Chapter 8. Databases

Question 1

What is an operating system (OS)?

Answer 1

• Software that manages hardware resources and provides services for computer programs.
• Acts as an intermediary between users and the computer hardware.

Question 2

What are the main functions of an operating system?

Answer 2

• Process management: Handles the execution of processes.
• Memory management: Manages system memory allocation.
• File system management: Controls the reading and writing of data to storage devices.

Question 3

What are examples of popular operating systems?

Answer 3

• Windows, macOS, Linux, Android, iOS.

Question 4

What is a process in the context of operating systems?

Answer 4

• An instance of a program that is being executed.
• Includes the program code and its current activity.

Question 5

What is multitasking in operating systems?

Answer 5

• The ability of the OS to execute multiple processes concurrently.
• Increases the efficiency of the CPU by scheduling tasks.

Question 6

What is the role of the kernel in an operating system?

Answer 6

• The core component of the OS that manages system resources and communication between hardware and software.
• Provides basic services such as memory management and process scheduling.

Question 7

What are the differences between a monolithic kernel and a microkernel?

Answer 7

• Monolithic kernel: All OS services run in kernel space, leading to better performance.
• Microkernel: Only essential services run in kernel space, improving modularity and stability.

Question 8

What is the purpose of device drivers?

Answer 8

• Software that allows the operating system to communicate with hardware devices.
• Translates OS commands into device-specific instructions.

Question 9

What is a user interface in the context of operating systems?

Answer 9

• The means by which users interact with the computer system.
• Types: Command-line interface (CLI), Graphical user interface (GUI).

Question 10

What is virtual memory in an operating system?

Answer 10

• A memory management technique that uses a portion of the hard drive as if it were RAM.
• Allows for larger applications to run on systems with limited physical memory.

Question 11

What is the purpose of the file system in an OS?

Answer 11

• Organizes and manages data storage on a device.
• Provides a way to store, retrieve, and update data.

Question 12

What are common file systems used in operating systems?

Answer 12

• NTFS (Windows), HFS+ (macOS), ext4 (Linux), FAT32 (various).

Question 13

What is process scheduling in an operating system?

Answer 13

• The method by which the OS decides the order in which processes are executed.
• Aims to maximize CPU efficiency and ensure fairness among processes.

Question 14

What is the difference between preemptive and non-preemptive scheduling?

Answer 14

• Preemptive scheduling: The OS can interrupt and switch between processes.
• Non-preemptive scheduling: Once a process starts, it runs to completion without interruption.

Question 15

What is a deadlock in operating systems?

Answer 15

• A situation where two or more processes are unable to proceed because each is waiting for the other to release resources.
• Can cause the system to become unresponsive.

Question 16

What are the types of user accounts in operating systems?

Answer 16

• Administrator (or root) account: Full control over the system.
• Standard user account: Limited permissions to ensure system security.

Question 17

What is the purpose of an interrupt in an operating system?

Answer 17

• A signal that informs the OS of an event that needs immediate attention.
• Allows the OS to respond to events like hardware malfunctions or user inputs.

Question 18

What are the differences between system software and application software?

Answer 18

• System software: Includes the OS and utility programs that manage computer resources.
• Application software: Programs designed to perform specific tasks for users.

Question 19

What is a real-time operating system (RTOS)?

Answer 19

• An OS designed to process data as it comes in, typically used in embedded systems.
• Ensures timely and predictable responses to events.

Question 20

What are the advantages of open-source operating systems?

Answer 20

• Free to use and modify.
• Supported by a community of developers.
• Offers transparency and flexibility for customization.