HOLIDAY HOMEWORK (2020-2021)

CLASS IX

ENGLISH

1. ‘WFH’…aren’t you pretty familiar with this term now? Well, circumstances often prove to be a

great teacher. ‘Work From Home’ is what your parents have been doing in the recent past.

Interview your parents about this concept and present the same as a questionnaire with their

answers.

2. Across the last month and a half, along with your online classes, you must have learnt a new

skill or developed your hobby or recorded a song or donned your dancing shoes or baked/cooked

something new...Write a letter to your grandparent detailing the same.

3. What’s a vacation without having read some books? You might have read it on the Internet or

rummaged through your shelves and chanced upon some old comics/ short stories. Pour out your

thoughts as a write-up on any specific book of your choice.

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MATHEMATICS

Make a project file on the following activities:

1. Square root spiral : Draw the square root spiral up to √10 to depict a beautiful design.

2. Vertically opposite angles, Co interior angles, Corresponding angles : show the properties

of the pairs of angles formed by parallel lines and a transversal by cutting and pasting origami

sheets innovatively.

3. Angle sum property of Triangles : prove the angle sum property of triangles by arrangement

of toothpicks/ matchsticks.

4. Isosceles angle property: prove that angles opposite to the equal sides of a triangle are equal

by folding origami sheets. Paste the folded sheet in your file.

5. To obtain the mirror image of a plane geometrical figure: use graph paper, coloured sheets

and geometry box to show the mirror image of a geometrical shape (for example: a

quadrilateral) on the Cartesian plane.

Maths Assignment (to be done in maths Set A notebook)

Q1. Every whole number is a natural number write true or false.

Q2. If find the value of x2 + y2 + xy.

Q3. If find the value of x2 - y2.

Q4. Determine rational numbers p and q if

Q.5. Simplify:

Q.6. Simplify:

Q.7. Show that:

Q. 8. If: then find the value of qx2 – 2px + q.

Q. 9. Show that:

Q.10. If 2a = 3b = 6c then show that

Q.11. If then find the value of

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SCIENCE

PART A – Project work

Make a detailed project report covering the following:

● What is COVID -19 and what is its causative agent?

● What does COVID -19 stands for?

● What are the symptoms of COVID -19?

● Are antibiotics effective in preventing or treating COVID -19? Give reason for your answer.

● Why vaccine for COVID -19 is difficult to prepare and taking so long?

● What is the difference between self isolation, self quarantine and social distancing?

● How can you protect yourself from the infection of COVID-19?

● What precautions are you taking these days before consuming fruits and vegetables?

● What precautions are you taking while buying groceries and when receiving a delivery at

home these days?

● Can you get infected by COVID-19 through the air?

● How long does the virus survive on surfaces?

● Will taking extra vitamins supplements help against COVID-19 infection?

PART B

BIOLOGY

Q1: Which organelle would you associate with elimination of old and worn out cells ? Why?

Q2: Describe an activity to demonstrate endosmosis and exosmosis. Draw a diagram in

support of the activity.

Q3: a. Draw a plant cell and name seven important organelles found in it.

b. Name one organelle that can make some of its own protein in a plant cell and also

mention one function of such an organelle.

Q4: a) Where are chromosomes located?

b) What are they composed of?

c)What is chromatin material and how does it change just before the cell divides?

d) What is their chemical composition?

e) How many pairs of chromosomes are present in humans?

Q5: Who discovered cell and how? From where do the new cells come?

Q6: Draw a neat diagram of an animal cell and label the following organelles:

a.Plasma membrane b. Golgi apparatus c. Centriole d. Rough endoplasmic reticulum

Q7: Why are mitochondria called Power house of the cell? Give three similarities and one

difference between mitochondria and plastid.

Q8: Put a drop of blood in three type of liquids:

a. Pure water b. Salt solution c. Water containing 0.9% NaCl .

What will happen to the blood drop and why? Explain your answer.

Q9. What is membrane biogenesis? How does it takes place?

Q10: Classify the following into osmosis/diffusion:

(a)Swelling up of a raisin on keeping in water.

(b)Spreading of virus on sneezing

(c)Earthworm dying on coming in contact with common salt.

(d)Shrinking of grapes kept in thick sugar syrup. (e) Preserving pickles in salt.

(f) Spreading of smell of cake being baked throughout the house

(g) Aquatic animals using oxygen dissolved in water during respiration.

PHYSICS

Q1: Under what condition is the magnitude of average velocity of an object equal to its

average speed?

Q3: What is the acceleration of a body moving with uniform velocity?

Q4: A body can have zero average velocity but not zero average speed. Justify.

Q5: A train 100m long is moving with a velocity of 60km/h. Find the time it takes to cross the

bridge1km long.

Q6: A bus starts from rest and moves with a uniform acceleration of 1m/s2 for 5 minutes.

Calculate

(i) the speed acquired and (ii) the distance travelled by the bus.

Q7: If a cheetah spots his prey at a distance of 100m, what is the minimum time it will take to get

its prey if the average velocity attained by it is 90km/h?

Q8: Draw a velocity versus time graph of a stone thrown vertically upwards and then coming

downwards after attaining the maximum height. Calculate the total distance travelled by the

stone and its displacement.

Q9: A stone is dropped down a deep well from rest. The well is 50metre deep. How long will it

take to reach the bottom of the well? Given a = 9.8m/s2.

Q10:A cyclist goes around a circular track of diameter 105m in 5minutes. Calculate his speed and

velocity at the end of 7minutes30seconds

CHEMISTRY

Q1: What are intermolecular forces ? How are these related to the three states of matter ?

Q2: Substance ‘A’ has high compressibility and can be easily liquified. It can take up the shape of

any container. Predict the nature of the substance. Enlist four properties of this state of matter.

Q3: Pressure on the surface of a gas is increased. What will happen to the inter particle forces?

Q4: Convert the following temperature to Kelvin Scale (a) 100°C(b) -100 C

Q5: Convert the following temperature to the Celcius scale (a) 25K (b) 373K

Q6: Do we sweat more on a dry day or humid day ? Justify your reason.

Q7: Why do we feel comfortable under a fan when we are perspiring?

Q8: Why do we see water droplets on the outer surface of a glass containing ice cold water?

Q9: Why do the doctors advise to put strips of wet cloth on the forehead of a person having high

fever?

Q10: What will happen to the melting point of ice if some common salt is added to it? Justify your

answer.

HINDI

ग्रीष्मावकाश – कार्य (2020-21)

कक्षा- नवी ीं

1)ह िंदी भाषा के इहि ास को खिंगाहिए, इसकी उत्पहि से वितमान रूप में पहिंचने की यात्रा को 80-100 शब्ोिं में

अनुचे्छद के रूप में हिखखए । ह िंदी की उपभाषाओिं / बोहियोिं की के्षत्र के अनुसार िाहिका भी बनाएँ ।

2) भारि की चारोिं हदशाओिं से एक- एक राज्य चुहनए व उनकी भाषा, वेशभूषा , भोजन, नृत्य -सिंगीि व आने

हवशेषिाओिं का सहचत्र वर्तन करें ।

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SOCIAL SCIENCE

ASSIGNMENT

1. Evaluate the features of Apartheid practised in South Africa between 1948 and 1989.

2. Analyze the working and composition of African National Congress.

3. What efforts were made to form a new Constitution after Independence in South Africa?

4. Give reasons for accepting the Constitution made by the Constituent Assembly of India more

than 70 years ago.

5. “The Central location of India at the head of the Indian Ocean is considered of great

significance ” Explain why.

6. Explain the importance of education in our day to day life with good examples.

7. Why are women employed in low paid work? State any three reasons.

8. Explain the characteristics of the three major divisions of Northern Plains

9. Point out three differences between the Himadri and Himachal range.

10. Enumerate the features of the two island groups of India.

Project work ( To be done in class register only)

Rajasthan is paired with Assam under ‘Ek Bharat Shrestha Bharat programme’. Mutual

understanding is the foundation of India’s strength and all citizens should feel culturally integrated in

all corners of India.

Compare and contrast the partner states on the basis of the following criteria :

➔ Architectural styles

➔ Culinary practices

➔ Art forms and folk dances

➔ Agricultural practises & Per Capita Income

➔ Law and order , Education system and health care facilities

● Do they have some commonality with each other ?

● List some suggestions to strengthen the ties between the two states.

● Design a simple yet creative flag for the states of Rajasthan and Assam .

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