Top 25 IT Interview Questions With Answers

The best of a IT job interview is that the technical questions are not very unpredictable. If you opt for a specific CS/IT job, you must have sufficient knowledge in this area as well as the basics of IT. With that in mind, I’ll list the 25 most common and most important interview questions every IT student should know.

These questions are usually asked during the interview of developers, help desk, server administrators, teachers/tutors, database administrators and testers, etc.

25 Computer Science Interview Questions With Answers

1. What is the definition of a computer system?

A computer system is a combination of CPU, memory and related electronics, all connected peripherals and the operating system.

2. What are the basic components of a computer system?

The basic components of a computer system are the central processing unit (arithmetic logic unit and control unit), memory (primary memory and secondary memory), and input and output devices.

3. What is a microprocessor?

A microprocessor is an integrated circuit that contains all the functions of the central processing unit of a computer.

4. Name some of the latest computer processors?

Intel Core i9, Intel Core i7, Intel Core i5, AMD Ryzen 5 and AMD Ryzen 7 are some of the latest computer processors.

5. What is the difference between a 32-bit processor and a 64-bit processor?

A 32-bit system can access 232 memory addresses or 4 GB of RAM. A 64-bit system can access 264 memory addresses or 18 billion GB of RAM. Any amount of memory above 4 GB can be easily handled by the 64-bit processor.

6. What is an operating system? Name some of the popular operating systems.

An operating system is software that allows computer hardware to communicate and work with computer software. It basically provides an interface between the user and the computer system. Microsoft Windows, Linux and OSX are some of the popular operating systems.

7. What is Primary Memory and Secondary Memory?

Primary memory (RAM) is the main memory of a computer that the CPU has direct access to. Main memory stores temporary information until the end of the process. Secondary memory (file storage device) refers to the external storage device that can be used to store data or information permanently.

8. What is the chipset?

A chipset is a collection of integrated circuits designed to work together as a unit to perform a particular task within a computer system.

9. What do you know about the OSI model?

OSI (Open Systems Interconnection) is a reference model for how applications communicate on a network. It consists of seven layers: physical, application, presentation, session, transport, network and data link.

10. What do you know about the TCP/IP model?

TCP/IP stands for Transmission Control Protocol and Internet Protocol. This is the network model used in the current Internet architecture. Here, protocols are a set of rules that maintain communication over a network. It consists of four layers: network access layer, internet layer, transport layer and application layer.

11. What is the difference between system software and application software?

System software is software used to operate and communicate with computer hardware. It provides a platform to run application software. Application software is specific software used by the user to perform specific tasks.

12. Difference between a router, a modem and a switch?

A modem is a device that connects to the Internet.

A router is the “traffic controller” of a network. It brings the information provided by the modem to the various connected devices and creates an internal private IP address which is translated to network address (NAT).

A switch is simply a device that connects multiple devices on the same network. Unlike a router, a switch is designed only to facilitate communication between devices on the same network.

13. What do you know about the Internet and the World Wide Web?

The internet is a large network of networks, a network infrastructure consists of several large networks. The World Wide Web, or Web, is a way of accessing information on the Internet.

14. What is the difference between data, information and program?

Data is raw, disorganized facts that must be processed to make sense. Information is a collection of data that is meaningfully processed in accordance with the given requirement. A program is a specific set of ordered operations to be performed by a computer.

15. What is a programming language?

A programming language is a set of grammatical rules for directing a computer or computing device to perform specific tasks.

16. What is an Algorithm?

An algorithm is a step-by-step process or set of rules to be followed by a computer when solving problems.

17. What is the difference between a compiler and an interpreter?

A compiler takes an entire program and converts it into object code that is usually stored in a file. The object code can be executed directly by the machine after binding. An interpreter directly executes line-by-line instructions written in a programming language without converting them into object code or machine code.

18. Difference between object-oriented programming and procedural programming?

In procedural programming, the most important modules are the procedures. These procedures are a sequence of imperative statements, such as assignments, tests, loops, and subprocedure calls. These procedures are functions that assign arguments to return statements.

Read also 20 most frequently asked IT interview questions

In object-oriented programming, the main modules of a program are classes rather than procedures. The object-oriented approach allows you to create classes and objects that model real-world objects.

19. What do you know about SDLC?

SDLC or Software Development Life Cycle is a process that produces the highest quality software at the lowest cost in the shortest possible time. SDLC consists of several phases including planning, design, build, test and implementation.

20. What do you know about software testing?

Software testing is a process of running an application to find software errors. It can also be described as the process of validating and verifying the proper functioning of software. Types of software testing include alpha testing, beta testing, etc.

21. What is a Database Management System or DBMS?

The DBMS is a system for creating and managing databases. It provides users and programmers with a systematic way to create, retrieve, update and manage data.

22. What is the meaning of an IDE?

An IDE (Integrated Development Environment) is a GUI-based tool designed to help a developer create software applications with an integrated environment combined with all the required programs and libraries at their fingertips.

23. What is a framework?

A framework is a software application development platform that provides a foundation on which software developers can create programs for a specific use. For example, a framework may contain predefined classes and functions that can be used to process inputs, manage hardware devices, and communicate with system software.

24. Definition of AI, Machine Learning and Deep Learning

Artificial intelligence is the umbrella term for computers that think the way humans think, are able to simulate the kinds of things humans do, and ultimately solve problems better and faster than we do.

Machine learning is a self-adaptive algorithm that improves analyzes and models with experience or with newly added data.

Deep learning, on the other hand, is a subset of machine learning and uses a hierarchical level of artificial neural networks to run the machine learning process.

25. What is cryptography?

Cryptography is a means of protecting factual information and communications through codes so that only those for whom the information is intended can read and process it.



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