DELHI PUBLIC SCHOOL PARADIP REFINERYdpsparadip.edu.in/wp-content/uploads/2019/04/XII.pdf ·...

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DELHI PUBLIC SCHOOL PARADIP REFINERY

Summer Holiday Assignment 2019-20

CLASS – XII

English

1. Read any one of the books of any one of the following authors :-

a) Anita Desai

b) R.K. Narayan

c) Salman Rushdie

d) Khuswant Singh

e) Amitav Ghosh

2. Then Answer the following questions in an( A-4 SIZE PAPER)

a. Which is the Book you read and by which author?

b. When was the book written ?

c. What was it about ?

d. What was the most interesting thing you liked about the story ?

e. If you had to change anything about the story what would it be and why ?

3. Read the lesson ‟Should Wizard Hit Mommy?‟ from the text book Vistas and answer the following

questions in your English copy :

a. Why did Roger Skunk go to visit the old owl?

b. How did Jo want the wizard to behave when mommy skunk approached him?

c. How does Jo want the story to end and why?

d. What impression do you form of Jack as a father?

e. Why is an adult‟s perspective on life different from that of a child‟s?

f. How did the Roger Skunk‟s mother get his old smell back?

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Mathematics

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ASSIGNMENT ON DETERMINANTS FOR STUDENTS OF DPS PR

Q1 If A =[

], find A-1 . Use it to solve the system of equations 2x -3y +5z = 11

, 3x + 2y - 4z = - 5, x + y - 2z = -3 (AI -2018)

Q.2. If A is a 3x3 invertible matrix , then what will be the value of k if det (A-1) =(det A )k ?(DELHI2017)

Q .3.If A= [

], find A-1 .Using A-1solve the system of equations

=2;

= 5

;

= - 4 (DELHI 2017)

Q.4.Determine the product [

] [

] and use it to solve the system of equations x-y +z =4, x-

2y-2z =9 ,2x+y +3z =1. (AI 2017)

Q.5. Solve for x: |

| = 0, using properties of determinants. (AI 2016)

Q.6.Using properties of determinants, prove that |

| = (a – 1)3(AI 2017)

Q.7. Find the matrix A such that (

) A =(

) (AI 2017)

Q.8.prove that : |

| =(a-b) (b-c)(c-a) (a+b+c)( (AI 2016)

Q.9. prove that : |

| =9y2(x + y) (DELHI2016)

Q.10. Using properties of determinants , prove that : |

| = X3 (AI 2014)

Q.11. Two schools A & B want to award three selected students on the values of sincerity ,truthfulness and helpfulness. The school A wants to award Rs X each, Rs y each, Rs Z each for the three respective values to 3,2 and 1 student respectively ,with a total Rs 1600.School B wants to spend Rs 2300 toward its 4,1 & 3 students .If the total amount of award for one prize of each value is Rs 900,using matrices find the award money for each value. Apart from these values suggest one more value which should be considered for award. (AI 2014 )

Q12. Find the value of x :|

| = 0, using properties of determinants.(CBSE2019)

Q13.If A is a square matrix of order 3,with | | =9, then write the value of | | (CBSE 2019)

Q.14.A is a square matrix of order 3 with | | = 4.then find | | (CBSE 2019)

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Q.15. Find the value of k if |

| =K(x3 + y3) (CBSE 2019)

PHYSICS 1. a) Define Electric dipole moment. Is it a scalar or vector quantity? Write its SI unit.

b) An electric dipole is held in a uniform electric field

i) Show that the net force acting on it is zero. ii) Derive expression for torque acting on it.

2. Two charges +q and -3q are placed on x-axis separated by distance. Where third charge

+ 2q should be placed such that it will not experience any force?

3. i) Define electric flux. Write its SI unit.

ii) Using gauss‟s law, Prove that the electric field at a point due to a uniformly charged infinite

plane sheet is independent of the distance from it.

iii) What is the direction of field if a) sheet is positively charged b) Negatively charged.

4. (a)State the gauss‟s law of electrostatics.

(b) Using gauss‟s law of electros tics find the electric field intensity due to uniformly charged

spherical shell at as point (i) outside the shell (ii) inside the shell.

5. Define an equipotential surface. Draw an equipotential surfaces for

(a) Single positive point charge (b) uniform electric field

(c)System of two identical positive point charges (d) Electric dipole.

6. What is an electric dipole? Derive an expression for the electric field at a point on the equatorial

plane of an electric dipole of length 2a.

7. (a)Define electric field Intensity write its S.I unit.

(b) By using Gauss‟s law of electrostatics to find the electric field due to uniformly charged

infinitely long straight conductor of linear charge density λ.

8. (a) What is meant by electric potential? Write its SI unit.

(b)Derive expression for electric potential due to point charge at point P. Draw a plot showing the

variation of i) electric field (E) ii) electric potential(V) with distance(r) due to point charge.

9. Two charges 5X10-8 C and -3X10-8 C are located 16cm.At what point on the line joining the two

charges is the electric potential is zero?

10. Three point charges +Q, +2Q and -3Q are placed at the vertices of an equilateral triangle ABC of

side „l‟. a) Find the electric potential at centre of the triangle due to these charges.

b) Find the amount of work done to place a charge +q at the centre of the triangle.

11. Derive relation between Electric field (E) and electric potential. Write two important conclusions

drawn from this relation.

12. Define Electrostatic potential energy. Derive expression for potential energy of a dipole placed in

a uniform electric field with neat diagram.

CHEMISTRY

1. Some alkyl halides undergo substitution whereas some undergo elimination reaction on

treatment with bases. Discuss the structural features of alkyl halides with the help of examples

which are responsible for this difference.

2. Some halogen containing compounds are useful in daily life. Some compounds of this class are

responsible for exposure of flora and fauna to more and more of UV light which causes

destruction to a great extent. Name the class of these halo compounds. In your opinion, what

should be done to minimise harmful effects of these compounds.

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3. Why are aryl halides less reactive towards nucleophilic substitution reactions than alkyl halides?

How can we enhance the reactivity of aryl halides? Tert-Butylbromide reacts with aq. NaOH by

SN1 mechanism while n-butyl bromide reacts by SN2 mechanism. Why?

4. Predict the major product formed when HCl is added to isobutylene. Explain the mechanism

involved.

5. Discuss the nature of C–X bond in the haloarenes. How will you obtain monobromobenzene

from aniline?

6. How can you obtain Iodoethane from ethanol when no other iodine containing reagent except NaI

is available in the laboratory?

7. Cyanide ion acts as an ambident nucleophile. From which end it acts as a stronger nucleophile in

aqueous medium? Give reason for your answer. What are the IUPAC names of the insecticide

DDT and benzenehexachloride? Why is their use banned in India and other countries?

8. Elimination reactions (especially β-elimination) are as common as the nucleophilic substitution

reaction in case of alkyl halides. Specify the reagents used in both cases.

9. What is retention of configuration? Give example

10. Explain methylation of chlobenzene and name the reaction?

11. With example explain SN2reactions of optically active halides area accompanied by inversion of

configuration.

12. SN1 reaction of optically active halides accompanied by racemisation. Explain with example?

BIOLOGY

. Describe various vegetative modes of propagation in plants.

2. Differentiate between Oestrus cycle and Menstrual cycle.

3. Draw labelled diagram of macrosporangium showing wall layers and write the role of Tapetum.

4. Describe the process of formation of embryo sac in plants with labelled diagrams.

5. Describe the structure of pollen grain and stigma in wind, water and insect pollinated flowers.

6. What are out breeding devices? Mention three outbreeding devices in plants.

7. Describe Apomixis and Polyembryony with examples.

8. Describe the menstrual cycle in Human female with labelled diagram.

9. Draw female reproductive system and describe their role, including the external genital parts.

10. Make a chart of schematic representation of Spermatogenesis and Oogenesis.

11. Describe the role of Placenta in Human and Describe the different trimesters of pregnancy.

12. (a) Describe different methods of contraception in Human.

(b) Describe different assisted reproductive technologies which can help a couple to have children

13. What is MTP? What is the cause of MTP? What is the misuse of MTP? Explain.

Economics

1. When was TISCO incorporated?

2. Name the first economist who estimated National income and per capita income.

3. Discuss the condition of agriculture on the eve of Independence.

4. Discuss the Industrial sector on the eve of Independence.

5. What happen to foreign trade during the British rule.

6. What do you mean by Demographic transition?

7. What is occupational structure?

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8. When was India first official census operation undertaken?

9. Were there any positive contribution made by the British in India? Discuss.

10. What objectives did the British intend to achieve “through their policies of infrastructure

development in India”.

11. What is the central objectives of Planning in India?

12. What were the specific goal of planning in India.

13. Explain “growth with equity” one of the objectives of planning in India?

Accountancy

Ch. I – Accounting for Partnership Firms – Fundamentals

Ch. II – Change in Profit Sharing Ratio among the Existing Partner.

Practice both the chapters illustration and practical questions.

Business Studies

Ch. I – Nature and Significance of Management

Ch. II – Principles of Management

Read and practice both the chapters‟ illustration and practical questions.

IT

Case Study: (Any One) Analyse the following scenarios and describe all the steps of the project development cycle:

Online tutoring

Online matrimonial bureau

Online ticket booking

Online Shopping.

Bill Calculator

Online Quiz

Note : Write all the information of the Case Study (Any One) in your IT Practical File with proper

pictures and captions.

Physical Education

Prepare a project on the topic “How to organise a inter school Football match in your School Campus.”

The project should have four pages- 1. Cover page 2.Terms and conditions of the tournament. 3.

Organising committees. 4. When & how the matches will be conducted.

Complete the chapter no. 2 (sports & Nutrition) after vacation class test will be held of chapter no. 1 & 2.

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Hindustani Vocal

Summer vacations provide ample time for the children to enjoy family time together and create memorable

moments.

Some tips to make this holiday special:

Have a family dinner every day.

Play board games with your parents.

Spend some quality time with an elderly person in the family.

Beat the heat by watching inspirational movies with your family.

Read a book in this vacation.

Drink water.

HOLIDAY HOME WORK

LEARN A SKILL: learn any of your favourite skills (singing, dancing, martial arts, gardening,

cooking etc.) during this vacation and submit the relevant picture album with an appreciation letter

from the trainer.

Practice the taal and raag taught in your classes.

Make the video of your practice and submit it to your music teacher after reopening after the

summer holidays.

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