Operating System (OS)
Addressing structure

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

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

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

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Operating System (OS)
All of the following are task performed by the operating system except

Provides an interface for user to interact with computer
Managing hardware on the computer
Performing housekeeping task like file compression and disk defragmentation
Controlling the access that application program has to the CPU

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