Operating System (OS)
Addressing modes

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

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Operating System (OS)
A real time operating system is most likely to be used for which of the following task?

Ensuring that system clock works correctly on server
Controlling the fuel injection system of an automobile engines
Managing the access to system files in a laptop computers
Controlling access to a shared printer in a network

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