Computer Knowledge

Operating Systems

1,344 Questions

Test your computer knowledge with these questions on operating systems. The content covers various platforms including Unix, Linux, Windows, Android, and Macintosh. These questions are commonly asked in the computer knowledge sections of banking and government exams.

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Operating Systems Questions

Multiple choice

System tray is available in which of the following?

  1. Desktop

  2. Start Menu

  3. Task Bar

  4. Control Panel

  5. My Computer
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The system tray is located on the right side of the Windows task bar. It is the collection of small icons on the opposite side of the Start Menu. The volume control and the date & time are default items in the system tray.

Multiple choice

Which of the following is not an OS?

  1. DOS

  2. Windows

  3. Linux

  4. UNIX

  5. C
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

C is not an operating system. C is a high-level programming language that was developed in the mid-1970s

Multiple choice

MS - DOS is a

  1. single user operating system

  2. multi user operating system

  3. multi tasking operating system

  4. None of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

MS-DOS (Microsoft Disk Operating System) is a single-user operating system designed for one user at a time. It lacks multi-user capabilities like user accounts, concurrent logins, or resource sharing between multiple users, which are features of multi-user OS like Unix or Windows NT.

Multiple choice

The extension of a Screen Saver file is ________.

  1. .SCS

  2. .SCR

  3. .SCP

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

.SCR is the standard file extension for Windows screen saver files. These are essentially executable files that run when the system is idle, with the .SCR extension identifying them as screen savers to the system.

Multiple choice

Consider the following code fragment: if (fork()==0 {a = a + 5; print f (%d,%/na, and a);} else {a − 5; print f (%d,%d/n,a,&a);} Let u, v be the values printed by the parent process, and x,y be the values printed by the child process. Which one of the following is TRUE?

  1. u = x + 10 and v = y
  2. u = x + 10 and v $\ne$ y

  3. u + 10= x and v = y
  4. u + 10 = x and v $\ne$ y
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Initial value of a is 10 and its address and the value of 'a' would be different for both the parent and child processes. So, (1) and (2) are incorrect. Also, parent process executes a = a − 5 = 5 = u and child executes a = a + 5 = 15 = x. Therefore, u + 10 = x.

Multiple choice

Consider two processes P1 and P2 accessing the shared variables X and Y protected by two binary semaphores Sx and Sy respectively, both initialized to 1. P and V denote the usual semaphore operators, where P decrements the semaphore value and V increments the semaphore value. The pseudo-codes of P1 and P2 are as follows:

In order to avoid deadlock, the correct operators at L1,L2,L3 and L4 are respectively

  1. P(SY),P(SX);P(SX),P(SY)

  2. P(SX),P(SY);P(SY),P(SX)

  3. P(SX),P(SX);P(SY),P(SY)

  4. P(SX),P(SY);P(SX),P(SY)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Here semaphores are required to obtain mutual exclusion since both access X & Y. So at L1 P (Sx) which means now S wait x = at L2 P (Sy) Sy wait, this prevents process P2 to start access X &Y. V(Sx) & V(Sy) in the end of P1 makes Sx & Sy signal so that at L3 & L4 P(Sx) & P(Sy) can start.