Operating System (OS)
Memory management is :

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

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

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.
All of these
None of these
have both their operands in the main store.

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Operating System (OS)
What hole will allocates in "Worst-Fit" algorithm of memory management?

It allocates the largest hole from the available memory holes
It allocates the smaller hole than required memory hole
It allocates the smallest hole from the available memory holes
It allocates the exact same size memory hole

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