🔥 Special LIVE Session For Operating System Exam 📚 | Study With Harshit | 28 May 2026 part 1

Added: 2026-05-30

[00:00:04]Hello students welcome to our live session.

[00:00:17]Let us wait for 5 minutes and Jana can also join. After that we will start the session.

[00:01:03]We have set a countdown of 5 minutes.

[00:01:05]So today's live session will be about your Operating System subject, its exam is tomorrow. So many comments were coming from BCA students that Sir, there should be a live session also.

[00:01:17]So that's why we have brought a live session for all of you.

[00:01:19]So we have kept a waiting time of 5 minutes and after this we will start today's live session. So students, let us tell you that all the units of Operating System subject have been uploaded on Study with Harshit YouTube channel. So if you have not seen it then you must watch it.

[00:02:02]I hope by now you must have seen the videos of all the four units which we have explained in detail for all of you and we have also shared the questions etc. on our channel Study with Harshit YouTube channel, so we keep taking live sessions from time to time and for those who are members of our channel, we are definitely going to start special live streaming now in which we will take weekly live sessions. Yes, if you have not joined the channel membership yet, then definitely join.

[00:02:44]Yes, Yash Choudhary's comment is that Sir, if I solve the important questions then I will pass. Yash ji, let us tell you that there are four units in your syllabus.

[00:02:55]So you should do all four units first.

[00:02:57]Every time we give priority that you first complete your syllabus and then go to the main questions. So first of all we would suggest that you focus on your four units of Operating System subject and then move towards open questions. The questions we have mentioned have been repeated in previous years.

[00:03:20]So that is important. Yes.

[00:03:22]But we would still say that you should first focus on all four units. Yes, join quickly and know. There are still 2 minutes left. Yes, yes, absolutely, if you have not studied yet, then what should I do, but sir, but I do not have that much time, how can I cover the entire syllabus, so you do one thing, our full syllabus video has also been uploaded. You can see it and we have explained a lot in detail in it and all your units will be completed in one video.

[00:04:20]So you can prefer that also.

[00:04:33]For those who are members of our channel, we are soon going to conduct a weekly live session and if you have not yet joined the channel membership, you can join.

[00:04:48]Exclusive videos and live sessions for channel members will be available soon for our channel members. Yes, it's only 50 seconds. So in today's live session, we will do a fast revision of all our four units of Operating System subject so that we can know how we have prepared for our exam. Yes students, let us also tell you that in this we are going to share with you the questions which we have told in our first video. So today's live session will be based on your questions and joint questions.

[00:05:40]So let us now start today's live session.

[00:05:43]So we will share that with you first. Yes.

[00:06:20]So students, we share it with you.

[00:06:24]Before that, please set it up here.

[00:06:30]If you have not liked this live session of ours yet, then like it so that you keep getting notifications of our live sessions and videos from time to time.

[00:06:43]First, let's set up the lights properly. Yes.

[00:07:02]So operating system is our subject.

[00:07:05]Operating system is our subject and first of all we are sharing the questions in it. The first question in the ent questions is Define Operating System Explain its function and services in detail. We have to tell what an operating system is and what are its functions and explain the functions and services.

[00:07:39]What is an operating system and what are its functions and services? I have to tell you this. The next question is explain different types of operating systems. As we have just told you, we also have units with us. Today's live session will cover all our units in a fast manner. If you are short on time, please stay connected with this session.

[00:08:06]We are going to cover all of this. So in this, the second question is that you may be asked to explain different types of operating systems. What types of operating systems are there? Like patch operating system, multi programming, time sharing, real time operating system or distributed operating system.

[00:08:30]Next question is Explain Structure and Architecture of Operating System with Diagram.

[00:08:38]We have to tell about the structure and architecture of operating system. What is this? The next question will be what are system calls? Explain their types and examples. We will get the answers to all these questions when we do a complete revision. The next question is Explain the Evaluation Generation of Operating System. You have to tell the generation of the operating system. I have to tell you all these things in detail. Our next question is Explain Process Management. You have to explain process management. Also, you will have to describe what is process state?

[00:09:22]What is a process control block? And what are state transitions? The next question we have prepared is what are threads? What are threads? Types of Threads, Benefits of Multi Threading, What is it?

[00:09:40]What is CPU scheduling? And what is FCFS, SF and Round Rowan inside it?

[00:09:47]Yes, we are sharing this question with all of you. The next question in this is our differentiation between primitive and non-primitive scheduling. I want to tell you what is the difference between primitive and non-primitive scheduling? Our next question will be to explain the performance criteria of scheduling algorithm. I want to tell you, explain what is the performance criteria of scheduling algorithm?

[00:10:22]Next is your Explain Critical Section Problem and Mutual Exclusion.

[00:10:30]Discuss solutions using semaphores and monitors.

[00:10:38]So students, all the questions that we are sharing are the ones that we have designed keeping in mind the questions asked in your previous year exams and according to your new syllabus.

[00:10:53]Look at the next question, that is our explain inter process communication.

[00:11:00]What is interpro communication and what is a race condition?

[00:11:05]Now comes the question related to dead lock.

[00:11:08]What is a dead lock? What is a dead lock? I have to tell you. What are those four necessary conditions? You also have to tell this so that dead lock occurs.

[00:11:19]What are deadlock prevention techniques and how can we avoid deadlock?

[00:11:24]Explain Banker's Algorithm with Examples. Next question is your explain deadlock detection and recovery technique. You must be aware of deadlock and if you don't know then stay connected in the live session. We will share everything with you till the end. The next question is our explain memory management.

[00:11:47]What is memory management?

[00:11:50]What is paging? What is segmentation in this? And what is fragmentation?

[00:11:55]As well as differentiate between logical and physical address. What is the difference between logical and physical address? You have to explain what is memory and demand paging? And the next question is to explain page replacement algorithm in which you have to explain FIFO LRU and optimal.

[00:12:21]So you saw that what we just shared with you were your important questions, about which we have already uploaded videos earlier.

[00:12:29]So your exam is tomorrow, that is why we have brought a special live session for all of you, that is why now we start our Unit One. The first topic that comes to us in Unit One is Operating System.

[00:12:53]What is an operating system?

[00:12:59]Yes students, please tell us once whether our sound is coming clearly? There is no issue with video streaming. Please do let us know by commenting once. All the students who are joining at this time, please inform us once. There was some technical issue, please tell me once.

[00:13:25]I hope everything is clear. The first unit is Unit One Operating System.

[00:13:32]What is an operating system? Operating system is our system software which acts as an interface i.e. as a medium between the user and the computer hardware. Operating system is our software which acts as interface. It acts as a mediator between the user and the hardware.

[00:13:53]This is the operating system.

[00:13:56]It manages system resources and provides services to programs.

[00:14:04]In this live session, we will cover the topics as quickly as possible. So now next comes our evaluation of program, what will be the operating system?

[00:14:14]What are the stages of evolution?

[00:14:17]Our Simple Batch System was introduced in the 1950s. In which the jobs were processed in batches. There was no direct interaction with the user.

[00:14:27]And the output was generated after complete execution. When the complete execution was done, our output was generated. Yes. And next is our programming system. The programming system used to load multiple programs in the memory at the same time and the CPU used to switch between the programs, which improved our CPU utilization.

[00:14:55]Next is our time sharing system. In this, our multiple users share the CPU time and each user gets a small time in which interactive computing is provided.

[00:15:13]What are real time systems? Real-time systems that provide immediate response are used in critical applications such as air traffic control or medical systems.

[00:15:24]In real time systems, immediate response is required. Therefore, real time system provides immediate response. For example, if there is air traffic control or medical systems, there is no delay in them.

[00:15:39]Modern Operating System User Friendly GUI Graphical User Interface. It supports multitasking, multi-user systems and networking.

[00:15:52]Our next question is what are the components of an operating system? Students, let us tell you that in this live session, we will complete all the topics in a fast and easy way.

[00:16:07]What are the components of our operating system? We have already told you. Process Management What does it consist of? Handles the creation, scheduling, and execution of the process.

[00:16:20]What does CPU scheduling consist of? Process synchronization occurs. And what is memory management?

[00:16:29]Main memory is managed in memory management.

[00:16:32]Memory is allocated to two programs.

[00:16:47]Allocates memory after use.

[00:16:50]When it is used, the memory is de-allocated. The memory that is there is not kept in use continuously.

[00:17:01]File system management. What does file system management consist of? In this, files and directories are organized and managed. File creation, deletion and access control are done. Device Management comes under the Device Management component.

[00:17:19]In this, hardware devices are controlled and device drivers are used to manage input/ output devices like keyboard and printer. Security and protection protects the system from unauthorized access by using user authentication and data protection.

[00:17:41]So students, this is your live session on operating system subjects, so do like the video of the live session.

[00:17:54]Input Output Management What does it consist of? Handles input/output operations.

[00:17:59]Performs communication between devices and system buffering and caching. The operating system is evaluated from a simple batch system. How far? Up to modern graphical user interfaces, which are based on systems and their consistent components. Like process management, memory management, file system, device management and security.

[00:18:28]What are services? of the operating system. The operating system provides many services that ensure smooth functioning of the system.

[00:18:40]We have already told you about those services and if you remember them, please do let us know in the comments. First comes program execution.

[00:18:51]Loading and running the program.

[00:18:55]Next comes input output operation.

[00:18:58]Managing input/output devices such as keyboard, printer, etc. File system manipulation to create, delete, or manage files. Manipulating files and directories is called file system manipulation. So this is our main operating system service. Next Communication.

[00:19:21]Communication enables communication between processes.

[00:19:26]Error detection. Detecting and handling system errors. Errors keep occurring in the system.

[00:19:33]So handling and detecting them is also the job of the operating system.

[00:19:39]Resource allocation allocates CPU, memory, and devices efficiently.

[00:19:47]Protection and security. It prevents unauthorized access and ensures data safety.

[00:19:56]Operating system structure defines how different components are organized, whether in a layered structure or a monolithic structure. What does a monolithic structure consist of? The entire operating system works as a single unit.

[00:20:22]All functions are combined and it is fast but less secure. Where our layered structure divides the operating system into layers and each layer performs a specific function, making it easier to design and debug. So you saw about layered structure and monolithic structure.

[00:20:52]What is micro kernel structure?

[00:20:55]In this, only the essential functions are present in the core and other services run separately. It is more secure and modular.

[00:21:06]What is our modular structure? The modular structure divides the operating system into independent modules.

[00:21:16]Our operating system is divided into independent modules which makes it easy to update and maintain. It combines the advantages of both monolithic and modular structure of microcontroller.

[00:21:37]What is the architecture? The types of architecture of our operating system include single user architecture, multi user architecture, client service server module and distributed architecture.

[00:21:53]Which is our single user architecture, it has one user at a time.

[00:22:01]And in this multi-user architecture, multiple users can interact simultaneously. And the client server model, these services are provided over the network.

[00:22:14]What happens in distributed architecture? Multiple systems work together. So you saw about types of architecture which is your Unit One topic.

[00:22:25]Now comes the next one, that is types of operating system. Major types are batch operating system, time sharing operating system, real time operating system, distributed operating system and network operating system and multi- progression running operating system. These are the six types of our operating system.

[00:23:22]What is Batch Operating System? We want to tell you about what our Batch Operating System is. See, batch operating system is a system where jobs are collected. System where jobs are collected and executed in batches in which jobs are executed in batches. The work is done in batches without any user interaction. So this is our batch operating system. Like the jobs, whatever work is there, it is submitted to the system. It will store it in a queue and then execute it one by one. Like payroll processing or bank transaction processing. In this way.

[00:24:13]Its advantage is that we get a high throw put. Less CPU is ideal and time efficient for large scale tasks. But its disadvantages are that there is no user interaction and it is difficult to debug and there is more waiting time for execution.

[00:24:34]Batch operating system which provides essential services. Like program execution and resource management. It follows different structures. As well as architecture, it includes types such as batch, time sharing, and real-time systems.

[00:24:57]Multi programming.

[00:24:59]What is multi programming? Multiprogramming is a technique where multiple programs are loaded into a single memory and the CPU is switched between them to improve utilization.

[00:25:14]CPU Utilization.

[00:25:17]So what is its concept? It is very simple.

[00:25:19]Where a person is waiting. The CPU is executing another process.

[00:25:25]One of our processes is waiting and the other one is getting executed.

[00:25:32]When our second one is executed, the third one will come after that second one. So in this way our CPU does not remain idle.

[00:25:41]Program A is waiting for input.

[00:25:43]CPU is starting execution program for B. The advantages of this method are that CPU utilization improves and throughput increases. Meaning more work will be done in less time. It involves complex memory management and requires efficient CPU scheduling. So these are its disadvantages.

[00:26:10]What are time sharing systems?

[00:26:12]What happens to students in the time sharing system? Let us tell you. In time sharing system, time sharing system is an extension of multi programming. Where the CP divides it into multiple users. Divided which is there and in what? Across multiple users and processes. Its concept is very simple.

[00:26:33]Each user and process gets a small time slice.

[00:26:39]Everyone gets equal amount of time. The CPU keeps switching between them all rapidly.

[00:26:44]This creates an illusion that it is not known whether the switches are happening one after the other or simultaneously. So this is our time sharing system. Like multiple users work on the same system at the same time.

[00:27:01]Its advantages are that it is an interactive system. Fast response is achieved but the disadvantages are high overhead due to frequent switching and security and data privacy issues.

[00:27:19]So what you've seen so far is all of Unit One is running. Now comes the second next topic in Unit One which is Paler System.

[00:27:29]What are these? Parallel system is our system where multiple processors execute the task simultaneously. The tasks are divided into smaller parts and each processor works on one part in a panel.

[00:27:49]Like there are multi call processors. The advantage of dual core and quad core CPUs is that they provide fast processing speed. There is an increase in system reliability and the disadvantage is that we have to design complex systems and require expensive hardware.

[00:28:16]Multi-programming improves CPU utilization. How to execute multiple programs by excluding time sharing and by allowing multiple users to share CPU time interactively and parallel systems that use multiple processors to perform tasks simultaneously.

[00:28:39]Now let us understand about distributed system.

[00:28:41]What is a distributed system? What are our distributed systems? Students, till now we have covered many topics of Unit One.

[00:28:53]If you missed it, you can rewind the live session a bit.

[00:29:02]Distributed systems are collections of independent computers that work together as a single unified system.

[00:29:13]Many computers work together as a single system.

[00:29:16]What is its concept? Each computer has its own CPU and memory, and the systems are connected through a network and communicate and coordinate to perform tasks. This is our distributed system. Like cloud computing systems, internet based services came into existence. Such as web applications or online platforms. The advantage of our distributed systems is that there is resource sharing.

[00:29:53]Our hardware and software resources can be shared across systems. There is high reliability and scalability too.

[00:30:00]What is reliability that fails of one system. If one system fails, the other system will continue to function.

[00:30:06]And scalability means that if you need to add more space or more systems to further improve performance, you can. The disadvantages are that there is dependency on the network and there are security issues because data transmission happens over the network, so it can cause issues.

[00:30:32]What is a real time system? A system that produces output with in fixed time constraints. Meaning it produces output within a fixed deadline.

[00:30:43]That is your real time system. There are two types of real time systems.

[00:30:49]Basically there is hard real time. Now what is hard real time and soft real time? There are two ways. The first type is hard real time system and the second type is soft real time system. Now we will first understand about hard real time system. Hard real time systems have strict deadlines which have to be met.

[00:31:11]No delay of any kind is allowed in this.

[00:31:15]If you fail to meet the deadline, it can lead to serious issues.

[00:31:23]Like air traffic control or medical monitoring systems.

[00:31:28]So there should not be any kind of delay in these.

[00:31:31]And soft real time systems are those where some delay is acceptable. Like video streaming or online gaming.

[00:31:44]In soft real time system, there is a little delay. That is allowed for you.

[00:31:59]These are the advantages. Immediate response is obtained from real time system. It has quick and predictable output and high reliability. But it is expensive to implement and its design is complex. So you should also take care of these things.

[00:32:14]Our distributed system consists of multiple computers working together over a network where our real- time system provides output within a strict timeline, which is used in time-critical applications.

[00:32:36]What is an operating system service? Operating system services are functions provided by the operating system to users and application programs to ensure efficient system operations.

[00:32:51]What is the main operating system service?

[00:32:56]Students, all the companion questions that we have shared with you right now are available in all your units, in all four units.

[00:33:05]So, you should keep watching these also.

[00:33:07]Now we have seen batch operating system, multi programming operating system, main operating system service.

[00:33:19]Program execution in the main operating system service.

[00:33:22]What happens in program execution?

[00:33:24]Programs are loaded into memory and executed. Input output operations are done.

[00:33:32]Input output devices such as keyboard, mouse and printer are managed in it. File system manipulations occur. Like operations are performed. Creation, deletion, reading and writing. So, in this live streaming of ours, we will provide you with fast revision.

[00:33:50]So if you want to revise more in detail then we have uploaded all the topics in a more deep manner on our channel Study with Harshad, unit wise and full syllabus is also available. You can do this for communication, for error detection, and for resource allocation.

[00:34:11]What are the time types? System calls are those of process control. Creating and terminating processes. File management is done. Opening, reading, writing files. What is Device Management?

[00:34:24]Access and control hardware devices.

[00:34:27]Information maintenance, updating, system information, all these come under your information maintenance. Communication Enabling inter-process communication.

[00:34:41]What is a system program? System programs are utility programs that provide a convenient environment for program development and execution, such as file management tools, editors, compilers, or command interpreters.

[00:35:03]Operating system structures include our monolithic structures. In this the entire operating system works like a single program. It has fast execution and is difficult to maintain.

[00:35:18]What does a layered structure consist of? The operating system is divided into multiple layers. It is easy to debug but the performance becomes slow.

[00:35:28]Microkernel Structure. What's in it?

[00:35:32]All the essential services are available in our kernel and it is more secure.

[00:35:37]Communication becomes overhead. In a modular structure, the operating system is divided into independent modules. It is flexible.

[00:35:46]Easy to update and maintainability is better.

[00:35:52]What are the generations of operating systems? The operating system has evolved over time, its efficiency, speed, user interaction, all these things have improved with time. As you might have noticed, the computers that came earlier were not so fast. But with time they improved, RAM developed, storage speed improved.

[00:36:18]So, all these things kept improving with time.

[00:36:20]As the size of your applications increases and requirements change, software and hardware also change accordingly.

[00:36:27]Our first generation was from 1940 to 1955. What were its characteristics in the first generation? This is no operating system. There was no operating system.

[00:36:41]Computers used to work in vacuum tubes using vacuum tubes.

[00:36:48]Programs were written in machine language.

[00:36:50]Now what is machine language? You must know it. Binary language zero and one. Programs had to be written in that only. The user interacted directly with the hardware and performed only one task at a time.

[00:37:04]It was very slow, had no user interaction and was difficult to operate. Now our second generation has come to remove all these things. From 1955 to 1966. The batch operating system introduced in this is used. It used transistor programs in your assembly language. What happened with this? Ideal time reduced and performance improved. Jobs were collected and processed in batches and there was no direct user interaction. There was no interaction and debugging was difficult in this also.

[00:37:47]After this came our third generation, from 1965 to 1980, multi-programming was introduced in it and time sharing system is used in it, integrated circuit which is called ICB, multiple programs run in it simultaneously, the user interacts with the system, the advantages are that we get better CPU utilization, in this we get fast processing and multi- user support. The limitations are that it has a complex design.

[00:38:26]What is our fourth generation? The fourth generation is from 1980 and present till now. Micropore is used in this.

[00:38:32]Microphones come in your latest and personal computers were developed. Graphical user interface was also used in it. Multitasking has enabled us to have networking, distributed systems and mobile operating systems like Windows, Linux, Mac OS or Android. It is user friendly, provides high performance and advanced features.

[00:39:03]Now let us know about the process. If you are still connected to our live session then please like it and tell us by commenting how is your preparation going?

[00:39:20]What is the process process? The process is our program in execution. A program stored on the hard disk is only a passive entity. When our program starts executing, it becomes our process. This is the process.

[00:39:42]Why is there a need for process management? When many of our programs run simultaneously. So there is a need to manage them also. So that's why process management was needed.

[00:39:55]After that CPU sharing is required. CPU sharing is also required. Resource allocation is required and multitasking must be controlled.

[00:40:06]Process States: What are they?

[00:40:11]What is our main process state? New State.

[00:40:15]In this, a process is created.

[00:40:18]In this we are providing you fast quick revision.

[00:40:22]So we will not go too deep into this so that you can type a revision.

[00:40:27]Next is your ready state.

[00:40:30]In this the process gets ready to execute and waits for CPU allocation. Process which is All Required Resources Except CPU. Like its features. It is stored in the red queue and waits for the scheduler decision.

[00:40:52]Memory is already allocated.

[00:40:56]After this comes our running state. In this the process is executed by CPU. It features CPU assigned instructions are executed and actual processes take place.

[00:41:11]Now comes your next topic which is fourth step waiting. What happens in this?

[00:41:18]Processes wait for input/output operations, for user input, for file access, and for network responses.