Operating System (OS)
An incremental backup

None of these
should be done each month
saves only files that have recently changed
uses more tapes
saves all files

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Operating System (OS)
Feed back queue

dispatch tasks according to execution characteristics
are very easy to implement
require manual intervention to implement properly
are used to favor real-time tasks
None of these

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Operating System (OS)
The instruction register

is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
None of these
contains the address of the memory location that is to be read from or stored into.
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".
is a hardware memory device which denotes the location of the current instruction being executed.

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