These NCERT solutions for class 11 Computer Science help the student get full and accurate answers to subjective and objective type questions. From our endeavors at Orchids International School, we ensure that the best material is provided to the students for mastering these very crucial concepts in Class 11 of Computer Science, particularly in tough subjects like Computer Science. So mapped as "Computer System" itself, the NCERT Class 11 Computer Science Chapter 1 Solution covers all the elements that would acquaint candidates with the computer, hardware, and software.
The NCERT Solution Class 11 Computer Science Chapter 1 – Computer System are tailored to help the students master the concepts that are key to success in their classrooms. The solutions given in the PDF are developed by experts and correlate with the CBSE syllabus of 2025-2026. These solutions provide thorough explanations with a step-by-step approach to solving problems. Students can easily get a hold of the subject and learn the basics with a deeper understanding. Additionally, they can practice better, be confident, and perform well in their examinations with the support of this PDF.
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Students can access the NCERT Solution Class 11 Computer Science Chapter 1 – Computer System. Curated by experts according to the CBSE syllabus for 2025–2026, these step-by-step solutions make Computer-Science much easier to understand and learn for the students. These solutions can be used in practice by students to attain skills in solving problems, reinforce important learning objectives, and be well-prepared for tests.
Name the software required to make a computer functional. Write down its two primary services?
To make a computer functional operating system is required. The two services of primary services:
1) Operating system provides services for building and running the application.
2) Operating system provide user interface to the user for enable interaction between computer and user.
How does the computer understand a program written in high level language?
Computer understands only machine level language (0 and 1). High level language is a simple English type language written in some symmetric format. To convert high level language into machine language there is need of compiler which can be understood by computer.
Why is the execution time of the machine code less than that of source code?
We know that computer readable language is machine language. So there is no need to convert machine language whereas Source codes are written in high level language. So there is need to convert it into machine language first. Hence, the execution time of machine language is less than source code.
What is the need of RAM? How does it differ from ROM?
RAM (random access memory) is used for quickly accessing a data. RAM is a temporary storage memory and it stores the active using data. Whereas ROM is a read only memory and it is a permanent storage device. Data in RAM is erased when power goes off whereas in ROM data remain as it is.
Differentiate between proprietary software and freeware software. Name two software for each type.
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Proprietary software |
Freeware software |
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Proprietary software is software which is not available freely or publically. |
Freeware software is available anywhere publically. |
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To get Proprietary software there is a need of authenticate license |
To get freeware software there is no need of authenticate license |
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To get Proprietary software we must have to pay for it |
free software are free of charge |
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Example: adobe flash player, winRAR |
Example: Linux, vlc player |
What is the need for secondary memory?
Secondary memory provides a large storage facility as well as it is very cheap .There is a need of secondary storage because it is a permanent storage device. Unlike ROM and RAM secondary memory doesn’t have limited storage.
How do different components of the computer communicate with each other?
Component of a computer communicate with each other with the help of system bus. System bus provides the facility to transfer the data as well as memory address between one component to another.
What is the primary role of system bus? Why data bus is is bidirectional while address bus is unidirectional?
To transfer the data, address, control signal between the computers there is a need for a system bus. With the help of system bus components of a computer can communicate with each other. Data bus is bidirectional because of the two-way transfer process. IT transfers the data among CPU,memory and other peripheral devices. Address bus is unidirectional because whenever the data written in the memory, the CPU places the data on the data bus. After that the address bus provides a specific address to write the data.
Mention the different types of data that you deal with while browsing the Internet.
Different types of data while browsing the Internet:
Structured: the data which is stored in most organized way is known as structured data
Unstructured: the data which is not stored in organized way is known as unstructured data
Semi structured: the data lies in between the structured and unstructured data is known as semi structured data
Identify the category (system, application, programming tool) of the following software:
a) Compiler
b) Assembler
c) Ubuntu
d) Text editor
a) Compiler – Programming tool
b) Assembler – Programming tool
c) Ubuntu – System
d) Text editor – Application
Write the main difference between microcontroller Notes and microprocessor. Why do smart home appliances have a microcontroller instead of microprocessor embedded in them?
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MICRO CONTROLLER |
MICROPROCESSOR |
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Microcontroller used for perform particular task |
Micro processor used for intensive processing |
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Micro controller does not have capacity to perform multiple task |
Micro processor have capacity to perform multiple task |
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Size of micro controller: 8bit,16 bit,32 bit |
Size of microprocessor: 64 bit,32 bit |
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Micro controller is cheaper in cost |
Micro processor is expensive |
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MICRO CONTROLLER consumed less power |
MICRO processor consumed more power |
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Application: microwave oven |
Application: computer, laptop |
Categories the following data as structured, semi structured and unstructured:
Newspaper
Cricket Match Score
HTML Page
Patient records in a hospital
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STRUCTURED |
SEMI STRUCTURED |
UNSTRUCTURED |
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Patient record in hospital Cricket match score |
Html page |
newspaper |
Name the input or output device used to do the following:
a) To output audio
b) To enter textual data
c) To make hard copy of a text file
d) To display the data or information
e) To enter audio-based command
f) To build 3D models
g) To assist a visually-impaired individual in entering data
a) To output audio – Speaker
b) To enter textual data – Keyboard
c) To make hard copy of a text file – Printer
d) To display the data or information – Monitor
e) To enter audio-based command – Mic
f) To build 3D models – 3D Printer
g) To assist a visually-impaired individual in entering data – Braille keyboards
Draw the block diagram of a computer system. Briefly write about the functionality of each component.
INPUT UNIT :
Input unit has following function:
Input unit takes a data instruction from the user for further processing.
We know that computer understand machine language. Input unit converts the data to the machine language (machine readable form)
They are various types of input devices are available like keyboard, scanner, mouse, touch screen devices, etc.
CENTRAL PROCESSING UNIT:
CPU i.e. Central processing unit is responsible for performing all tasks of computer. CPU is like a heart of computer.CPU consists of 3 units:
Primary memory
Control unit
Arithmetic logic unit
ALU:
Arithmetic and logical unit responsible for performing all arithmetic operation like addition, subtraction, multiplication and division .It also responsible for conduct merging, sorting like all sorting techniques .All the calculations of the data perform by ALU.
Control unit:
Control unit is used to control the signals. Control unit receives the instruction, data, and information from input devices and converts it into control signals.
Primary memory:
There are two types of primary memory
RAM
ROM
RAM:
RAM means random access memory.
It is a volatile storage.
The data stored in RAM is temporary.
RAM stores the data of active tasks.
ROM :
ROM mans read only memory.
The data stored in ROM is permanent.
It cannot be erased during the power cut off.
It is a non volatile memory.
OUTPUT UNIT:
An output device is one of the components of a computer. output devices are responsible to convert machine code into the human readable form. Monitor, printer etc. are output devices. The output given by the computer can be in any type like text, graphics, audio, video etc
