OS Module 1 Important 3-Mark Questions | Exam Quick Revision | Last Minute Revision

Added: 2026-05-13

[00:00:05]question.

[00:00:13]What is an operating system?

[00:00:16]Define an operating system and its primary goals. Operating systemware systemmed operating system. An operating system is a software that acts as an immediate intermediary between a computer user and the computer hardware. The primary goals us make the computer system convenient to use and use the computer hardware in an efficient manner.

[00:00:59]differentiate between monolithic and microlith micro kernel architecture monolithic micro kernel Essential services relation user Question briefly explain the system boots by computer CPU in BIOS.

[00:02:25]Power on self test. Power system.

[00:02:43]Control system user interface system initializes and run the BIOS. The BIOS perform power on self test and locate the boot loader in the system desk. The bootloader loads the kernel into the system memory and transfers the control to it which then initializes system services and the user interface.

[00:03:19]Second process concept and application process interfaces explain the five state process model.

[00:03:27]Important questioncess can be in one of these process instructions waiting program.

[00:04:12]Fifth question, what is a process control block and what does it hold? PCP control PC essential information process state program counter CPU registers CPUuling information memory management information and input output status information PCB data structure processor describe the mechanism of context switching. Context switching it is the process of storing the state of a current process so it can be resumed later.

[00:05:12]Forec resumed later and loading the saved state for a new process. This allows multiple processes to share a single CPU. It is an overhead because the system does no useful work while switching single CPU multiple processes and concurrency.

[00:06:00]Seventh question, distinguish between a process and a threadcy.

[00:06:17]Lightweight unit of execution execution.

[00:06:25]Lightweight unit of execution.cess question. What are the benefits of multi- threading?

[00:06:47]The responsiveness allowing a program to continue running even if a part of it is blocked.

[00:06:53]Browser download resource sharing sharing memory or resources of the processes.

[00:07:21]economy scalability utilizing multiprocessor architectures effectively multipprocessor architecture effective utilizing explain the many to one multi- threading model many to one User level management system execution multiore system execution Fore process scheduleuling.

[00:08:44]Explain the basic idea of round robbing.

[00:08:48]Rounding timecess is designed for time sharing systems.

[00:09:14]Each process is assigned a small unit of CPU time called a time quantum. The CPU should scheduleuler goes around the ready queue allocating the CPU to each process for an interval up to one time.

[00:09:28]If a process exceeds this, it is preempted and put back in the queue.

[00:09:39]How does a multi-level feedback work?

[00:09:44]feedback.

[00:09:46]Different prile priorities multiple process moves between cues based on their behavior.

[00:10:03]behavior.

[00:10:06]Too much CPU for priority.

[00:10:34]Too much CPUity.

[00:10:39]Okay.