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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 · 2 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.

1.1.3 Output Devices

Output devices are hardware components that receive processed data from a computer system and convert it into forms understandable by humans, such as visual display, sound, or physical printouts. Common output devices include monitors, projectors, headphones, speakers, and printers. For visually challenged individuals, braille display monitors provide tactile output of textual information. Printers produce hard copies of digital documents, with common types being inkjet, laserjet, and dot matrix printers. A newer category, 3D printers, can create physical replicas of digital 3D designs and are increasingly used in manufacturing and medical fields to build prototypes and body organs. Output devices are essential for communicating the results of computer processing to users in accessible formats.

📊 Diagram: Figure 1.3 shows various output devices such as monitors, printers, speakers, and a braille display, illustrating different ways processed data is presented.

🔗 Connection: Following output devices, the chapter progresses to the evolution of computers, explaining how these components have developed over time.

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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