Dear Students, In this article I will provide NCERT Solutions Chapter 1 Computer System for Computer Science Class 11. So let’s begin!
NCERT Solutions Chapter 1 Computer System
The NCERT exercise has the following questions. Read the article NCERT Solutions Chapter 1 Computer System CS Class 11 and give your feedback in the comment section.
- Name the software required to make a computer functional. Write down its two primary services.
- To make a computer functional you need system software. This system software is Operating System.
- Its two primary services are as following:
- Memory Management – It controls and manages the memory unit of a computer system
- Device Management – It controls and manages the devices of computer system
- How does the computer understand a program written in high-level language?
- The computer doesn’t understand the program written in high-level language directly.
- They need to be translated into machine language or binary language using a language translator.
- So it may use a compiler or interpreter to translate the written code into machine language.
- Why is the execution time of the machine code less than that of the source code?
- The program or script written in a high-level language is called source code whereas the translated source code is known as machine code or object code.
- The machine code is translated or converted code through the language translator.
- This machine code is converted or translated into the machine language.
- This machine code or object code is very easily understood by the machine.
- Hence, it needs less execution time.
- What is the need of RAM? How does it differ from ROM?
- RAM is one of the types of memory i.e. primary memory.
- RAM loads the data from secondary memory whenever you open any file on the computer for work.
- It accesses any file randomly and just works like a table or desk in the offices.
- RAM differs from ROM in these aspects:
- RAM loads data from secondary memory, ROM loads data from software loaded into ROM.
- RAM is volatile memory whereas ROM is non-volatile memory.
- RAM plays an important role in providing data for work whereas ROM plays an important role in starting up computers.
- Data written on RAM can be altered or modified by the user whereas data once written on ROM cannot be altered or modified.
- What is the need for secondary memory?
- Secondary memory is something like we are using almirah or racks in our offices to store files.
- Similar way secondary memory stores data for permanent use.
- These data can be accessed anytime in the future as and when required.
- When the work is done or finished by the user, it can be saved for future use in secondary storage devices.
- How do different components of the computer communicate with each other?
- The different components of the computer communicate with each other as per the instructions of the CPU and its parts.
- The CPU communicates and transfers data with other devices using wires. These wires are known as bus.
- There are three types of bus:
- Data Bus – It transfers data between different components of the computer
- Address Bus – It transfers address between CPU and main memory
- Control Bus – It controls signals between the different component of the computer system
- These all three buses together makes system bus
- Draw the block diagram of a computer system. Briefly write about the functionality of each component.
- Follow this link to view the – block diagram of the computer system.
- The computer system has the following four functional parts:
- Input Unit – It is responsible to feed data into the computer system. Data fed by the user using this unit and devices such as keyboard or mouse.
- CPU – The CPU has three subunits – CU, ALU, and MU.
- CU – It accepts the request from CPU and does not perform any task itself. It determines, guides, and controls the request and then sends it to ALU.
- ALU – ALU accepts the request from CU and performs the required task. It checks the request for what kind of task to be performed such as arithmetic operation (Addition, Subtraction, Multiplication or Division) or Logical comparison such as (Less Than, Greater Than, etc.). After completion of the task, it sends the request to the next unit.
- Memory/Storage Unit – It is responsible for storing data in computer storage locations. It stores data permanently or temporarily.
- Output Unit – It displays the output in the form of hard copy or soft copy.
- What is the primary role of the system bus? Why is the data bus is bidirectional while the address bus is unidirectional?
- The system bus is a combination of the data bus, address bus, and control bus. (Refer to answer no. 6)
- The data bus is bidirectional because it transfers data between various devices or components. In data transfer, it needs to transfer from both directions, and the CPU reads data from the main memory or reads data into the memory.
- The address bus is unidirectional because it transfers the address into a single way between CPU and memory. Here CPU is addressing a memory location either reading or writing.
- Differentiate between proprietary software and freeware software. Name two software for each type.
| Proprietary software | Freeware software |
| The proprietary software required a license or subscription to use. | It can be downloaded and installed without any license or subscriptions. |
| It doesn’t allow to copy, share, or redistribute. | It can be copied, shared, and redistributed. |
| The source code is not available for users. | The source code is available and the user can manipulate and redistribute them. |
| Examples – Windows, Microsoft Office etc. | Examples – Linux, LibreOffice etc. |
10. Write the main difference between microcontroller and microprocessors. Why do smart home appliances have a microcontroller instead of a microprocessor embedded in them?
| Microcontroller | Microprocessors |
| It is a small computing device on a single chip. | The microprocessor contains only a CPU on a single microchip. |
| It has a fixed amount of RAM, ROM, and other peripherals. | It built over an integrated circuit comprising millions of small components like resistors, transistors, and diodes. |
| It is very small in size and easy to embed in another device or system. | It can be installed on the CPU socket in the motherboard. |
| It performs some repetitive tasks without human interventions. | It carries out various tasks involved in data processing. |
| Use in Keyboard, Mouse, Microwave, Washing Machine, Digital Camera, Remote Controller etc. | Used in Computers, Laptops, Smartphones etc. |
11. Mention the different types of data that you deal with while browsing the Internet.
While browsing the internet we will get the following types of data:
| Structured Data | Unstructured Data | Semi-Structured Data |
| It follows a specific pattern or structure. | Data that is not organized in a pre-defined format. | It doesn’t follow any specific format |
| It mostly available in tabular form. Hence very easy to understand by users. | There is no specific format. | maintains a specific structure to separate data |
| It may be sorted in either ascending or descending orders. | It stores the random data | It may be a combination of structured and unstructured data |
| Examples – sales transactions, online railway booking, students result data, ATM transactions etc. | Examples data presented in textual forms with graphs and images | Examples CSV files, HTML or XML files etc |
12. Categorise the following data as structured, semistructured and unstructured:
- Newspaper – Unstructured
- Cricket Match Score – Structured
- HTML Page – Semi-structured
- Patient records in a hospital – Structured
13. Name the input or output device used to do the following:
- To output audio – Speaker
- To enter textual data – Keyboard, Touchscreen
- To make hard copy of a text file – Printer
- To display the data or information – Monitor, Projector
- To enter audio-based command – Microphone, Mic
- To build 3D models – 3D Printer
- To assist a visually-impaired individual in entering data – Braille Keyboard
14. Identify the category (system, application, programming tool) of the following software:
- Compiler – Programming Tool
- Assembler – System
- Ubuntu – System
- Text editor – Application
That’s all from NCERT Solutions Class 11 Computer Science Chapter 1 Computer System. I hope you enjoyed this article NCERT Solutions Class 11 Computer Science Chapter 1 Computer System.
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