BRAIN INTERNATIONAL SCHOOL
WINTER HOLIDAYS HOMEWORK(2016-17)
CLASS-IX
ENGLISH
Instruction: Attempt all the given questions in the writing skills Notebook.
Main Course Book: Unit
1. Read a Mystery about Bermuda Triangle from Page Numbers 82-87 and write its
summary highlighting the important facts about it.
Writing Skills
a) You went to see the IPL match where your favourite team won the match and
entered into the semi finals. Write a diary entry expressing your feelings.
b) Write an article to be published in your school magazine, in about 120 words
on the topic “The Culture and Traditions of India”.
c) Read the lines given below and continue the story. Give it a logical conclusion
in about 150-200 words.
Once there lived a king called Jai Singh. He was very wise and famous for
his justice. People from far away came to him for justice. One day two
women came to his palace.
Novel : Gulliver travels
1. What was Gulliver’s initial reaction about the struldbruggs of Lugganng? Why did
he eventually wish not to become immortal?
2. Cite some examples of Satire in Gulliver’s Travel.
3. Attempt character sketches of :
d) Gulliver
e) lord munodi
f) laputans
g) slameckson
ihMdI
‘jala saMrxaNa’ ivaYaya pr ek paosTr banaaeÐ. (FA4)
MATHS
1. Read both the texts of OTBA, based on quadrilaterals. Try doing questions based on
both the themes.
2. Do the following questions from the reference book (RS Aggarwal) based on chapter
CIRCLE
Exercise -11A Q1 to Q 7
Exercise -11B Q1 to Q14
Exercise - 11 C - Q1 to Q15
SCIENCE
1. Do the given assignments.
Chemistry
Atoms and Molecules
1.
State any two laws of chemical combination.
2.
Define molecular mass of an atom.
3.
What is meant by atomicity? Explain with two examples.
4.
What is the atomicity of the following: (a) Oxygen (b)Ozone (c) Neon (d) Sulphur (e)
Sodium?
5.
Explain the difference between 2N and N2.
6.
Calculate the molecular mass of Chloroform (CHCl3),Nitric Acid(HNO3).
7.
Calculate the number of iron atoms in a piece of iron weighing 2.8g.
8.
What is the number of molecules in 0.25moles of oxygen?
9.
Convert 12.044 × 1022 molecules of sulphur dioxide into moles.
10.
What is the number of water molecules contained in a drop of water weighing 0.06g?
Structure of Atom
1.
Find the number of protons and neutrons in
.
2.
Find the number of nucleons in
3.
What are cathode rays? What is the nature of charge on cathode rays?
4.
(a)
Describe Bohr’s model of the atom. How did Neils Bohr explain the stability of
atom?
(b)
An element has an atomic number 11 and its mass number 23.What is the
arrangement of electrons in the shells?
5.
Write down the formulae of : (i) Sodium Oxide (ii) Aluminium Chloride (iii) Sodium
Sulphide
6.
An element has 2 electrons in the M shell. What is the atomic number of the element?
7.
An element has Z =7.What is the valency of the element? Also name the element.
8.
Write the applications of radioactive isotopes.
9.
Which two of the following atomic species are isotopes of each other and which two are
isobars :
10.
What is meant by (a) atomic number (b) mass number, of an element? Explain with the
help of an example.
PHYSICS
Work and Energy
1.
What is Archimedes’ principle?
2.
Explain the concept of floating.
3.
The volume of a 500 g sealed packet is 350 cm3. Will the packet float or sink in water
if the density of water is 1 g cm–3? What will be the mass of the water displaced by
this packet?
4.
What is the work to be done to increase the velocity of a car from 36 km h–1 to
54 km h–1 if the mass of the car is 1500 kg?
5.
Find the energy possessed by an object of mass 10 kg when it is at a height of 10 m
above the ground.
6.
A lamp consumes 2000 J of electrical energy in 10 s. What is its power?
7.
What is commercial unit of energy?
8.
In a building 4 fans of 100W run for 8 hours, 10 LED of 15W run for 8 hours and
4AC of 1500W run for 4 hours. Calculate the electricity bill for the month of august if
the cost of one unit is Rs.8.
9.
What is the conservation of energy?
10.
What is the work energy theorem?
Sound:
1.
Explain how sound is produced by your school bell.
2.
Why are sound waves called mechanical waves?
3.
A person is listening to a tone of 500 Hz sitting at a distance of 450 m from the source of
the sound. What is the time interval between successive compressions from the source?
4.
Distinguish between loudness and intensity of sound.
5.
An echo returned in 3 s. What is the distance of the reflecting surface from the source,
given that the speed of sound is 342 m s−1?
6.
What is the range of frequencies associated with(a)
Infrasound
(b)
Ultrasound?
7.
Cite an experiment to show that sound needs a material medium for its propagation.
8.
Why is sound wave called a longitudinal wave?
9.
A person has a hearing range from 20 Hz to 20 kHz. What are the typical wavelengths of
sound waves in air corresponding to these two frequencies? Take the speed of sound in air
as 344 m s−1.
10.
Give two practical applications of reflection of sound waves.
Biology
1.
List any two features of phylum vertebrata. Name the kingdom to which blue green algae
and mushroom belong?
2.
What is a vaccine? Name any two vaccines.
3.
What does AIDS stand for? Name the system of the body affected by it.
4.
Name the microorganism which causes:
5.
Explain why does penicillin help in fighting bacterial diseases but not viral diseases?
6.
Ramesh went to National Botanical Garden and saw the scientific names of many plant
(i)
Elephantiasis (ii)
Cholera
species written there.
(a)
List the conventions used to write the scientific names of plants or animal species.
(b)
Write the scientific name of Lotus.
7.
Dr. Ravi actively organizes awareness programmes for prevention of malaria. He visits
nearby villages and enlightens them about its spread and prevention.
(i)
Name the method of transmission of malaria.
(ii)
How can we prevent the spread of this disease?
(iii)
Mention the values exhibited by Dr. Ravi.
8.
What is inflammation? Why do lichens not occur in Delhi but commonly in Shimla?
9.
Why are bryophytes called amphibians of plant kingdom?
10.
Why does the female mosquito feed on the human blood?
11.
Which bacterium causes peptic ulcers? Who discovered this pathogen for the first time?
12.
What are vectors? Give two examples.
13.
How do bacteria protect themselves? How is rabies virus spread?
14.
Name the following:
15.
(i)
The protozoan causing sleeping sickness.
(ii)
The bacterium that causes acne.
(iii)
The worm that causes Elephantiasis.
(iv)
The worm that causes Ascariasis.
(v)
The protozoan causing Kala-azar (black fever).
Write the different methods of disease transmission from an infected person to a healthy
person.
16.
It is not easy to prepare antiviral drugs. Why?
17.
Write one disease spread by direct contact. How can you protect yourself from this
disease?
18.
How do mosquitoes spread a disease from an infected person to a healthy person? Name
one disease spread by mosquitoes other than malaria.
19.
Balanced diet is necessary for maintaining healthy body. Why?
20.
Why is AIDS considered to be a syndrome but not a disease?
21.
Name the target organs for the following diseases:
(i)
Hepatitis
(ii)
Pneumonia
(iii)
Fungal disease
(iv)
Japanese encephalitis
SOCIAL SCIENCE
1. Prepare a signboard to keep water bodies clean. Students may work in groups to prepare a
signboard. The work can be done on a chart paper pasted on a mountboard. Some
illustrations on aquatic system may be given in the background and the rules may be
written on the Bullet points. Points to be mentioned should pertain to conservational
measures.
2. Do the assignment in the notebook.
FRENCH
Task 1: You are a journalist for the newspaper “L’OR BLANC. Make a comic strip on an A4
size colored/ white sheet based on theme- La conservation de l’eau (Conservation of water)
A comic strip should have original idea to conserve water etc. Use colored/white paper (A4)
Support your work with image, photos, and illustrations.