Computer book 3 layout final for ctp 2075

New

Gateway to
Computer Science

A Complete Text Book of Computer Science

Authors : Dinesh Adhikari, Dilendra Bhatta

Contributing Co-authors : Laxman Adhikari, Toyaram Giri
Arjun Poudel

Layout Design : Zeeta Computer Service Pvt. Ltd.

(Samin R. Dhungana) Ghantaghar,

Kathmandu, Nepal

Copyright © : Publisher

Edition : 2075

Publication : Shubharambha Publication Pvt. Ltd.
Kathmandu, Nepal

Preface Contents

Along with the evolution of human Unit
beings new thoughts, area of knowledge
and technology also developed together. 1. Introduction to Technology 1
Among the eruptions, ICT (Information
and Communication Technology) is 2. Learning the Computer 15
one which has unquestionably become
important part of human beings. A 3. Input and Output Devices 29
person is not better than a caged pigeon
if s/he is far from computer technology 4. Handling the parts of
in this century. New Gateway to
Computer Science Book-3 is a Computer 48
complete package which obviously
supports a lot to the students as this is 5.. Starting and Shutting down
one of the most useful Text Book, so
far available in the market. This book the computer 62
is completely prepared considering the
level of the students. This text has the 6. Working with Paint (part I) 72
various salient features like it focus on
child psychology, inclusion of comic’s 7. Working with Paint (part II) 83
cartoons, conversation based, focus
on pictorial descriptions,quiz section, 8. Working with Word pad 100
worksheets, etc.
Quiz Section 114
Comments and constructive suggestions
are highly welcomed from the readers My Worksheets 118
and professionals to update this text
book. Guidelines to the teachers 126

Suggest us:

[email protected]

Thank you.

Unit : 1

Introduction to
Technology

Note to Teacher

Bring some electronic devices like mobile, calculator,
laptop, etc. in the class and demonstrate them.

Use some cards and pictures that are related to technology
during teaching learning activities.

Make your students visit nearby places where technology
has been used and let them know the uses of technology.
(Like ATM Centre, Electricity office, Telecom Office etc.)

New Gateway to Computer Science Book - Three 1

Look at the given pictures carefully.

The above figures indicate
a variety of devices in which
there is use of technology. Because
of the technology, we are able to use
different products. The main creator
of technology is human. Humans use
their skills and knowledge to develop such
devices. Be sure that technology is not given
by the nature. These are the best creations of
human beings.

2 New Gateway to Computer Science Book - Three

Technology is the branch of knowledge that deals with the
creation and use of technical resources and their interrelation
with human life. We use technology to do various works in
our daily lives.

All the objects around us which
we use in our daily lives are the
products of different technologies.
Calculator, Mobiles, Computers,
cars, airplanes, etc. are the output
of technology, which are making
our life very easy and comfortable.
Only the knowledge of computer is
not sufficient to work everywhere
properly. A person should have
the knowledge of different
technologies.

Quick Learn

Humans use their skills and knowledge to develop the
devices.

Technology is not given by the nature.

Technology is the set of knowledge, skills, experience
and techniques to create machines.

Calculator, Mobiles, Computers, cars, airplanes, etc. are
the product of the technology.

New Gateway to Computer Science Book - Three 3

Advantages of Technology

We can communicate with anyone in the world
within a few seconds.

We can do our work very fast and easily.
We are getting different types of entertainment.
We are getting latest types of health, education and

other various services.
We can see a great revolution in the field of science

and engineering.

Disadvantages of Technology

The use of technology is decreasing the efficacy of
human.

The use of technology is creating unemployment
problem in the world.

The use of technology is expensive and difficult to
use, so everybody cannot effort it.

The use of technology is creating the issues of
privacy.

The use of technology is bringing a lot of social and
environmental problems.

4 New Gateway to Computer Science Book - Three

Oral Evaluation

Ask the given questions in the class to determine the
understanding level of students.
yy What is technology?
yy Who is the main creator of technology?
yy Tell any two advantages of technology.
yy Tell any two disadvantages of technology.
yy Name any four technological devices.

Application Areas of Information and Communication
Technology

People use computers in everyday life. Computers and other
electronic devices are becoming inexpensive gradually.
They are more powerful and easier tools to work.  Humans
are becoming dependant on technology even for simple
tasks. There are some application areas of Information and
Communication Technology(ICT).

1. Technology in Science and Engineering

The use of technology in science
and engineering is increasing day
by day. With the help of technology,
new creation and development is
possible.

New Gateway to Computer Science Book - Three 5

2. Technology in Business 

Nowadays technology is being
used in Business for the promotion
of their products. People are
preparing interesting types of
advertisements with the help
of technology so that they can
promote their business.

3. Technology in Education

The use of computer in education
field is also increasing day by day.
Teaching learning process is easier
because of the use of technology. A
teacher can demonstrate the topic
easily and students can easily
understand it. Nowadays, online
education is also possible because of technology.

4. Technology in Hospital &Medicine

Doctors can easily diagnose the disease of sick people
at hospital with the help of
technology. To keep the record
of doctors, patients,many
technologies are used. It is easy for
them to know the status of brain,
heart, kidney, vain, etc. with the
use of technology.

6 New Gateway to Computer Science Book - Three

5. Technology in Entertainment
Entertainment is essential for
every human being. With the
help of technology, people can
create interesting animations
and effects. Sound effects, video
effects, text effects, etc. are also
possible to apply with the help of
technology.

Quick Learn
Technology is used to do our work very fast and easily.
The use of technology is bringing a lot of social and

environmental problems.
Humans are becoming dependant on technology even

for simple tasks.
The use of technology in this modern age are :

»» Science and Engineering
»» Business 
»» Education
»» Hospital & Medicine
»» Entertainment

New Gateway to Computer Science Book - Three 7

Oral Evaluation

Ask the given questions in the class to determine the
understanding level of students.

yy Tell any four application areas of technology.
yy What is the role of technology in education?
yy What is the role of computer at hospital?
yy What is the use of technology for entertainment?

Word Meaning

indicate : point out; show

variety : the state of being different, variation

creator : maker; designer

devices : parts; components

skill : talent

experience : knowledge or skill gained

techniques : Skills; abilities ; idea s

fulfil : to carryout to completion

demand : to request for something

sufficient : more ; enough

communicate : exchange information

unemployment : Joblessness; workelessness

effort : energy ; power

inexpensive : not expensive ; low cost

demonstrate : show; display

8 New Gateway to Computer Science Book - Three

Let's Revise

áá With the help of technology, we are able to use
different products.

áá Technology is not given by the nature.

áá Technology is the branch of knowledge that deals
with the creation and use of technical resources and
their interrelation with human life.

áá A person should have the knowledge of different
technologies.

áá The uses of technology is decreasing the efficacy of
human beings.

áá Humans are becoming dependant on technology
even for simple tasks.

áá The use of technology in science and engineering is
increasing day by day.

áá With the help of technology, new creation and
development is possible.

áá Teaching learning process is easier because of the use
of technology.

áá Doctors can easily diagnose the disease of sick people
at hospital with the help of technology.

áá With the help of technology, people can create
interesting animations and effects.

New Gateway to Computer Science Book - Three 9

Evaluation Time

1. Name the following devices with the help of clues.

Robert Memory card Camera
Mobile Television Laptop

2. Fill in the blanks with suitable word.

a. With the help of ……………………, we are able to use
different products.

b. Technologies are not given by the ………………….
c. …………………… is the branch of knowledge.

10 New Gateway to Computer Science Book - Three

d. A person should have the knowledge of different
technologies.

e. The use of technology is …………………..the efficacy of
human.

f. Humans are becoming …………………. on technology
even for simple tasks.

g. Teaching learning process is easier because of the
use of …………………….

h. ……………..can easily diagnose the ……………. of sick
people at hospital with the help of technology.

3. State whether the given statements are True or
False.

a. Nowadays people depend on technology.

b. The term technology is derived from the
Chinese word.

c. Mobile and tablet are also related to
technology.

d. The uses of technology is decreasing the
efficacy of human beings.

New Gateway to Computer Science Book - Three 11

e. Technology is not necessary for
communication.

f. The use of technology is increasing
unemployment.

g. In education, technology is not necessary.
4. Answer the given questions:

a. What is technology?
.........................................................................................................................................................................

........................................................................................................................................................................

b. What is the full form of ICT?

..........................................................................................................................................................................

..........................................................................................................................................................................

c. Write any four advantages of technology.

................................................................................. ................................................................................

................................................................................. ................................................................................

12 New Gateway to Computer Science Book - Three

d. Write any four disadvantages of technology.

................................................................................. ................................................................................
................................................................................. ................................................................................

e. Write any four application areas of technology.

................................................................................. ................................................................................
................................................................................. ................................................................................

f. What is the role of technology in education?

.........................................................................................................................................................................

........................................................................................................................................................................

4. Write down the meaning of the given words.

a. Indicate : .....................................................................................

b. Devices : .....................................................................................

c. Techniques : .....................................................................................

d. Sufficient : .....................................................................................

New Gateway to Computer Science Book - Three 13

e. Communicate : .....................................................................................

f. Unemployment : .....................................................................................

g. Effort : .....................................................................................

5. Identify and highlight the following words from the
given table.

Laptop Tablet Mobile Memory Pen Drive

W R C P WWM A
MY L A P TOP
YEBREBBC
B YMRN C I B
GNGODB LD
HGHT RHE F
YHYC I YRG
HOR F V T BH
TABLETCK

Project Work

Use a chart paper and paste any 10 pictures of
technological devices.

14 New Gateway to Computer Science Book - Three

Unit : 2
Learning The Computer

Note to Teacher

Visit computer lab and let the students know how the
computer parts are attached with each other.

Prepare a chart paper where the different figures of
computers are pasted.

Make your students visit nearby places where computers
are used (Like Hospitals, Bank, Department store, etc.)

New Gateway to Computer Science Book - Three 15

Introduction

Look at the given figures carefully

A computer is an electronic device. It cannot work without
electricity. It is a manmade device. It helps to do a lot of
calculations. Computer is a device that transforms data into
meaningful information. A computer can:
accept the data,
process data as desired,
display the result after processing and,
store the data.
We can say that a computer is an electronic device which
accepts input (data), processes it and displays meaningful
output which is called result. The main job of computer is
to run programs. Programs are developed by the computer
programmers. A person who is mainly responsible to develop
a program is called computer programmer. A computer
programmer writes a program and saves it on a storage device

16 New Gateway to Computer Science Book - Three

like a pen drive, hard disk, Compact Disk (CD), Digital Video
Disk (DVD) or other storage media.

Advantages of Computer

The following are the advantages of the computer:
It is a very fast and accurate device.
It can process large amount of data at a very high

speed.
It can perform millions of calculations in a few

seconds.
It can store large amount of data.
It can be used in various fields.

Disadvantage of Computer

The following are the disadvantages of the computer:
It does not have true intelligence.
It cannot give any decision itself.
It has no feelings or emotions.
It is expensive machine so everyone cannot afford it.
It requires trained person to handle.
It is useless without electricity.

New Gateway to Computer Science Book - Three 17

Quick Learn
A computer is an electronic device.
A computer cannot work without electricity.
A computer helps to do a lot of calculations.
A computer is a device that transforms data into

meaningful information.
The main job of a computer is to run programs.
Programs are developed by the computer programmers.
A person who is mainly responsible to develop a program

is called computer programmer.
A computer can perform millions of calculations in a

few seconds.
A computer cannot give any decision itself.

Components of computer

A computer has three main units to work. They are input,
process and output.

Input unit:
This unit helps to give data and
instructions to the computer system.
The keyboard and mouse of the
computer are the most commonly used
input devices.

18 New Gateway to Computer Science Book - Three

Process Unit:
This unit is mainly responsible for data processing
activities. Without processing unit, a computer is
like a dead body of human.

Output Unit:
This unit is used to display the result
after processing. The output is also called
information which is meaningful.

Characteristics of computer

Speed:
The processing speed of computer is very high. The computer
can process millions of instructions in a few second. Very
high speed computers are available these days. The speed
measurement units are Milliseconds, Microseconds,
Nanoseconds, Picoseconds and Femtoseconds.

Storage Capacity:
A computer can store large amount of information on the basis
of its storage capacity. The storage capacity is measured on
kilobytes, megabytes, gigabytes, terabytes, etc. Nowadays
the hard disk of one terabyte is common. 

Versatility:
A computer has a multitasking capacity. A computer can be
used everywhere. It can be used for various purposes, so it is
a versatile machine.

New Gateway to Computer Science Book - Three 19

Reliability:

The computer is a reliable electronic multiprocessing
machine. It processes data with high accuracy without any
mistake.

Artificial Intelligence:

The fifth generation computer which recognizes voice is based
on artificial intelligence. Artificial Intelligence is being used
in gaming software and robotics for many years, but operating
system based on Artificial Intelligence is not developed yet.
The Artificial Intelligence can recognize not only voice, but
also read the mood of the users. It is able to give suggestions
and decisions to the users.

Quick Learn

A computer has three main units to work; they are input,
process and output.

Input unit helps to give data and instructions to the
computer system.

The keyboard and mouse of the computer are the most
commonly used input devices.

Process Unit is mainly responsible for data processing
activities.

Speed, storage capacity, versatility and reliability are
the special charaterstics of a computer.

20 New Gateway to Computer Science Book - Three

Oral Evaluation

Ask the given questions in the class to determine the
understanding level of students.
yy What is a computer?
yy What does a computer do?
yy Tellanytwoadvantages and disadvantage of a computer.
yy Tell the components of a computer.
yy Name any four technological devices.
yy Tell any four caracteristics of a computer

Word Meaning

meaningful : purposeful; full of meaning

accurate : error less / correct

programmer : a person who writes a computer program

instructions : commands

versatile : having or capable of doing
many works

multitasking : to perform two or more tasks at the
same time

artificial : mademade

software : a computer program

New Gateway to Computer Science Book - Three 21

Let's Revise

áá A computer is an electronic device.
áá A computer cannot work without electricity.
áá A computer is a device that transforms data into

meaningful information.
áá A person who is mainly responsible to develop a

program is called computer programmer.
áá A computer is a very fast and accurate device.
áá A computer can process large amount of data at a

very high speed.
áá A computer doesn't have its own intelligence.
áá A computer cannot give any decision itself.
áá The input unit helps to give data and instructions to

the computer system.
áá The process unit is mainly responsible for data

processing activities.
áá The Output unit is used to display the result after

processing.
áá The processing speed of a computer is very high.
áá A computer has a multitasking capacity.
áá The fifth generation computer which recognizes voice

is based on artificial intelligence.

22 New Gateway to Computer Science Book - Three

Evaluation Time

1. Circle the best answer.

a. A computer is an …………………….device.

i. electronic ii. input iii. machine

b. A computer cannot work without ………….
i. machine ii. electricity iii. ink

c. Who is called a computer programmer?
i. A person who makes the computer program.

ii. A person who uses the computer.

iii. A person who makes the computer.

d. Which of the following is speed measurement unit of
a computer?

i. Nanosecond ii. Kilobyte iii. Megabyte

e. Which of the following is storage measurement unit
of a computer?

i. Nanosecond ii. Microsecond iii. Gigabyte

New Gateway to Computer Science Book - Three 23

2. Fill in the blanks with suitable words.

a. …………………… is a device that transforms data into
meaningful information.

b. A computer is an ……………. device which accepts
input (data), processes it and displays ……………
output.

c. A person who is mainly responsible to develop a
………………. is called computer programmer.

d. A computer can process large amount of data at a
very high …………. .

e. A storage device can store ………………. amount of
data.

f. A computer requires ………………… person to handle.

g. The …………………is used to display the result after
processing.

h. The ............... is also called as information which is
meaningful.

i. A computer has a capacity of operating multi task
which is known as ………………………

24 New Gateway to Computer Science Book - Three

3. Answer the given questions:
a. What is a computer?

........................................................................................................................................
........................................................................................................................................

b. Who is called a computer programmer?

........................................................................................................................................
........................................................................................................................................

c. Write any three advantages of a computer.

........................................................................................................................................
........................................................................................................................................
........................................................................................................................................

d. Write any four disadvantages of a computer.

........................................................................................................................................
........................................................................................................................................
........................................................................................................................................
........................................................................................................................................

New Gateway to Computer Science Book - Three 25

e. Name any three units of a computer.

........................................................................................................................................
........................................................................................................................................
........................................................................................................................................

f. What is the use of an input unit?

........................................................................................................................................
........................................................................................................................................

g. Write any four characteristics of a computer.

........................................................................................................................................
.......................................................................................................................................
........................................................................................................................................
........................................................................................................................................

h. What are the speed measurement units of a computer?

........................................................................................................................................
........................................................................................................................................

26 New Gateway to Computer Science Book - Three

i. Write down the storage measurement units of a
computer.

........................................................................................................................................

........................................................................................................................................

4. Write down the meaning of the given words.

a. meaningful : ...........................................................................

b. accurate : ...........................................................................

c. versatile : ...........................................................................

d. multitask : ...........................................................................

e. artificial : ...........................................................................

5. Match the followings.

Mutlitasking Uselless or meaningless things

Data Collection of programme

Information Capable of doing verious task

Software Meaningful and useful

New Gateway to Computer Science Book - Three 27

5. Identify and highlight the following words from the
given table.
Input Storage Process Speed Accurate Artificial
A Z X C V BNM
RPROCE S S
T I RYATSP
I GNUCHT E
FHS PCFOE
I I TUUHRD
C J YHRT AU
I KUTAGG I
ALHE THEB
LMG R E I R T

Project Work
Use a chart paper and paste the pictures of any 5 parts
of the computer and submit it to your teacher.

28 New Gateway to Computer Science Book - Three

Unit : 3

Input and Output
devices

Note to Teacher

Visit the computer lab and let the students know how
mouse, keyboard, monitor, printer and speaker are
connected with the computer system.

Prepare a chart paper including the different figures of
input and output hardware and demonstrate it in the class.

New Gateway to Computer Science Book - Three 29

Introduction

Look at the given figures carefully

The above devices are input
and output devices of a computer
system. Simply, input is the way of
entering the data to the computer
to perform the tasks. The input is
possible with the help of input devices
only. Here we are going to learn about the input
and output devices.

30 New Gateway to Computer Science Book - Three

Input Devices:

Input devices are used to send data and instructions to the
computer. An input device is also a hardware device that sends
data to a computer. Without sending data, a computer can do
nothing. The input devices are also called input hardware.
There are two popular input devices; they are mouse and
keyboard.

Mouse:

Mouse is a popular input pointing
device. A mouse is an electro-
mechanical, handheld device.
It is used as a pointer. It can
perform functions like selecting
menu commands, moving icons,
resizing windows,starting and
choosing programs, etc. A mouse is connected to a computer
system using a cable or a wireless connection.
Functions of a mouse

¬¬ Move the mouse cursor : The primary function of a
mouse is to move the mouse cursor on the screen.

¬¬ Open a program :You can click or double click an
object that opens the document .

¬¬ Select : A mouse also allows you to select a text or a file
or highlight it.

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¬¬ Drag-and-drop : Once something is selected, it can
also be moved using the drag-and-drop method.

¬¬ Hover : Moving the mouse cursor over an object.
¬¬ Scroll  : When working with a long document or viewing

a long web page, you may need to scroll up or down
which can be done using the mouse wheel or clicking
and dragging the scroll bar.

Quick Learn

Input is the way of entering the data to computer to
perform the tasks.

The input is possible with the help of input devices only.

Input devices are used to give data and instructions to
the computer.

An input device is also a hardware device that sends data
to a computer.

There are two popular input devices, they are mouse
and keyboard.

A mouse is a popular input pointing device.

A mouse is an electro-mechanical, handheld device.

A mouse is connected to a computer system using a cable
or a wireless connection.

32 New Gateway to Computer Science Book - Three

Holding way of the mouse
To hold the mouse, use the following tips.

Keep your thumb on the side of the mouse and your
index finger on the left button and middle finger on the
right button.

Keep the mouse at the same height as the keyboard.   

Use a programmable mouse to distribute the work
between your thumb and fingers.   

Keep your mouse balls clean to minimize the effort.   

Take frequent breaks in using the mouse intensively, at
least 10 minutes every hour.   

Keep your hands warm.   

Keep the mouse close to you. The arms should be relaxed
at your side with the elbow at a right angle and the wrist
straight.

Keyboard:

It is a commonly used input
device. All computer users must
have a keyboard. It is a typing
device. The keyboard is the piece
of computer hardware used
to input text, characters, and

New Gateway to Computer Science Book - Three 33

other commands into a computer. A keyboard is an
external peripheral device in a desktop system (it is placed
outside the main computer housing).  A keyboard is connected
to a computer system using a cable or a wireless connection.
Understanding the keys of a keyboard

Escape Key

The Escape (Esc) key allows you to stop a function
or action. For example, if a computer is taking a
long time to load, you can press the Escape key to
stop loading it.

Function Keys

The function keys are labelled from F1 to F12. Some programs
use these keys as shortcuts for common tasks.

Print Screen, Scroll Lock, Pause/Break

The Print Screen, Scroll Lock, and Pause/
Break keys are located at the top-right
corner of the keyboard. The Print Screen
key takes a picture of your screen (screenshot) that you can
edit or save using a graphics program.

Backspace Key

The Backspace key erases the character
to the left of the cursor.

34 New Gateway to Computer Science Book - Three

Insert key
This key switches between insert mode (which inserts new
text without deleting anything) and over type mode (which
deletes text after the cursor as you type).
Delete key
This erases the character to the
right of the cursor.
Home and End
These keys move the cursor to the beginning or end of the
current line. 
Page Up and Page Down
These keys help to scroll a document up or down of the screen.
Enter Key
This key is used to start a new line in word
processing programs.
Arrow Keys
The arrow keys are used for many different
purposes, including moving the cursor,
scrolling a document, and even controlling
a game.
Numeric Keypad
The numeric keypad resembles a calculator
keypad. Many users find that it is easier to
type numbers using this keypad.

New Gateway to Computer Science Book - Three 35

Ctrl, Alt, and Shift

The  Control  (Ctrl),  Alternate  (Alt),
and Shift keys are designed to work in combination with other
keys. Typically, you need to hold down Ctrl, Alt, or Shift and
then type another key to perform a specific task.

Spacebar Key

This is the longest key of the
keyboard. It is used to put the space between the word(s). It
is located at the button of the keyboard.

Quick Learn

A keyboard is a commonly used input device.
A keyboard is the piece of computer hardware used to

input text, characters, and other commands.
A keyboard is an external peripheral device in a desktop

system.
A keyboard is connected to a computer system using a

cable or a wireless connection.
The function keys are labelled from F1 to F12.
The Backspace key erases the character to the left of the

cursor.
Home and End keys move the cursor to the beginning or

end of the current line. 
A spacebar Key is used to put the space between the

word(s).

36 New Gateway to Computer Science Book - Three

Oral Evaluation

Ask the given questions in the class to determine the
understanding level of students.
yy What is an input device?
yy Tell the names of any three input devices.
yy Tell any three functions of a mouse.
yy What is a keyboard?
yy Name any five keys of a keyboard.
yy What is a spacebar key?

Output Devices:

Output devices are used to display the result after processing.
The output displayed by the computer is always meaningful.
When a user inputs the data with the help of input devices,
it goes for processing and after processing, the result will be
displayed on the output devices.

Some common types of output devices are Monitor, Printer,
Speaker, etc. Among the various output devices, monitor
is the most essential output device of a computer system
without which we cannot see any result.

New Gateway to Computer Science Book - Three 37

Monitor

The monitor is a computer
hardware that displays the result on
the screen. The output displayed by
monitor is called soft copy output. A
monitor looks similar to televisions
but it displays information in a higher
resolution. A monitor is also called as a screen, display, video
display, video display terminal, video display unit, or video
screen.

Printer

A printer is an output device that
produces text and graphics on paper.
Printed information is called as hard
copy output. The printing speed of a
printer is measured in ppm (pages per
minute). The resolution of a printer is
measured in dpi (dots per inch).

Speaker

Speakers are popular output
devices used in a computer systems.
With the help of a speaker, we can
listen to music and songs from the
computer system. A speaker is also a
computer hardware which connects
a computer system to generate sound.

38 New Gateway to Computer Science Book - Three

Quick Learn

The output devices are used to display the result after
processing.

The output displayed by the computer is always
meaningful.

Monitor is the most essential output device in a computer
system.

A monitor is also called as a screen, display or video
display unit.

Printed information is called as hard copy output.
The printing speed of a printer is measured in ppm

(pages per minute).
The resolution of a printer is measured in dpi (dots per

inch).
With the help of a speaker, we can listen to music and

songs from the computer system.

Oral Evaluation

Ask the given questions in the class to determine the
understanding level of students.

yy Tell about an output device.
yy Name any three output devices.
yy What is the use of a monitor?
yy What is the use of a printer?
yy Why do we use a speaker?

New Gateway to Computer Science Book - Three 39

Word Meaning

indicate : point out; show.

input : the way of entering a data

data : raw facts and figures which have no
meaning

wireless : technology without cable

drag  : to move with effort.

peripheral : a device or unit that operates separately
from the CPU but is connected to it.

hardware  : the physical parts of a computer

soft copy : the changeable output

resolution : sharpness on the image or text

Practical Time

Visit your computer lab and do the given activities.
Turn ON and OFF the monitor.
Turn ON and OFF the printer.
Observe how the speaker is connected to the PC.
Observe the cable connection of keyboard and mouse.

40 New Gateway to Computer Science Book - Three

Let's Revise

áá Input devices are used to give data and instructions to
the computer.

áá A mouse is an electro-mechanical, handheld device.
áá The primary function of a mouse is to move the cursor on

the screen.
áá A keyboard is the piece of computer hardware used to input

text, characters, and other commands into a computer.
áá The Escape (Esc) key allows you to stop a function or

action.
áá The function keys are labelled from F1 to F12.
áá The delete key erases the character to the right of the cursor
áá The enter Key is used to start a new line in word processing

programs.
áá The spacebar Key is the longest key of the keyboard.
áá The spacebar key is used to put the space between the word(s).
áá The output devices are used to display the result after

processing.
áá Some common types of output devices are Monitor,

Printer, and Speaker etc.
áá The monitor is a computer hardware that displays the

result on the screen.
áá The output displayed by monitor is called soft copy output.
áá A printer is an output device that produces text and

graphics on paper.
áá Speakersreceiveanaudio input fromthecomputer's sound

card and produce audio output in the form of sound
waves.

New Gateway to Computer Science Book - Three 41

Evaluation Time

1. Identify and highlight the following words from the
given table.

Function Home End Enter
Delete Insert Arrow Space

FRAGEHYUB

UR R C NG AN S
NHR P T P I P P
C AODE YNUA
T J WM R K S J C
I FGDE L ETE
O F J ONHR YU
NH I Z DMT T Y

2. Circle the best answer.

a. Which of the following is an input hardware?

i. Mouse ii. Hard Disk iii. Monitor

b. Which of the following is an input pointing device?

i. Keyboard ii. Mouse iii. CPU

c. Which of the following is an external peripheral device?

i. Keyboard ii. Mouse iii. Both

42 New Gateway to Computer Science Book - Three

d. Which key allows you to stop a function or action of
a computer?

i. ESC key ii. DEL key iii. Alt Key

e. Which key is used to erase the character to the right
of the cursor?

i. DELETE ii. Function iii. Home

f. Which is the longest key of the keyboard?
i. Enter ii. Spacebar iii. End

g. Which key is used to type the text from the new line?

i. ENTER ii. Home iii. ALT

h. Which of the following is the function of a mouse?

i. Select ii. Copy iii. paste

i. Which of the following is an output device?

i. Speaker ii. Monitor iii. CPU

j. Which of the following is a hard copy output?

i. Monitor ii. Printer iii. Mouse.

k. Which of the following is a soft copy output?

i. Monitor ii. Printer iii. Speaker.

New Gateway to Computer Science Book - Three 43

3. Fill in the blanks with suitable words.

a. ……………….. are used to give data and instructions to
the computer.

b. The input devices are also called ..........……………
hardware.

c. A mouse is an electro-mechanical, ………………………….
device.

d. A mouse is connected to a computer system using a
…………… or a wireless connection.

e. The keyboard is the piece of computer ……………… that
isusedtoinputtext,characters,andother…………………
into a computer.

f. The function keys are labelled from F1 to …………..
g. The Backspace key ……………. the character to the left

of the cursor.
h. …………………… key erases the character to the right

of the cursor.
i. ……………………key is used to start a new line in word

processing programs.
j. ……………………..is the longest key of the keyboard.
k. Speaker is an …………………….device.

44 New Gateway to Computer Science Book - Three

4. Match the followings Monitor
Hard copy output

Soft copy output Printer

Input device Typing device

keyboard Mouse
5. Answer the given questions:

a. What is input?

........................................................................................................................................

........................................................................................................................................

b. What is an input hardware?

........................................................................................................................................

........................................................................................................................................

c. Name any two input devices.

............................................................ ................................................................

New Gateway to Computer Science Book - Three 45

d. What is a mouse?

........................................................................................................................................

........................................................................................................................................

e. Write any four functions of mouse.

............................................................ ................................................................

............................................................ ................................................................

f. What is a keyboard?

........................................................................................................................................

........................................................................................................................................

g. Name any six keys of a keyboard.

...................................... ........................................... .....................................

...................................... ........................................... .....................................

h. What is the use of the backspace key?

........................................................................................................................................

........................................................................................................................................

i. Which is the longest key of the keyboard?

........................................................................................................................................

46 New Gateway to Computer Science Book - Three

j. What are the functions of the arrow keys?

........................................................................................................................................

........................................................................................................................................

k. Name any three output devices.

...................................... ........................................... .....................................

l. What is output device?

........................................................................................................................................

........................................................................................................................................

6. Write down the meaning of the given words.

a. input : ..............................................................................................

b. wireless : ..............................................................................................

c. peripheral : ..............................................................................................

d. hardware  : ..............................................................................................

e. resolution : ..............................................................................................

Project Work

Use a chart paper and paste any 5 varieties of mouse
and keyboard then submit it to your teacher.

New Gateway to Computer Science Book - Three 47

Unit : 4

Handling the parts
of a computer

Note to Teacher

Ask the students to do the given conversation in the class.
Visit the computer lab and demonstrate students how

keyboard and mouse are used properly.
Explain some good and bad habits while working at the

computer lab.

48 New Gateway to Computer Science Book - Three