Gujarat Board Class 9 Solution Computer Chapter 1 Introduction to Computers Exercise Solution here in this Post.
Board |
GSEB Gujarat State |
Textbook |
9 Class |
Medium |
English |
Subject |
Computer Studies |
Chapter |
1 |
Chapter Name |
Introduction to Computers |
Gujarat Board Class 9 Computer Chapter 1 Introduction to Computers Solution:
1) List the basic components of a computer. Describe each in brief?
Ans:- The basic components of a computer are Hardware, Software and Firmware.
i) Software:- Computer is a machine and hence forth it cannot perform any task on its own. It needs data and step by step machine understandable instructions to perform the intended tasks. This set of instructions is called a program. Development of the program becomes easier if a step by step guideline to solve the given tasks called algorithm is designed. The logic prepared for getting the given task done using an algorithm is known as software. Software refers to organized collection of computer programs, data and related documentation (such as comments) about the computer
ii) Hardware:- Unlike software, the hard entities such as keyboard, mouse, central processing unit and the other peripheral entities and hence called hardware. Hardware is a comprehensive term for all physical parts of a computer.
iii) Firmware:- Software instructions many times come integrated along with hardware. Since such software is closely coupled with hardware, it is known as firmware. The software embedded with the hardware usually facilitates use and application of the hardware. It also provides utility to work with other hardware and communicate data when needed. Usually such firmware are developed by the hardware manufacturing company and provided free when one purchase the hardware. For ex- washing machine, traffic lights, digital camera and microwave oven have some software programs inbuilt in the devices.
2) Draw a block diagram of a computer containing basic components of a computer. Explain the diagram?
The basic components of a computer are Control Unit (C.U), Arithmetic and Logic Unit (ALU)Memory Unit (M.U), Input, Output.
1) Input:- The term Input means feeding of data or information into the computer from the outside world. This feeding of data or information into the computer is done with the help of devices known as Input Devices. For ex:- Mouse, Keyboard, Scanner Microphone, Joystick etc. Different devices are used for different purposes like Keyboard is used to input the data or information in a typed manner, Scanner is used to input any document or image into the computer in a scanned manner.
2) Output:- The term Output means releasing of the data or information from the computer to the outside world. In other terms it can be said as, displaying or showing the results to the user for the work done by the computer. The devices which are used to display the results to the user are known as Output Devices. For ex:- Monitor, Speakers, Printer, etc. Here also the work performed by the devices are different like Monitor shows the results of the work done to the user on its screen, Speakers are used to output the data into an audible form, whereas Printers are used to show the result on the paper by printing it.
3) Control Unit:- Control Unit manages to execution of instructions and controls operations of other components of the computer. It controls / looks after entire functioning of the computer system.
4) ALU (Arithmetic and Logic Unit):- The ALU (Arithmetic and Logic Unit) performs the work related to Arithmetic/Calculation such as (Addition, Substraction, Division and Multiplication) and Logical.
ALU (Aritmetic and Logic Unit) and Control Unit (C.U) together forms CPU (Central Processing Unit – The brain of Computer).
5) Memory Unit:- Once the input is collected with the help of input devices, the input is needed to be stored in computer memory. Computer memory holds the data, instructions or processed output for a short or for a long duration of time. Computer memory is classified into two types (i) Primary Memory, (ii) Secondary Memory
(i) Primary Memory:- Primary memory is the main memory. The data stored on such type of memory remains till there is continuous of power supply and can be erased as soon as the power is been cut off. In other terms, the input from different devices goes first to the main memory and will be remained into the memory electronically. The data/ content remains in the main memory until the computer is been switched off. Such type of memory is Volatile (Temporary) in nature. RAM (Random Access Memory) and ROM (Read Only Memory) are examples of such type of memory.
(ii) Secondary Memory:- Secondary storage memory is Non-Volatile in nature. The data or contents stored on this type of memory remains for a long time which means the contents does not get lost even if there is power failure. To preserve the content we need Secondary or Auxiliary storage. Devices that uses secondary memory is called secondary storage devices. Hard disk, Compact Disk, Pen drives, Floppy Disks are the examples of secondary storage devices.
3) What are the popular input devices ?
Ans:- Keyboard, Joystick, Mouse, Barcode Reader, Universal Serial Bus (USB), Hard disks, compact Disks (CD), Scanner, Microphone etc are some popular input devices.
4) What are the popular output devices?
Ans:- Monitor, Headphones, Printers, Speakers, Projectors etc are some popular output devices.
5) Differentiate between Primary Memory and Secondary Memory?
Primary Memory |
Secondary Memory |
It retains data, instructions and processed output for a short period of time. |
It retains the data or contents for a long period of time. |
The contents or data gets lost when there is power failure or when computer is been switched off. |
The contents or data does not gets lost even if there is power failure or when computer is been switched off. |
Volatile in nature |
Non- Volatile in nature. |
6) What is ALU? Give the full form and explain the work of ALU in one line?
Ans:- ALU stands for Arithmetic and Logic Unit. It performs the tasks related to mathematical calculations like Addition, Substraction, Multiplication and Division and logical operations.
7) What is CU? Give the full form and explain the work of CU in one line?
Ans:- CU stands for Control Unit which manages the executions of instructions and control operations of other components of the computer.
8) Which component is called the brain of computer?
Ans:- CPU (Central Processing Unit) is called the brain of the computer because CPU looks after and controls the entire working of a computer system just like human brain which controls the movements or workings of the human body.
11) Define hardware. Give two examples of hardware.
Ans:- Unlike software, the hard entities such as keyboard, mouse, central processing unit and the other peripheral entities and hence called hardware. Hardware is a comprehensive term for all physical parts of a computer.
12)
1) Which of the following is the typical work flow of a computer?
Answer : b) Input, Process, and Output
2) Which of the following identifies the concept of a computer itself remembering the set of Data and instructions to be executed?
Answer: a) Stored program concept
3) Which of the following refers to a set of step by step instructions to perform a given task written in machine understandable format?
Answer: a) Program
4) Which of the following device converts the given data into the machine readable form while entering data into the computer?
Answer: b) Input
5) Which of the following does a computer memory retains?
Answer: d) All of these
7) What is the other name of primary memory?
Answer: b) Volatile
8) What are the following characteristics of secondary memory?
Answer: a) Cheaper and slower than primary memory
9) Hard disk and compact disks (CDs) are examples of which of the following device types?
Answer: b) Secondary
10) Which of the following unit performs the arithmetic and logical computations?
Answer: a) Arithmetic Logic Unit
11) Which of the following unit manages execution of instructions and controls operations of other components of the computer?
Answer: c) Control
12) Which of the following does ALU and Control unit together form?
Answer: a) Central Processing Unit
13) What is an example of an output mechanism?
Answer: c) Printer
14) Which component of a computer is known as the brain of a computer?
Answer: c) Central processing unit
15) Which of the following full form of GIGO?
Answer: a) Garbage in garbage out
16) Which is the following is a component of Software?
Answer: d) All of these
17) Which of the following does the term hardware refers to?
Answer: c) Physical parts of computers