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1.  
A laptop must keep the open documents safe even if its battery runs out completely, and use no power while closed. The best choice is:

Correct Answer: B [Hibernate]

Explanation:

Hibernate saves the open work to disk and powers off; sleep keeps it in RAM, which needs power.

2.  
Consider the following statements about File Explorer in Windows:
I. Dragging a file to a folder on the same drive moves it.
II. Dragging a file to a folder on a different drive moves it.
III. Cut followed by paste moves a file.
Which of the statements given above is/are correct?

Correct Answer: C [Only I and III]

Explanation:

I and III true; II false – dragging to a different drive copies the file.

3.  
Stretch – Four jobs arrive at time 0 in the order J1 (4 ms), J2 (9 ms), J3 (3 ms), J4 (6 ms). Under FCFS, the waiting time of J4 is:

Correct Answer: A [16]

Explanation:

J4 waits for 4 + 9 + 3 = 16 ms (Queue Sum).

4.  
Stretch – For the same four jobs, how much LESS is the average waiting time under SJF than under FCFS?

Correct Answer: D [2.5 ms]

Explanation:

FCFS 33/4 = 8.25 ms; SJF order 3, 4, 6, 9 → 0, 3, 7, 13 → 23/4 = 5.75 ms; difference 2.5 ms.

5.  
Stretch – For the FCFS schedule above, the average turnaround time is:

Correct Answer: C [13.75 ms]

Explanation:

Completion 4, 13, 16, 22 → total 55 → 55 ÷ 4 = 13.75 ms.

6.  
Consider the following statements about Windows:
I. Files deleted from a pen drive normally go to the Recycle Bin.
II. The Clipboard temporarily holds data that is cut or copied.
III. Task Manager can end a program that is not responding.
Which of the statements given above is/are correct?

Correct Answer: C [Only II and III]

Explanation:

I false – removable-drive deletions usually skip the Recycle Bin; II and III true.

7.  
Which of the following is firmware rather than part of the operating system?

Correct Answer: E [BIOS]

Explanation:

BIOS is start-up firmware stored in a chip.

8.  
Stretch – Which chmod value lets the owner read and write, the group only read, and others nothing?

Correct Answer: A [640]

Explanation:

rw- = 6, r-- = 4, --- = 0 → 640.

9.  
How many of the following are Linux commands? pwd, ls, chmod, NTFS, cd, FAT32

Correct Answer: C [4]

Explanation:

pwd, ls, chmod, cd = 4; NTFS and FAT32 are file systems.

10.  
Consider the following statements about deadlock:
I. Deadlock needs all four conditions – mutual exclusion, hold and wait, no pre-emption and circular wait – at the same time.
II. Breaking any one of the four conditions prevents deadlock.
III. Round-robin scheduling is one of the four conditions of deadlock.
Which of the statements given above is/are correct?

Correct Answer: B [Only I and II]

Explanation:

I and II true; III false – round robin is a scheduling method.

11.  
Stretch – Jobs A (4 ms), B (6 ms) and C (2 ms) arrive at time 0. Round robin with a quantum of 3 ms (order A, B, C). In which order do they finish?

Correct Answer: E [C, A, B]

Explanation:

A 0–3, B 3–6, C 6–8 (C done), A 8–9 (A done), B 9–12 → C, A, B.

12.  
Match the OS type with the situation:
List I: (a) Real-time; (b) Batch; (c) Time-sharing; (d) Distributed
List II: (1) many users at terminals share one CPU; (2) aircraft autopilot; (3) night-time printing of all statements; (4) many servers act as one system

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

Explanation:

Deadline – real-time; collected jobs – batch; time slices – time-sharing; many as one – distributed.

13.  
Consider the following statements about Linux:
I. Its kernel was first written by Linus Torvalds.
II. The superuser account is called root.
III. Paths in Linux use the back-slash, e.g. \home\ravi.
Which of the statements given above is/are correct?

Correct Answer: C [Only I and II]

Explanation:

I and II true; III false – Linux paths use forward slashes: /home/ravi.

14.  
Which pair is NOT correctly matched?

Correct Answer: D [exFAT – CD/DVD optical discs]

Explanation:

exFAT is for flash drives/memory cards; CDs/DVDs use ISO 9660/UDF.

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