DPSG, PV
CLASS – IX
HOLIDAY HOMEWORK
PHYSICS
TOPIC-MOTION
Change in position of an object w.r.t to time is called motion. Motion in
physics can be simply described in terms of displacement(s), distance(d),
speed(v), velocity(v),acceleration(a) and time(t).
The motion is always relative. Motion is relative to the person observing it.
Equations of Motion: (The Small Arrows Symbolise Vector Quantities)
S = ut + ½at²
1. What is meant by the statement „Rest and motion are relative terms‟? Give
an example to support your answer.
2. Define the terms [a] Reference point, [b] State of rest, [c] State of motion
3. Define scalar and vector quantities, support your answer with an example.
5. A boy moves in a circular path of radius R. He makes a around along the
circumference and stops. Find the distance travelled and net displacement.
6. A ball is thrown vertically upwards. It reaches a height h and comes back to
its initial position. Calculate distance travelled and displacement of the ball.
7. When is the average speed equal to the magnitude of the average velocity
for a moving body?
8. Can the average speed of a moving body be zero? Give reason.
9. Can the average velocity of a moving body be zero? Give Examples.
10. A car covers a distance of 5 km in 20 minutes. Find the net velocity of the
car in (a) km/min (b) m/s (c) m/min (d) km/h.
11. A train is moving with a velocity of 45km/h. calculate the distance
travelled by it in 1 hour ,1 minute ,1 second .
12. An object P is moving with a constant velocity for 5 minutes. Another
object Q is moving with varying velocity for 5 minutes. Out of these two
objects, which one is experiencing net acceleration 0? Explain.
13. Can an object be accelerated if it is moving with constant speed? If yes,
explain giving examples.
14. (i) When do you say that an object has positive acceleration? (ii) When do
you say that an object has negative acceleration? State the condition and give
one example for each from daily life.
15. State which of the following situations are possible and give an example
for each:- (a) A body moving with constant acceleration but with zero velocity.
(b) A body moving horizontally with acceleration in vertical direction. (c) A
body moving with a constant speed in an accelerated motion.
16. Name the 2 physical quantities apart from velocity and time which can be
obtained from velocity-time graph.
17. An electric train is moving with a uniform velocity of 120km/hr. How
much distance will it travel in 30 sec?
18. Give differences between linear motion and circular motion. Give Example
for both types of motions. Is it possible to have a circular motion with no
change in velocity?
19.A body moves around the sun with constant speed in circular path. Is the
motion of the body uniform or accelerated?
20. Name the physical quantity which remains constant during uniform circular
motion.
21. Name the physical quantity which changes during uniform circular motion.
22. An object has moved through a distance. Can it have zero displacement?
Support your answer with an example.
23. A physical quantity is measured 10m/s. is it speed or velocity?
24. A car is moving with a uniform velocity of 10m/s. The driver of the car
decides to overtake the bus moving ahead of the car. So the driver of the car
accelerates at 1m/s2 for 10 sec(s). Find the velocity of the car at the end of 10
sec(s). Also, find the distance travelled by the car.
Higher Order Thinking Skills Questions
Q.1 Calculate the speed of the tip of the seconds hand of the watch of length
1.5cm. [Hint: Length travelled along Circumference per unit time]
Q.2 Two bodies are moving with constant speed v such that they are always at
a constant distance „d‟ apart and their velocities are always equal in opposite.
After what time they will return to their initial positions?
COMPLETE THE CROSSWORD PUZZLE AFTER DOING LAWS OF MOTION
CHEMISTRY
TOPIC – MATTER IN OUR SURROUNDINGS
Q.1 Camphor disappears without leaving any residue. Explain?
Q.2 Why do we feel cool when we touch a piece of ice?
Q.3 Convert the following:a) 573 K to 0 C
b) 36 deg C to K
Q.4 Both the process of evaporation and boiling involves the change of state from
liquid to gas but still they are different from each other. Justify.
Q.5 Why is Kelvin considered as the best scale for measuring the temperature?
Q.6 How can you show that evaporation causes cooling?
Q.7 What is the significance of boiling point & melting point of a substance?
Q.8 When we put CuSO4 in water, after sometime we find the soln. turns blue. Why?
Also, on heating it, what change will occur?
Q.9 How can you justify that table is a solid?
Q.10 Arrange the following in decreasing order of force of attraction: Water, Salt,
Oxygen, Also, state the reason.
Q. 11 State characteristics of matter demonstrated by diffusion.
Q.12 When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance
spreads in the whole room quickly. Which characteristic of the particles of matter
is illustrated by this observation?
Q.13 The boiling point of alcohol is 78 deg C. What is this temperature on Kelvin
scale?
Q. 14 The Kelvin scale temperature is 0 K. What is the corresponding Celsius scale
temperature?
Q.15 What is Latent Heat of Fusion?
Q. 16 Define latent heat of Vaporization?
Q.17 A substance has no mass. Can we regard it as matter?
Q.18 What is plasma? Give one example in which matter is present in the plasma state.
Q.19 Out of water and alcohol which one is more volatile ?
Q.20 How will you demonstrate that particles of matter have space between them?
Q.21 How will you justify that ice, water and steam are the three states of a substance
and not different substance?
Q.22 Why does ice does not deposit in the freezer of a refrigerator equipped with
defrosting technique. Explain.
Q.23 Why do we say that evaporation is a surface phenomenon?
Q.24 Ordinary water boils at 1000c. Can it be made to boil at 950c or 1050c ?
Q.25 How is it possible to skate on ice without leaving trail behind? Explain.
Q. 26 What happens when?
A) We exercise vigorously.
B) Carbon dioxide gas is compressed at room temperature and pressure is
suddenly
released.
c) Sodium chloride is added to water with constant stirring.
Q.27 Explain the following:
A) Ice has lower density than water.
B) We should not wear terylene clothes in summer.
Q 28 Interconversion of states of matter is a constant temperature process. True or false,
justify.
Q.29 How will you demonstrate that water vapours are present in air?
Q.30 What is evaporation? Explain the factors which influence evaporation.
BIOLOGY
TOPIC- CELL – THE BASIC UNIT OF LIFE
Cell : The structural and functional unit of all living organisms . Cytology ( cell biology
) under which cell structure is studied.
History of cell : Cell discovered by Robert Hooke in 1665 , Robert Brown discovered
nucleus in the cells , Purkinje protoplasm in the cell.
Shape of cell : Spherical polygonal , cuboidal , spindle , cylindrical etc. .
Structural organisation of cell : Plasma membrane , nucleus et cytoplasm with cell
organelles .
Plasma membrane : Outermost covering of cell separates the cell contents from the
external environment .
Nucleus : Spherical , oval , darkly strained structure lies usually in the center of
animal cells but is displaced to one side in plant cells.
Cytoplasm : It contains about 90 % water , 7 % proteins , 2% carbohydrates and lipids
and 1 % inorganic materials , minerals , vitamins etc.
Cell Organelles: Endoplasmic reticulum, Golgi apparatus, Mitochondria, Vacuoles,
Lysosomes, Ribosomes, Centrosomes.
Q1 Write the main function of leucoplast.
Q2 What is the function of SER in liver cells of vertebrates?
Q3 Why the RER appears rough?
Q4 Why viruses are not supposed to be living?
Q5 What is a nucleoid?
Q6 Why dry raisins placed in water swell up?
Q7 Where are genes located?
Q8 What will happen if we keep a plant cell or animal cell in a (i) Hypotonic solution
(ii) Hypertonic solution iii) Isotonic solution.
Q9 Explain the importance of osmosis for living beings?
Q10 Give the historical development of cell theory.
Q11 Who coined the term “cell “and how?
Q12 Write the contribution of (a) Robert Hooke, (b) Leeuwenhoek (c) Robert Brown
Q13 Draw a large diagram of an animal cell as seen through electron microscope.
Label the parts that carry on the function of Respiration, secretion, protein synthesis,
transport of material.
Q14 Which substance is responsible for transfer of characters from one generation to
another?
ivaYaya - ihMdI
inado-Sa Á svacCta evaM vat-naI ka ivaSaoYa Qyaana rKo
idyaa gayaa samast ga`IYmaavakaSa kaya- ihMdI vyaakrNa puistka maoM ikyaa jaaegaa ³1´ inamnailaiKt P`aSnaaoM ko ]%tr ek- dao pMi@tyaaoM maoM ilaiKe1º ima+I kI AaBaa @yaa hOÆ ]sakI phcaana iksasao haotI hOÆ
2 QaUla paz ka ]d\doSya @yaa hOÆ
3 bauiZ,yaa kI paoSaak doKkr laoKk kao kOsaa lagaaÆ
4 kiva nao Apnao P`aBau kao ikna -ikna $paoM maoM doKaÆ
5 rOdasa nao Apnao‘pdaoM’ maoM iksa BaaYaa ka P`ayaaoga ikyaa Æ
³2´ inamnailaiKt p`Sna ka ]%tr ³25¹30 SabdaoM maoM´ ilaiKe −
1º Eawa¸ Bai>¸ snaoh kI vyaMjanaa ko ilae QaUla savaao-%tma saaQana iksa p`kar hOÆ
2º [sa paz maoM laoKk nao nagarIya saByata pr @yaa vyaMgya ikyaa hOÆ
3 manauYya ko jaIvana maoM paoSaak kI @yaa BaUimaka hOÆ
4 kiva rOdasaÊ naamadovaÊ kbaIr Ê i~laaocana AaOr saQanaa kI cacaa- @yaaoM krto hOMÆ
5 rOdasa Apnao pdaoM ko d\vaara hmaoM @yaa saMdoSa donaa caahto hOMÆ
6 AKaDo kI imaT\TI kI @yaa ivaSaoYata haotI hOÆ
7 rOdasa ko laala kI @yaa- @yaa ivaSaoYataeÐ hOMÆ
8 laoiKka ka Qyaana AakiYa-t krnao ko ilae igallaU @yaa krta qaaÆ
9 QaUlaÊ QaUila ÊQaUlaIÊ QaUir AaOr gaaoQaUila kI vyaMjanaaAaoM kao spYT kIijaeÆ
10 ‘ duK manaanao ka BaI ek AiQakar haota hO.’ iTPPaNaI kIijae.
³3´ inamnailaiKt p`Sna ka ]%tr ³50¹60 SabdaoM maoM´ ilaiKe –
1º laoKk 'baalaÌYNa' ko mauÐh pr Caš gaaoQaUila kao EaoYz @yaaoM maanata hOÆ
2º kivata kao ivaDMbanaa maanato hue laoKk nao @yaa kha hOÆ
3º ‘duK ka AiQakar’ kI saaqa-kta spYT krto hue inacalao vaga- kI ivaYama pirisqatyaaoM ka ]llaoK
kIijae.
4º Kasa pirisqayaaoM maoM hmaarI paoSaak hmaoM Jauknao sao raoktI hO.@yaaoM OÆ
5º igallaU kI iksa baat sao ]saka laoiKka ko P`ait lagaava P`akT haota hOOÆ AapkI dRiYT maoM @yaa
eosaa saMBava qaaÆ
³4´ ide gae saMkot ibaMduAaoM ko AaQaar pr 80¹ 100 SabdaoM maoM AnaucCod ilaiKe.
smaaT- @laasa kI ]pyaaoigata
saMkot ibaMdu– Ca~aoM kI AiQak saik`yata
ivaYaya vastu ka AiQagama
kma samaya maoM AiQak jaanakarI P`aaPt krnaa
Ca~aoM pr P`aBaava.
³5´ Apnao iptajaI kao p~ ilaKkr Avagat kraeÐ ik Aap P`aqama sa~ kI tOyaarI iksa P`akar
hOM.
kr rho
³6´ dao Ca~aoM ko maQya ga`IYmaavakaSa ibatanao ko ivaYaya maoM hu[- baat–caIt kao saMvaad $p maoM ilaiKe.
³7´ baOMk sao p`aPt haonao vaalaI AakYa-k sauivaQaaAaoM ko ilae iva&apna tOyaar kIijae.
³8´ ide gae ica~ ka 25- 30 SabdaoM maoM vaNa-na kIijae .
SOCIAL SCIENCE
“Preparation through education is less costly than learning through tragedy.”
-Max Mayfield
Keeping the above statement in mind, prepare a project on Disaster Management as per the
following guidelines issued by CBSE:1. Highlight the following:






Definition of „Disaster‟.
What is disaster management cycle?
What is a „Hazard‟?
-How is it classified?
Differentiate between hazard and disaster.
Contrast and compare physical, chemical and biological hazard.
2. Make a Project on Disaster Management on the following:
Roll No.




Topic
1-11
12-22
23-33
34-45
3. Enumerate the following in your project:





Meaning
Impact
Causes
Prevention and mitigation measures
Impact on national economy
Earthquake and fire accident
Landslides and Air Accident
Floods and Rail or Road accident
Drought and Terrorist attack
4. General Instructions:
 The project should be hand written.
 It should be well presented, researched, and pictorial.
 Cover page, table of contents, acknowledgements, bibliography, headings and sub – headings
are a must.
 Each section should be done on white/colored A4 sized sheets.
 The project should be presented in a file and must be supported with newspaper clipping,
collage work, internet material, magazine articles and photographs.
 The project should not exceed 15 pages.
SUBJECT-MATHEMATICS
1. Assignments uploaded on school ERP system (SMS) , students need to do it in school
notebook .
SUB: ENGLISH
I. ANSWER THE FOLLOWING QUESTIONS OF THE NOVEL, „THREE MEN IN A
BOAT‟.
NOTE: The following answers are to be written in a separate note book. Illustrate the scenes as
well.
1. How did the three friends reach a conclusion that they were over-worked and needed a leisure trip?
2. What does the narrator remark about the chief traits of his dog Montmorency?
3. What similarities does the narrator find in the personalities of Harris and Uncle Podger?
4. How do Harris and George pack the hampers?
5. Harris and Jim became the subject of fun for the onlookers. How?
6. How does Harris narrate the incident of his getting lost in the maze at Hampton court?
7. How does the narrator emphasize that very delicate and expensive dresses while on a boating trip
can spoil the fun of the trip?
8. How does the narrator reveal that Harris completely lacks the talent of singing comic songs?
9. Why does the narrator consider the tow-line to be nuisance?
10. How was it difficult for the three friends in the boat to cover the boat with canvas?
II. Complete each joke by writing one of the conjunctions from the box. Each conjunction is
used more than once.
and
because
but
or
so
1. Teacher: “Where is the English Channel?”
Student: “I don‟t know. We don‟t have cable, __________ we only get the local stations.”
2. How do you know that the moon prefers clear nights?
. . . __________ when the clouds disappear, the moon beams
3. What coat has no zipper __________ buttons __________ must be put on wet?
. . . a coat of paint
4. Which are the most mathematical bugs?
. . . Mosquitoes. They subtract from pleasure, add to misery, divide your attention,
__________ multiply rapidly.
5. Mother: “Why are animal crackers spread all over the table?”
Child: “I‟m searching them.”
Mother: “For what?”
Child: “The box says you shouldn‟t eat them if the seal is broken.
. . . ________, I‟m looking for the seal.”
III. Complete the following passage with suitable words.
Pampore, a small town (a)……………………… the banks of the river Jhelum, near Srinagar, is the
main centre (b)…………………………saffron cultivation in India. The best safforn
(c)…………………….. from Spain, which is the world‟s largest producer. Saffron, the
(d)…………………………………….. spice in the world, is lnown as „kesar‟ in
(e)……………………………….. part of India. It adds a golden colour to food and gives
it (f)…………………… unique flavour. Moreover, (g)………………………………….. saffron goes
a long way – for example (h)…………………………… half a teaspoon is sufficient to flavour a litre
of kheer.
IV. Look and the words and the phrases given below and rearrange them to form
meaningful sentences.
The first one has been done for you.
a) the/Indian/English/ exploited/the/farmers
The English exploited the farmers.
b) pay/the/had to/poor farmers/high taxes/very
………………………………………………………………………………………………………
c) natural disasters/farmers/share of taxes/even/pay/their/in times of/the/had to
………………………………………………………………………………………………………