3.pdf 1 01/10/2018 18:17:23COMPUTER 3 STUDIES
TABLE OF CONTENTSCOMPUTER BASICS 01 - 071. HOW DOES A COMPUTER WORK? 08 - 16 17 - 26PARTS OF A COMPUTER 27 - 352. MORE ON KEYBOARD 3. HARDWARE AND SOFTWARE 36 - 45 46 - 58OPERATING SYSTEM 59 - 694. LET’S LEARN OPERATING SYSTEMDRAWING AND TYPING5. DRAWING WITH MS PAINT 6. UNDERSTANDING MS WORD LET’S LEARN TO PROGRAM7. GETTING STARTED WITH MSWLogo Computer_Toc_Class_3.indd 1 9/18/2018 4:00:22 PM
1Lesson HOW DOES A COMPUTER WORK? Hello, Kids! Remember me? I am Clicko. Today, we will learn how a computer works. Let Us StartNow, we are familiar with what a computer is and what its parts are. Can youidentify the main parts of a computer? Let Us Do 1: Write the names of the parts in the given boxes.Today, computers are used in most places because they are fast, accurate andsafe to work with. Do you know that a computer cannot work on its own?We need to enter letters, numbers and commands into the computer. This iscalled Data Input.Computer_Grade3.indb 1 1 7/31/2018 11:30:01 AM
In this We will learn about how a computer works in the ‘Input-Process-lesson Output’ Model.A computer works step by step. We can divide this whole process into threephases:1. Input 2. Processing 3. OutputIPO ModelA computer is a machine that works on the principle of the IPO or Input-Process-Output Model.The picture below shows the IPO model: Input Processing OutputSome of our daily activities also involve this IPO model. Let us see some examples.Dirty Clothes Washing Clean clothes Blunt Pencil Sharpening Sharpened Pencil 2 7/31/2018 11:30:02 AMComputer_Grade3.indb 2
Let Us Do 2: Write the correct word (Input, Output or Processing) in the given blanks:DO YOU The word ‘computer’ comes from the word ‘compute’,KNOW? which means ‘to calculate’. Come on, Friends! Let us learn how a computer processes the input to give us output. Let us also find out about the different input and output devices.InputComputers need data to work. Any Fig. 1.1 Input Exampledata or information we send to acomputer for processing is calledinput. Input is sent to the computerusing an input device.Examples of input devices are keyboard, mouse, scanners, video cameras andmicrophones.ProcessingProcessing is the method of taking input data and changing it to output. It occurs in theCPU of the computer. CPU converts data from the input devices into useful information.What we see on the screen is the result of our given data. It is processed by someprogram so that we can have the output.Computer_Grade3.indb 3 3 7/31/2018 11:30:04 AM
DO YOU ‘The first CPU was developed KNOW? by Federico Faggin and Ted Hoff in 1971.’ Federico Faggin Ted HoffOutputAny information sent out from a computer iscalled output. It is the result of processing of theinput. A simple example of output is anythingyou view on your computer monitor.In Fig. 1.2, data is being sent from a computer Fig. 1.2 Output Exampleto a printer. This is called output. This data is then printed onto a sheet of paper,which is also a form of output.N ow, let us understand better with the help of an example:To know the result of 5 x 5, we type ‘5 x 5 =’ using the keyboard. So, ‘5 x 5 =’ is theinput and the keyboard is the input device. Now, the CPU solves this and givesyou the result as ‘25’. It displays the result on the monitor. Hence, ‘25’ is the outputand the monitor is the output device.Glossary 1. Compute – To calculate 2. Data – Information like your address, phone number, class, etc. fed into the computer 3. Input – Information sent to the computer for processing 4. Output – Processed information sent out by the computer 5. Processing – Act of taking input data and changing it into useful output 4 7/31/2018 11:30:07 AMComputer_Grade3.indb 4
Inside the Lab Teacher’s Notes• Discuss with learners different examples of input or output devices.• H ave a class quiz on the terms ‘Input’, ‘Output’ and ‘Processing’ to reinforce the understanding of these terms among learners.• G uide and help them draw a few examples from daily life which follow the IPO Model in MS Paint (as given under learner’s note).Learner’s N ote• Name any five parts of a computer that you see in your computer lab.• You have already learnt drawing in Grade 2 using MS Paint. To revise the same, try to draw pictures to show the stages of growth of a plant from a seed. Mark the three parts of the IPO Model in the pictures as:(a) Sowing of a seed(b) Sun shining and water drops falling on the baby plant(c) Baby plant turning into a big plant or tree with flowers Exercise1) Multiple Choice Questionsa) The information sent to the computer is called (A) data (B) output (C) device (D) mouse (D) monitorb) Processed information sent out by the computer is (D) printer (A) output (B) input (C) device c) Input to computer can be given through (A) screen (B) keyboard (C) speaker Computer_Grade3.indb 5 5 7/31/2018 11:30:09 AM
2) True or Falsea) The CPU was invented in 1971. __________b) Processing takes place in the keyboard. __________c) Mouse is an input device. __________3) Fill in the blanksa) The word ‘compute’ means _______________.b) Any hardware that shows information is an __________ device.c) We need to enter ___________ as an input into the computer.4) Match the followinga) Input (i) b) Processing (ii) c) Ted Hoff (iii) Inventor of CPUd) Output (iv) The act of taking input data and changing it into output5) Very Short Answer Questionsa) Give an example of Input, Process and Output from your daily life.Ans. __________________________________________________________________________ __________________________________________________________________________b) Name two input devices.Ans. __________________________________________________________________________ __________________________________________________________________________6) Short Answer Questionsa) What do you mean by processing?Ans. __________________________________________________________________________ 6 7/31/2018 11:30:09 AMComputer_Grade3.indb 6
__________________________________________________________________________b) What do you mean by input?Ans. __________________________________________________________________________ __________________________________________________________________________7) Long Answer Questiona) How does a computer system work?Ans. __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________8) Picture Based Question Identify the given picture. Which part of a computer is this? Explain how it helps in the working of a computer.Ans. __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ACTIVITY: Complete the table. Machine Input Process OutputSewing machine ________________ ShirtRice cooker Cloth, ThreadJuicer ________________ ________________Telephone Raw Rice, Water Juice ________________ Squeezing Dialling a Connecting the ________________ number numberComputer_Grade3.indb 7 7 7/31/2018 11:30:09 AM
Less on MORE ON KEYBOARD 2 Hello, Friends! I am back. In grade 2, we learnt about the keyboard. Do you want to learn more about the keyboard and its keys? Let Us StartIn the previous lesson, we learnt that we input data into the computer. It is doneusing a mouse or a keyboard.Whenever we want to write in the computer, we use the keyboard. Let Us Do 1: Let us see how much you know about the keyboard.1. Circle the key which is situated directly to the right of this key.2. Circle the key on which the given star symbol sits.In this We will learn about the keyboard, its different keys, types and theirlesson functionalities. 8 7/31/2018 11:30:13 AMComputer_Grade3.indb 8
The keyboard is the most basic input device. It is made up of many small buttonscalled ‘keys’. It allows us to enter letters, numbers and symbols into the computer.The given image (Fig. 2.1) shows a regular 104-keys keyboard.DO YOU Fig. 2.1 KeyboardKNOW? Christopher Latham Sholes (1819-1890) is known as the ‘Father of the Typewriter’.There are various types of keys on a keyboard (Fig. 2.2) such as:1. Alphanumeric Keys2. Punctuation Keys3. Navigation Keys4. Function Keys5. Modifier Keys6. Special keys7. Toggle Keys Fig. 2.2 Different Sets of Keys The keyboard layout is known as QWERTY as these are the first six letters in the first row of letters.Let’s have a look at some keys in the keypad section.Computer_Grade3.indb 9 9 7/31/2018 11:30:14 AM
Alphanumeric KeysThese keys refer to either letter or number keys. The number keys are located in twoplaces on the keyboard. They are above the letters and to the right of the letters. Fig. 2.3 Alphanumeric KeysNumeric KeypadIt is a group of keys located on the right side of the keyboard. It looks like acalculator. It has a plus sign, minus sign, Enter key, Delete key and Num Lock key.Punctuation KeysThe punctuation keys are related to punctuation.These are the comma (,), slash (/), colon (:), semicolon (;) and period (.) keys.All of these keys have multiple uses. For example, theslash key (/) doubles as the question mark (?) key.To type the upper symbols, we need to press the key Fig. 2.4 Punctuation Keyswhile holding the Shift key.Navigation KeysThese keys are also known as cursor or arrow keys. The Fig. 2.5 Navigation Keysconsist of four arrows. One is pointing up, one pointingdown, one pointing right and one pointing left.We can also change the position of the cursor using thekeys mentioned below:Page Up, Page Down, Home and EndDO YOU This key is called the Windows Key. It opens theKNOW? start menu of Windows. 10 7/31/2018 11:30:15 AMComputer_Grade3.indb 10
Let Us Do 2: Draw the arrow keys and complete the sentence given below: These keys are also called __________________.Function KeysThe keys from F1 to F12 are known as Function Keys. These are lined along the topof the keyboard. The Function keys have many uses. Fig. 2.6 Function KeysModifier KeyA modifier key is a key on a computer’s keyboard that is only used together withanother key. They perform computer keyboard shortcuts and other commands.Modifier keys include Shift, Control and Alt.For example, in many text editor programs, pressing Ctrl+Awill select all text.When the Shift key is pressed at the same time as a letterkey, an upper case version of that letter is produced. Forother non-letter keys, this action provides the symbol that isabove the main symbol or number on the key.These shortcuts are useful for managing files. Fig. 2.7 Modifier Keys Ctrl+S S ave Ctrl+C Copy Ctrl+O Open Ctrl+V Paste Ctrl+N New Ctrl+X Cut Ctrl+Z Undo Ctrl+A Select AllComputer_Grade3.indb 11 11 7/31/2018 11:30:16 AM
Let Us Do 3: Look at the keyboard and write which keys you will press to get the signs given below on the screen. One has been done for you. % ____s_h_i_ft__+_5__________ # ____________________ @ ____________________Special KeysSpecial Keys on the keyboard have specific tasks.Tab– Move between the items or move forward five charactersEsc Key– Is used to cancel or stop any commandSpacebar Key– It is the longest key on the keyboard. It is used to give one spacewhile typing.Backspace Key– Is used to erase letters towards the left of the cursorDelete Key– Is used to remove letters towards the right of the cursor or deleteselected text or objectsInsert Key– Is used to insert any letter or image while typingPrtscr Key– Pressing the Print Screen key captures an image of your entire screen Let Us Do 4: Meena has typed the following sentence on the screen but forgotten to use the spacebar key to separate the words. Mark with a coloured pencil the places where she should have pressed the spacebar key. Ilikereadingbooksandwatchingcartoons.Toggle KeysA toggle key is a key that is used to turn a function on or off.Caps lock key and Num lock key are examples of toggle keys.Num Lock– Turning the Num Lock key on allows us to use the numbers on thekeypad. When the Num Lock key is off, the arrows and special keys on thenumber pad are not active.Caps Lock– When we press the Caps Lock key, the feature is ON and that lets us typecapital letters. To go back to typing lower case letters, press the Caps Lock key again. 12Computer_Grade3.indb 12 7/31/2018 11:30:18 AM
Let Us Do 5: Sam wrote the names of five of his friends on the computer. Mark the ones which were written with Caps Lock on. AVANTIKA ANIRUDH VIVAN bella mihikaGlossary 1. Alphanumeric Keys – Alphabet and number keys 2. Caps Lock – Enables or disables all the letters from being typed in upper case 3. Enter Key – Used to send the cursor to the next line or execute a command or operation 4. Function Keys – Keys F1 to F12, have special function sets 5. Keyboard – Primary input device of a computer 6. Prtscr – Sends the current screen image to the computer clipboard or the printer 7. Toggle – Switches a feature on a computer on and off by pressing the same button or keyInside the LabLet’s practise a little of what we just learnt. Teacher’s Notes• Explain to the learners the different types of keys on the keyboard. Also, it must be explained that there are several types of keyboards available.• G ive enough practice on using both their hands to type on the keyboard.• O pen Notepad and help students practise typing and complete the activities given in the lesson.Computer_Grade3.indb 13 13 7/31/2018 11:30:21 AM
• E xplain to the learners the different functions of the modifier keys.• E mphasize the difference between the Caps Lock and the Shift keys. Let learners try using the Shift key with an alphabet key while the Caps Lock is ON.Learner’s Note• Open Notepad and type your name in capital letters. Then, write three sentences about your school using proper punctuation.• W rite the names of any five states of India in Notepad.. Exercise1) Multiple Choice Questionsa) Keyboard was developed by (A) Christopher Sholes (B) Christian Shol (C) Steven Shale (D) Bill Gatesb) The modern keyboard is based on (A) printer (B) blackboard (C) typewriter (D) mousec) The keys on a keyboard which are used with other keys are called (A) toggle keys (B) modifier keys (C) alphabet keys (D) symbols2) True or Falsea) A keyboard in general has more than 100 keys. __________b) The keyboard can be used to draw pictures. __________c) To type ‘&’ using a keyboard, we use the number key 8along with the Shift key. __________3) Fill in the blanksa) A key that begins with ‘C’ that is used for shortcuts is called ___________ key.b) Esc key is also called _______________ key.c) ________________ key enables or disables all the letters from being typed in upper case. 14 7/31/2018 11:30:23 AMComputer_Grade3.indb 14
4) Match the following (i) Toggle keya) b) (ii) Print Screenc) (iii) Start Menud) (iv) Longest key5) Very Short Answer Questionsa) Which key is used to move the cursor to the right by many spaces?Ans. __________________________________________________________________________ __________________________________________________________________________b) Name the modifier keys.Ans. __________________________________________________________________________ __________________________________________________________________________6) Short Answer Questionsa) Write the difference between Backspace and Delete key along with examples.Ans. __________________________________________________________________________ __________________________________________________________________________b) Describe the Toggle keys.Ans. __________________________________________________________________________ __________________________________________________________________________7) Long Answer Questiona) Describe the special keys of the keyboard along with their functions.Computer_Grade3.indb 15 15 7/31/2018 11:30:23 AM
Ans. __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________ __________________________________________________________________________8) Picture Based Question Fill in the blank Keyboard: Match the colour codes with the type of keys they indicate: Navigation keys Function keys Control keys Numeric keys Alphanumeric keysACTIVITY: Write down the keys that you will press to enter the following. (Anexample is given.)Know@ type Caps on K Caps off N O W Shift and @ Space T Y P ECom#puteEA gle 16 7/31/2018 11:30:23 AMComputer_Grade3.indb 16
3Lesson Har dware AND Software Friends, by now, we know about the different computer devices and the way they work. Do you remember the types of devices? Let’s recall and learn more about these. Let Us StartThe invention of the computer has had a huge impact on our day-to-day lives.They are now present all over– at home, at work and in school.In the first lesson, we learnt that the computer works on the p inciple of the Input-Process-Output model. It accepts data, processes it and gives the result. Input devicesare used to get data into the system. The output devices show the results of processing.Do you remember the names of input or output devices? Can you identify them? Let Us Do 1: List the devices and decide whether each device in the box is an input or output device. Device Input Or Output Keyboard, monitor, speaker, scanner, printer, mouse, microphone, joystick, webcam, projectorComputer_Grade3.indb 17 17 7/31/2018 11:30:27 AM
A computer system consists of two major elements. They are Hardware andSoftware. To make all the input and output devices work together, we need bothhardware and software.In this We will learn lesson • The hardware and software components of a computer • Functions of different computer partsHardware is the physical parts of a computer.Software is the programs that run on a computer.Without hardware, the software would not beable to run. They need each other.HardwareComputer hardware refers to the electronic parts Fig. 3.1that we can touch and feel. It includes all the input and output devices that welearnt about earlier.The devices which are connected to the CPU by wires or wirelessly areknown as Peripheral Devices.Hardware is classified into four types of devicesDO YOU Fig. 3.2KNOW? Hardware also includes the cables, connectors and power supply units. 18 7/31/2018 11:30:29 AMComputer_Grade3.indb 18
While processing, the computer saves the data or result in storage devices.Let us learn about them one by one.Input devicesInput devices consist of the external parts by which we give data and commandsto the computer.Common input devices are keyboard, mouse, scanner, etc.KeyboardThe keyboard is used to enter data into thecomputer system. It can type letters, numbers, etc.MouseThe mouse is a pointing device. It is used to give commands to thecomputer.JoystickA joystick is used to play games on a computer.ScannerWe use a scanner to copy a document and input it into a computer.MicrophoneThe microphone allows us to input sounds like our speech and songs intothe computer.W ebcamA web camera takes pictures and puts it into the computer.Processing DevicesCPUThe Central Processing Unit, which is called the brain of thecomputer, is also hardware. It is the most important part of thecomputer. It controls all the other parts and does all the calculationsof the computer.Computer_Grade3.indb 19 19 7/31/2018 11:30:30 AM
Output DevicesOutput hardware consists of devices that transfer information from the computerto the user. Below are some examples of hardware output devices:MonitorThe computer displays the result of processing on a TV-like display screencalled monitor. The monitor is also known as VDU (Visual Display Unit).PrinterThe printer can print the results of our work on paper. The outputis called a printout.ProjectorIt takes images from a computer and projects them onto a large,flat surface.SpeakersYou can listen to music, speeches or sounds from a computer througha speaker.Storage devicesAny hardware that stores information in a computer is called a Storage Device.Let’s have a look at some of the hardware storage devices.Hard DiskA hard disk is a data storage device. It is used for storing andrecovering large volumes of data.CD or DVDIt is a round disk with a shiny surface. It is used to store largeamounts of data, mostly games, videos, movies, songs, etc.USB Pen Drive (F lash Drive)It is a handy storage device and connects to the computer viathe USB port. It can also be used to store or transfer data from onecomputer to another. 20 7/31/2018 11:30:30 AMComputer_Grade3.indb 20
Let Us Do 2:What do you call the objects shown in the picture?�����������������������������������������������Are they hardware or software?�����������������������������������������������The computer hardware mentioned above is controlled by a list of commandscalled Software. Let us learn more about it.SoftwareSoftware refers to the part of the computer which we cannot touch. It exists in theform of commands which make the computer work.A set of commands is called a program and one or more programs is termed assoftware.DO YOU The games you play on the computer are software.KNOW?Let us take the example of a TV.The TV itself is hardware. But, theprograms we watch on TV aresoftware.T here are two main types of software.System SoftwareThe system software makes a computer useful. It helps all parts of a computerwork together. The OperatingSystem is the most importantsystem software. It is the firstsoftware loaded into thecomputer memory.Some examples of system Microsoft Windows MAC OSsoftware are:Computer_Grade3.indb 21 21 7/31/2018 11:30:31 AM
Microsoft W indows, MAC OS, Linux, UnixDO YOU As CPU is the brain of a computer, the Operating systemKNOW? is known as the ‘heart of a computer’.Application SoftwareApplication software is designed to perform a specific task. For example, MSPaint is used for drawing and colouring. Notepad is used for typing text. We useCalculator for calculation. Some more examples includeMS W ord, MS PowerPoint, Media Player, Games Let Us Do 3: Identify the following software from their icons.Which among these is a system software? _________________________________Glossary 1. application Software – Set of programs designed to perform a specific tas 2. Calculator – Software capable of performing mathematical calculations 3. Debugging – Removing errors from a program is called debugging. 4. Hardware – Physical parts of a computer that we can see and touch 5. Media Player – A media player is a computer program for playing videos, movies and music. 6. Program – A computer program is a collection of instructions that performs a particular task when executed by the computer. 7. Software – Set of computer programs that perform a specific task 8. User – A user is a person who uses the computer. 22 7/31/2018 11:30:34 AMComputer_Grade3.indb 22
Inside the LabLet’s practise a little of what we just learnt. Teacher’s Notes• Discuss the role of hardware and software with learners.• Show learners various hardware components available in the computer lab.• Explain the various types of software.Learner’s Note• Collect information about any three hardware other than those given in the chapter.• Name fiv software present in the computer inside your lab. Exercise1) Multiple Choice Questionsa) Brain of the computer is (A) hardware (B) software (C) both (A) and (B) (D) none of theseb) The output from a printer is called (A) operating system (B) software (C) hardware (D) printoutc) MS Paint and Notepad perform particular tasks for (A) operating system (B) user (C) CPU (D) computer2) T rue or F alsea) Software used in railway reservation is an example of system software. __________b) MS Windows is a system software. __________c) Application software controls the basic functioning of computer. __________ 23Computer_Grade3.indb 23 7/31/2018 11:30:36 AM
3) F ill in the blanksa) The devices that are used to give data to the computer are called ____________________devices.b) The devices used for displaying the results are called ______________ devices.c) Any hardware that stores information is __________ device.4) Match the followinga) Projector (i) b) Flash Drive (ii) c) Joystick (iii) d) CPU (iv) 5) Very Short Answer Questionsa) Correctly arrange the words in two columns:Keyboard, Mouse, CPU, MS Paint, Notepad, Monitor, Printer, Operating System, Microsoft W ord, Games, Calculator, Windows Media Player Hardware Software 24 7/31/2018 11:30:36 AMComputer_Grade3.indb 24
b) Name the following:i) Two input devices _____________________ , _____________________ii) Two output devices _____________________ , _____________________iii) Two storage devices _____________________ , _____________________Are these devices hardware or software? ________________________6) Short Answer Questionsa) What is hardware? Give examples.Ans. ������������������������������������������������������������������������ ������������������������������������������������������������������������b) Define software. Give examplesAns. ������������������������������������������������������������������������ ������������������������������������������������������������������������7) Long Answer Questiona) Write four differences between hardware and software.Ans. ������������������������������������������������������������������������ ������������������������������������������������������������������������ ������������������������������������������������������������������������ ������������������������������������������������������������������������8) Picture Based Question Identify the following groups of devices or software: (Input, Output, Storage, System Software, Application Software)Computer_Grade3.indb 25 25 7/31/2018 11:30:36 AM
i) ii) _______________________ _______________________iii) iv) _______________________ _______________________ACT IVIT Y: Identify the jumbled words and complete the blanks:1. PUC__________________________ 5. ERPRTNI________________________2. OMINOTR_____________________ 6. AMEWBC_______________________3. OMSUE_______________________ 7. RSCNNEA________________________4. EKBYAODR___________________ 8. YOJCKTIS_______________________ 26 7/31/2018 11:30:37 AMComputer_Grade3.indb 26
Lesson LET’S LEARN OPERATING 4 SYSTEM Hi, Kids! I am back. Do you remember which part is called the heart of a computer? Yes, it is the operating system. Let Us StartWe already know about various parts of a computer. An operating system is themost important thing that runs on a computer. Between the hardware and theapplication software lies the operating system.In this We will learn lesson • Operating system and its types • Different parts of a desktopDid you know that you and your computer speak different languages? It doesnot speak Spanish, Swedish or Chinese; it speaks in ones and zeros. We can’tcommunicate directly with the computer. Here, the operating system comes in.It is a system software.The operating system is the program that lets us talk to the computer withoutknowing its language. It tells the computer how to do its work and run its functions.These days the computer comes already loaded with the operating system.Operating system tasks:• Accepts input from input devices like the mouse or keyboard• Sends output to output devices like the display monitor or printerComputer_Grade3.indb 27 27 7/31/2018 11:30:40 AM
• Identifie peripheral devices• Handles storage data• Loads the application software• Handles system problemsCommon Operating SystemsNowadays, many operating systems are available. Thethree most common are Microsoft Windows, Mac OS Xand Linux. Operating systems use Graphical User Interface. It is pronounced ‘gooey’. It comes with menus, icons and taskbars. A GUI helps us use the mouse to point and click on icons or buttons on the screen.Different operating systems have different GUI. Let’s have a look at the differentoperating systems:Microsoft WindowsMicrosoft created the Windows Fig. 4.1 Windows Operating Systemoperating system in 1985.Over the years, Microsoft hascontinuously updated andreleased many versions ofWindows. As of September2016, the most recent version ofWindows is Windows 10. Otherrecent releases are Windows 8and Windows 7. Windows is themost popular operating system.DO YOU The firs version of Windows, Windows 1.0 was released inKNOW? 1985, two years after the initial announcement made by Microsoft about their new OS. 28 7/31/2018 11:30:41 AMComputer_Grade3.indb 28
Mac OS X Fig. 4.2 Mac Operating SystemMac OS was created byApple in 1984 as part ofMacintosh operating systems.It is the second most widelyused desktop operatingsystem after Windows. Initially,it was named Mac OS X, until2012 when it was changed toOS X. In 2016, with the releaseof MacOS 10.12 Sierra, thename was changed from OS Xto macOS.LinuxLinux (pronounced LINN-ux)is a family of open-sourceoperating systems. It is uniqueamong the popular operatingsystems. Open-source meansthat the operating system isfree and available to peoplefor modifying. Fig. 4.3 Linux Operating SystemDO YOU 21-year-old Linus Torvalds created Linux in KNOW? Finland in 1991.Computer_Grade3.indb 29 29 7/31/2018 11:30:43 AM
Learning Windows DesktopHere, we will learn about the Microsoft Windows desktop. An operating systemneeds a way to communicate with the user. The way the OS interacts with a useris called the interface. MS Windows is the most popular GUI operating system.When we start the computer, the area we look at is called the Desktop. It acts asa work area. The desktop is usually different from one computer to another. Fig. 4.4 Windows DesktopThere are various parts to the Microsoft Windows desktop. Let’s have a look at theparts:Icons: From the top left to the bottom left side of the screen, there are smallpictures or images called icons. These small images represent items such as MyComputer, Recycle Bin, etc. Fun FactWe cannot give the same name to different icons.My Computer:It shows the information stored on the computer. It can also show us thelocation of that information.Recycle Bin:It is the dustbin of your computer. It has all the deleted files 30 7/31/2018 11:30:45 AMComputer_Grade3.indb 30
My Documents:This folder stores our files documents, music, movies, etc.File: A fil is a collection of stored information. Any work that is done is done in afile We have already worked using MS Paint, Notepad, etc. and saved the workin file with different names. Folder: A folder is a container that helps organise file and other folders.Start Button: This button is found on the bottom left of your screen.When we click this button, the list that appears is called the Start menu. Itprovides a central point of access to programs and performs other tasks.Desktop Background:It is the picture we can see behind the objects.Hence, it is known as the desktop background.Taskbar:This bar is placed at the bottom of the desktop. Atthe left-hand corner, the start button is present. At theright-hand corner, there are shortcuts to Speakers,Clock, etc.Glossary 1. Desktop – The screen that comes up when we start the computer 2. File– An object in a computer that stores data and information 3. Folder – A place to store fi es 4. GUI – Graphical User Interface 5. Icons – Different pictures that we can see on the desktop 6. Mac – Short form of Macintosh operating system, developed by Apple 7. Open-source Operating System – This operating system can be modifie and distributed by anyone around the world. 8. Taskbar – It is along horizontal bar at the bottom of the desktop.Computer_Grade3.indb 31 31 7/31/2018 11:30:47 AM
Inside the LabLet’s practise a little of what we just learnt. Teacher’s Notes• B riefl explain the OS loaded on the computers in the school’s computer lab.• Explain the interface of the Windows Operating System.• Show different parts of the Windows Desktop in the school lab.• Ask learners to sort different icons on the desktop.Learner’s Note• See the picture given below and answer the following questions: 32 7/31/2018 11:30:48 AMComputer_Grade3.indb 32
a. Name any folder in the above figure b. Locate the Recycle Bin.• Find out which version of Windows is installed on your computer.• M ake a list of the icons on your desktop. Compare the list with your friends and tick those which are common to all the lists. Exercise1) Multiple Choice Questionsa) The bar at the bottom of the desktop is called the (A) Taskbar (B) Title bar (C) Menu bar (D) Start buttonb) MS Windows is easy to use because of its _____________ User Interface. (A)Graphic (B) Graphical (C) Image (D) Both (A) and (B)c) The firs version of Windows was released in (A) 1995 (B) 1983 (C) 1900 (D) 19852) True or Falsea) The Linux operating system was created by Linus Torvalds. __________b) Files can store any number of folders and files __________c) We can give two different icons the same name. __________3) Fill in the blanksa) Start button is at the __________ side of the taskbar.b) The latest version of Microsoft Windows is __________.c) The ________ folder shows our files documents, music, etc.4) Match the following (i) Iconsa) Has deleted files b) Heart of a computer (ii) My computerc) Small pictures on desktop (iii) Operating systemd) Shows the information (iv) Recycle bin 33Computer_Grade3.indb 33 7/31/2018 11:30:50 AM
5) Very Short Answer Questionsa) Name any two operating systems.Ans. ������������������������������������������������������������������������ �������������������������������������������������������������������b) Name the picture that you see on the monitor in the background.Ans. ������������������������������������������������������������������� �������������������������������������������������������������������6) Short Answer Questionsa) Name two primary tasks of an operating system.Ans. ������������������������������������������������������������������� �������������������������������������������������������������������b) List the different components of a desktop.Ans. ������������������������������������������������������������������� �������������������������������������������������������������������7) Long Answer Questiona) Write a short note on ‘Mac OS’.Ans. ������������������������������������������������������������������� ������������������������������������������������������������������� ������������������������������������������������������������������� ������������������������������������������������������������������� ������������������������������������������������������������������� ������������������������������������������������������������������� 34 7/31/2018 11:30:50 AMComputer_Grade3.indb 34
8) Picture Based QuestionDescribe the different icons in the picture given above with their functions.Ans. ������������������������������������������������������������������� ������������������������������������������������������������������� ������������������������������������������������������������������� �������������������������������������������������������������������ACTIVITY: In the box given below, there are many words which you haveread in this lesson. How many can you find T S L Z X M CGU I D A S K T O P ABC U X T S A C P WJ O M L A X S E J I GN E B R E K G CNXQ N V T P B I L DZA U Q A M A C V OU Z K M I C R O S WF T R F O L D E R SDXComputer_Grade3.indb 35 35 7/31/2018 11:30:51 AM
5Lesson Drawing wit h MS Paint Hey, Friends! You can now draw and colour pictures using Paint. Do you know that Paint has many advanced features using which you can make your drawing more creative? Let Us StartWe are now familiar with the MS Paint program. It is included in all versions ofMicrosoft Windows. We can use Paint to create drawings that range from simpleto detailed and also to edit pictures.So far, you have made drawings in Paint using the tools in the Home tab. Can younow do the following activity to practise? Let Us Do 1: Draw a picture similar to the one given below, using the different Paint tools you have learnt. Colour the picture and save your file. 36 7/31/2018 11:30:55 AMComputer_Grade3.indb 36
In this We will learn some more tools– the Select and Crop features lesson available in Paint. Also, we will learn how to move and copy portions of an image.When Paint opens, we can see an empty window; drawing and painting toolsare located in the ribbon at the top of the window. The following illustration showsthe different parts of the Paint window.Let’s have a quick look at the window (Fig. 5.1). Fig. 5.1 Paint WindowWorking with More T ools Fig. 5.2 Paint RibbonThe Ribbon in Paint (Fig. 5.2) includes a handy collection of drawing tools. We canuse the tools to create freehand drawings and add a variety of shapes to ourpictures. The Magnifier TooThe Magnifier tool (Fig. 5.3) is used to get a closer view of an image. To use themagnifier tool, follow the steps given below: 37Computer_Grade3.indb 37 7/31/2018 11:30:56 AM
Step 1: In the Home tab, select Magnifie .Step 2: Left-click the mouse to zoom in on theimage and right-click to zoom out onthe image.DO YOU Fig. 5.3 Magnifier ToolKNOW? Magnifier tool does not affect the actual image. It just affects how the image appears on our screen.Brushes The tool Brushes lets us paint in various widths and textures. Brush size can be adjusted using the Size option. Using Brushes, we can add additional effects to our image.Size This tool becomes active only after we have chosen either a Brush or a Shape. We can alsoincrease the border thickness of animage using the Size option.In the given image (Fig. 5.4), the Fig. 5.4 Size Toolrectangular shape is selected andthe size of the border is adjusted to5px (pixels). Let Us Do 2: Draw mountains using different sizes of the brush.Drawing a ShapeWe know how to draw many different shapes in Paint.For example, we can draw ready-made shapes, suchas rectangles, circles, squares, triangles and arrows. Didyou know that you can also make your own customshapes by using the Polygon shape? 38 7/31/2018 11:30:58 AMComputer_Grade3.indb 38
P olygon is a shape with three or more sides. Using this tool, you can draw one side of the Polygon at a time. To draw a Polygon:Step 1: Click on the Polygon shape in the Shapesgroup (Fig. 5.5).Step 2: Move the mouse pointer to the DrawingArea. The mouse pointer changes to a cross.Step 3: Choose a colour for the polygon outline.To keep your lines straight, remember to holddown the Shift key as you are drawing your lines.Step 4: To draw the polygon, drag the mousepointer and click at each corner. Keep clicking Fig. 5.5 Polygon Toolthe end points until you want the last line to finish the shape. Double-click whenyou are done. Curve line T ool is used to draw curved lines.Step 1: Click on the Curve tool in the Shapesgroup (Fig. 5.6).Step 2: Move the mouse pointer to the DrawingArea. The mouse pointer changes to a cross.Step 3: Draw a line by dragging the pointer.Step 4: Click where you want one arc of thecurve to be. Fig. 5.6 Curve line toolDO YOU If you want to draw an exact shape, say a square or a circle,KNOW? hold the Shift key while you draw and release the mouse button before you let go of the Shift key.Image SelectionIn Paint, you might want to make a change to part of a picture or an object. Todo this, you need to select the part of the picture that you want to change andthen, make the change.Computer_Grade3.indb 39 39 7/31/2018 11:30:58 AM
Select O ption Fig. 5.7 Select OptionThis option is used to select rectangular areasof an image. How can we select rectangularareas in Windows 7 Paint?Step 1: To select part of a picture or arectangular area, click the Select tool in theImage group.Step 2: Drag the pointer to select the part of thepicture you want to work with.Clipboard MenuThe clipboard menu offers three options– Cut, Copyand Paste. Only when a selection has been madecan the Cut and Copy icons be used. You canmove or copy a part of an image or an entire imageonce it has been selected.The Cut option removes the selected part from itsoriginal place. The Copy option copies the selectedpart, but does not remove it from its original place.You can insert the cut or copied part anywhereusing the Paste option.Follow the steps below: Fig. 5.8 Select Part of ImageStep 1: Select the part of the image you want to cut or copy.Step 2: On the Home tab, click Cut or Copy in the Clipboard group.Step 3: Click Paste in the Clipboard group. The cut Quick Keysor copied part will appear on the top left corner ofthe drawing area. Copy Ctrl+CStep 4: Click and drag the pasted image to the Paste Ctrl+Vposition you want. You can paste the cut or copied Cut Ctrl+Ximage as many times as you want. 40 7/31/2018 11:30:59 AMComputer_Grade3.indb 40
Fig. 5.9 Copy and Paste Fig. 5.10 Cut and PasteDO YOU The cut and copied part of the image is stored in aKNOW? temporary place called Clipboard.Glossary 1. Clipboard – A temporary place where cut and copied items are stored 2. icons – Different pictures that we see on the desktop 3. Magnify – To make something look bigger than it actually is 4. Microsoft – Microsoft Corporation is one of the largest companies in the computer industry. 5. t ool – It is a shortcut button to perform a task. 6. Zoom – To have more detailed view of an imageInside the LabLet’s practise a little of what we just learnt. Teacher’s Notes• Ask learners to create a drawing using some basic shapes present in MS Paint to recap or revise the working of tools and commands.Computer_Grade3.indb 41 41 7/31/2018 11:31:02 AM
• Explain and help learners draw different pictures using Polygon and Curve line tools in Paint.• Ask learners to create a pattern using the different shapes they have learnt.• Explain the difference between the Cut and Copy options.• Ask students to make some images and use the cut, copy and paste options on them.Learner’s N ote• Draw a shape using the shape of your choice. Select the shape and paste it at a new location on the Drawing area.• Make a birthday card for your friend using the tools you have learnt. Exercise1) Multiple Choice Questionsa) The blue bar at the top of the screen is known as (A) Menu bar (B) Title bar (C) Tool bar (D) Ribbonb) All the tools, the colour palette, and most commands are grouped together in the (A) Menu bar (B) Title bar (C) Quick Access Toolbar (D) Ribbonc) The tool that becomes active only after choosing brush or shape is (A) Brush (B) Size (C) Shapes (D) Colors2) T rue or Falsea) Brushes help us paint in various widths and textures. _________b) It is possible to select a part of an image. _________c) The keyboard shortcut for the Cut option is Ctrl+X. _________3) Fill in the blanksa) Color 1 is the _________________ Color and is always __________________ when you open Paint or open a different Paint page. 42 7/31/2018 11:31:04 AMComputer_Grade3.indb 42
b) Color 2 is the __________________ Color and is always __________________ when you open Paint or open a different Paint page.c) If you haven’t yet saved your picture, the name will be shown as ___________________.4) Match the followinga) (i) Control buttonsb) (ii) Clipboardc) (iii) Paint buttond) (iv) Title Bar5) Very Short Answer Questionsa) Write the names of the tools corresponding to following actions: b) Group the following into correct columns: Program name, Control buttons, Help option, Home tab, View tab, Quick Access toolbar, Paint button T itle Bar Menu BarComputer_Grade3.indb 43 43 7/31/2018 11:31:04 AM
6) Short Answer Questionsa) What is Ribbon?Ans. ������������������������������������������������������������������� �������������������������������������������������������������������b) How is the function of Eraser different with right-click and left-click of the mouse?Ans. ������������������������������������������������������������������� �������������������������������������������������������������������7) Long Answer Questiona) Identify and write the functions of the five tools of MS PaintAns. ������������������������������������������������������������������� ������������������������������������������������������������������� ������������������������������������������������������������������� �������������������������������������������������������������������8) Picture Based Question Observe the Figure and answer the questions given below.(a) Identify the shapes used to draw the picture.(b) Name the tab that is selected in the Figure.(c) What is the foreground colour selected in the Figure?Ans. ������������������������������������������������������������������� ������������������������������������������������������������������� ������������������������������������������������������������������� 44Computer_Grade3.indb 44 7/31/2018 11:31:05 AM
ACTI VIT Y:(a) Open a blank drawing window. Try to recreate the Computer Room in MS Paint using the shapes and tools you have learnt. Colour the images of your choice. Save the drawing with the name ‘Computer Room’.(b) Draw the picture given below in Paint. Hint: Use the curve tool to draw the outline of the shape. Use the Clipboard Menu options to complete the drawing. Colour it.Computer_Grade3.indb 45 45 7/31/2018 11:31:05 AM
6Lesson Un derst an ding MS WORD Friends! I think you want to make a fun birthday card for your friend. How can you do this? We learnt to type using Notepad. Is it possible to make a colourful, fun card on Notepad? Let Us StartThere are a lot of programs that are used for typing. They are called Word Processors.We know that Windows is the most popular GUI Operating System. MS WORD is themost popular word processing software. It works in Windows. Let Us Do 1: Draw lines to match the words given in column A with column B to revise the terms learnt in previous lessons. A BNotepad Brain of a ComputerMouse Storage DeviceCPU Give space between two wordsRecycle Bin Text EditorHard Disk Pointing DeviceSpacebar Storage area of deleted files and folderIn this We will learn lesson • To start Microsoft Word and be familiar with the MS Word screen • Different features of MS Word • How to create, open and save a word document 46 7/31/2018 11:31:17 AMComputer_Grade3.indb 46
MS Word is a part of the bigger package called MS OFFICE. It can do much morethan word processing.When you open up MS OFFICE, you will find four main components in it. They areMS WORD (for word processing), MS EXCEL (for making spreadsheet), MS ACCESS(for database management) and MS POWERPOINT (for presentation purposes).However, we will learn only MS WORD in this lesson.DO YOU Microsoft Office suite is a collection of commonly usedKNOW? computer programs made by Microsoft.G etting Familiar with MS WordMicrosoft Word (MS Word) is excellent for creating documents. It is used to createdifferent types of documents that can include graphics and pictures. We canwrite poems, letters, essays and stories. We can even make reports, posters andgreeting cards using MS Word. It allows us to make documents attractive andinteresting by giving the option of adding bullets, borders, shading, etc. MS Word was first released on October 25, 1983. A number of versions of MS Word are available. Some of them are MS Word 95, 97, 2000, XP 2003, 2007, 2010 and 2013. MS Word 2007 is the 12th version of Microsoft’s word processing software.Starting MS WordTo start working on a new Word document or continue working on an existingdocument we need to first open a Word window. To open a new Wor window,Click:Start → All Programs → MicrosoftOffice → Microsoft Office Word2007Computer_Grade3.indb 47 47 7/31/2018 11:31:17 AM
MS Word 2007 InterfaceBelow is the MS Word interface as it appears (Fig. 6.1). It is a blank documentpage ready to start typing in.Let us discuss the important components of the screen or interface. Fig. 6.1 Ms Word ScreenOffice Button It is located in the upper left corner of the screen. Itcontains the basic commands on the File menu. Some of them areOpen, Save, Save As, Print, etc.T itle Bar: The title bar displays the names of the documents. By default,the document is named Document 1.Control Buttons: It is a set of three buttons in the top right corner thatminimise, restore and close the program respectively. 48 7/31/2018 11:31:18 AMComputer_Grade3.indb 48
Search
