Operating System (OS)
Addressing modes

defines the fundamental method of determining effective operand addresses
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
All of these
None of these
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.

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Operating System (OS)
The term "operating system" means

a set of programs which controls computer working
conversion of high level language into machine code
the way a floppy disk drive operates
None of these
the way a computer operator works

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Operating System (OS)
Thrashing can be avoided if

the pages, belonging to the working set of the programs, are in main memory
the speed of CPU is increased
None of these
All of these
the speed of I/O processor is increased

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