There are 5 sub-questions in this topic, each sub-question has 8 points, totaling 40 points.

1.What are the main purposes of an operating system?

2. Which states do the process have? Draw a process state diagram.

3. Explain the difference between preemptive and non-preemptive scheduling.

4. Name two differences between logical and physical addresses.

5. Explain the purpose of the open() and close() operations