Important Computer Notes

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Computer Exercise (Long answers)


1. Explain the common features of computer system.

>>> A computer system has several important features that make it powerful and useful:

  • Speed: A computer can perform millions of instructions within a second. It can do complex calculations very quickly.
  • Accuracy: It provides results without any mistakes as long as the input is correct.
  • Automation: Once given instructions, a computer works automatically without needing human help for every step.
  • Storage: Computers can store a large amount of data and information for future use.
  • Versatility: Computers can be used for different purposes like education, business, games, communication, etc.
  • Diligence: Unlike humans, computers do not get tired or bored. They can work for many hours without losing efficiency.
  • Multitasking: Computers can perform multiple tasks at the same time.

2. Why is CPU called "The Brain of a computer system"?

>>> The CPU (Central Processing Unit) is called the "brain of the computer" because it controls and manages all the activities of the computer system. It processes the data, performs calculations, and makes decisions based on the instructions given. Just like the brain controls all the functions in our body, the CPU controls all operations of the computer. It has two main parts:

  • ALU (Arithmetic and Logic Unit): It performs calculations and logic operations.
  • CU (Control Unit): It directs the movement of data and tells other parts of the computer what to do.
  • MU (Memory Unit): It stores required data and information in the system.

Without the CPU, the computer cannot function.

3. Illustrate the function of computer system 

>>> A computer system works in a cycle known as the Input-Process-Output cycle. 

  • Input Unit: Devices like keyboard and mouse are used to enter data into the computer.
  • Processing Unit (CPU): This is where the data is processed and converted into useful information.
  • Output Unit: Devices like monitor and printer show the result of the processing.
  • Storage Unit: Data and instructions are stored temporarily or permanently in storage devices like hard drives and RAM.

4. How is SSD different from HDD?

>>> SSD (Solid State Drive) and HDD (Hard Disk Drive) are both storage devices, but they are different in many ways:


  • Speed: SSDs are much faster than HDDs in reading and writing data.
  • Technology: HDD uses spinning magnetic disks, while SSD uses flash memory with no moving parts.
  • Durability: SSDs are more durable because they have no moving parts and are less likely to break if dropped.
  • Noise: HDDs can make noise due to spinning, but SSDs are completely silent.
  • Cost: SSDs are more expensive than HDDs for the same amount of storage.
  • Power: SSDs use less electricity, which helps in saving battery life in laptops.


5. What is development software? What does it include?

>>> Development software is a type of software that is used to create, design, and test other software and applications. It helps programmers and developers to write code and build programs.

Development software includes:
  • Text Editors and IDEs (Integrated Development Environments): Tools like Notepad++, Visual Studio Code, Eclipse, etc., used to write and edit code.
  • Compilers and Interpreters: These convert the code written by programmers into a language that the computer can understand and run.
  • Debuggers: These help find and fix errors in the code.
  • Database Management Tools: Used to manage data while developing applications.
  • Version Control Systems: Like Git, used to manage changes in code.

Development software is very important in creating websites, apps, games, and all types of computer programs. 

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