Top 250 Operating Systems Interview Questions and Answers

Paging is a memory management technique used by OS to store and retrieve data from secondary storage.

• It divides the memory into fixed-size pages and stores data in these pages.

• It allows efficient use of memory by swapping out less frequently used pag...read more

The system typically restarts multiple times during an OS installation process.

• System may restart multiple times to complete different stages of the installation process

• Restarting allows for necessary updates and configurations to take effect

• Examples...read more

Patch management in Linux involves updating software to fix vulnerabilities and improve performance.

• Regularly check for updates using package managers like APT or YUM.

• Example: Use 'sudo apt update' and 'sudo apt upgrade' for Debian-based systems.

• Auto...read more

The outlook file responsible for taking backup is the PST file.

• PST file stores emails, contacts, calendar events, and other data in Outlook.

• Users can manually backup their PST file by exporting it from Outlook.

• Third-party backup software can also be ...read more

To rollback patches through Yum, use the yum history command and the yum history undo command.

• Use the 'yum history' command to view the history of installed packages and patches.

• Identify the transaction ID of the patch you want to rollback.

• Use the 'y...read more

A system call is a request made by a program to the operating system for a service or resource.

• A program executes a system call instruction.

• The CPU switches to kernel mode and transfers control to the operating system.

• The operating system performs th...read more

Echo command is used to print the input or output text on the terminal.

• Echo command is a built-in command in Linux/Unix systems.

• It is used to display a line of text/string that is passed as an argument.

• It can also be used to redirect the output of a ...read more

Tar utility is used to create backups by compressing files and directories.

• To create a backup using tar, use the 'tar' command followed by the appropriate options and arguments.

• Specify the files or directories to be included in the backup.

• Use the '-c...read more

Operating systems differ in their user interface, functionality, and compatibility with hardware and software.

• Windows is the most widely used OS, known for its user-friendly interface and compatibility with most software.

• MacOS is known for its sleek ...read more

Schedule refers to the classification of drugs based on their potential for abuse and medical use.

• Schedule I drugs have a high potential for abuse and no accepted medical use, such as heroin and LSD.

• Schedule II drugs have a high potential for abuse b...read more

The basic requirements for a Windows 10 operating system include a compatible processor, sufficient memory, and available storage space.

• Processor: 1 GHz or faster processor or SoC

• Memory: 1 GB for 32-bit or 2 GB for 64-bit

• Storage: 16 GB for 32-bit OS ...read more

Windows 7 is a newer version of Windows than XP, with improved features and security.

• Windows 7 has a more user-friendly interface

• Windows 7 has better security features, such as BitLocker encryption

• Windows 7 supports newer hardware and software

• Windows...read more

BIOS stands for Basic Input/Output System.

• BIOS is a firmware that initializes hardware during the boot process.

• It provides a low-level interface between the hardware and the operating system.

• BIOS settings can be accessed and modified through a setup ...read more

Semaphore and mutex are synchronization mechanisms used in multi-threaded environments.

• Semaphore allows multiple threads to access a shared resource simultaneously, while mutex allows only one thread at a time.

• Semaphore is used to control access to a...read more

An operating system is a software that manages computer hardware and provides services for computer programs.

• An operating system is the most important software that runs on a computer.

• It manages the computer hardware and provides common services for ...read more

To change permissions for a file, you can use the chmod command in the terminal.

• Use the chmod command followed by the permission code and the file name

• Permission codes include 'u' for user, 'g' for group, and 'o' for others, along with 'r' for read, ...read more

MK (Marketing) has various processes depending on the company and industry.

• MK processes can include market research, product development, advertising, sales, and customer service.

• The number of processes can vary depending on the company and industry....read more

Virtualization is the creation of a virtual version of something, such as an operating system, server, storage device, or network resource.

• Virtualization allows multiple operating systems or applications to run on a single physical machine, increasin...read more

RTOS is designed for real-time applications with predictable response time, while normal OS is designed for general-purpose computing.

• RTOS provides deterministic scheduling and prioritization of tasks.

• Normal OS may have non-deterministic scheduling a...read more

Zombie is a terminated process that still has an entry in the process table, while orphan is a child process whose parent has terminated.

• Zombie process is waiting for its parent to read its exit status

• Orphan process is adopted by init process (PID 1)...read more

When files are deleted in Linux, they are not immediately removed from the disk but rather marked as available for reuse.

• Deleting a file in Linux removes its entry from the file system's directory structure.

• The file's data blocks are not immediately ...read more

Synchronization in OS refers to the coordination of multiple processes or threads to ensure data consistency and avoid conflicts.

• Synchronization is necessary when multiple processes or threads access shared resources.

• It involves the use of synchroniz...read more

Increasing virtual RAM can improve computer performance. Here's how to do it.

• Open the System Properties window

• Click on the Advanced tab

• Under Performance, click on Settings

• Click on the Advanced tab

• Under Virtual Memory, click on Change

• Select the drive ...read more

Deadlocks are situations where two or more processes are unable to proceed because each is waiting for the other to release a resource.

• Deadlocks occur when multiple processes are stuck in a circular waiting state.

• Prevention techniques include resourc...read more

No, there is no ideal CPU scheduling possible.

• CPU scheduling is a complex problem with many variables.

• Different scheduling algorithms are suited for different scenarios.

• The ideal scheduling algorithm would depend on the specific system and workload.

• F...read more

Zombie process is a terminated process that has completed execution but still has an entry in the process table. Orphan process is a process whose parent process has terminated.

• Zombie process is created when a child process completes execution but it...read more

The standard code of pipe refers to the set of regulations and specifications that govern the design, construction, and use of pipes in various industries.

• The standard code of pipe varies depending on the industry and the type of pipe being used.

• For ...read more