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Informatics PracticesClass 11Computer Chapter System

Computer Chapter System | Class 11 Informatics Practices Notes

By ConceptScroll Team · Published on 17 July 2026 · 3 min read

Computer Chapter System – this guide gives you a concise, exam-ready overview of Computer Chapter System from Class 11 Informatics Practices, written by ConceptScroll editors and reviewed against the latest NCERT textbook.

1.1.2 Input Devices

Input devices are hardware components that allow users to send data and control signals to a computer system. These devices convert user input into digital form that the computer can understand and process. Common input devices include keyboards, mice, scanners, and touch screens. Specially designed input devices such as braille keyboards assist visually impaired users in entering data. Modern input methods also include voice input, exemplified by tools like Google voice search, where spoken words are converted into digital commands or search queries. Data entered through input devices is temporarily stored in the computer's main memory (RAM) before processing. For permanent storage, data and instructions are saved in secondary memory devices. Input devices are essential for human-computer interaction, enabling users to communicate commands and data to the system effectively.

📊 Diagram: Figure 1.2 shows various input devices including keyboard, mouse, scanner, and touch screen, illustrating how users provide data to the computer.

🧪 Activity: Activity 1.2: Visit places like banks, showrooms, or offices to identify 2-3 digital data capturing tools used there.

🔗 Connection: After understanding input devices, the next section discusses output devices that present processed data to users.

Frequently asked questions

1. Name the software required to make a computer functional. Write down its two primary functions.

The software required to make a computer functional is the Operating System (OS). Its two primary functions are: 1. Managing hardware resources such as CPU, memory, and input/output devices. 2. Providing a user interface and platform for running application software.

2. What is the need of RAM? How does it differ from ROM?

RAM (Random Access Memory) is needed to temporarily store data and instructions that the CPU needs while executing programs. It is volatile memory, meaning data is lost when power is off.

ROM (Read Only Memory) is non-volatile memory that permanently stores instructions needed to boot the computer. Data in ROM cannot be modified or is difficult to modify.

Differences:

  • RAM is volatile; ROM is non-volatile.
  • RAM is used for temporary data storage during execution; ROM stores permanent instruc
3. What is the need for secondary memory?

Secondary memory is needed to store data and programs permanently or for long-term use. It provides large storage capacity at a lower cost compared to primary memory (RAM). It retains data even when the computer is turned off.

4. Draw the block diagram of a computer system. Briefly write about the functionality of each component.

Block Diagram of a Computer System includes:

  • Input Unit: Accepts data and instructions from the user.
  • Central Processing Unit (CPU): Processes data and controls operations.
  • Memory Unit: Stores data and instructions temporarily (RAM) or permanently (ROM).
  • Output Unit: Displays or produces the results.
  • Secondary Storage: Stores data permanently.

Functionality:

  • Input Unit: Converts user input into machine-readable form.
  • CPU: Executes instructions, performs arithmetic and logic operat

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