Download class8 - Delhi Public School, Faridabad

DELHI PUBLIC SCHOOL, FARIDABAD
Holiday Homework (2016-17)
Class VIM
ENGLISH
Q.1
Read any story written by RUSKIN BOND and summarize it in your own words. Also give a twist
to the ending of this story. The story should include plot, character and setting.
Q.2
Watch any video related to 'English vocabulary'. Write its 'link' and give a description of this video.
Note : Do all the written work in English F.C.
5T01
5T02
3FJ^FT <^^n^ ^f^^ ^ ^I^^d RFft ^tcft, Wt^ F^ft eft cf^ ^^^ft ffl" ^^RT
cfjt
5T01
^7^", TTF^^^, ^^i<^<4, <S{^^ - ^^t ^^f ^t f^PT-^^ cTTT
^fcf^PT c^t ^fMcbl^ 5TT^T ^ cTTT 5f^^ tf^ ^^f! ^fJT
ART
i.Do the following pages of the art book : 42, 46, 50, 74
ii.Make a coloured composition (any scene including human figures on A3 size sheet)
•After watching the links the child should try doing the activity.
•Another activity will be held related to the video links in school after holidays.
Maths
The Pandits want to tile a square patio in their backyard. They buy 200 tiles; each tile
measures 30 cm by 30 cm.
I. What are the dimensions of the largest square patio they can make?
M;
1
I
1
!
-
i
J
1
:
:
•
:
;
11 •
ii
i!
unLJLI
. • .. ....-.^^.
1 T~
|j I LJU'
f | ;
r-j
J3SI
After looking at several plans, they decide
to arrange the tiles in a more imaginative
way. The plan below shows four tiled^
squares.
2. Following the pattern at
the left, how many total
squares can the Pandits
make with their
^^ 200 tiles?
etc.
To solve problem 2, you may have used-the sequence of
square numbers, as shown below:
16
+1
+3
+5
25
36
49
+7
3. a. Why is 0 considered a square number?
b. Describe the increases in the sequence of squares.
jf Use the dot patterns below to describe the increase in the sequence of squared
JH numbers.
..-
9
9
9
9
'©
9
0
Q
. 9
9
9
' 9
9 >
9
9
0
0
9
9 •
9
> 9
e ,
9
9
0
0
®
SThe squares of 20 and 21 are 400 and 441, respectively. This can be written as 202 = 400
|nd212 = 441.
400
5. a. Without mult
square of 22.
- b. Do the same
441
red
To find the square of a number, you can use
a diagram such as the one below.
6.Explain how to find 322 using the
area diagram to the left..*
:
i
7.a. Make a drawing like the one on \
the left to help you calculate 432|
b. Do the same for 5 72.|5
Chetan wrote down these calculations:
30
2002 = 40,000
2012 = 40,001
8. Do you agree with the calculations
above? Explain why or why not.
30
9. Aruna has a square patio made of 1,444 square tiles. She
wants to extend two sides of the patio as shown below. How
many extra tiles does she need?
1,444
square tiles
*
$
IFTED
RIPS
The square of a number n can be written as n • n or as n2. The next number after n can be
written as n + 1, so the square of n + 1 is (n + 1) • (n + 1) or (n + I)2.
10. How can you write the next number after n + 1? How can you write the square of that
number?
Leena (the girl who was investigating the odd numbers) decides to add her sequence of
odd.tiumbers to the n2 sequence.
0
16
11
25
13
36
I
2/1 + 1
n starts at 0
n starts at 0
n starts at 0
11.Copy the three number strips above into your notebook.
a.Find the missing numbers and the expression for the third strip.
b.What do you notice about the number sequence in the third strip?
12.Leena wrote the expression (n + I)2 for the third strip. Is she correct? Explain why or
why not.
I HAVE TWO EXPRESSIONS
NUMBER STRIP: (n+ 1)2 AN
THE TWO EXPRESSIONS MUST
13. Use the diagram below to explai
statement, (n + I)2 = n2 + 2n +
n
s
n
f
[n + I)2 sequence starts one step later than the n2 sequence.
ILeena wonders how to get a sequence that starts two steps later.
0
16
25
16
36
25
49
36
64
I
n1
(n + 2V
n starts at 0
n starts at 0
n starts at 0
14. a. Copy and complete the number strip in the middle.
b.What expression describes the second strip? (Be sure n starts at 0 with your
expression.)
c.Use the expressions from the first two strips to write an equivalent expression for
(n + 2)2.
d.Use an area diagram to explain your answer in part c.
I You can keep starting the sequence later and later by adding one more to n each time, as
I shown below.
I Sequence
Formula
! - -1,4,9, 16, . .
n2 = n2
1-4,9,16,...
4,9,16,...
9. 16,...
(n+ I)2 = n2 + 2n + 1
(n + 2)2 = n2 + An + 4
(n + 3)2 = n2 + 6n + 9
15. By looking at patterns, predict what the
equivalent expression to (n + 4)2 would
be. Where does the sequence start?
Summary
•The square of a number is the number rpultiplied by
itself. For example, the square of 4 is 4 • 4 = 42 = 16.
•The term square becomes9 ^ ® ©
clear if you look at dot
© 9 © ©
patterns. You can show 16 as
a dot pattern with 4 rows of© © © ©
4 dots.—
*
© 9 © ©
•The sequence of square numbers forms several
patterns:
+i
+
+2
+++2
+2+2
+2
+2
Summary Questions
16. a. Describe the patterns of the sequence of the square
numbers above in your own words.
b. Continue the sequence of squares for six more numbers.
If you start the n2 sequence three
steps later, you get the (n + 3)2
3/j
sequence. You can show that
_.(n + 3)2 is the same as the
expression n2 + 6n + 9 by using
- an area diagram.
3n\
n
17. Write an expression that is
equivalent to (n + 10)2.
n
PHYSICS
I.Ultrasonic waves are elastic waves having frequency more than normal audible limit i.e. (>20,000
Hz). Many animals like bats, dolphins and dogs can produce and hear such sounds while we
human beings are insensitive to it. These are high frequency and high energy vibrations which have
the ability to travel along well defined paths and get reflected from places wherever there is change
in density. This property of ultrasonic waves makes them much more useful than ordinary sound
waves for certain purposes. Apart from its use in many other fields, ultrasonic waves find a major
use in field of medicine like ultrasonography, ECG, relieving muscular or joint pain, treating stones
in kidney getting to know about internal organs, finding abnormalities in a foetus in case of pregnant
women and many more.
Task : Collect pictures and relevant information regarding use of ultrasound in field of medicine and
prepare a collage on A-3 size sheet.
II.Music is a sound which appears pleasant to our ears and gives a smoothing effect. Music consists
of sound waves that have regular patterns.
Since sound is produced by a vibrating source so different things vibrate in different musical
instruments to produce sound.
Type of musical instruments are :
i.
String Instruments: String of instrument vibrates
eg. Sitar, Guitar
ii.
Wind Instruments: air column vibrates
eg. Flute, Shehnai
iii.
Percussion Instruments
eg. Tabla, Dholak, Drum.
iv.
Ghan Vadya: Whole instrument vibrates
: membrane vibrates
eg. Jaltarang, Manjeera
Task : Make a working model of musical instrument using waste items preferably and write a short
note about it an A-4 size sheet elaborating which part of instrument vibrates to produce sound.
CHEMISTRY
We know all the metals are good conductor of heat and electricity. In the metals electrons carry charges.
But in liquids charges are carried by different types of particles called ions.
An ion is an atom or group of atoms which have positive or negative charge.
In liquids these ions produce weak current which is not sufficient to heat
up the filament of torch bulb and thus bulb does not glow (a bulb glows
only when its filament is heated to a high temperature). It means for using
the conduction tester for the liquids, we have to modify it by replacing the
bulb with any other device which can sense to weak currents. This can
be achieved by using LED (Light-emitting diode). LED glows even when
a weak electric current flows through it. There are two wires (called
leads) attached to an LED. One lead is slightly longer than the other.
Remember that while connecting to a circuit the longer lead is always
connected to the positive terminal of the battery and the shorter lead is
connected to the negative terminal of the battery.
ACTIVITY-1LEDs
To prepare a conduction tester with LED.
Take a LED, three pieces of wire, plastic bottle caps and a battery. Collect different types of liquids such
as lemon juice, tap water, distilled water, lime water, common salt-water solution, vegetable oil, vinegar, milk
and honey in separate plastic bottle caps. Arrange the setup.
First of all dip the free ends of the conduction tester in
lemon juice and observe whether the LED glows or not.
If the LED glows then the lemon juice is a conductor
and if LED does not glow the lemon juice is an insulator.
Take out the ends of the tester from the lemon juice, dip
them in water and then wipe them dry. Repeat the
activity with other liquids and record your observations
in the table below.
Battery
liquid
Insulated
copper w
Conduction Tester with LED
S.No.
Material
1.
Lemon juice
2.
Distilled water
3.
Common salt
water solution
4.
Tap water
5.
Lime water
6.
Vegetable oil
7.
Vinegar
8.
Milk
^.
Honey
LED Glows
or Not
Conductor/
Insulator
In the activity you will observe when both free ends of conductor tester are dipped in lemon juice, vinegar,
common salt-water solution, tap water, lime water, and milk, LED glows and thus these materials are
conductors whereas in case of distilled water, honey and vegetable oil, LED does not glow. Thus distilled
water, vegetable oil and honey do not conduct electricity.
Electrical Conductivity of Water
Pure water (or distilled water) is a poor conductor of electricity but tap water is a good conductor of
electricity. Why is it so? Actually tap water is not the pure form of water. It contains many dissolved salts
in the form of impurities. Presence of these dissolved salts make the water a good conductor. When a salt
is added to pure water, it dissociates into ions. For example, when common salt (sodium chloride or NaCI)
is added to water it dissociates into sodium ion and chloride ion. These ions make the pure water good
conductor of electricity.
Intext questions
Correct the following statements and rewrite them:
1.The positively charged particles of an atom are called electrons negatively charged particles are
called protons.
2.LED does not glow when a weak electric current flows through it
3.Distilled water is a good conductor of electricity.
ACTIVITY-2
To prepare a collage showing contribution of various scientists in the field of chemistry. (On A-3 sheet)
BIOLOGY
Historically, food were grown, collected and eaten from a relatively unpolluted earth as the human
population grew exponentially. Farming progressed, trade developed, and local markets shared a
variety of goods among a diversity of people.
Techniques for food preparation and preservation, such as pickling, salting and smoking were
developed to deal with the new problems of storage, waste, and food-borne illnesses. With
advanced technology, our modern food industry's reliance on processing and additives continues
to increase. This seemingly abundance of food stuffs found in our super markets of today is
deceiving our bodies by selling food products that are chemically altered and designed to appeal
to us.
"Prepare a paper presentation on the topic of food preservation and food adulteration"
GUIDELINES
i.Presentation should include 7-8 pages which carries information like common
Adulterants and methods of preservation; their effect on our health; food safety laws etc.
ii.
Support your presentation with related pictures and statistical data
SOCIAL SCIENCE
Topic: Land Conservation and Management Case study of Ralegaon Siddhi or Hiware Bazaar
(Maharashtra)
•Project Report to be submitted of not more than 6 pages (12 sides, A-4). The report will include
causes for the drought condition in Central Maharashtra and the effects. Efforts towards combating
the situation can be highlighted. Maps, graphs, statistics, pictures can be added along with
newspaper clipping.
•Government initiatives towards drought control and land management.
•Trace the history of famines (with dates) in Vidharba region.
•The project needs to be hand written.
On the outline political maps of India, mark the following
•The areas which are drought prone.
•The states which are presently drought hit.
GERMAN
Q.1
Prepare a PPT on any one of the following topics :
i.Meine Familie
ii.Mein Haus
iii.Die Tiere
iv.Begrijpungen
v.Essen nd Trinken
vi.Schule (Facher und Stundenplan)
vii.Verben (regelmapig, unregelmapig, trennbare)
viii.Modal verben
ix.Klauses (Nominative, Akkhusative, Dative)
x.Imperative
Q.2
The culture in Germany is different from the culture in India. Write down a few points as to how we
can learn and inculcate them in our lives.
LIFE SKILLS
Teach a child or an adult who is illiterate, and help them to learn the following :
'EACH ONE TEACH ONE" Project I
teach him or her to write own name and sign own name
I
counting from 1 to 31
I
days of the week
I
names of the months.
I
teach them day/ date/ month/ year
This will help them to understand dates and use their signatures when required.
I
Last day- present your student with an ice cream of your choice to celebrate the learning
and take a selfie with your student together with the sheet where your student has written
his/ her name and date)
FRENCH
Q.I) Lisez les Ie9ons 1, 2, 3, et 4 du texte. Choisissez les noms et les ecrivez (Mas
/ Fern).
Masculin
Feminin
Le livre (The book)
La gomme (The eraser)
Q. 2) Conjuguez les verbes suivantes.
Construire,Rire, Eteindre, Devoir, Pouvoir, Connaitre, Voir, Boire, Savoir,
Faire, Lire, Ecrire, Recevoir, Dire, Prendre, Choisir, Mettre, Aller, Venir,
Sortir, Attendre, VouloirJeter, Appeler, Payer
Q. 3) Decrivez deux personnalites fran^ais.
Q. 4) Completez le cahier d'exercice pages de 5 a 22.
Q. 5) Decrivez les images
GERMAN
Q.1
Prepare a PPT on any one of the following topics :
i.Meine Familie
ii.Mein Haus
iii.Die Tiere
iv.Begrijpungen
v.Essen nd Trinken
vi.Schule (Facher und Stundenplan)
vii.Verben (regelmapig, unregelmapig, trennbare)
viii.Modal verben
ix.Klauses (Nominative, Akkhusative, Dative)
x.Imperative
Q.2
The culture in Germany is different from the culture in India. Write down a few points as to how we
can learn and inculcate them in our lives.
LIFE SKILLS
Teach a child or an adult who is illiterate, and help them to learn the following :
'EACH ONE TEACH ONE" Project I
teach him or her to write own name and sign own name
I
counting from 1 to 31
I
days of the week
I
names of the months.
I
teach them day/ date/ month/ year
This will help them to understand dates and use their signatures when required.
I
Last day- present your student with an ice cream of your choice to celebrate the learning
and take a selfie with your student together with the sheet where your student has written
his/ her name and date)