Operating System (OS)
The ability of an operating system to control the activities of multiple program at the same time is called

Multiprocessing
Multioperating
Multitasking
Multipaging

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Operating System (OS)
The advantage of a command processor running only built-in commands is:

None of these
the processing is much faster than would other-wise be the case when user defined commands are used
users can create system programs and run them as commands
the command set being common across different hardware configurations
flexibility to the users in running lists of commands by simply collecting them in named batch command files

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Operating System (OS)
File record length

should always be fixed
should be chosen to match the data characteristics
depends upon the size of the file
Should always be variable
None of these

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