DELHI PUBLIC SCHOOL

HOLIDAY ASSIGNMENT 2019

Question 1. You are Sujal /Sujata of Pragya Public School , Nagalfor fifty students to Nanital in summer vacationsThe arrangements done by the travel agency were far below standard .The accommodationfacilities were inferior in quality .Write a letter of complaint to the director of the agency to stop duping tourists with false promises as it tarnishes the image of locals.OR India is a highly populated country. People lackresult they suffer from various diseases . India has a serious sanitation challenge; around 60 per cent of the world’s open defecation takes place in India. Poor sanitation causes health hazards including diarrheoa, particularly in children under 5 years of age, malnutrition and deficiencies in physical development and cognitive ability.You are Nitish /Nikita, head boy/girl of Anand Public School, Jaipur. Write a letter to the editor ofpractical ways to ensure public sanitation and the right to dignity and privacy. (100marks)

DELHI PUBLIC SCHOOL SAIL TOWNSHIP, RANCHI

HOLIDAY ASSIGNMENT 2019-2020

CLASS- X

ENGLISH

You are Sujal /Sujata of Pragya Public School , Nagal ,Punjab who had arranged a trip for fifty students to Nanital in summer vacations for ten days with ‘Mount Travels and Tourism ’ The arrangements done by the travel agency were far below standard .The accommodation

quality .Write a letter of complaint to the director of the agency to stop duping tourists with false promises as it tarnishes the image of locals. (100-120 words 8 marks)

India is a highly populated country. People lack in maintaining proper sanitation and hygiene as a result they suffer from various diseases . India has a serious sanitation challenge; around 60 per cent of the world’s open defecation takes place in India. Poor sanitation causes health hazards including

n children under 5 years of age, malnutrition and deficiencies in physical development and cognitive ability.You are Nitish /Nikita, head boy/girl of Anand Public School, Jaipur. Write a letter to the editor of a national daily, highlighting the problem apractical ways to ensure public sanitation and the right to dignity and privacy. (100

,Punjab who had arranged a trip with ‘Mount Travels and Tourism ’

The arrangements done by the travel agency were far below standard .The accommodation and food quality .Write a letter of complaint to the director of the agency to stop

120 words 8 marks)

nitation and hygiene as a result they suffer from various diseases . India has a serious sanitation challenge; around 60 per cent of the world’s open defecation takes place in India. Poor sanitation causes health hazards including

n children under 5 years of age, malnutrition and deficiencies in physical development and cognitive ability.You are Nitish /Nikita, head boy/girl of Anand Public School,

a national daily, highlighting the problem and suggesting practical ways to ensure public sanitation and the right to dignity and privacy. (100-120 words, 8

Question 2. Develop a short story with the help of the given visual / starting line .Give a suitable title to your story. (150-200 words) 10 marks

A.

OR B. It was an amazing day , full of fun and frolic. We all stood aghast to see a strange flying object over our heads. We started guessing …(write in 150-200 words) 10 Marks Question 3. Fill in any four of the blanks choosing the most appropriate option from the ones given in the box . Write the answers in your answer –sheet against the correct blank numbers. (1×4 = 4 marks) 1. Butterflies are abundant( a) ___________the Central African Republic. 2. It (b)____________ home to nearly 600 identified species. 3. Many butterflies are brilliantly coloured and small ____( c) some are as big as saucers. 4. Farmer Philippe (d ) _____solace in collecting butterfly wings from his fields and turning them into works of art . 5. My favourite hobby , since my childhood, is __________(e) butterflies. 1. (a ) (i) in (ii) from (iii) for (iv) into 2.(b ) (i) has (ii) is (iii) was (iv) are 3.(c ) (i) if (ii) therefore (iii) so (iv) while 4.(d ) (i) find (ii) to find (iii) finding (iv) finds 5.(e) (i) catch (ii) caught (iii) catching (iv) has been catching Question 4. In the following passage one word has not been edited in each line .Write the incorrect word along with the correct word in the space provided . Do any four (4 marks) incorrect correct In Himalayas ,the desert is turning green . e.g. the a Climate change in a Indian region of a) ______ ______ Ladakh has shrunk glaciers or has made rainfall b) ______ ______ and temperature unpredictable. Water has c) ______ ______ needed to irrigating the fields . d) ______ ______ Farmers may requiring aid from the government. e) ______ ______

Question 5. Rearrange any four of the following word or phrases to make meaningful sentences. (4 marks ) i. enters / millions tons / the/ every year / of / ocean /plastic ii. are / waters/ sightings / junk – filled /of /common iii. population / middle-class / increasing / is / coastlines / along iv. trash/ increase/ has led / waste management/lack/of/in / to v. close/like/ others/ helping/my/friends (Literature) 30 MARKS Question 6. Read the extracts given below and answer the questions that follow.(1×4 = 4marks) A. The moon was coming up in the east, behind me, and stars were shining in the clear sky above me. There wasn’t a cloud in the sky. I was happy to be alone high up above the sleeping countryside. Questions : i. Who narrates the above lines? ii. Which type of weather conditions are being discussed in the above lines? iii. Explain the term ‘the sleeping countryside’? iv. Why is the narrator happy? OR B. At about the age of twenty five, the Prince, thereof shielded from the sufferings of Questions : the world, while hunting out glanced upon a sick man, then an aged man, then a funeral procession, and finally a monk begging for alms. These sights so moved him that he at once became a beggar and went out into the world to seek enlightenment concerning the sorrows he had witnessed. i. Whose age has been referred here? ii. What was the effect of sights on the prince? iii. How did witnessing sorrow change him? iv. What does ‘ glance’ imply in the given lines? Question 7. Answer any four of the following questions in 30-40 words each (2×4 = 8 Marks) i. Hari Singh is both a thief and a human being. Explain. ii. How does the necklace change the course of the Loisel’s life? iii. Explain the qualities of the post office employees? iv. Why would you not agree with Lencho calling them ‘a bunch of crooks’? v. Bholi’s heart was overflowing with a ‘New hope and a new life’. What does the phrase ‘ the new hope and the new life’ mean? Question 8. Attempt any one out of two long answer type questions in (100-120 words , 8 marks) A. People should always try to live within their means. Aspirations have no limits but one should never forget the ground realities. Elaborate on the basis of chapter, “The Necklace”. OR B. Simple moment proves to be very significant and saves rest of the day of poet from being wasted. Explain on the basis of the poem ‘Dust of Snow’.

MATHEMATICS

SURFACE AREA AND VOLUME

1. An iron pillar has some part in the form of a right circular cylinder and remaining in the form

of a right circular cone. The radius of the base of each of cone and cylinder is 8 cm. The

cylinderical part is 240 cm high and the conical part in 36 cm high. Find the weight of the pillar

if one cu. cm of iron weighs 7.8 grams.

2. An open container made up of a metal sheet is in the form of a frustum of a cone of height

8 cm with radii of its lower and upper ends as 4 cm and 10 cm respectively. Find the cost of oil

which can completely fill the container at the rate of Rs. 50 per litre. Also, find the cost of metal

used, if it costs Rs. 5 per 100 cm2.

3. A building is in the for of a cylinder surmounted by a hemispherical dome as shown in the

figure. The base diameter of the dome is equal to of the total height of the building. Find the

height of the building, if it contains of air.

4. The diameter of a sphere is 28 cm. Find the cost of painting it all around at Rs. 0.10 per

square cm.

5. The perimeter of one face of a wooden cube is 20 cm. Find its weight if 1 cm3 of wood weighs

8.25 g.

6. The radii of two cylinders are in the ratio of If the volumes of two cylinders be same, find the

ratio of their respective heights.

7. If the radius of the base of a cone is doubled keeping the height same. What is the ratio of the

volume of the larger cone to the smaller cone?

8. If the length, breadth and height of a solid cube are in the ratio 4 : 3 : 2 and total surface area is

832 cm2. Find its volume.

9. Three cubes of a metal whose edges are in the ratio 3 : 4 : 5 are melted and converted into a

single cube whose diagonal is Find the edges of the three cubes.

10. A solid toy is in the form of a hemisphere surmounted by a right circular cone. The height of

the cone is 4 cm and diameter of the base is 8 cm. Determine the volume of the toy. If the cube

circumscribes the toy, then find the difference of the volumes of the cube and the toy. Also,

find the total surface area of the toy.

11. A circular tent is cylinderical up to a height of 3 m and conical above it. If the diameter of the

base of the cone and cylinder is 105 m and the slant height of the conical part is 53 m, find the

total canvas used in making the tent.

12. A solid composed of a cylinder with hemispherical ends. if the whole length of the solid is

108 cm and the diameter of the hemispherical end is 36 cm, find the cost of polishing its

surface at the rate of 70 paise per square cm.

13. A 5 m wide cloth is used to make a conical tent of base diameter 14m and height 24m. Find the

cost of cloth used at the rate of Rs. 25 per metre.

14. A girl empties a cylinderical bucket, full of sand, of base radius 18 cm and height 32 cm, on

the floor to form a conical heap of sand. If the height of this conical heap is 24 cm, then find its

slant height correct up to one place of decimal.

15. The largest possible sphere is carved out of a wooden solid cube of side 7 cm. Find the volume

of the wood left.

AREA RELATED TO CIRCLE

1. The area of a n equilateral triangle is 49 cm2. Taking each angular point as centre, circles

are drawn with radius equal to half length of the side of the triangle. Find the area of triangle not

included in the circles.

2. ABDC is a quadrant of a circle of radius 14 cm and a semi-circle is drawn with diameter BC. Find

the area of the shaded region.

3. Four equal circle are described about the four corners of a square so that each touches two of the

others. Find the area of the enclosed region, each side of the square measuring 14 cm.

4. A play ground is in the form of a rectangle having semi-circles on the shorter sides . Find its area

when the length of the rectangular portion is 38 m and the breadth is 10 m. [use ̟ = 3.14]

5. A bicycle wheel makes revolutions per minute to maintain a speed of 8.91 km per hour. Find

the diameter of the wheel.

6. From a rectangular region ABCD with AB = 20 cm, a right triangle AED with AE = 9 cm and DE =

12 cm, is cut off. On the other end, taking BC as diameter, a semi-circle is added on outside the

region. Find the area of the region.

7. Two concentric circles with centre O, have radii 21 cm and 42 cm. If angle made by the sector

∠AOB = 60°, find the area of the region enclosed between the two circle.

8. A chord of a circle of radius 20 cm subtends an angle of 90° at the centre. Find the area of the

corresponding major segment of the circle.

9. Area of a sector of a circle of radius 36 cm is 54̟ cm2. Find the length of the corresponding arc of

the sector.

Q.2. The radii of two circles are 8 cm and 6 cm respectively. Find the radius of the circle having area

equal to the sum of the areas of the two circles.

11. A calf is tied with a rope of length 6 m at the corner of a square grassy lawn of side 20 m. If the

length of the rope is increased by 5.5 m, find the increase in area of the grassy lawn in which the calf

can graze.

12. A circle is inscribed in an equilateral triangle ABC of side 12 cm. Find the radius of the inscribed

circle and the area of the shaded region. [Use ̟ = 3.14 ]

13. In a circular table cover of radius 70 cm, a design is formed leaving an equilateral triangle ABC in

the middle . Find the total area of the design.(4 marks)

Q.4. The wheels of a car are of diameter 80 cm each. How many complete revolutions does each

wheel make in 10 minutes when the car is travelling at a speed of 66 km per hour?

15. A sheet of paper is in the form of a rectangle ABCD in which AB = 40 cm, and BC = 28 cm. A

semi circlular portion with BC as diameter is cut off. Find the area of the remaining paper.

CONSTRUCTION

1.Construct an isosceles triangle whose base is 9 cm and altitude is 8 cm. Then construct another

triangle whose sides are of the corresponding sides of the first isosceles triangle.

2. Draw a line segment AB of length 7 cm. Taking A as centre draw a circle of radius 3 cm and

taking B as centre, draw another circle of radius 2.5 cm. Construct tangents to each circle from the

centre of the other circle.

3. Construct a ∆ABC in which BC = 6.5 cm, AB = 4.5 cm and ∠ABC = 60°. Construct a triangle

similar to this triangle whose sides are of the corresponding sides of the ∆ABC.

4. Draw a right triangle in which sides (other than hypotenuse) are of lengths 8 cm and 6 cm. Then

construct another triangle whose sides are times the corresponding sides of the first triangle.

5. Construct a triangle with sides 4 cm, 5 cm and 7 cm. Then construct a triangle similar to it whose

sides are of the corresponding sides of the given triangle.

6. Construct a ∆ABC in which AB = 6.5 cm, ∠B = 60° and BC = 5.5 cm. Also construct a triangle

AB’C’ similar to ∆ABC whose each side is times the corresponding side of the ∆ABC.

7. Draw a ∆ABC with side BC = 6 cm, AB = 5 cm and ∠ABC = 60°. Construct ∆AB’C’ similar to

∆ABC such that sides of ∆AB’C” are of the corresponding sides of ∆ABC.

8. Construct a triangle whose perimeter is 13.5 cm and the ratio of the three sides is 2 : 3 : 4.

9. Draw a circle of diameter 6.4 cm. Then draw two tangents to the circle from a point P at a distance

6.4 cm from the centre of the circle.

10. Draw a circle of radius 3.4 cm. Draw two tangents to it inclinded at tn angle of 60° to each other:

11. Draw ∆ABC in which AB = 3.8 cm, ∠B = 60° and median AD = 3.6 cm. Draw another triangle

AB’C similar to the first such that

12. Draw an equiliateral triangle of height 3.6 cm. Draw another triangle similar to it such that its

side is of the side of the first.

13. Draw an isosceles ∆ABC, in which AB = AC = 5.6 cm and ∠ABC = 60°. Draw another ∆AB’C’

similar to ∆ABC such that sides are in the ratio 2/3.

14. Draw a triangle ABC with side BC = 6 cm, AB = 5 cm and ∠ABC = 60°. Then construct a triangle

whose sides are 3/4 of the corresponding sides of the triangle ABC.

15. Construct a tangent to a circle of radius 4 cm from a point on the concentric and measure its

length. Also verify the measurement by actual calculation.

SCIENCE

PHYSICS

1. Size of image of an object by a concave mirror having a focal length of 20 cm is observed to be reduced

to 1/ 3rd of its size. At what distance the object has been placed from the mirror? What is the nature of

the image and the mirror?

2. Draw ray diagrams showing the image formation by a concave mirror when an object is placed-

(a) between pole and focus of the mirror(b) between focus and center of curvature of the mirror(c) at

center of curvature of the mirror(d) at infinity.

3. a) State Snell’s law of refraction. (b) When a ray of light travelling in air enters obliquely into a glass slab, it is observed that the light ray emerges parallel to the incident ray but it is shifted sideways slightly. Draw a ray diagram to illustrate it.

4. A 10 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 30 cm. The distance of the object from the lens is 20 cm. Find the: (a)Position (b)Nature (c)Size of the image formed.

5. What is meant by the power of a lens? What is its SI unit? Name the type of lens whose power is positive. The image of an object formed by a lens is real, inverted and of the same size as the object. If the image is at a distance of 40 cm from the lens, what is the nature and power of the lens? Draw ray diagram to justify your answer

6. Define magnification produced by a spherical mirror in terms of height of a object and image. How is it related to object and image distance? Explain why magnification is positive for virtual image and negative for real image

7. A 6 cm object is placed perpendicular to the principal axis of a convex lens of focal length 15 cm. The distance of the object from the lens is 10 cm. Find the position, size and nature of the image formed, using the lens formula.

8. If the image formed by mirror for all positions of the object placed in front of it is always virtual and diminished, state the type of the mirror. Draw a ray diagram in support of your answer. Where are such mirrors commonly used and why?

9. A student has three concave mirrors A, B and C of focal lengths 20 cm, 15 cm and 10 cm respectively. For each concave mirror he performs the experiment of image formation for three values of object distance of 30 cm, 10 cm and 20 cm. For the three object distances, identify the mirror which will form an image equal in size to that of object. Find at least one value of object distance.

HOTS 10. Lower half of a convex lens is covered with a black paper.

(a)Show the formation of image of an object placed at 2F1, of such covered lens with the help of ray diagram. Mention the position and nature of image. (b)Draw the ray diagram for same object at same position in front of the same lens, but now uncovered. Will there be any difference in the image obtained in the two cases? Give reason for your answers.

11. A convex lens has focal length 20 cm in air; find its focal length in a liquid of absolute refractive index 4/3 where the absolute refractive index of material of lens is 3/2. Does the focal length of concave mirror changes when it is immersed into a liquid?

12. What happens to the focal length of a lens if red colours of light are replaced with green colour of light?

CHEMISTRY

1. Explain- Radius of Na cation is less than that of Na atom.

2. How does metallic and nonmetallic character vary on moving from left to right in a period.

3. Write the drawbacks in Mendeleev periodic table that led to its modification

4. In what manner is long form of periodic table better than Mendeleev periodic table? Explain- with example’s.

5. Justify the given statement with example that “ the properties of the elements are periodic function of their atomic number.

6. What is periodic table? Name the scientist who stated the modern periodic law.

7. What do you understand by atomic size? State its unit.

8. An element X belongs to 4th period and 17th group of periodic table. State –(i) number of valence electrons in it. (Ii) Name the family to which it belongs. (Iii) Write the formula of the compound formed when it reacts with Y having atomic number 13 and mass no 27.

9. The nucleus of an atom contains 9 protons. Find the valency of this atom.

10. How does electronic configuration of an atom relate to its position in the Modern periodic table?

MANAGEMENT OF NATURAL RESOURCES

1. List two causes of pollution of river Ganga.

2. What is the purpose of sustainable development?

3. List two advantages of building large dams.

4. Why are forests considered as biodiversity hotspot?

5. List four measures to conserve forests.

6. List four advantages of water stored in the ground as “ground water”.

7. Define: a) 3Rs b) Anaerobic Degradation

8. List three problems caused due to construction of large dams.

9. List three methods for conservation of water resources.

10. Describe traditional systems of water harvesting.

11. Why natural resource should be used judiciously ?

12. Write advantage of using underground water?

13. What is coliform?

14. Write about the stake holders of forest?

15. Mention disadvantages of using excess coal and petroleum?

BIOLOGY

Group -A

Q.1 What are the impact of variation in survival and evolution?

Q.2 What do you mean by pheno and geno type? Give some example.

Q. 3 Define homo and heterozygous ? give example.

Q.4 Which is the essence of evolution?

Q.5 Write the name of closest ancestor of Human .

Group - B

Q. 1 Differentiate between Homologous and analogous organ with example.

Q.2 What are fossils? Write the name of any one connecting link, Missing link, vestigial organ

( human).

Q.3 (i)Show the result of hybridization up to F2 generation where Homozygous round and yellow

seeded pea plant cross with homozygous wrinkle and green seeded pea plant.

(ii) Indicate the type of hybridization, genotype of every generation, Pheno and geno typical

ratio.

(iii) Mention the Mendelian principle in above hybridization.

Q.4 (i) Define Incomplete and Co-dominance with example.

(ii) when one heterozygous A blood group man marries a women with homozygous B blood

group then find out the probability of the different blood group of their sons or daughter.

Q.5 (i)What do you know about theory of abiogenesis [ Chemosynthetic theory of evolution] and

write the name of scientist who experimentally prove it?

(ii) Explain Charles Darwin’s Natural selection with example.

OUR ENVIRONMENT

Q1. What is biomagnifications ?

Q2. What is a trophic level? What limits the number of trophic level in a food chain?

Q3. Why crop fields are known as artificial ecosystem?

Q4. Write the common food chain of a pond ecosystem.

Q5. Explain the role of decomposers in the environment.

Q6. Differentiate between food chain and food web.

Q7. Why is improper disposal of waste a curse to environment?

Q8. Indicate the flow of energy in an ecosystem. Why is it unidirectional? Justify.

Q9. Why an aquarium needs to be cleaned regularly while a pond need not to be cleaned?

Q10. What do you mean by 10% law?

HISTORY

1. What conditions in the Balkan areas led to world war I?

2. Explain the statement "When France sneezes the rest of Europe catches cold."

3 Through the focus on any two countries explain how nations developed over the 19th century

4. "Nationalism spreads when people begin to believe that they are all part of the same nation " Support

the statement by explaining about the variety of cultural processes in India which helped to develop a

sense of collective belonging among Indians

5. Why did Mahatma Gandhi find 'salt' a powerful symbol that could unite the nation? Write a note

about the salt march and the events which led to it.

POLITICAL SCIENCE

1. Describe the various party systems existing in different countries. Which party system is suitable for

India? Why?

2. How are political parties recognised as regional and national parties in India?

3. Mention any five regional parties with the region and symbol

4. What outcomes are expected of a democracy?

5. "Democracy is a better form of government than any other form of government" Analyse the statement

with arguments.

GEOGRAPHY

1. What is the manufacturing sector? Why is it considered the backbone of development? Interpret the

reasons.

2. How does textile industry occupy a unique position in Indian economy? Explain any three points.

3. “The sugar mills are shifting towards southern and western states of India.” Support the statement with

three reasons.

4. Explain with examples the conditions responsible for uneven distribution pattern of the railway network

in India.

5. Why is air transport an important means of transport in the north-eastern part of our country? Explain

any five reasons.

ECONOMICS

1. ‘Cheap and affordable credit is crucial for the country’s development’. Explain the statement

with three points.

2. “Most of the poor households are still dependent on informal sources of credit”. Explain the

statement.

3. How have markets been transformed in recent years? Explain with examples.

4. Explain the three conditions that determine MNCs setting a production in other countries.

5. “Foreign trade integrates the markets in different countries.” Support the statement with

arguments.

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iz'u 30- Nk=S% mPPkS% ----------------A

(i) gL;Urs (ii) gLkfUr (iii) ikSjkf.kdk (iv) ikSjkf.kdh

IT ASSIGNMENT (DIWALI VACCATION)

1. Focussing on Importance of Communication Skills, Discuss the difference between Verbal and Non-

Verbal communications.

2. Provide the meaning of below mentioned Self Management Skills : VIZ

� Stress Management

� Self commitment & Self Motivation

� Balanced Diet & Healthy Lifestyle

� Significance of ‘Self ‘in control, Regulation, Confidence, Awareness, Motivational Organization

skills…

3. Import of ICT (Information & Communication Technology Skills)in our modern daily life.

A ‘Random Day’ Exhibition of the 21st Century children. Utility & Tools of I.C.T.

4. Your technical points of difference between “ENTREPRENEURSHIP” and “EMPLOYMENT”.

5. Mention four steps of Entrepreneurship Development Process.

6. Brief discussion regarding GREEN Skills, Actually, Green Skills required for sustainable development

and Green Economy are based on:

(i) Green Skills required for Managing Resource Efficiently.

(ii) Green Skills required for Managing Natural Asset.

Give your precious comments and information on these points.

7. Define Journal Entry. List the activities that can be automatically recorded under Journal Entry.

8. Define the following in Database :

a) Relation, Degree

b) Cardinality

c) Tuple

d) attribute

Write the concept of keys in database.

9. Mention at least 4 points to be kept in mind to make an effective Presentation for the audience.

10. Write a Query to Create a RELATION(Table) in the structure given below

Table Name: Product.

Field Data Type

P_ID Char(4)

P_Name Varchar(20)

Description Varchar(40)

Price Decimal

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