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

polarized light
unpolarized concentric light
None of these
coloured light
laser

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Computer Basic Information
The MS-DOS operating system is a .....

command-driven interface, multi-tasking operating system
graphical user interface, single-tasking operating system
graphical user interface, multi-tasking operating system
None of these
command-driven interface, single-tasking operating system

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