Question: 1) Why do we say operating systems are pure overhead of real work? 2) What are the four basic function modules of an operating system?

1) Why do we say operating systems are pure overhead of real work?

2) What are the four basic function modules of an operating system? (Hint: Device management is one of the modules.)

3) Differentiate between an abstract resource and a physical resource. Give two examples of each.

4) Briefly describe the difference between an interrupt and a trap.

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