NCERT Solution Class 11 Computer Science Chapter 1 Computer System

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NCERT Solution Class 11 Computer Science Chapter 1

Class 11 Computer Science Chapter 1

SUMMARY :

A computing device, also referred as computer, processes the input data as per given instructions
to generate desired output.

Computer system has four physical components viz. (i) CPU, (ii) Primary Memory, (iii) Input Device
and (iv) Output Devices. They are referred to as hardware of computer.

Computer system has two types of primary memories viz. (i) RAM, the volatile memory and
(ii) ROM, the non-volatile memory.

System bus is used to transfer data, addresses and control signals between components of the
computer system.

A microprocessor is a small-sized electronic component inside a computer that performs basic
arithmetic and logical operations on data.

Microcontroller is a small computing device which has a CPU, a fixed amount of RAM, ROM and other
peripherals embedded on a single chip.

Software is a set of instructions written to achieve the desired tasks and are mainly categorised
as system software, programming tools and application software.

Hardware of a computer cannot function on its own. It needs software to be operational or functional.

Operating system is an interface between the user and the computer and supervises the working of
computer system, i.e., it monitors and controls the hardware and software of the computer system.


  Class 11 Computer Science Chapter 1 

Class 11 Computer Science Chapter 1

Q1. Name the software required to make a computer functional. Write down its two primary services.

Q2. How does the computer understand a program written in high level language?

Class 11 Computer Science Chapter 1

Q3. Why is the execution time of the machine code less than that of source code?

Q4. What is the need of RAM? How does it differ from ROM?

Q5. What is the need for secondary memory?

Class 11 Computer Science Chapter 1

Q6. How do different components of the computer communicate with each other?

Q7. Draw the block diagram of a computer system. Briefly write about the functionality of each component.

Class 11 Computer Science Chapter 1

Q8. What is the primary role of system bus? Why is data bus is bidirectional while address bus is unidirectional?

Q9. Differentiate between proprietary software and freeware software. Name two software for each type.

Q10. Write the main difference between microcontroller Notes and microprocessor. Why do smart home appliances have a microcontroller instead of microprocessor embedded in them?

Class 11 Computer Science Chapter 1

Q11. Mention the different types of data that you deal with while browsing the Internet.

Q12. Categorise the following data as structured, semi structured and unstructured:

  1. Newspaper
  2. Cricket Match Score
  3. HTML Page
  4. Patient records in a hospital

Class 11 Computer Science Chapter 1

Q13. 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

Q14. Identify the category (system, application, programming tool) of the following software:
a) Compiler
b) Assembler
c) Ubuntu
d) Text editor

Class 11 Computer Science Chapter 1


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