DELHI PUBLIC SCHOOL

SECTOR V, B.S.CITY

E – CONTENT -from-25/01/2021 to 30/01/2021, (SUBJECT – GENERAL

SCIENCE), CLASS-IV.

Lesson no. 14

Our Environment:

Our environment is made up of both living and non-living things. We depend

on our environment for all our needs. Yet we care very little about it.

The addition of undesirable substances into the environment is called

pollution.

The harmful substances which enter our environment and cause pollution are

called pollutants.

The different types of pollution are:

1. Air pollution

2. Land pollution

3. Water pollution

4. Noise pollution

1. Air pollution:

Causes of air pollution:

Cutting down trees over a large area is called deforestation.

Deforestation and increase in the level of carbon dioxide in the air leads

to global warming.

Effects of air pollution:

Planting trees on an area of land in order to form a forest is called

afforestation.

2. Land Pollution:

Waste which can be decomposed by micro

biodegradable waste.

Planting trees on an area of land in order to form a forest is called

Waste which can be decomposed by micro-organisms are called

Planting trees on an area of land in order to form a forest is called

organisms are called

Waste which can never be decayed or decomposed are called as non-

biodegradable waste.

ASSIGNMENT:

Answer the following questions:

Q1) What is pollution? What are the four types of pollution?

Q2) What is the difference between afforestation and deforestation.

Q3) What is global warming? Explain how afforestation reduces global

warming?

Q4) Explain biodegradable and non-biodegradable wastes giving suitable

examples.

Q5) Mention any two causes and effects of land pollution.

Q6) Write any four ways to control land pollution.

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DELHI PUBLIC SCHOOL

Sector –V, B. S.CITY

E-CONTENT

(SUBJECT – S.St) CLASS – IV

Term: II

From 18.01.21 to 23.01.21

TOPIC- L- 19 OUR CULTURE

SUB-TOPIC: PAINTINGS, OUR FESTIVALS

** CONTENT OF THE ABOVE LESSON:

• PAINTINGS: Early humans painted on walls of

caves they lived in.

• The Ajanta Cave Paintings in Maharashtra show

scenes from the life of Lord Buddha.

• The Mughal emperors were also great patrons

of art and invited painters to their court from

Persia. Miniature paintings became popular

during this period.

• Rajput paintings depict battle scenes, life of

kings and people and also depict scenes from

the life of Sri Krishna.

• OUR FESTIVALS: People belonging to different

religions celebrate their joy and happiness by

celebrating various festivals.

• These are of threetypes-

a) National Festivals: They are celebrated with

the feeling of patriotism all over the country.

( Independence Day, Republic Day, Gandhi

Jayanti)

b) Religious Festivals: They show the religious

association of people with the festivals.

Diwali, Dussehra,Gurupurab, Eid, Christmas,

Buddha Purnima,Mahavir Jayanti etc. are

some religious festivals.

• Harvest Festivals: Harvest Festivals are

celebrated at the beginning of a particular

season or at the time of harvesting of crops.

Some of them are- Baisakhi in Punjab, Bihu in

Assam, Pongal in Tamil Nadu and Onam in

Kerala.

• Some festivals are celebrated in particular

seasons,such as Basant Panchami and Holi are

celebrated in spring seasons. In India , all

festivals are celebrated with special meals,

sweets, prayers, new clothes, exchanging gifts

and greetings.

• Instruction: Exercises given below after the content to

bedone in the S.St copy.

• Exercises

• Questions/Answers (Write the question also in your

S.St copy)

I) 1.What kind of paintings became popular during the Mughal

Rule?

Ans: Miniature paintings became popular during the Mughal

Rule.

2. What are harvest festivals? Give two examples.

Ans: Harvest Festivals are celebrated at the beginning of a particular

season or at the time of harvesting of crops. Two examples are-

Baisakhi in Punjab and Bihu in Assam.

3.What are religious festivals? Give two examples.

Ans:Religious festivals show the religious association of people with

the festivals. Examples are_ Diwali and Eid.

II) Fill in the blanks: ( Write the complete sentence in your s.st.

copy)

1. The Ajanta Cave paintings in _____________ show scenes

from the life of Lord Buddha.

2. __________ festivals are celebrated with the feeling of

patriotism all over the country.

PROJECT:-:-Draw or paste and name any one of the great

personalities of our country on ¼ chart paper.

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DELHI PUBLIC SCHOOL, B.S.CITY

ECONTENT -20 23.01.2021

TECHNICAL ACTIVITY

CLASS – 4

REVISION

INTERNET AND ITS SAFETY:

Internet safety or online safety or cyber safety or E-Safety is

trying to be safe on the internet. In order to keep safety ,you need to

know about different types of online dangers.

Understanding Online Dangers:

1.Phishing: It is a type of scam where the scammer tries to trick

you into revealing your personal information.Usually it involves

an email,instant message or website.

2.Piracy:It refers to illegally sharing copyrighted materials.This

includes music,movies,TV shows and software.

3.Cyber bullying: It is bullying that occurs online,through text

messaging,email or social networks.

4. Cyber –stalking: It is any kind of harassment or threatening

behavior that occurs online, through text messaging,email,or social

networks.

5. Malware: It is a software that is designed to damage your

computer or steal your personal information. It includes viruses,

spyware and other types of software.

Here are a few places where you may find online threats:

Chat & IM(Instant Messaging)

Computer Games

Texting

Email

Software Download

Social Networks

Internet Safety Rules (Guidelines for keeping you safe):

Keep personal information private.

Set standards for what you can and cannot do online.

Practice Safe Browsing.

Make sure your Internet connection is secure.

Be careful what you Download.

Choose strong Passwords.

Learn to use social networking sites safely.

Be careful what you Post.

Talk to your parents or teachers if you are a problem online.

MSW LOGO (REVISION)

LOGO is a programming language used to draw figures and

perform simple arithmetic calculations.

LOGO has been used in telecommunications,multimedia and

robotics.

LOGO commands are also called as Primitives.

Pen commands of LOGO:PU,PD,PE,PX

PU (PEN UP): By using this command it causes the turtle to pick

up its pen so that when it moves no line is drawn.

PD (PEN DOWN):By using this command ,turtle puts the pen

back down so that the drawing starts again.

PE (PEN ERASE): To erase a line ,type the command PE and

move the turtle forward or backward to the required steps.

PX (PEN REVERSE) :

PX command is used after PE command.It makes the turtle start

drawing again.

PR (PRINT ): This command is used to display a text,number

or message on the screen.The output will be displayed in the

commander window.

REPEAT COMMAND:

The PEPEAT command lets the turtle to repeat the instructions

many times.

Drawing figures using REPEAT

Type the commands in the input box for drawing the figures.

1.SQUARE:

REPEAT 4[FD 50 RT 90]

2.TRIANGE:

REPEAT 3[FD 50 RT 120]

3.RECTANGLE:

REPEAT 2[FD 50 RT 90 FD 100 RT 90]

4.PENTAGON:

REPEAT 5[FD 50 RT 72]

5.HEXAGON:

REPEAT 6[FD 50 RT 60]

6. CIRCLE:

REPEAT 360[FD 1 RT 1]

7.SEMICIRCLE:

REPEAT 180[FD 1 RT 1]

8.QUARTER CIRCLE:

REPEAT 90[FD 1 RT 1]

MS-POWERPOINT (REVISION)_

A presentation is an act of showing and explaining the contents

of a topic to an audience.

PowerPoint is a presentation software that allows you to create

presentations by combining text,pictures,videos,sound,charts,

animation and graphics with a number of special effects.

PowerPoint uses slides to build a presentation.

Slide: It is an electronic page of a presentation.Slides can have

titles,text,graphs,shapes,clip art,etc.

How to start MS-PowerPoint:

Click on Start > Programs > Microsoft Office > MS-PowerPoint

A file made in MS-PowerPoint is called a Presentation and has

an extension .ppt .

INSERT A NEW SLIDE:

1. From the Home tab click on the New Slide icon .

Or Press Ctrl+M

2. A new slide will be added to your presentation.

VIEWING A SLIDE SHOW:

Once you have created a presentation you can view how the

actual presentation looks.

1.From the Home Tab ,click on Slide Show.

2.Select From Beginning

Or press F5

DIFFERENT VIEWS OF POWERPOINT

Normal view is selected by default and shows the slide

and outline tabs,along with displaying the current slide.

Slide Sorter view displays smaller versions of all the

slides in the presentation.

Reading View displays only the slides with buttons at

the buttom of the screen for navigation.

Slide Show will play your slides as an actual

presentation.

EXERCISE

Q.1. Fill in the blanks:

a)PowerPoint uses slides to build a ____________.

b)____________ view displays smaller versions of all the

slides in the presentation.

d)___________ is an electronic page of a presentation.

e)The _____________view is selected by default.

I.Choose the correct options:

1. It is a type of scam where the scammer tries to trick you

into revealing your personal information.

a)Phishing b)Cyber-stalking

c)Malware d)Cyber bullying

2. It is widely used , so it’s popular tool for many different

types of scams.

a)Chat b)Phishing c)E-mail d)Malware

3. LOGO commands are also called

a)Turtle b)Cursor c)Prompt d)Primitives

4.This command causes the turtle to pick up its pen so that

when it moves no line is drawn.

a)PD b)PU c)PE d)PR

5. The command used after PE command is

a)Pen reverse b)Pen up c)Repeat d)Print

6. REPEAT 5[FD 50 RT 72] draws a __________.

a)Circle b)Octagon c)Pentagon d)Hexagon

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