Operating System (OS)
The Memory Address Register

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".
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.
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)
Memory management is :

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

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Operating System (OS)
Which, of the following, is true for testing and debugging?

Testing checks for logical errors in the programs, while debugging is a process of correcting those errors in the program
Testing and debugging indicate the same thing
All of these
None of these
Testing detects the syntax errors in the program while debugging corrects those errors in the program

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