Essential Computer Knowledge For Competitive Exam Success in India

General Knowledge of Computers: Key to Ace Competitive Exams in India 

Are you planning to take a competitive exam in India? If yes, then you must be aware of the importance of computer knowledge in these exams. In today's digital era, computer-related questions are becoming more and more prevalent in competitive exams. 

Hence, having a good grasp of essential computer knowledge is vital for achieving success in these exams.

Computer Knowledge

In this blog post, we will discuss in detail the essential computer knowledge that is required to crack competitive exams in India. From basic computer operations to advanced concepts, we will cover everything you need to know to give yourself the best chance of success. 

So, let's dive into the world of computer knowledge and prepare ourselves to ace the competitive exams in India!

Basic Computer Notes

Here are some basic computer notes that can help you get started with understanding computer fundamentals:

  • What are computers? (What is Computer)
  • Features of Computer
  • Limitations of Computer
  • History and Development of Computer
  • Generations of Computer
  • Parts of Computer
  • Applications of Computer
  • Types of Computer
  • What is Memory and its types
  • Cache memory

Computer Hardware

Computer hardware refers to the physical components of a computer system that can be touched and seen. These components work together to process and store data. 

Here are some examples of computer hardware: 

Central Processing Unit (CPU, Random Access Memory (RAM), Hard Disk Drive (HDD), Solid State Drive (SSD), Graphics Processing Unit (GPU), Motherboard, etc.

In this section, you will get information related to the Computer Hardware.

  • Computer Hardware and its Components
  • What are Input Devices and their types (Input Devices of Computer)
    • What is Keyboard and its types
    • What is Mouse and its types
  • Input Devices of Computer
    • What is Monitor and its types
    • What is Printer and its types
    • What is Plotter and its types
  • Storage Devices of Computer
  • Structure of Floppy Disk
  • Structure of Hard Disk
  • Blu-Ray Disk (Blu Ray Disc)
  • Solid State Drive (SSD)

Computer Software

Computer software refers to a set of instructions or programs that tell the computer what to do. It is a collection of computer programs, data, and instructions that are designed to perform specific tasks on a computer system.

In this section, you will get information related to the Computer Software.

  • What is software and its need
  • Types of Software
    • System Software
    • Application Software
    • Utility Software
  • What are Compilers, Interpreters and Assemblers?
    • Computer Languages and its types
    • What are Unicode?
    • High level languages

Number Systems of Computer (Number System)

Number systems in computer science refer to the different ways of representing numerical values using different symbols and rules. 

These number systems are used to represent and manipulate numerical data in digital devices such as computers. The most commonly used number system in computer science is the binary number system, which uses only two digits, 0 and 1, to represent numerical values. 

Binary numbers are used to represent digital signals and are fundamental to digital electronics.

In this section, you will get information related to the number system.

  • What are number systems? 
  • What are computer code systems?
  • What are ASCII codes?
  • What are binary, octal, decimal and hexadecimal?
  • octal number system
  • decimal number system
  • hexadecimal number system
  • How to Change Binary to Decimal
  • How to Change Hexadecimal to Decimal
  • Binary Addition / Binary Subtraction/ Binary Multiplication/ Binary Division


  • What is communication? What is Communication
  • Components of Communication
  • Types of Communication
  • Topology
  • Types of Network

Computer Virus and Antivirus

A computer virus is a type of malicious software (malware) that infects a computer system and spreads from one computer to another. 

It can cause damage to files, steal personal information, and disrupt normal computer operation. Computer viruses can be spread through email attachments, downloaded files, infected websites, and infected software.

To protect computer systems from viruses, antivirus software is used. Antivirus software is a type of software that is designed to detect, prevent, and remove computer viruses. 

It works by scanning files and programs for known virus patterns and behaviors. If a virus is detected, the antivirus software can either remove it or quarantine it, preventing it from spreading to other parts of the system.

Antivirus software can be installed on a computer system and updated regularly to protect against the latest viruses. It can also be used to scan external devices such as USB drives, which can be a common source of virus infections.

While antivirus software can be effective in protecting against known viruses, it may not always be able to detect new and unknown viruses. 

Therefore, it is important to practice safe browsing and email habits, such as avoiding suspicious websites and email attachments, and keeping software up-to-date with the latest security patches.

In this section, you will get information related to the Computer Virus and Antivirus.

  • What is Virus?
  • History of Virus
  • How do computer viruses spread?
  • A few prominent computer Viruses
  • Types of Computer Virus
  • Computer Antivirus Program
  • How do antivirus work?


Some of the differences related to computers so that you can better understand the difference between two things, which are as follows -

  • Difference between compiler and interpreter
  • Difference between Primary and secondary memory
  • Difference between RAM and ROM
  • Difference between SRAM and DRAM Memory
  • Difference between Impact and non impact printer


The internet is a global network of interconnected computer systems and devices that communicate with each other using standardized communication protocols. It allows people all over the world to connect and exchange information, services, and ideas with each other in real-time.

In the field of computer science, the internet is an essential tool for communication, research, collaboration, and commerce. 

It has revolutionized the way people access and share information, communicate with each other, and conduct business. 

The internet has created new opportunities for entrepreneurship, education, and social interaction, making it a key driver of global innovation and progress.

Some of the most important features of the internet include:

  • Information sharing: The internet provides access to vast amounts of information, allowing people to research and learn about almost any topic.

  • Communication: The internet enables people to connect with each other in real-time, regardless of their location, through email, social media, messaging apps, and video conferencing.

  • E-commerce: The internet has made it easier for businesses to reach customers worldwide, and for consumers to purchase products and services online.

  • Cloud computing: The internet has made it possible to store and access data remotely, making it easier for people to work together and access information from anywhere in the world.

Overall, the internet has had a significant impact on the field of computer science and has transformed the way people live, work, and interact with each other.

In this section, you will get information related to the internet.

  • What is Network and its types
  • Advantages and Applications of Network
  • Components of Network
  • Wireless Network
  • Network Cables
  • What is the internet? 
  • Explain the applications of Internet (Applications of Internet)
  • Internet Terminology
  • Difference between Intranet and Internet
  • Internet Connectivity
  • What are URLs (Uniform Resource Locators)?
  • What is Search Engine and How do Search Engines Work?
  • What is World Wide Web and its features
  • What is client server architecture?
  • Explain Web Browser.
  • What is Portal
  • What is Protocol
  • Remote login & Telnet Concept
  • Internet Chatting
  • ISP (Internet service provider) Internet service provider
  • Web Publishing
  • Web Server
  • What is Internet Security
  • Growth of Internet
  • IP address
  • What is Video Conferencing
  • Services of Internet in hindi
  • What is Malicious software and its types
  • internet Threats
  • What is internet Attacks
  • Cloud Storage

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