Operating System (OS)
Memory management is :

critical for even the simplest operating systems
not used on multiprogramming systems
replaced with virtual memory on current systems
None of these
not used in modern operating system

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Operating System (OS)
The Register - to - Register (RR) instructions

have both their operands in the main store.
All of these
None of these
which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, except in the case of store operation when it is also
which perform 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)
Paging

is a method of allocating processor time.
consists of those addresses that may be generated by a processor during execution of a computation.
allows multiple programs to reside in separate areas of core at the time.
None of these
is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.

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