Operating System (OS)
Non-modifiable procedures are called

concurrent procedures
topdown procedures
None of these
reentrant procedures
serially usable procedures

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Operating System (OS)
Memory management is :

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

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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
Controlling the access that application program has to the CPU
Performing housekeeping task like file compression and disk defragmentation
Managing hardware on the computer

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