DELHI PUBLIC SCHOOL

SECTOR V, B.S.CITY

E – CONTENT -from-28/12/2021 to 30/12/2021, (SUBJECT – GENERAL SCIENCE), CLASS-IV.

Lesson no. 12

Weather, Air and Water:

Trees help to filter the air:

Assignment:

Answer the following questions:

1. Write any four causes of air pollution. 2. How can we reduce air pollution? (Write any four points.) 3. How do trees help to filter the air?

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DELHI PUBLIC SCHOOL SECTOR–V, B. S.CITY

E-CONTENT(SUBJECT – S.St)

CLASS –IV

Term: II

From 21.12.20 to 23.12.20

TOPIC- L- 20 OUR NATIONAL SYMBOLS

SUB-TOPIC: NATIONAL EMBLEM

** CONTENT OF THE ABOVE LESSON: The National Emblem is the seal of the government of India. It can be

seen on all government documents, currency notes, coins and letters . It has beenadopted from the Lion Capital erected during Emperor

Ashoka’s time( Ashoka Pillar) at Sarnath near Varanasi in Uttar Pradesh.

It has four lions facing four directions, but the fourth one is hidden. The lions stand for courage and power.

The base of the emblem shows a horse which symbolises energy and speed and the bull symbolises the importance of hard work.

A wheel is seen between the horse and the bull. The words Satyameva Jayate which means ' truth only triumphs' are inscribed below the wheel.

Instruction: Exercises given below after the content to be done in the S.St copy.

Exercises

I) Answer the following questions. (Write the questions also in your S.St copy)

Q1. Where can you see the national emblem?

Ans. The National Emblem is the seal of the government of India. It can be seen on all government documents, currency notes, coins andletters.

Q2. What is the meaning of Satyameva Jayate?

Ans 2. The word Satyameva Jayate means ‘truth only triumphs.’

II) Fill in the blanks:( Write the complete sentence in your S.St copy)

a) The bull symbolises the importance of _______. b) Our national emblem has four lions facing four

__________. III) Complete the following sentences: (Write the complete

sentence in your S.St copy) a) The National Emblem is the seal of the _____________. b) The base of the emblem shows a horse which

symbolises __________.

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DELHI PUBLIC SCHOOL, B.S.CITY

ECONTENT -16 26.12..2020

TECHNICAL ACTIVITY

CLASS – 4

MSW LOGO

LOGO is a programming language used to draw figures and

perform simple arithmetic calculations.

LOGO has been used in telecommunications,multimedia and

robotics.

So far you learned and practised these LOGO commands :

FD,BK,LT,RT,HT,ST,CS,HOME,REPEAT, etc.

LOGO commands are also called as Primitives.

Now,lets learn some more commands: PU, PD,PE, PX,PR

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.

Example: Type the commands in the input box:

FD 100

PU

FD 50

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

pen back down so that the drawing starts again.

Example: Type the commands in the input box:

FD 100

PU

FD 50

PD

RT 90

FD 100

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

and move the turtle forward or backward to the required steps.

Example: Type the commands in the input box:

FD 100

RT 90

FD 50

RT 90

FD 100

PE

BK 50

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.

The text should be typed in inverted commas “ “

or square bracket [ ]

where as number should be typed without using inverted

commas or square bracket.

Example: Type the commands in the input box:

PR “Hello”

PR [This is LOGO]

Print(PR) command is also used to solve simple calculations in

LOGO. The symbols +, -, * and / are used for

Addition,Subtraction,Multiplication and Division respectively.

Example:Type the commands in the input box:

PR 20+30

PR 350-100

PR 15*8

PR 550/10

EXERCISE

Q.I. Choose the correct answer:

1. LOGO commands are also called

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

2.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

3. The command used after PE command is

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

Q.II. Answer the following questions:

1.What is LOGO ?

2.What is meant by Primitives ?

Q.III. Practice the uses of PU,PD ,PE,PX and PR commands.