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KENDRIYA VIDYALAYA No. 2, Delhi Cantt.–10 SUMMER BREAK HOLIDAYS HOMEWORK: 2016-17

SHIFT I CLASS – XII

HINDI ग्रीष्म कालीन अवकाश गहृकार्य

कक्षा 12 (हहिंदी केन्द्रिक/हहिंदी ऐन्द्छिक )

1. ननम्ननलन्द्ित ववषर्ों पर 400 शब्दों में ननबिंध नलिो | क आतिंकवाद एक चुनौती

ि लोकतिंत्र में र्वुाओिं की भनूमका

ग नारी सशक्तीकरण

घ स्वछि भारत अनभर्ान

2. अपने के्षत्र की समस्र्ाओिं को व्र्क्त करते हुए सिंपादक को पत्र नलिो | 3. चोरी की घटनाओिं के नलए पनुलस अधीक्षक को नशकार्ती पत्र नलिो | 4. स्वछि जल की आपनूतय के नलए हदल्ली जल बोर्य के आपनूतय अनधकारी को पत्र नलिो | 5. प्रथम मानसक परीक्षा के प्रशन पत्र के सभी प्रश्नों के उत्तर नलिो | 6. पढारे् गए पाठो की पनुराववृत्त करो |

ENGLISH

Q 1 Read all the chapters of the novel, ’’THE INVISIBLE MAN’ AND WRITE CHAPTER WISE summary.

Q 2 Read lessons 2-6 of FLAMINGO & VISTAS and write the focal points of all these lessons.

Q 3 Solve two sets of monthly test on paper for the month APRIL & MAY.

COMPUTER SCIENCE

A test of 50 marks will be conducted after Summer Holidays from the following Topics (Self Study)

Unit 1: Review of C++ Covered in Class XI (For Examination Question No. 1 – 12 Marks )

Unit 6: Boolean Algebra (For Examination Question No. 6--- 08 Marks)

Unit 7: Communication and Network Concepts (For Examination Question No. 7--- 10 Marks)

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PHYSICS Holiday Home Work-2016-17

CLASS XII (PHYSICS)

1. The graph shows the variation of voltage V across the plates of two capacitors A and B versus increase

of charge q stored on them. Which of the two capacitors has higher capacitance? Give reason.

2. What is an electric dipole moment and write its SI unit and direction. 3. A potential difference of V volts is applied across the ends of a copper wire of diameter D and length l.

What will be the effect on drift velocity of free electrons when (i) V is doubled (ii) l is doubled?

4. The following data was obtained for the dependence of the magnitude of electric field, with distance,

from a reference point O, within the charge distribution in the shaded region.

Field Point A B C A’ B’ C’

Magnitude of E E/8 E/27 E/2 E/16 E/54

electric field

(i) Identify the charge distribution and justify your answer.

(ii) If the potential due to this charge distribution, has a value V at the point A, what is

its value at the point A’?

5. Two point charges of +16 μC and – 9 μC are placed 8 cm apart in air. At what point on the line joining

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the charges is the electric field intensity zero? 6. Find the total energy stored in the capacitors in the given network.

7. S1 and S2 are two parallel concentric spheres enclosing charges Q and 2Q respectively

as shown in Fig.

(i) What is the ratio of electric flux through S1 and S2?

(ii) How will electric flux through sphere S1 change, if a medium of dielectric constant 5 is introduced in

the space inside S1 in place of air?

8. (a) Draw electric field lines between the plates of a parallel plate capacitor with (i) air and (ii) dielectric

as the medium. (b)A parallel plate capacitor with air as dielectric is connected to a power supply and charged to a

potential difference Vo. After disconnecting from power supply, a sheet of insulating material is inserted between the plates completely filling the space between them. How will its

(i) Capacity (ii) electric field and (iii) energy change.

9. Use Gauss’s law to obtain an expression for the electric field due to an infinitely long straight uniformly

charged wire.

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Electric field in the above figure is directed along + X direction and given by

Ex = 5Ax + 2B, where E is in NC-1

and x is in metre, A and B are constants with dimensions Talking

A=10NC-1

m-1

and B = 5NC-1

calculate.

(i) the electric flux through the cube.

(ii) net charge enclosed within the cube.

10. The given graph shows the variation of charge Q versus potential difference V for capacitors C1 and C2.

The two capacitors have same plate separation, but the plate area of C2 is double than that of C1.Which

of the lines in the graph correspond to C1 and C2 and why? 11. A current of 4A is flowing in a copper wire. If the same current is allowed to flow through another

copper wire of double the radius, what is the effect on the drift velocity of free electrons?

12. A point charge q is placed at O as shown in Fig.5. Is VA – VB positive, negative or zero if q is a (i)

positive charge (ii) negative charge?

13. Two point charges 4Q and Q are separated by 1m in air. At what point on the line joining the charges is the electric field intensity zero?

14. Find the charge on 5 μF capacitor in the circuit shown in Fig.

15. S1 and S2 are two parallel concentric spheres enclosing charges 2Q and 4Q respectively

as shown in Fig.

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(i) What is the ratio of electric flux through S1 and S2?

(ii) How will electric flux through sphere S1 change, if a medium of dielectric constant 5 is introduced in

the space inside S1 in place of air? 16. An electric dipole with moment p is placed in a uniform electric field E . Write the expression for the

torque experienced by the dipole. Identify two parts of perpendicular vectors in the expression. Show

diagrammatically the orientation of the dipole in the field for which the torque is (i) maximum (ii) half

the max. value (iii) zero.

17. (a) State the theorem which relates the enclosed charge, inside a closed surface, with the electric flux

through it. Use this theorem to obtain the electric field due to a uniformly charged thin spherical shell at an (i) outside point (ii) inside point. (b) The electric field components due to a charge inside the cube of side 0.1m are as shown:

Ex x, where 500 N / C m E y 0, Ez 0

Calculate (i) the flux through the cube and (ii) the charge inside the cube.

18. Obtain the equivalent capacitance for the network shown in Fig. for 300 V d.c. supply, determine

the charge and voltage across each capacitor.

19. In the circuit shown in Fig. find (i) the equivalent capacitance between A and D and (ii) the charge on 12 μF capacitor [Ans 5μF, 1.2μF]

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20. Calculate the capacitance between points A and B in Fig. [Ans 3μF] 21. In the circuit shown in Fig. find the equivalent capacitance between points A and B. [Ans 4μF]

22. In the circuit shown in Fig., find the equivalent capacitance between points A and B.[ 5μF] 23. In the circuit shown in Fig., find the equivalent capacitance between points A and B. [1μF] 24. A parallel plate capacitor with air as dielectric is connected to a power supply and charged to a potential

difference Vo. After disconnecting from power supply, a sheet of insulating material is inserted between the plates completely filling the space between them. How will its (i) charge on the plates (ii) electric field between the plates (iii) potential difference between the plates (iv) capacitance (v) energy stored in

the capacitor.[Ans (i) Q is constant (ii) E E

O (iii) V V

O (iv) C KC (V) U U

O ] O

O K K K

25. On charging a parallel plate capacitor to a potential V, the spacing between the plates is halved, and a

dielectric medium of r = 10 is introduced between the plates, without disconnecting the d.c source.

Explain using suitable expressions, how the (i) capacitance (ii) electric field (iii) energy density of the capacitor change.

[Ans (i) C' 20 CO (ii) E

' 2EO (iii ) u 40 uo ]

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CHEMISTRY FOR CLASS 12 A, B, C (1 SHIFT)

1. FULL NCERT TEXTBOOK EXERCISE QUESTIONS FROM LESSION 1-5.

2. SOLVE ALL INTEXT QUESTIONS FROM LESSION 1-5.

3. AT LEAST 10 NUMERECAL PROBLEMS OTHER THAN TEXTBOOK FROM EACH LESSION 1-5.

4. PREPARE AN INVESTIGATORY PROJECT FOR AISSCE-2017 BOARD EXMINATION.

5. SOLVE CBSE QUESTION PAPER OF PREVIOUS YEAR 2015-16.

6. WRITE NOTES ON DIFFERENT TOPICS OF THE LAST LESSON “CHEMISTRY IN EVERYDAY LIFE”.

BIOLOGY 1. MENTION THE UNIQUE FEATURES OF AN IDEAL CONTRACEPTIVE

2. HOW DOES LNG 20 WORK TO PREVENT PREGNANCY?

3. WHAT DO ORAL CONTRACEPTIVES CONTAIN?

4. GIVE 2 EXAMPLES OF STD S THAT ARE NOT CURABLE

5. NAME THE MUSCULAR AND GLANDULAR LAYERS OF THE HUMAN UTERUS

6. DIFFERENTIATE BETWEEN TROPHOBLAST AND INNER CELL MASS

7. DRAW THE MALE GAMETOPHYTE OF ANGIOSPERM LABEL ANY 4 PARTS AND WRITE THEIR FUNCTIONS

8. WHY DO ATHELETES CONSUME POLLEN TABLETS?

9. STATE THE ADVANTAGES OF SEEDS TO ANGIOSPERMS

10. WHICH PLANT CAUSES POLLEN ALLERGY?

11. DEFINE AND DESIGN A TEST CROSS

12. NAME THE TYPE OF INHERITANCE IN WHICH THE PHENTYPIC RATIO IS THE SAME AS GENOTYPIC RATIO

13. WHAT IS THE PLOIDY OF GAMETE AND MEICYTE?

14. WHY DID MENDEL S WORK REMAIN UNDISCOVERED FOR 35 YEARS?

15. EXPLAIN SEX DETERMINATION IN BIRDS

16. WHY DID MORGAN CHOOSE DROSOPHILA FOR HIS EXPERIMENTS?

17. A MAN WITH BLOOD GROUP AB MARRIES A WOMAN WITH BLOOD GROUP O.WHAT WILL BE THE

EXPECTED BLOOD GROUP OF THEIR CHILDREN?

18. EXPLAIN THE LAW OF INDEPENDENT ASSORTMENT WITH THE HELP OF A CROSS

19. DRAW A LABELLED DIAGRAM OF A FERTILISED EMBRYO SAC

20. WHAT IS PEDIGREE ANALYSIS?N EXAMPLE OF AN AUTOSOMAL DOMINANT TRAIT AND AUTOSOMAL

RECESSIVE TRAIT

Maths

A)

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Question 01:- If defined by show that is 1-1& onto.

Also find .

Question 02:- Let be a function defined as .

Show that where s is the range of f is invertable. Also find f-

1(22).

Question 03:- Let A=QxQ and be the binary operation on a defined by

(a.b)X(c.d)=(a+c.b+d) Show that is commutative Associative. Find the identified

element and inverse of if any.

Question 04:- Show that the relation R on the set real number R is given by R =

{(a.b):|a-b| is div by 5. a.b R} is an equivalence relation .

Question 05:- Simplify

.

Question 06:- Solve for x.

.

Question 07:- Show that

= abc+bc+ca+ab.

Question 08:- If a.b.c are +ve and unequal show that value of determinant

is negative.

Question 09:- If

show that Hence find A-1

.

Question 10:- Find A-1 if

B) Miscellaneous Examples and exercise on .

a) Inverse Trignometric functions.

b) Matrices

c) Deteminants.

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Business Studies (054)

1.) Prepare a project (file) on, any two of the given topics:

Principles of Management.

Marketing.

Business Environment.

Consumer Protection.

2.) Do 10 case studies each (in a separate notebook) from the

Following chapters:

Financial Management.

Financial Market.

Marketing.

Consumer Protection.

Accountancy ( 055)

1.) Prepare a project (file) on

FINANCIAL STATEMENT ANALYSIS.

2.) Do 10 questions each from chapters of Analysis Of Financial

Statements.

3.) {Accounting Ratios} Do 2 questions each ratio.

NOTE:- Assignment (2) and (3) to be done in separate

Notebook.

Geography

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1. Write and learn data related to hdi 2015 world and

india, population, literacy Rate, area.

2. Revise and write chapter 1 of practical.

3. Learn and write all answers chapter 1to 5 from both

world and india book.

4. Mark on map major river, mountain, desert, capital of

countries and Indian states.

5. Revision of chapter 1 to 5 both book for class test for

july.

(ECONOMICS)

1. Preparation of question answers and notes from

chapter 1 to 4.

POLITICAL SCIENCE

1.Write questions and answers of lesson 4 of

contemporary world politics, lesson 3 and 4 of india

after independence.

2. Make an assignments of these chapter (short

questions minimum 2 marks each)

3. Solve last three years board exam question paper.

History

1. Complete glossary, map, exercise , passage of chapter

4 to 6.

2. Revise chapter 4 and 5 for monthly test july.