Operating System (OS)
The primary purpose of an operating system is:

To allow people to use the computer
To make computers easier to use
To make the most efficient use of the computer hardware
To keep systems programmers employed

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Operating System (OS)
Backups should be done

as several image copies, followed by an incremental
None of these
daily for most installations
as several incrementals, followed by an image copy
weekly for most installations

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Operating System (OS)
The Memory Buffer Register (MBR)

is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
is a hardware memory device which denotes the location of the current instruction being executed.
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".
None of these
contains the address of the memory location that is to be read from or stored into.

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Operating System (OS)
The main function of the dispatcher (the portion of the process scheduler) is

suspending some of the processes when the CPU load is high
swapping a process to the disk
bring processes from the disk to the main memory
assigning ready process to the CPU
None of these

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