whereas the PDA OS does not.
the desktop computer has an OS whereas a PDA 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.

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