Class 4
Sub: Computer
Introduction to Computer
Q.3. Answer the following questions.
a) Write any four electronic machines that we use in our daily life.
Ans: Calculator, Television, Mobile phone, Camera are the four electronic
machines that we use in our daily life.
b) What is computer?
Ans: Computer is an electronic machine that process raw data and gives
meaningful information.
c) Which was the first calculating device in the world?
Ans: Abacus was the first calculating device in the world.
d) What are the four basic parts of computer?
Ans: Keyboard, mouse, monitor and system unit are the four basic parts of
computer.
e) What is the basic working principle of a computer?
Ans: Input >> Process >> Output is the basic working principle of a
computer.
f) Write down any four characteristics of a computer.
Ans: Four characteristics of a computer are : High speed, Accuracy, Diligent,
Versatile
g) Write down any four places where computers are used.
Ans: Computer are used in different places such as home, school, office,
hospital, bank etc.
h. Why are computer called accurate machine?
Ans: If the data and instruction given to the computer are
correct, it will always give correct result so computer are called accurate
machine.
i. Why are computer called versatile machine?
Ans: A computer can perform different of tasks one by one
simultaneously. So, it is called versatile machine.
Basic
Parts of a Personal Computer
Q.1. a) Desktop Computer
b. Laptop Computer
c. Monitor
d. Power Cord
e. Keyboard/mouse
Q.3.
a) What is personal computer or PC.
Ans: A small computer that is designed for one person to use at work or at home
is called personal computer.
b) What are two common types of personal computer?
Ans: Desktop computer and laptop computer are two common types of personal
computer.
c) What is desktop computer?
Ans: A desktop computer is a personal computer designed to fit on a desktop.
d. What is laptop computer?
Ans: A laptop computer is also a personal computer designed for mobile use.
e. Write any two differences between the desktop computer and laptop computer.
Ans: Two different between desktop computer and laptop computer are as follows.
|
Desktop Computer |
Laptop Computer |
|
a. It is bigger and heavier than laptop computer |
a. It is small in size and lightweight than desktop
computer |
|
b. It can not be easily carried around. |
b. It can be easily carried from one place to another
place |
f. What are the basic parts of laptop computer?
Ans: Monitor/screen, Keyboard, Speaker, Touch pad, Laptop Battery, AC Adaptor,
Casing are the basic parts of a laptop computer
Input
devices
Answre the following questions.
a) What are input devices? List any four input devices.
Ans: The devices that are used to give input to the computer are called input
devices.
eg. Mouse, Keyboard, Touch pad, Touch screen, Scanner, Joystick etc.
b) What is keyboard? Write different groups of keys.
Ans: Keyboard is a basic input device of computer. There are many keys in the
keyboard.
Different groups of keys are:
Alphanumeric keys
Control keys
Functions keys
Navigation keys
Numeric keypad
c. What is mouse? How can you hold the mouse?
Ans: Mouse is a basic pointing input device of computer. it is used to point
object and give command to the computer.
We have to hold the mouse gently with our index finger resting on the left
button and thumb resting on the side.
d) What are different mouse actions?
Ans: The different mouse actions are:
i) Pointing ii) clicking
iii) Double clicking iv) Right-clicking
v) Dragging
e.What is web camera?
Ans: Web camera is an input device that takes photos or
videos and puts them into the computer. It is widely used in Internet chatting.
f. What is Scanner?
Ans: A Scanner is an input device that copies images or
printed text and puts them into the computer. it is also called direct entry or
non-keyboard input device.
g. Why do we use joystick in computer?
Ans: We use joystick in computer to play game.
h. What is microphone? Why is it used in computer?
Ans: A microphone is an input device that is used to input
sound or records your voice into the computer. It is also used in internet
voice chatting.
e) Write short notes on:
i) Touch pad : Touch pad is a touch sensitive pad that is used as a
pointing device in portable computer. We can point the objects and give command
with touch pad.
ii) Touch Screen: Touch Screen is a touch sensitive screen. Our finger can
be used for selecting object and giving command to the computer.
iii) Scanner : A Scanner is an input device that copies images or printed
text and puts them into the computer. it is also called direct entry or
non-keyboard input device.
iv) Web cam : Web camera is an input device that takes photos or videos
and puts them into the computer. It is widely used in Internet chatting.
v) Microphone : A microphone is an input device that is used to input
sound or records your voice into the computer. It is also used in internet voice
chatting.
Write a single word for the following:
a) The device which is used to input sound to the computer. Microphone
b) The longest key of the keyboard. Spacebar
c) An input device which is used to take photos and puts into the
computer. Web camera
d) The process of pressing left mouse button and moving it together. Dragging.
Processing
device
Answer the following questions:
a) What is meant by processing?
Ans: Computer convert the input data into meaningful information is called
processing.
b) Write the main processing unit of computer?
Ans: Central Processing Unit (CPU) is the main processing unit of computer.
c) Name the different types of CPU?
Ans: The different types of CPU are: Intel celeron, Intel Core 2 Duo, Intel Duel
Core, Intel Core i3, Core i5, Core i7, Core i9 etc.
d) What are the functions of CPU?
Ans: The main functions of CPU are:
i) It manages all the resources of the computer.
ii) It executes programs instructions.
iii) It makes decisions.
iv) It performs calculations.
e) What are the main components of CPU?
Ans: The main component of CPU are:
i) Control Unit (CU)
ii) Arithmetic Logic Unit (ALU)
iii) Main Memory
f) What is the main memory?
Ans: Main memory also called primary memory or internal
memory is used to store program and data during the processing which is fixed
on the motherboard.
g. What is RAM?
Ans: RAM is the computer's working memory it is used to
store data during processing. RAM is temporary or volatile memory the data
stored in it gets erased when we switch off the computer.
h. Why is RAM called volatile memory?
Ans: RAM is called volatile memory because the data stored
in it gets erased when we switch off the computer.
i) What is ROM?
Ans: ROM is a read-only memory of the computer we can only
read data from it. It is a start-up memory of the computer. The data and
instructions are stored at the time of manufacture. It's data are not lost even
if the computer is switch off.
j. Why is ROM Called non-volatile memory.
Ans: ROM is called non-volatile memory because the data and
instructions are not lost even if the computer is switch off.
Read the clues and write who am I?
a) I am electronic brain of computer. CPU
b) I am the part of CPU, you can perform the
calculation. ALU
c) I am permanent memory of computer. ROM
d) I am non-volatile memory and can store data
permanently. ROM
Output
Devices
Output Device
Answer the following questions.
a) What is output of the computer?
Ans: Computer process input data to produce meaningful information or result is
called output of the computer.
b) What are the output devices? Write two examples.
Ans: The devices, which are used to give the output of the computer, are called
output devices. Examples : Monitor, printer, speaker.
c) Write each example of hard copy and soft copy output devices.
Ans: Monitor shows the soft copy output and printer gives us hard copy output.
d) What is monitor write its types?
Ans: Monitor is a primary output device also known as Visual Display Unit.
It display output in the form of text, pictures and videos.
CRT monitor, LCD Monitor and LED monitor are the types of monitor.
e) What is printer? Write two examples.
Ans: Printer is an output device that is used to print the output on the paper.
The result on the paper is known as hard copy output.
There are three types of printer: Dot Matrix Printer, Inkjet printer, Laser
Printer
f. What is speaker?
Ans: Speaker is an output device which produce different sound from the
computer.
g. Which device gives soft copy output?
Ans: Monitor and speaker gives soft copy output.
h. Which device give hard copy output?
Ans: Printer gives hard copy output.
i. Which is the most popular printer today?
Ans: Laser printer is the most popular printer today.
Write any two different between CRT and LCD monitor.
|
CRT Monitor |
LCD Monitor |
|
1. It is heavier than LCD monitor |
1. It is lighter then CRT monitor. |
|
2. It consumes more electric power. |
2. It consumes less electric power. |
Five the name of the devices.
a) It gives the soft copy output.
Monitor
b) It gives hard copy output.
Printer
c) It gives output in the form of Sound. Speakers
d) It is the most popular printer today. Laser
printer
The correct way
of operating a computer
Q.4. Answer the following questions:
a) Write down the steps to start your computer.
Ans: Steps to start computer are as follows:
Step 1 : Switch on the main power supply button.
Step 2: Switch on the power button of the system unit and
monitor.
Step 3: Wait for some time and if username and password is
requested type it and press enter key.
Now your computer is ready for you.
b) Write down the steps to shut down your computer.
Ans: Steps to shutdown computer are as follows:
Step 1 : Save all your work and close all the opened
programs.
Step 2 : Click on the start button. Then start menu will
display.
Step 3 : Click the drop down button situated at the buttom
right of dialogue box.
Step 4: Select and click on the shut down option.
Step 5 : After shutting down your computer switch off all
power supply of your computer system.
c) Explain the correct ways of using mouse.
Ans: The correct ways of using mouse are as follows:
i) Always use the mouse by placing it on the mouse pad.
ii) Place your mouse at elbow level.
iii) Hold the mouse gently. Do not grip it tightly.
iv) Avoid bending your wrist up, down or to the sides.
v) Use a light touch when clicking a mouse button.
vi) Keep your fingers relaxed.
d) Explain the correct ways of using keyboard.
Ans: Correct ways of using keyboard are:
i) Place your keyboard at elbow level.
ii) center your keyboard in front of you.
iii) Type with your hands and wrists floating above the keyboard.
iv) Avoid resting your palms or wrists on any type of surface while typing.
v) Use a light touch and keep your wrists straight.
vi) Do not press the keys on the keyboard too hard.
e) Write down any four safety habits while working on the
computer.
Ans: Any four safety habits while working on the computer are:
1) Your eyes should not be too close to the monitor.
2) The monitor should be positioned slightly below eye level.
3. Rest your eyes by looking away from the screen frequently.
4. your feet should be flat on the floor.
f. What is computer software?
Ans: A group of programs that performs a particular
task is called software.
g. What is a computer system?
Ans: Different Hardware components and software together
form a computer system.
h. What happens when you start your computer?
Ans: When we start our computer the operating system starts
its processing to make the computer ready for you to work.
Concept of Operating System
Q.5. Answer the following questions.
a. What is an operating system?
Ans: An operating system is a special software that manage and controls all the
parts of a computer system.
b. Write any four examples of operating system.
Ans: Windows, DOS, LINUX and UNIX are the four examples of operating system.
c. What are the different versions of windows.
Ans: The different versions of windows are : Windows-95, Windows-98,
Windows-2000, Windows-XP, Windows-Vista, Windows-7, Windows-8, Windows-8.5 etc.
d. What is booting?
Ans: Booting is the process of starting computer.
e. What are the different parts of windows-7 desktop?
Ans: The different parts of windows-7 desktop are: Icons, start button, Quick
lunch, System date and time, task bar, Gadgets and desktop
f. What is desktop area?
g. Write any four default icon of desktop?
Typing with Tux Typing
Answer the following:
a. What is Tux Typing? write its use.
Ans: Tux Typing is a free and open source typing software created especially
for children.
b. How can we play a game in Tux Typing?
Ans: To play a game in Tux Typing follow these steps:
Step 1 : Start Tux Typing
Step 2 : Click on the game which you want to play
Step 3 : Select Level
Step 4 : Choose the area of your interest
Step 5 : Start playing.
c. What are the different types of games available in Tux Typing?
Ans: Different types of games available in Tux Typing are Fish Cascade and
Comet Zap.
d. What are lessons in Tux Typing?
Ans: The different lesson in Tux Typing are Easy, Medium and Hard
e. Why is Tux Typing called a high quality typing software?
Ans: Tux Typing called a high quality typing software because it is designed to
be fun and educational to improve speed of typists.
Word Processing Program : Word Pad
Answer the following questions:
a) What is word Processor?
Ans: Word processor is a computer program that you can use to create, edit,
view, format and print text documents.
b) What is word Pad?
Ans: Word Pad is a basic word processor program that comes with windows
operating system.
c) Write the different parts of Word Pad window?
Ans: The different parts of Word Pad window are: Quick Access Toolbar, Title
Bar, Ribbon, Rular, Text Area, Control Buttons, Status Bar, Zoom Control etc.
d) What are the different methods for selecting document?
Ans: The different methods for selecting text in the document are:
1. To select a word : Double click on particular word.
2. To select a paragraph : Triple click on any word in particular paragraph.
3. To select all the word in the document: press Ctrl+a button from the
keyboard.
e) What is difference between copying and moving text?
Ans: Copy text means to copy the text from one part of your document to another
part. Copy command doesn't remove the selected text from the original location.
Moving Text (Cut command )means moving text from one part of your document
another part. Cut command remove the selected text from the original location.
f) What is the use of undo command?
Ans: Undo command is used to cancel last action that you have done in the
document.
g) What do you mean by formatting document?
Ans: formatting means arranging the texts in the proper manner. For example:
Font style. Font color, size, alignment etc.
h) What is the shortcut key to save document?
Ans: Ctrl+s is the shortcut key to save document.
Coming Soon
Introduction to Logo Program
Class 4 Chapter 11 Introduction to logo program
a) What is MSWLOGO?
Ans : LOGO is the simplest programming language specially designed for
children. MSWLOGO is the latest version of LOGO for the use with Microsoft
windows.
b) Who developed LOGO Programming language?
Ans: LOGO Programming language is developed by Professor Seymour Papert and his
colleagues at ehe Massachusetts Institute USA.
c) Name any four parts of MSWLOGO.
Ans: Four parts of MSWLOGO are: Title bar, Menu bar, Graphics screen, Commander
window etc.
d) What is LOGO Turtle?
Ans: LOGO Turtle is the small triangular shaped object that follows the LOGO
commands and displays the related figure.
e) What is the extension of LOGO Program file.
Ans. Dot Lgo is the extension of LOGO Program file.
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