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1.  
Which OS function decides which ready process gets the CPU next?

Correct Answer: A [Process management]

Explanation:

Scheduling is part of process management.

2.  
An OS in which jobs are collected and run one after another without user interaction is:

Correct Answer: E [Batch]

Explanation:

No interaction + collected jobs = batch.

3.  
In a system with two or more CPUs working together in one computer, the OS is called:

Correct Answer: C [Multiprocessing]

Explanation:

Many CPUs = multiprocessing; many programs in memory = multiprogramming.

4.  
Stretch – chmod 754 gives the permissions:

Correct Answer: D [rwxr-xr--]

Explanation:

7 = rwx, 5 = r-x, 4 = r--.

5.  
Stretch – P1, P2, P3 arrive at time 0 with bursts 7, 2 and 5 ms and are served FCFS in that order. The average waiting time is:

Correct Answer: B [5.33 ms]

Explanation:

Waiting 0, 7, 9 → 16 ÷ 3 ≈ 5.33 ms.

6.  
Stretch – The same three jobs (7, 2, 5 ms, all at time 0) are scheduled SJF. The average waiting time is:

Correct Answer: B [3.00 ms]

Explanation:

Order 2, 5, 7 → waiting 0, 2, 7 → 9 ÷ 3 = 3 ms.

7.  
Which scheduling algorithm gives each process a fixed time quantum in turn?

Correct Answer: C [Round robin]

Explanation:

Round robin rotates a fixed quantum.

8.  
Match the Linux command with its job:
List I: (a) ls; (b) cd; (c) rm; (d) man
List II: (1) removes files; (2) changes directory; (3) lists files; (4) shows the manual page

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

Explanation:

ls – list; cd – change directory; rm – remove; man – manual.

9.  
Which character is NOT allowed in a Windows file name?

Correct Answer: E [?]

Explanation:

\ / : * ? " < > | cannot be used; ?, not the others.

10.  
A situation in which processes wait for each other for ever is called:

Correct Answer: A [Deadlock]

Explanation:

That is deadlock.

11.  
When a system spends more time swapping pages than doing useful work, it is called:

Correct Answer: B [Thrashing]

Explanation:

Excessive paging = thrashing.

12.  
Which mobile OS is developed by Google and based on the Linux kernel?

Correct Answer: E [Android]

Explanation:

Android is Google's Linux-based mobile OS.

13.  
Which key combination deletes a file permanently without sending it to the Recycle Bin?

Correct Answer: A [Shift + Delete]

Explanation:

Shift + Delete bypasses the Recycle Bin.

14.  
Which is the correct booting order?

Correct Answer: D [POST → boot loader → kernel → login screen]

Explanation:

Firmware runs POST, then the boot loader loads the kernel, then login.

15.  
Consider the following statements:
I. The shell is the core of the OS that stays in memory.
II. BIOS and UEFI are types of firmware.
III. A cold boot starts the computer from the power-off state.
Which of the statements given above is/are correct?

Correct Answer: D [Only II and III]

Explanation:

I false – that is the kernel; II and III true.

16.  
In operating systems, SPOOL stands for:

Correct Answer: C [Simultaneous Peripheral Operations On-Line]

Explanation:

SPOOL = Simultaneous Peripheral Operations On-Line.

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