SUMMER VOCATION HOMEWORK GEOGRAPHY

CLASS - XII

1) DO THE SELF STUDY FOR THE FOLLOWING TOPICS :-

A) HUMAN DEVELOPMENT

B) INTERNATIONAL TRADE

C) HUMAMN SETTELMENT

2) Mention a practical record for data - its source and compilation and data processing ,ch-2 and ch-3.

3) has anyone migrated form your family , if so state the resons and its consequences on the financial background of your family.

4) from your point of view what can our govt do to stop suicide of indian farmers.

5) how is water crisis affecting the lifes of indian . ellaborate by giving exampels from different states.

COMPUTER SCIENCE

Summer Vacation Home Assignment, 2017-18English Core

Class XII

Q1. (a) Read at least five short reports in any English newspaper. Cut and paste them on your note-book. On the basis of your reading of these reports, make notes on them in points only, using headings and sub-headings. Use recognizable abbreviations wherever necessary.

(b) Make a summary of these passages in not more than 80 words and also suggest a suitable title.

Q2. You are looking for a suitable match for your sister. Draft a suitable advertisement to be published in the Matrimonial column of a national daily giving necessary details.

Q3. You want to sell car as you are going abroad. Draft a suitable advertisement to be published in a national daily.

Q4. Water is precious and each one of us must stop wastage. Design a poster in not more than 50 words urging people to employ various methods of rain water harvesting in their colonies.

Q5. You lost your bus pass in the school. Write a notice in not more than 50 words giving details of the pass and the probable time of the day you lost it.

Q6. Your school organized a ten day camp in a village during the summer holidays. As the leader of team, write a letter to the editor of a newspaper giving an account of your activities there.

Q7. Mitaali of 98-C, A.P. Road, New Delhi desires to be a fashion designer. She writes to the Director of the National Institute of Fashion Technology, Chandigarh, seeking information about their courses, admission procedure, eligibility criteria, fee structure, placement opportunities etc. Write her letter.

Q8. Your school organized a three day camp in a village during the Summer Vacation. As the leader of team, write a letter to the editor of a newspaper giving an account of your activities there. Q9. Describe the dramatic entry of the stranger at the Coach and Horses and his strange behaviour.

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Physics

A. Preparation of Innovative exhibit with write ups for Science Exhibition.

B. Self study of following chapters and follow up exam of 35 marks in month of June. Unit -5 ( EMW), Unit – 6 (ray optics & optical instruments), unit – 8 (Atoms & Nuclei)

C. Solve following assignment in HW copy

Q1. . An electric dipole is held in a uniform electric field (i) using suitable diagram show that it does not undergo any translatory motion and (ii) drive an expression for the torque acting on it and specify its direction.Q2. State Gauss’s theorem & apply this theorem to obtain an expression for the electric field intensity at a point due to (i)an infinitely long uniformly charged straight wire (ii) a uniformly charged infinite sheet (iii) a uniformly charged thin spherical shell at an (a) outside point (b) inside point.Q3. (a)Deduce an expression for the capacitance of a parallel plate capacitor with air as the medium between the plates (b)A dielectric slab of thickness‘t’ is kept in between the plates each of area A of parallel plate capacitor separated by a distance of‘d’. Drive an expression for the capacitance of capacitor for t <<d.Q4. (i) Explain briefly how a capacitor stores energy on charging. Obtain expression for energy stored (ii) A parallel plate capacitor of plate separation’s’ is charged to a p.d. ‘V’. A dielectric slab of thickness d and dielectric constant K is introduced between the plates while the battery remains connected to the plates.(a) Find the ratio of energy stored in the capacitor after and before the dielectric inintroduced, give physical explanation for this change in stored energy.(b) What happens to the charge on the capacitor?(c)How does the electric field between plates change.

Q5. In a Van de Graaff type generator a spherical metal shell is to be a 15 × 106 V electrode. The dielectric strength of the gas surrounding the electrode is 5 × 107 Vm–1. What is the minimum radius of the spherical shell required? (You will learn from this exercise why one cannot build an electrostatic generator using a very small shell which requires a small charge to acquire a high potential.) [Ans 30cm]Q6. 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. Q7. (a) Describe the formula for the equivalent EMF and internal resistance for the parallel combination of two cells with EMF E1 and E2and internal resistances r1 and r2 respectively. (a)What is the corresponding formula for the series combination?

(b) Two cells of EMF 1V, 2V and internal resistances r2 and r1 respectively are connected in (i) series, (ii) parallel. What should be the external resistance in the circuit so that the current through the resistance be the same in the two cases? In which case more heat is nerated in the cells?Q8. Deduce the condition for balance in a Wheatstone bridge. Using the principle ofWheatstone bridge, describe the method to determine the specific resistance of a wire in the laboratory. Draw the circuit diagram and write the formula used. Write any twoprecautions.Q9. Describe the principle and construction of potentiometer. Explain how a potentiometer can be used to compare the emfs of two primary cells?Q 10. Draw Circuit diagram for a meter bridge to determine the unknown resistance of a

resistor. Obtain the balance condition for a meter bridge. Find the shift in the balancepoint for a meter bridge when two resistors in its two gaps, are interchanged.Q 11. Are the paths of e’s straight lines between successive collisions in the (i) absence of electric field (ii) presence of electric field. Establish a relation between drift velocity and current. Hence obtain the relation between current density and drift velocity.Q12. With the help of a neat and labeled diagram, explain the underlying principle and working of a moving coil galvanometer. What is the function of (i) uniform radial field (ii) Soft iron core?.Q13. Using Kirchoff’s laws, calculate the potential difference across the 8 ohm resistor.[Ans : Current through resistance 8= 0.46A, P. d. = 3.68Volts]

Q14. E2 =1.02V, PQ=1m.When switch S open, null position is obtained at a distance of 51 cm from P. Calculate (i) potential gradient (ii) emf of the cell E1 (iii) when switch S is closed, will null point move towards P or Q. Give reason for your answer.

[Ans: (i) Potential gradient k = 0.02V/cm (ii) emf of the cell E1 = 2V (iii) When switch S is closed, null point is not affected because no current drawn from cell E1 at the null point. ]

Q15. In the potentiometer circuit shown, the balance point is at X. State with reason, where the balance point will be shifted when (i) R is increased; (ii) S is increased, keeping R constant.

(ii) Cell P is replaced by another cell whose emf is lower than that of cell Q.

Q16. Two identical plane metallic surfaces A and B are kept parallel to each other in air separated by a distance of 1 cm as shown in figure.A is given a positive potential of 10V and the outer surface of B is earthed. (i) What is the magnitude and direction of the uniform electric field between Y and Z? (ii) What is the work done in moving a charge of 20 C from X to Y?Ans : (i) E = 1000 V/m, direction from A to B(ii) Zero.

Q17. The following data was obtained for the dependence of the magnitude of electric field, withdistance, from a reference point O, within the charge distribution in the shaded region.Field Point A B C A’ B’ C’Magnitudeof electricfield

E E/8 E/27 E/2 E/16 E/54

(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’? Q18. Use Gauss’s law to obtain an expression for the electric field due to an infinitely long straight uniformly charged wire. 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 dimensionsTalking A=10NC-1m-1 and B = 5NC-1 calculate. (i) the electric flux through the cube. (ii) net charge enclosed within the cube.[Ans (i ) 0.05Nm2/C (ii) 44.25X10-14C ] Q19. Two point charges of charge values Q and q are placed at distance x and x/2 respectively from a third charge of charge value 4q, all charges being in the same straight line. Calculate the magnitude and nature of charge Q such that the net force experienced by the charge q iszero. [Ans Q = q/4 , +ive ]Q20Total capacitance of the combination between A and B in the given figure is 15μF. Calculate the capacitance of capacitor C.[ Ans. 60 μF]Q21. 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) C1= 20Co (ii) E 1=2Eo (iii) u1 = 40uo]

Class-XII Commerce (Second Shift)Summer Vacation Home Work

2017-18Instructions:

Home work is to be done in Home Work Note Book. Home work is not be copied from any source, It is to be done as

per class instructions. Mark difficult area of learning while dealing with the Home

Work. All home work should be evenly distributed during holidays. Holiday Home Work is to be evaluated by the day one of

opening of the Vidyalaya.

Accountancy:Project- Work: Prepare comprehensive project work as per CBSE guidelines and instructions during classes.

CBSE Previous Five Years Question Papers are to be followed and solved for the following topics

Fundamentals of Partnership,Valuation of Goodwill,Admission of a partner

Book on NCERT- Accountancy -IFundamentals of Partnership,Valuation of Goodwill,Short Answer type questions-1,2,3,4,5,7Practical Questions: 2,3,6,8,14,19,22,28,37Admission of a partner

Short Answer type questions:3,6Numerical Questions:1,2,8,9,17,18,34,35

Business StudiesProject- Work: Prepare project work as per CBSE guidelines and instructions during classes.Topic : Principles of Management- Henri Fayol

CBSE Previous Five Years Question Papers are to be followed and solved for the following topicsNature and Significance of Management Principles of Management

Book on NCERT- Business Studies Part-I

Nature and Significance of Management Case Problems- 1

Short Answer type questions-1,2,3,4,5Long Questions: 1,2,3,4,5

Principles of ManagementCase Problems- 1

Short Answer type questions-1,2,3,4,5Long Questions: 1,2,3,4,5

CLASS XII

CHEMISTRY

1. Solve intext questions, exercise problems and previous years’ board questions (2009-2017) from unit I,II and X on everyday basis.

2. Write short notes on:a) Denaturation of proteinsb) Invert sugar/inversion of sugarc) Tranquilizersd) Antibioticse) Analgesicsf) Antifertility Drugsg) Artificial sweetning agentsh) Synthetic detergentsi) Antiseptics and disinfectants3. Prepare the tabulated chart for the chapter Polymers.

BIOLOGY

Q.1. Explain with the help of a diagram the development of a mature embryo sac from a megaspore mother cell in angiosperm.

Q.2. Why does pollen grain posses two male gametes? Explain.

Q.3. How does the pollen mother cell develop into a mature pollen grain? Illustrate the stages with labeled diagram.

Q.4. Placenta acts as endocrine gland. Explain.

Q.5. Explain the property that prevent normal cells from becoming cancerous.

Q.6. Explain the cause of global warming. why is it a warning to mankind.

Q.7. Both wind and water pollinated flowers are not very colorful and do not produce nectar. Why it is so?

Q.8. Explain the changes in the primary oocyte undergoes while in different follicular stages before ovulation.

Q.9. Explain the event of oogenesis.

Q.10. Name the malarial parasite where do the gametocytes of this parasite develop? Give a flow chart of its life cycle.

MATHS HOLIDAY HOMEWORK

CLASS – XII

Q-1) Revision of the following chapters –

a) Relation & function b) Inverse Trigonometry Functionsc) Matricesd) Determinant

Q-2) Practice last five year CBSE papers

Q-3) Self-study topics are –

a) Vectors b) 3D

Q-4) Learn all differentiation and Trigonometry Formulas

HINDI

HOLIDAY HOMEWORK

ECONOMICS

PROJECT WORK

SELECT ONE TOPIC FOR ECONOMICS PROJECT AND COLLECT DATA AND PICTURES FOR THE PROJECT .

- SURVEY RELATED TO TOPIC DONE BY STUDENTS IN VACATION Q-1 MAKE TEN MCQ QUESTIONS FROM EACH CHAPTER ( MICROECONOMICS )Q-2 TWENTY NUMERICAL QUESTIONS FROM ELASTICITY OF DEMAND .Q-3 TWENTY NUMERICAL QUESTIONS FROM COST .Q-4 LEARN ALL THE QUESTIONS FROM HOMEWORK COPY.HOLIDAY HOMEWORK DONE IN SEPARATE COPY.

HISTORY – 12TH D

1. What are the main features of Maurya Empire?2. Describe the main features of early civilizations of India.3. Name two sacrifices performed by the kings during the

Vedic time.4. Explain any two problems that were faced by Historians in

writing history of Ancient time.

5. State the factors that helped Magadha emerge as the most powerful Mahajanapada.

6. Describe the Varna system according to the Brahamanical texts.

7. Write the main teaching of Buddha 8. “The Begums of Bhopal played a significant role in

preserving the remains of Sanchi stupa” Expalin in 300 words

9. What kinds of duties were performed by Chandala according to Manu scripts?

10. Describe the marriages (various types) of Vedic period and Mahabharata period.

11. Describe the organization and the role of Buddhist Sanghas.

12. Describe the main features of Puranic Hinduism.