Computer Science Interview Questions with Answers 2023

There is a lot of competition in the computer science field and finding a job is sometimes a bit challenging. Recruiters always want to hire candidates who have a good grasp of the subject and ready to work in tough market competition. Every computer science interview is different and the scope of the job is also different. We have prepared common computer science interview questions which can help you to crack your job interview and have a better idea of what kind of questions is asked in a computer science interview.

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How to prepare for a Computer Science Interview?

Introduce yourself

One of the first questions asked in almost every interview is “Tell me About Yourself”, so prepare 30 seconds or 1-minute answers which will be the first impression on your interviewer.

Study Computer Science Fundamentals

Go through all the important topics related to computer science like data structure, trees, searching algorithm, sorting also, programming, networking, operating systems.

Favorite programming language

Almost in every interview computer science interview, you will get a question about which programming language you like? So before the interview, have a stronghold of one programming language which you are interested in.

Code Challenges

Try solving 2-3 coding challenges per day, so you don’t have to cram everything.

Prepare Projects

During the interview share some knowledge about the projects you did and what you have learned and gained experience during that project.

Go for mock computer science interview questions

Either read some books which share the list of possible interview questions or we have prepared you the list of computer science interview questions which will give you an idea of what interviewers ask and how to respond to them.

computer science interview questions

Computer Science Interview Questions 2022

What is a computer system?

It is a system that is a combination of working hardware(CPU, Memory, and peripheral devices) and software(OS).

What is BIOS?

It is a computer program that performs the start-up and has two main procedures loading the operating system and determining what peripheral devices(Mouse, Keyboard) are connected.

What is Microprocessor? Share some names of microprocessors?

A microprocessor is the most important part of a computer without it the computer will not function, it is a programmable device that takes inputs and performs logical, arithmetic operations to produce the desired output. Example Inter Core i7, AMD Ryzen, AMD Athlon, Intel Pentium 4.

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What is a chipset?

A chipset is a collection of integrated circuits that control the flow of data between the processor, primary memory, and secondary memory.

What is an Operating system? Share some popular operating systems.

An operating system is software that communicates with the hardware and allows you to all sets of operations and you can run programs, applications on it which can take input and provide you the desired output. Microsoft, iOS, Unix, Ubuntu are some popular operating systems.

What is a programming language?

It is a language that computers can understand and it allows us to give instructions, there are many programming languages like C, C++, Java, JavaScript.

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What is an Algorithm?

The algorithm is a procedure for solving problems with a sequence of actions. It is usually written in “If”, “then”, “Else” for example self-driving cars have an algorithm to navigate through streets then if the direction says turn left then turn left to reach the destination.

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What is a file?

A file is an object that stores information, data, and configurations which command the computer program. It is always stored with the file name and separated by. (DOT) as an extension of a file.

What is SDLC?

SDLC in full known as software development life cycle is a methodology that defines the process for creating software.  There are various phases in SDLC

  1. Requirement gathering
  2. Planning
  3. Software Architecture Design
  4. Software development
  5. Testing
  6. Deployment

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What is a framework?

Frameworks or software framework is a platform that helps you to develop the application and in these frameworks, a low level of functionality is already developed which you can reuse while building your application and focus on the high-level design. Example .NET framework for windows, Android Framework for Android.

What is Compiler?

Complier is software that translates the source code to machine language which is then understood by the CPU.

What is Bug?

An error, fault, or flaw in a computer program or hardware which causes unexpected results is known as a bug or in simple language, any output produce by the program for which it was not designed is known as a bug.

What is Debugger?

A debugger is a computer program that helps the programmers to identify the bug in the code or the faulty behavior of the code. It basically pinpoints the error.

What is inheritance?

Inheritance is a mechanism that allows classes to inherit behavior and properties from other classes. In Java syntax is

Class SUV extends Car



We use inheritance for code reusability and method overriding.

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What do you mean by Cloud Storage?

Cloud storage is a model for data storage, a remote platform that provides multi-tenant infrastructure and stores your data on multiple servers which are managed by the hosting company. Earlier companies have to maintain servers physically and add storage when required now it can be expanded with just one click. Hosting company secures your data and maintains the servers and associated infra with that ensures to provide access to data when needed and wherever needed across the world.

What do you mean by Data Security?

It is a practice followed by every IT organization to secure their data from unauthorized access, corruption, theft in the cloud, or their own data centers. Companies now have a huge chunk of data on customers or any data which helps them to function the business.

Types of Data Security.


Data Erasure

Data Masking

Data Resiliency

What is API?

API is the short form of Application Programming Interface is software that allows two applications to talk with each and other and share operations and data. For example, every time you check the weather on your phone and refresh it at that point time the application sends an API request and the server provides you a response back which then translates as a weather forecast.

What is a class?

A class is a blueprint of creating objects and contains methods, variables, and what objects will contain and behave.

What is an Instance?

It is an object described by its class.

What is bandwidth?

Bandwidth is the volume of data/ information sent over a connection in a measured amount of time. Computers, data centers, servers, routers, repeaters, satellites are connected with each other to transmit digital information.

What is LAN?

LAN is a local area network in which devices are connected to each other in the same physical location example office or home.

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What is the internet?

The internet is a worldwide network of computers that contains information, such as text and images.

What is the World Wide Web (WWW)?

The World Wide Web is a network of interlinked HTML pages that can be accessed over the internet.

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How does the internet work?

When you type an address into your browser window (e.g., Google), it is sent to a DNS server that translates the address into an IP address. The IP address is then used by the web browser to find and load the requested website.

How do you use a search engine?

A search engine is a website that allows you to enter keywords or phrases and then displays a list of websites that match your query.

What are some common search engines?

Some common search engines include Google, Yahoo, Bing, and AOL.

What are some common internet protocols?

Some common internet protocols include TCP/IP, UDP, SMTP, POP, and IMAP.

What is a graphics processing unit (GPU)?

A graphics processing unit (GPU) is a specialized electronic circuit designed to rapidly manipulate and alter memory to accelerate the creation of images in a frame buffer intended for output to a display.

What is artificial intelligence?

Artificial intelligence is a branch of computer science that researches building machines that can do tasks that require human intelligence like decision making, identifying things, resolving problems and understanding the language, and responding.

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What is machine learning?

Machine learning is the branch of artificial intelligence that focuses on data analysis and data modeling in which systems learn the data, user behavior and identify patterns to make decisions without human intervention.

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What is deep learning?

Deep learning is the subfield of machine learning which works in processing data and creating patterns to use in decision making. It is also known as deep neural learning which is also capable of learning unsupervised from data that is unstructured.

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What is cryptography?

Cryptography is a process of secure communication and converting data into unintelligible text and vice versa so it can only be read by those who have access to it or sender and receiver. It is a term derived from the Greek word Kryptos.

STAR technique Computer Science Interview Questions

Tell me about the most important contribution you made to your team when completing a project.

Tell me about the most difficult problem you solved when writing software code

Tell me about the project you enjoyed the most, and what made it enjoyable.

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