os interview questions: 5 Operating System (OS) Interview Questions (With Answers)



We’re hiring a new programmer and it’s your job to test them. Can you think of some interesting questions that would give us insight into their abilities as a developer? Here are five OS/System programming interview questions and answers.

How do you find the longest line in a text file?

The best way to find the longest line in a text file is by using a stack, queue or hash table.

A stack is an ordered list where operations are performed on the topmost element (called a “top”). It allows only one operation at a time but it has no limit on how many elements can be added to it or removed from it. For example, if you want to add an element onto your stack and it already has four items there then you have no choice but to remove another item from somewhere else in order for room for your new addition.

A queue is another type of collection that has first-in first-out order (FIFO). This means that when adding something new into this type of collection, all previous items will move down towards its end until they reach their proper position again at which point all future additions will begin filling up space near where they originally were placed within said queue’s structure so long as nothing else happens between now and then like removing one piece without replacing them with another one right away instead; otherwise everything gets messed up!

Can you write a program that can tell whether a given number is divisible by 3 or not?

The following code can be used to check if a given number is divisible by 3 or not:

def divisible_by_3(num):

while num > 0:

if num % 3 == 0:

return True

What do you know about memory management?

Memory management is the process of allocating and deallocating memory in a computer system. It’s also important for performance, because if you don’t have enough memory available, your computer will slow down. There are several ways to manage memory:

  • Manual – Memory can be managed manually by using malloc() and free(). This is often done at compile time when you’re writing code yourself; however, it can also be done at run time if you’re doing it with C++ or another high-level language such as Java or Python (whereas lower-level languages like Assembly do not allow this).
  • Automatic – An operating system provides its own automatic allocation system that allocates memory as needed without any action on your part (but still freeing up unused blocks). This type of management happens both at compile time and run time depending on whether or not it’s done by the operating system itself or some other component within its environment (like an application framework).

Is there any difference between 4GB and 4GB-1GB?

The difference between 4GB and 4GB-1GB is 1 GB. The same applies to any other combination of numbers. For example, if you have 7 GB of RAM, then:

  • 4GB = 3 GB (4 x 1024 MB)
  • 5GB = 4 GB (5 x 1024 MB)

You have two functions defined as follows, with some numbers passed to each:

You have two functions defined as follows, with some numbers passed to each:

  • The first function is called divide_by_3, and it takes a number, divides it by 3 and returns the result.
  • The second function is called multiply_by_6, and it takes a number, multiplies it by 6, and returns the result.


  • How to find the longest line in a text file?
  • What do you know about memory management?
  • Is there any difference between 4GB and 4GB-1GB?


There you have it, five OS interview questions with answers. I hope this article has helped you prepare for your next interview! If you have any questions, feel free to reach out in the comments below.

Answer ( 1 )


    os interview questions: 5 Operating System (OS) Interview Questions (With Answers)

    Welcome to our blog post on Operating System (OS) interview questions! If you’re preparing for a job interview in the field of IT, it’s crucial that you have a solid understanding of operating systems. After all, OS is the backbone of every computer and device we use today. In this post, we’ll cover five common OS interview questions that will test your knowledge and skills in this area. So grab a cup of coffee and let’s dive in!

    What is an Operating System (OS)?

    An Operating System (OS) is a software that manages computer hardware and software resources. It acts as an intermediary between the user and the computer hardware, providing an environment for running application programs.

    One of the key functions of an OS is to manage system resources such as memory, CPU processing cycles, input/output operations, and storage devices. This allows multiple applications to run simultaneously on a single computer without interfering with each other.

    Another important function of an OS is to provide a graphical user interface (GUI) that allows users to interact with their computer through icons, menus, and windows. The GUI makes it easier for users to perform tasks such as opening files or launching applications.

    There are many types of operating systems available today including Windows, macOS, Linux/Unix systems among others. Each one has its own unique features but they all share the same basic functionality: managing resources on your device so you can get things done efficiently!

    What are the different types of Operating Systems?

    There are several types of operating systems, each with its own unique features and functionalities. These include real-time operating systems, single-user/multi-tasking operating systems, multi-user operating systems, distributed operating systems and embedded operating systems.

    Real-time Operating Systems (RTOS) are designed to quickly process data in real-time applications such as aerospace or medical equipment. Single-User/Multi-Tasking Operating Systems allow one user to perform multiple tasks simultaneously on a computer. Multi-User Operating Systems enable multiple users to access the same system concurrently while maintaining their privacy and security.

    Distributed Operating Systems provide a network of computers that work together as a cohesive unit to facilitate resource sharing among them. Embedded Operating Systems power small devices like smartphones, smartwatches or even cars.

    Each type has its own advantages and disadvantages depending on the intended use case scenario. It’s crucial for developers to understand which type is most suitable for their project so they can optimize performance and enhance user experience accordingly.

    What is the most popular Operating System?

    When it comes to the most popular operating system, there’s no doubt that Microsoft Windows takes the cake. With a market share of over 75%, Windows dominates the desktop and laptop computer market.

    One reason for its popularity is its user-friendly interface. The graphical user interface (GUI) makes it easy for users to navigate through their files and programs without needing extensive technical knowledge. Additionally, Windows has been around since the mid-80s, giving it an established reputation and familiarity among users.

    Another factor contributing to its success is compatibility with a wide range of hardware and software. Most third-party software providers prioritize development for Windows over other operating systems due to its dominance in the market.

    While there are certainly other options available such as macOS or Linux-based systems, they have much smaller market shares compared to Microsoft Windows. Ultimately, personal preference and specific needs should determine which operating system one chooses to use on their device.

    What are the benefits of using an Operating System?

    Using an Operating System (OS) has numerous benefits that make it an essential part of modern computing. One of the primary advantages is that it acts as a bridge between computer hardware and software. The OS manages system resources such as memory, CPU, and storage to ensure smooth functioning.

    Another benefit is that the OS provides security features like firewalls, antivirus software, and user authentication protocols to protect data from malware attacks or unauthorized access. Moreover, an OS enables device drivers to communicate with peripherals like printers, scanners, monitors etc., which allows users to perform various tasks efficiently.

    One significant advantage of using an OS is its ability to multitask seamlessly. It can run multiple applications simultaneously while allocating system resources intelligently without crashing or slowing down other programs.

    Updated operating systems come with new features making them more efficient than their predecessors. New updates also fix bugs and improve performance ensuring a better user experience for everyone who uses them.

    There are many benefits of using an operating system; from facilitating communication between hardware and software components to providing security measures against malicious threats along with increased efficiency in managing several applications at once.

    How can I improve my Operating System skills?

    Having a good understanding of Operating Systems is essential for any IT professional. Whether you’re just starting your career or looking to improve your skills, it’s important to stay up-to-date with the latest trends and developments in the field.

    To improve your Operating System skills, there are several things you can do. First, consider taking online courses or attending training sessions to learn about the different types of Operating Systems and their features. You can also practice by setting up virtual machines on your computer and experimenting with different OS configurations.

    Another great way to improve your skills is by participating in forums and online communities focused on Operating Systems. This will give you an opportunity to interact with other professionals who are passionate about this topic and share ideas and best practices.

    Don’t be afraid to experiment! The more hands-on experience you have working with different operating systems, the better equipped you’ll be when it comes time for that next job interview or project assignment.

    By following these tips, you’ll be well on your way to becoming an expert in Operating Systems – a skillset that will serve you well throughout your entire IT career!

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