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1.  
Stretch – P1, P2, P3 arrive at time 0 with bursts 5, 3, 1 ms. Round robin with a time quantum of 2 ms is used (order P1, P2, P3). At what time does P1 finish?

Correct Answer: B [9]

Explanation:

Gantt: P1 0–2, P2 2–4, P3 4–5, P1 5–7, P2 7–8, P1 8–9 → P1 finishes at 9.

2.  
Stretch – For the same round-robin schedule, the average waiting time is:

Correct Answer: A [4.33 ms]

Explanation:

Completion 9, 8, 5; waiting = completion − burst = 4, 5, 4 → 13 ÷ 3 ≈ 4.33 ms.

3.  
Stretch – Reverse question: which chmod number gives rw-r-x--x?

Correct Answer: D [651]

Explanation:

rw- = 6, r-x = 5, --x = 1.

4.  
Consider the following statements about types of OS:
I. In multiprogramming, the CPU switches to another program when one waits for I/O.
II. A distributed OS makes many networked computers look like one system.
III. A batch OS lets users interact with a job while it runs.
Which of the statements given above is/are correct?

Correct Answer: C [Only I and II]

Explanation:

I and II true; III false – batch jobs run without interaction.

5.  
Match the term with its meaning:
List I: (a) Paging; (b) Segmentation; (c) Spooling; (d) Virtual memory
List II: (1) variable-size logical parts; (2) fixed-size pages in frames; (3) disk used as extra RAM; (4) queue for a slow device

Correct Answer: E [a-2, b-1, c-4, d-3]

Explanation:

Paging – fixed; segmentation – variable; spooling – printer queue; virtual memory – disk as RAM.

6.  
Stretch – Trick Spotter: four jobs with bursts 9, 2, 6, 4 ms are all ready at time 0. Which order gives the minimum average waiting time?

Correct Answer: B [2, 4, 6, 9]

Explanation:

Shortest First Wins – ascending order (SJF).

7.  
Spot My Mistake: "Deleting a shortcut icon from the desktop deletes the program it points to." What is wrong?

Correct Answer: B [A shortcut only points to the file; deleting it leaves the program untouched]

Explanation:

A shortcut is a pointer; the real file stays.

8.  
Odd one out:

Correct Answer: C [Round robin]

Explanation:

Round robin is a scheduling method; the other four are the conditions for deadlock.

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