New Gateway to Computer Science 1

Shubharambha CBlaososk

11
NEW GATEWAY to

COMPUTER SCIENCE

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, 01-4263459

Copyright © : Publisher

Edition : 2075

Publication : Shubharambha Publication Pvt. Ltd.
Kathmandu, Nepal

Preface Contents

Along with the evolution of human Unit 1
beings new thoughts, area of
knowledge and technology also 1. Electronic Devices
developed together. Among the
eruptions, ICT (Information and 2. Computer Alphabets 10
Communication Technology) is one
which has unquestionably become 3. About a Computer 20
important part of human beings.
A person is not better than a caged 4. Parts of Computer 29
pigeon if s/he is far from computer
technology in this century. New 5.. Understanding Keyboard 39
Gateway to Computer Science
Book-1 is a complete package which 6. Storage Devices 50
obviously supports a lot to the
students as this is one of the most 7. Starting a Computer 62
useful Text Book, so far available in
the market. This book is completely 8. Working with Calculator 70
prepared considering the level of the
students. This text has the various 9. Paint in Window 8 78
salient features like it focus on child
psychology, inclusion of comic’s Quiz Section 92
cartoons, conversation based, focus
on pictorial descriptions,quiz section, My Worksheets 97
worksheets, etc.
Guidelines to the teachers 108
Comments and constructive
suggestions are highly welcomed
from the readers and professionals to
update this text book.
Suggest us:
[email protected]

Thank you.

Unit : 1

Electronic Devices

Note to Teacher

Discuss about some electronic devices and non-
electronic things in class.

Tell students to draw some pictures of electronic
devices in their copies.

Ask some oral questions before starting the
lesson as given below.
»» Do you have mobile and television at home?
»» Have you seen fan and rice cooker at home?
»» Have you seen the calculator?
»» Does electronic devices need electricity to
work?

New Gateway to Computer Science Book - One 1

Look at the given pictures carefully.

Mobile Fan Heater

Rice Cooker Tablet Refrigerator

Television Radio Computer

Calculator Iron Printer

2 New Gateway to Computer Science Book - One

The above mentioned
pictures are of the electronic
devices which you might have
seen at your home. Let’s
talk something about the
electronic devices.
• All electronic devices are

the man made devices.
• Electronic devices are not

developed by the nature.
• Electronic devices need

electricity to work.
• Electricity is a source of

power for all devices to
work properly.

New Gateway to Computer Science Book - One 3

Again, look at the given pictures carefully.

Tree Chair

Sofa Table

Bed Book

4 New Gateway to Computer Science Book - One

Does the above things need electricity?

The above pictures are
not electronic devices
because they do not need
electricity to work. All
creations of nature are
not electronic devices
and all man made things
do not need electricity
to work.

a. Is calculator an electronic device?
b. Do computers need electricity to work?
c. Is a table an electronic device? Score
d. Is a television an electronic device? ..................

5e. What is the source of the power?

New Gateway to Computer Science Book - One 5

Evaluation Time

1. Write Yes or No for the following
questions.

a. Is a radio an electronic device?

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

b. Is a sofa an electronic device?

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

c. Does a fan need electricity to work?

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

d. Is your bed an electronic device?

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

e. Do you have television at home?

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

f. Is a television an electronic device?

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

6 New Gateway to Computer Science Book - One

2. Circle the name of electronic devices.

a. Fan b. Heater c. Tree
d. Sofa e. Radio f. Mobile

3. Name the following electronic devices.



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 7

Things that do not need electricity

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

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

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

4. Match the following

Computer

Television

Radio

Fan

Mobile

8 New Gateway to Computer Science Book - One

6. Paste the pictures of any four electronic
devices with their name.



New Gateway to Computer Science Book - One 9

Unit : 2

Computer Alphabets

Note to Teacher

Make students read the computer alphabets
from A to Z like 'A' for Abacus, a calculating
device; 'B' for Babbage, the father of computer.

Make the students read the spellings correctly.
Print some figure of devices as given in the unit

and tell them to identify their names.

10 New Gateway to Computer Science Book - One

There are so many computing
devices. Here we are going
to learn some devices and
computing terminologies
starting from English
alphabet A to Z. Lets discuss
the words with their spelling
and explanations.

Let’s read: Figure Explanation

Alphabets Words A calculating
device
A Abacus

B Babbage The father of
computer

New Gateway to Computer Science Book - One 11

C Computer Electronic
device
D DVD
Digital Video
E Excel Disk

F Floppy Computer
disk program

Small storage
device

G Google Search engine
H Hard disk
I iphone Large storage
J Joystick device

Mobile device

Used to play
games

12 New Gateway to Computer Science Book - One

K Keyboard Typing device

L Laptop Small
computer
M Mouse
Pointing device
N Network
Group of
O Output computers
device
Display result

P Printer Output device

Q Q-Basic Programming
language

New Gateway to Computer Science Book - One 13

RAM

R (Random Primary
Access memory

Memory) Input device

S Scanner

T Tablet Handheld
device
U UPS Power

V Vacuum protecting
Tube device

W Wi-fi Memory unit

Wireless
network

X XP Operating
Y You Tube system

Search for
videos

14 New Gateway to Computer Science Book - One

Z Zip Compressed
data

a. What is an Abacus? Score
b. What is Joystick?
c. What is Google? ..................
d. What is a Mouse?
e. What is a Printer? 10
f. What is a Tablet?
g. What is Network?
h. What is a window?
i. What is a Tablet?
j. What is a Hard disk?

New Gateway to Computer Science Book - One 15

Evaluation Time
1. Name the following devices.



16 New Gateway to Computer Science Book - One

2. Match the following:

Scanner

Mouse

Hard disk

Floppy disk


3. Write Yes or No for the following

questions.

a. Is hard disk a storage device?
.............................................................................................................................................................................

New Gateway to Computer Science Book - One 17

b. Is an XP an operating system?
.............................................................................................................................................................................

c. Is an UPS power protecting device?
.............................................................................................................................................................................

d. Is a scanner a primary memory?
.............................................................................................................................................................................

e. Is a mouse an output device?

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

4. Re- arrange the following jumbled
words.

a. SNNCARE : .....................................................................................................

b. OUSEM : .....................................................................................................

c. KBOEYARD : .....................................................................................................

18 New Gateway to Computer Science Book - One

d. RMA : .....................................................................................................

e. FLPYOP : .....................................................................................................

f. YJOSTKIC : .....................................................................................................

5. Fill in the gaps with the missing letters.

a. M ..... U ..... E

b. K ..... Y ..... OA ..... D

c. ..... O ..... I ..... OR

d. L ..... P ..... O .....

e. S ..... A ..... N ..... R

f. P ..... I ..... T ..... R

New Gateway to Computer Science Book - One 19

Unit : 3

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.

20 New Gateway to Computer Science Book - One

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

Have you ever seen a computer,
my little baby?

Yes! I have seen it
at my brother’s room and at
school too. Do you know papa?
There are a lot of computers
at my school but I do not know

more about them.

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

Really! I am too much
excited my papa.

New Gateway to Computer Science Book - One 21

Have you ever seen
radio, calculator, mobile,
tablet, television, freeze, rice
cooker, fan, etc. at home?

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. As you know, radio, calculator,
mobile, tablet, television, rice cooker,
etc. 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
because we can use computers for various types of
calculations. I am also using a computer at my office
for my official work.

22 New Gateway to Computer Science Book - One

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.
As you know that humans have
various physical parts for specific
work like eyes to see, ear to listen,
mouth to speak and the brain to think,
a computer also has its various parts to do the
work. The mouse, keyboard, Central Processing
Unit(CPU), monitor etc. are the physical
components of the computer. All parts of the
human body need to work together for proper
functioning, likewise all the parts of computer
must also work together to function properly.
The working principle of the computer is always
Input – Process – Output and Storage. It means
you have to give command to the computer at first.
After that, it goes for processing then displays
result which you can store for further use.

New Gateway to Computer Science Book - One 23

Papa! It is interesting. Really,
computer is an amazing device.

Thank you so much. Now, I
will tell these things to all my

friends in class.

a. Is a computer a calculating Score
device?
..................
b. What is the full form of CPU?
5

c. What is the working principle of
computer?

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

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

24 New Gateway to Computer Science Book - One

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.

New Gateway to Computer Science Book - One 25

2. Fill in the blanks with the correct word.

a. ......................... need electricity to

work. [Computers/Trees]

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 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, my little
baby?

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

26 New Gateway to Computer Science Book - One

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

.............................................................................................................................................................................
c. Really! I am too much excited, my 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. All parts of the human body need to
work together, likewise all the parts
of computer must also work together
to function properly.

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

New Gateway to Computer Science Book - One 27

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.

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

28 New Gateway to Computer Science Book - One

Unit : 4

Parts of Computer

Note to Teacher

Make the students to visit the computer lab.
Make them to 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 29

Look at the given pictures carefully.

Monitor Keyboard Mouse

System unit

Computer system Printer

Headphone Microphone Speaker

30 New Gateway to Computer Science Book - One

As humans have
different parts to
function, computers
also have some physical
parts. Without such
parts, a computer just
like a dead body of
human being.

A computer is an
electronic device that
manipulates the data.

Monitor

It is a computer
hardware.

It looks like a
television screen.

New Gateway to Computer Science Book - One 31

It is an output device of the computer
system.

Without monitor, we cannot see any results
on the screen.

The output displayed by monitor is
changeable. So, it is also called the soft
copy output device.

Hardware is the physical part of the computer.

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 and number-keys
like A to Z and 0 to 9.

32 New Gateway to Computer Science Book - One

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 is the main working
station for all the
components of a computer.

New Gateway to Computer Science Book - One 33

a. Which device looks like a Score
television screen?
..................
b. Is monitor an output device?
10

c. Is the output of monitor changeable?

d. Is keyboard an output device?

e. Which device is called a handheld
pointing device?

f. Which part of a computer is called
the brain of 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 mouse an output device?

34 New Gateway to Computer Science Book - One

Evaluation Time

1. Write Yes or No for the following
questions:

a. Is monitor an input device?

b. Is mouse an input device?

c. Is keyboard an output device?

d. Is system unit is the brain of a
computer?

3. Answer the following questions:

a. Name any two input devices.

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

b. Name any two output device.

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

New Gateway to Computer Science Book - One 35

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 computer?

...............................................................................................................................................................................
f. Can you see output on the monitor
screen?

...............................................................................................................................................................................
g. Which device looks like a television
screen?

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

36 New Gateway to Computer Science Book - One

2. Match the following:

Keyboard
Mouse

System Unit
Monitor

New Gateway to Computer Science Book - One 37

4. Colour the given picture.

Fill Red colour in the left mouse button
blue in the right button and green in other
parts.

38 New Gateway to Computer Science Book - One

Unit : 5

Understanding
keyboard

Note to Teacher

Prepare some play cards of different pictures
of a keyboard and demonstrate them in class.

Take the students to the computer lab and
explain them about the keys of a keyboard.

New Gateway to Computer Science Book - One 39

Look at the given pictures.

Observe the above
figures, there are
various types of
keyboards. They all
are used for typing. A
keyboard is a typing
input device with
various keys. Some of
the keyboard keys are
described below.

40 New Gateway to Computer Science Book - One

Alphabet Keys:

A to Z letters of
the keyboard are
alphabet keys.
You can press
respective key and check the output on the
screen.

Function Keys

Function keys are
located at the top
of the keyboard.
F1, F2, F3, F4,
F5, F6, F7, F8, F9, F10, F11 and F12 are the
function keys of a keyboard.

Number Keys

Number keys are
from 0 to 9. You
can see these keys
below the function
keys. You can use them to type the numbers.

New Gateway to Computer Science Book - One 41

Special Keys

Shift key, Spacebar key, Enter key and Back
space keys are the special keys of a keyboard.

Uses of some special keys:

Spacebar key

You can use this
key to give space
between the letters
or words. Spacebar
key is also the longest key of the keyboard.

Enter key

You can use this
key to type the
text from the
next line. When
you press the enter key, your cursor of the
screen moves to the next line.

42 New Gateway to Computer Science Book - One

Backspace key

You can use this key
to erase the unwanted
text or word. You can
delete the letters or
words one by one with the help of this key.

Shift key

You can use this key
to type the text in
capital letter. You
have to press ‘Shift
Key’ and the alphabet key together to type
the text in capital letter.

Arrow keys

You can use these
keys to move the
cursor to the new
place wherever you
like in the text. The arrow keys show the
directions up, down, left and right.

New Gateway to Computer Science Book - One 43

a. Which device is called the Score

typing input device? ..................
10

b. Tell the name of any four
function keys.

c. Is F10 a function key?

d. Which is the longest key of the
keyboard?

e. Where are the function keys located?

f. Which key is used to type the text in
capital letters?

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

h. What is the use of shift key?

i. Name any four arrow keys.

j. For what purpose we can use backspace
key?

44 New Gateway to Computer Science Book - One

Evaluation Time

1. Name the following keys:


2. Write True for correct and False for

wrong statements.

a. A to Z letters of the
keyboard are number keys.

b. The number keys are 0 to 9.

c. Shift key, spacebar key,
enter key and back space
keys are the special keys of
a keyboard.

d. You can use ‘Shift Key’ to give
space between the letters or
words.

New Gateway to Computer Science Book - One 45

e. F1, F2, F3 etc. are the
function keys of a keyboard.

f. Spacebar key is the shortest
key of the keyboard.

g. You can use enter key to type
the text from the next line.

h. Arrow key is used to type the
text in capital letter.

3. Fill in the blanks with suitable word(s).

a. ...................... is the longest key of a
keyboard. [Spacebar key / Shift key]

b. The buttons of keyboard are called

...................... [keys/ letters]

c. ...................... helps to type the text
from the new line.
[Enter key / Delete key]

46 New Gateway to Computer Science Book - One

d. ...................... are used to move the
position of the cursor
[Arrow Keys / Print keys]

e. You can use ...................... key to erase
the unwanted text from the word.
[backspace key / line key]

f. F10 , F11 and F12 are the ......................
keys of a keyboard.
[numeric / function]

4. Complete the following words with
appropriate letters.

a. S E....... ....... IA ....... KEYS

b. S ....... AC ....... BA .......

c. S ....... IFT

d. EN ....... E .......

New Gateway to Computer Science Book - One 47