Read the Chapter 1 Computer System PDF for free. This is part of the official NCERT Book for Class 11 Computer Science for the 2026-27 academic year. Students can use this book online or offline.
NCERT Class 11 Computer Science Chapter 1 Computer System
Study this fun chapter from NCERT Book Class 11 Computer Science Computer System to learn new things in Class 11 Computer Science. Need help with answers? Check the NCERT Solutions for Class 11 Computer Science to solve every question at the end of the chapter.
Chapter 1 Computer System NCERT Book Class 11 PDF (2026-27)
1.1 INTRODUCTION TO COMPUTER SYSTEM
A computer is an electronic device that can be programmed to accept data (input), process it and generate result (output). A computer along with additional hardware and software together is called a computer system.
A computer system primarily comprises a central processing unit (CPU), memory, input/output devices and storage devices. All these components function together as a single unit to deliver the desired output. A computer system comes in various forms and sizes. It can vary from a high-end server to personal desktop, laptop, tablet computer, or a smartphone.
Figure 1.1 shows the block diagram of a computer system. The directed lines represent the flow of data and signal between the components.
1.1.1 Central Processing Unit (CPU)
It is the electronic circuitry of a computer that carries out the actual processing and usually referred as the brain of the computer. It is commonly called processor also. Physically, a CPU can be placed on one or more microchips called integrated circuits (IC). The ICs comprise semiconductor materials.
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Official NCERT Textbook PDF: Class 11 Computer Science Chapter 1 Computer System
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