Computer 1

Shubharambha's
NEW

Gateway to
Computer Science

A Complete Text Book of Computer Science

Author
Dinesh Adhikari

Co-authors

Shekhar Poudel
Elisha K.C.
Toyaram Giri

Shubharambha Publication Pvt. Ltd.

Kathmandu, Nepal

Published by:

Shubharambha Publication Pvt. Ltd.

Kathmandu, Nepal
URL: www.shubharambhapublication.com
E-mail: [email protected]

www.facebook.com/shubharambhapublication

New Gateway to Computer Science Book-1

Author : Dinesh Adhikari

Co-author : Shekhar Poudel ,Elisha K.C., Toyaram Giri

Layout Design : Zeeta Computer Service Pvt. Ltd.

Cover Design : Ram Malakar
Dinesh Adhikari
Copyright © : First 2075, Second 2076, Third 2077
Revised 2078
Edition :

© : Publisher

No part of this book may be reproduced or transmitted by means (electronic, photocopying,
recording or otherwise) without prior written permission from the publisher. Any breach of this
condition will entail legal action and prosecution.

Printed in Nepal

Preface

Along with the evolution of human beings, new thoughts, area of knowledge
and technology also developed together. Among the eruptions, ICT
(Information and Communication Technology) is one which has unquestionably
become an important part of human beings. A person is not better than
a caged pigeon if s/he is far from computer technology in this century.
New Gateway to Computer Science Book-1 is a complete package
which obviously supports a lot to the students as this is one of the most
useful Textbook, so far available in the market. This book is completely
prepared considering the level of the students. There are various salient
features like it focus on child psychology, the inclusion of comic’s
cartoons, conversation-based, focus on pictorial descriptions, quiz section,
worksheets, etc.

I am thankful to Shubharambha Publication Pvt. Ltd. to for their
encouragement, co-operation and help in preparing this book.

At last I would like to assure all the concerned teachers, students
and readers that constructive suggestions and feedbacks shall be
tremendously appreciated and incorporated in the upcoming edition.
constructive suggestions and feedbacks, if any, can be mailed at
[email protected]

The Author

Guidelines to the teachers

Before starting the unit/lesson, teachers are required to go
through the 'Note to the teacher' and to follow the instructions
given.

Quiz time is given in each chapter to determine the understanding
level of the students. Teachers are required to ask the oral
questions to the students individually and mention the score in
the space provided.

Activity time is given to involve the students as their refreshment
work.

Evaluation Time is given as the exercise in each unit/lesson. It is
mandatory to write the answer to all the students. They can use
their own book to write the answer.

Conversation-based learning is one of the most important features
of this textbook. You are required to encourage the students to do
the conversation with role play

Practical time is given in some units as required. Computer
teachers are required to take the students to the computer lab
for practical classes.

Project work is given in each lesson. Teachers are required to sign
on each project work page and keep the records of it.

Quiz Section with answer key is given in this textbook, which is
believed to be helpful to increase the efficiency of the students.

My worksheets are the other features of this textbook. Teachers
are required to encourage the students to do worksheets as their
project works and keep the record of each student. They can
create similar types of other worksheets as required.

Thanking you !

Contents 6
7
Safety lab rules 8
Good sitting posture
Risk and precaution in a computer lab 9
Unit 23
1. Electrical Devices 41
2. About a Computer 55
3. Parts of Computer 69
4. Understanding Keyboard 82
5. Storage Devices 92
6. Starting a Computer 101
7. Working with Calculator 115
8. Paint in Window 8 120

Quiz Section
My Worksheets

Safety Lab rules

1. No food and drink.

2. Do not touch cables.

3. Respect your teacher and classmates.

4. Ask before printing the documents.

5. Keep the computer lab clean.

6. Do not use the computer and internet
without permission.

7. Do not make change or delete files
on the computer.

8. Do not run and jump in the lab.

9. Enter and Exit Quietly.

6 New Gateway to Computer Science Book - One

Good sitting posture

1. Always sit-up straight.
2. Maintain proper eyes level with the monitor.
3. Shoulder and arms relaxed.
4. Feel your back supported.

New Gateway to Computer Science Book - One 7

Risk and Precaution in a computer lab

Risk

1. Damaged electrical sockets and wires.
2. Overloaded electrical sockets.
3. Trailing wires .
4. Wrong sitting posture.
5. Food or liquids near computer.
6. Wrong with glare or reflections.

Precaution

1. Always sit with good posture.
2. Do not play, run and jump in computer lab.
3. Do not touch computer parts with wet hands.
4. Do not touch electrical sockets.
5. Do not hit keys too hardly.
6. Press gently mouse button.

8 New Gateway to Computer Science Book - One

Unit 1 Electrical
Unit : 1
Devices

Note to Teacher
Discuss about some electrical devices and
non-electrical things in class.
Tell students to draw some pictures of
electrical devices in their copies.
Ask some oral questions before starting
the lesson as given below.
» Do you have a mobile and a television at
home?
» Have you seen a fan and a rice cooker
at home?
» Have you seen the iron?
» Does electrical device need electricity
to work?

New Gateway to Computer Science Book - One 9

Look at the given pictures carefully.

Washing machine Fan Heater

Rice Cooker Mixture Refrigerator

Television Vacuum cleaner Computer

Electric Jug Iron Oven

10 New Gateway to Computer Science Book - One

Let's Read:
The above mentioned pictures need
electricity to work. They are electrical
devices. You might have seen them at
your home. Let’s talk something about
the electrical devices.
• All electrical devices are the man
made devices.
• Electrical devices are not developed
by the nature.
• Electrical devices need electricity to
work.
• Source of power is required for all
the electrical devices.

New Gateway to Computer Science Book - One 11

Activity Identify the name of given pictures.
Time

12 New Gateway to Computer Science Book - One

Activity Re-arrange the given jumbled letters.
Time

afn
Mtxieru
Tilevesino
Cumpoert
ehtera
Vcamuu
Ionr
vone

New Gateway to Computer Science Book - One 13

Look at the given pictures carefully.

Stappler Chair

Pressure cooker Table

Bed Book

14 New Gateway to Computer Science Book - One

Does the above things use electricity?

Let's Read:
The above pictures are not
electrical devices. They do not
need electricity. All creations of
nature are non electrical things.
All man-made things also do not
need electricity to work.

a. Is iron an electronic device?

b. Do computers need electricity to
work?

c. Is a table an electrical thing?

d. Is a television an electrical Score

device?

e. What is the source of the power ..................
for electric device?
5

New Gateway to Computer Science Book - One 15

Activity
Time

What do you want to do ?
I want to play video game

watch television.

listen to music.

make a phone call.

wash my clothes

cook some food.

16 New Gateway to Computer Science Book - One

Evaluation Time

1. Write E for electrical things and NE for non
electrical things.

New Gateway to Computer Science Book - One 17

2. Write Yes or No for the following questions.
a. Is an iron an electrical device?

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

b. Is a sofa an electronic thing?

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

c. Does a fan need electricity to work?

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

d. Is your bed an electrical thing?

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

e. Do you have television at home?

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

f. Is a television an electrical device?

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

g. Name any two electrical devices.

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

18 New Gateway to Computer Science Book - One

3. Circle the name of electrical devices only.

a. Fan b. Heater c. Radio

d. Mobile e. Iron f. Mixture

4. Name the following electrical things.

5. List out the name of any six items/objects of
each that need electricity to work and do not

need electricity to work.

Things that need electricity:

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

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

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

New Gateway to Computer Science Book - One 19

Things that do not need electricity:

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

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

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

6. Match the following.
Computer

Television

Iron

Fan

Heater

20 New Gateway to Computer Science Book - One

7. Paste the pictures of any four electrical
devices with their name.

New Gateway to Computer Science Book - One 21

Project Work

Make a list of any five electrical and
non-electrical things that are at your home.

Electrical Non-electrical
things things

Teacher's Signature

22 New Gateway to Computer Science Book - One

Unit 2 About a
Computer

Note to Teacher
Let the students do the conversation
in class.
Print some figures of computer parts
and demonstrate them in class.
Take the students to computer lab
and ask them to identify the mouse,
keyboard, monitor and CPU.

New Gateway to Computer Science Book - One 23

Observe the given pictures carefully.

Desktop computer Laptop

Smart watch Smart phone

Tablet
The above pictures are the types of computing
devices.

24 New Gateway to Computer Science Book - One

Observe the given pictures carefully.

System unit Monitor
Keyboard Mouse

Speakers Printer

The above pictures are the parts of desktop
computer.

New Gateway to Computer Science Book - One 25

Activity Fill the crossword with the help of
Time the pictures and letters given below.

S

Se

Ky o r

k

t

r

mu e

u

Pi tr

Mn i
t

26 New Gateway to Computer Science Book - One

Let's Read:
Here is a conversation between father and
daughter about the computer. Let's practise the
conversation.

Have you seen a
computer, my little baby?

Yes! I have seen it at
my brother’s room
and at school too.

Do you know papa? I do not know
There are a lot of more about them.

computers at my school.

Oh! Baby, do not worry! I
will tell you about it.

New Gateway to Computer Science Book - One 27

Really! I am too much
excited papa.

Have you seen the given
things?

Sure papa! I have seen them. My
teacher has also already told me
about them in my previous unit.

Oh, good! Now, I will tell
you more about it.

28 New Gateway to Computer Science Book - One

Look at the given pictures with their names.

Radio Calculator Mobile

Tablet Rice cooker Television

They all need electricity to
work. Similarly, the computer
also needs electricity to work.
So, the computer is called an
electronic machine.

A computer is also called

a calculating device. We can use computers for

various types of calculations. I am also using a
computer at my office for official work.

New Gateway to Computer Science Book - One 29

Oh! Papa, have you got a computer
at your office? How did it work? I
want to know about it.

Yes, I have. I am going to tell
you about how it works right
now.

Human has various physical organs to see, listen,
speak and think. In the same way a computer also
has its various parts to work.
The given pictures are the physical components of
a computer system.

Mouse Keyboard Monitor System unit
All the above parts of computer need to work
together to perform task.

30 New Gateway to Computer Science Book - One

My little girl, see the working
principle of the computer below.

System
Unit

Output
devices

Storage Input
devices devices

Input – Process – Output and Storage

The working principle of a computer is always

Input – Process – Output and Storage. It means you
have to give a command to the computer at first.

After that, it goes for processing. Finally, it displays

the result. We can store the result for further use.

Papa! It is an interesting. Really
computer is an amazing device.
Thank yo so much. Now, I will tell
these things to all my friends in class.

New Gateway to Computer Science Book - One 31

a. Is a computer a calculating Score

device? ..................
b. What is the full form of CPU?
6

c. What is the working principle of a
computer?

d. Who uses a computer at office for
official work, Father or Daughter?

e. Do we need to give a command to the
computer?

f. Tell the name of the given pictures.

32 New Gateway to Computer Science Book - One

Activity Identifying the parts of computer
Time system.

Tick the correct word from each picture.

Printer Mouse
Monitor Speakers

Keyboard Speakers
System unit Mouse

Keyboard Speakers
Monitor Keyboard

New Gateway to Computer Science Book - One 33

Activity Choose the word that best describes
Time the picture and write the word in the

blanks.

scanner system unit monitor
mouse digital camera printer
keyboard trackball speakers

1. 2. 3.

4. 5. 6.

7. 8. 9.

34 New Gateway to Computer Science Book - One

Activity Fill in the blanks with the suitable
Time letters.

M ...........................
M ...........................
T ...........................

S ...........................
P ...........................
D ...........................
H ...........................
K ...........................

New Gateway to Computer Science Book - One 35

Evaluation Time

1. Write True or False for the following
statements.

a. Mobile and tablets are electronic devices.

b. Fan and calculator are not electronic
devices.

c. Eyes and ears are the parts of a
computer.

d. The parts of a computer are its physical
components.

e. The storage – input - process is the working
principle of a computer.

f. Monitor is a physical component of a
computer.

36 New Gateway to Computer Science Book - One

2. Fill in the blanks with the correct word.

a. ......................... need electricity to work.
[Computers/Pressure cooker]

b. A computer is called a/an .........................
machine. [electronic / non-electronic]

c. A computer is also called a .........................

device. [manual / calculating]

d. Mouse and ............................ are the input
hardware of computer.
[monitor/ keyboard]

e. The working principle of a computer is

always Input–......................... Output and

Storage. [data/process]

3. Who said the following statements? Father
or Daughter? Write.

a. Have you seen a computer, little baby?

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

New Gateway to Computer Science Book - One 37

b. Oh baby, do not worry! I will tell you about
it.

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

c. Really! I am too much excited, papa.

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

d. Sure papa! I have seen it. My teacher has
already told me about them in my previous
unit.

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

e. Yes, I have. I am going to tell you how they
work right now.

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

f. Human has various physical organs to see,
listen, speak and think.

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

38 New Gateway to Computer Science Book - One

4. Answer the given questions.
a. What do computers need to work?

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

b. Why are the computers called calculating
devices?

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

c. Name any two parts of a computer.

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

d. What is the working principle of the
computer?

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

e. Write down the full form of CPU.

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

New Gateway to Computer Science Book - One 39

Project Work

Ask your father and write the name of
four electrical devices that he uses at his
office.

What do you use : (select from the given
options)
keyboard, mouse, television, joystick, speaker
to listen to music?
to type the letters?
to play the games?
to watch news/movies?
to draw on the screen?

Teacher's Signature

40 New Gateway to Computer Science Book - One

Unit 3 Parts of
Computer

Note to Teacher
Make the students visit the computer
lab.
Let them touch and identify the parts
of a computer.
Prepare a chart paper with computer
parts and demonstrate it in class.

New Gateway to Computer Science Book - One 41

Look at the given pictures carefully.

Monitor Keyboard Mouse

Printer Computer system System unit

Headphone Microphone Speaker

42 New Gateway to Computer Science Book - One

Activity Colour the given pictures carefully.

Time

New Gateway to Computer Science Book - One 43

Let's Read:
A computer does nothing itself. It
needs some physical parts to work.
It also needs software to work.
Hardware are the physical parts
of the computer. Software are the
computer programs.
A computer is an electronic device.
It processes the raw data. It always
displays meaningful information.

Monitor

It is a computer
hardware.

It looks like a television
screen.

44 New Gateway to Computer Science Book - One

It is an output device of the computer system.
Without monitor, we cannot see anything on

the screen.
The output displayed by monitor is changeable.
It is also called the soft copy output device.

Keyboard

It is an input device.
There are so many

keys on keyboard.
We can type the text

with the help of a
keyboard.
A keyboard has alphabet, number and function
keys.
Alphabet keys are from A to Z.
Number keys are from 0 to 9.
Function keys are from F1 to F12

New Gateway to Computer Science Book - One 45

Mouse

It is a popular input
device.

It is also called a
handheld pointing
device.

It has two or three
buttons.

System Unit

It is also called Central
Processing Unit (CPU) of
the computer.

It is the brain of the
Computer.

It has power button to on
and off.

It has also a restart button.

46 New Gateway to Computer Science Book - One

a. Which device looks like a Score

television screen? ..................
b. Is a monitor an output device?
10

c. Is the output of a monitor changeable?

d. Is a keyboard an output device?

e. Which device is called a handheld
pointing device?

f. Which part of the computer is called the
brain of the computer?

g. How many buttons does a mouse have?

h. Are A to Z alphabet keys?

i. Can we see results on the monitor screen?

j. Is a mouse an output device?

New Gateway to Computer Science Book - One 47

Evaluation Time

1. Write Yes or No for the following questions:
a. Is a monitor an input device?
b. Is a mouse an input device?
c. Is a keyboard an output device?
d. Is system unit is the brain of the
computer?

2. Answer the following questions:

a. Name any two input devices.

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

b. Name any two output device.

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

48 New Gateway to Computer Science Book - One

c. How many buttons does a mouse have?

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

d. Which device is called a handheld pointing
device?

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

e. Which part of a computer is called the
brain of a computer?

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

f. Can you see output on the monitor screen?

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

g. Which device looks like a television screen?

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

h. In which device you can see the function

keys?

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

New Gateway to Computer Science Book - One 49

3. Match the following:
Keyboard
Mouse
System Unit
Monitor

50 New Gateway to Computer Science Book - One