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Class XIIA Holiday Home-Work

Math

1.Do all the questions from C.B.S.E. Question papers(Year

2010,2011,2012,2013,2014,2015)on the topics

i) Relations and Functions

ii)Inverse trigonometric function

iii)Matrices

2.Do all the examples given on N.C.E.R.T book on the topics

i) Relations and Functions

ii)Inverse trigonometric function

iii)Matrices

Physics

1.Define electric potential? Is it a scalar or vector?

2What is an equipotential surface?

(i)what is the shape of equipotential surface for a uniform electric field?

(ii)what is the shape of equipotential surface due to single isolated charge?

3.Define capacitance? Give its unit

4.Define dielectric constant in terms of capacitance of capacitor?

5.Define an expression for the electric potential at a point along the axial line of the dipol

6.Define an expression for potential energy of a system of two point charge?

7Define an expression for the capacitance of a parallel plate capacitance when there is air

between its path?

8.A parallel plate capacitor with air between the plate has a capacitance of 8PF?what will be

the capacitance if the distance between the plates be reduced by half and space between

them is filled with a substance of distance constant K=6

Chemistry

Q.1.Define the following terms:-

(a)Unit cell

(b)Crystalline solid

(c)Primitive unit cell

(d)Crystal lattice

(e)F-centre

Q.2.Differntiate between the following

(a)Tetrahedral and Octahedralvoids.

(b)Crystaline and amorphous solid.

(c)B.C.C unit cell F.C.C unit cell

(d)Square close packing and hexagonal close packing

(e)Schottky defect and frenkle defect.

Q.3.If KCL is doped by 10-3 mol % cdcl2.What is the number of catio vacancy?

Q.4.Acompound form hcp structure.What is the number of tetrahedral voids of 0.5 mol of

this compound is taken.

Q.5.Allcrystallises in acubic closed structure.Its metallic radius is 225pm find the length of

the sideof the unit cell.

Q.6.Ag crystallises in f.c.c lattice of edgelength of the cell is 4.07 x 10-8 cm and density is 10.5

g cm-3 calculate the atomic mass of thr Ag.

Q.7.A cubic solid is made of two elements A and B.Atoms of A are at the corner of the cube

and Bat the body centre.What is the formula of the compound?

English

1. Your school organized a seminar on Swine Flu for creating awareness among

students of your school and their parents. As secretry of the Health Club of Oasis

Public School Hyderabad, write a report in 100-125 words for The Deccan Herald.

2. Your school organized an exhibition cum-sale of the items prepared under work

experience by your school students. There was an overwhelming response from the

public. Prepare a report in 100-125 words for a local daily. You are the Coordinator,

S.U.P.W, activities Nita School, Gurgaon.

3. Imagine that you are the Director, Language Learning Limited, 1, Patel Road,

Chandigarh. Write a reply letter to Ram/Isha, living at 3, MG Road Solan answering

his/her quaries about a diploma course in spoken English, organized by your

institute.

4. Imagine that you recently visited a leading restaurant in your city, but were shocked

to see the quality of the food served. Not only were some of the food items putrid,

but were also rancid. Write a letter of complaint to the Manager of the restaurant,

complaining about the food, and asking for a refund of the payment made.

5. Recently there have been a spate of accidents on the roads of the town and they

have been steadily rising over the years. In 2013 there were 205 accidents but the

number swelled to 816 last year. Taking these hints write a speech to be delivered in

the scholl assembly.

6. Children living in cities are rarely seen playing of outdoors in the neighbourhood.

Being busy with attraction like the television and computer games, they miss the joy

of outdoor play. Write an article in 150-200 words for the magazine, kids Talk

highlighting the need and value of outdoor games. Your are Vidya/Viond.

7. Write short summary of all the lessons of the novel The Invisible men.

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Computer science

Class XIIB Holiday Home-Work

Math

Sr.No. Name Of Chapter

1. Functions and Relations

2. Inverse Trigonometric Functions

3. Matrices and Determinant

ONE QUESTION DAILY FROM EACH OF THREE CHAPTERS TAKEN FROM NCERT TEXT BOOK

BIOLOGY

1. Make a comparative chart of following :

(a) developement of dicot embryo and human embryo.

(b) megasporogenesis and oogenesis

(c) spermatogenesis & oogenesis

(d) conidia &zoospore

(e) mitospore & meiospore

(f) menstrual cycle & oestrous cycle.

2. Do all questions of reproductive health chapter.

3. Do five years questions of AISSCE of the following chapters:

Ecosystem

Biodiversitry &

Environmental pollution .

4. Prepare investigatory project of topic given to you.

Physics

LESSONELECTROSTATICS

Q1. Two point charges q1 and q2 are placed close to each other. What is the nature of the force

between them when: (i) q1q2 < 0 and (ii) q1q2 >0? 1

Q2. Name the quantity with unit J/C. Is it a scalar or vector quantity? 1

Q3. An electric dipole of dipole moment 2x10-6 C m is enclosed by a closed surface. What is the flux passing out of the surface? 1

Q4. What is the angle between the directions of electric field at any (i) axial point and (ii) equatorial point due to an electric dipole? 1

Q5. Two point charges placed at a distance r in air exert a force F on each other. At what distance will these charges experience the same force F in a medium of dielectric constant

K? 1

Q6. Consider a dipole of length 2a. What is the magnitude and direction of electric field at the mid point of the length of the dipole 2

Q7. Two charges +10C and -20C are placed 15 cm apart. At what point on the line joining the two charges is the electric potential zero? 2

Q8. 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. 2

(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 B and C.

Q9. Derive expression for electric field at a point on the equatorial line of dipole. 3

Q10. Using Gauss Theorem, show mathematically that for a point outside a shell, the field due to a uniformly charged thin shell is the same as if the entire charge of the shell is concentrated at

the centre. Why do you expect electric field inside the shell to be zero according to this

theorem? 3

Q11. An electric dipole of dipole moment p is placed in a uniform electric field. Write the expression for the torque experienced by the dipole. Identify two pairs 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 maximum value (iii) Zero. 3

Q12. Derive expression for energy stored in parallel plate capacitor. Net capacitance of three identical capacitors in series is 1F. What will be their net capacitance if connected in parallel? Find the ratio of energy stored in the two configurations if they are both connected to the same source. 5

WORK SHEET II

SUBJECT : PHYSICS

CLASS XII LESSONELECTROSTATICS

Q1. The graph shown here, shows the variation of the total energy I stored in a capacitor against

the value of the capacitanceI itself. Which of the two the charge on the capacitor or the

potential used to charge it is kept constant for this graph? 1

Q2. In which orientation a dipole placed in uniform electric field is in (i) stable (ii) unstable

equilibrium? 1

Q3. The electric potential as a function of distance x is shown in Fig . Construct a graph of the

electric field strength E. 2

2

1

Q4. The two graphs drawn below, show the variation of electrostatic potential (V) with I being

distance of point from the point charge for two point charges Q1 and Q2. 1

(iii) What are the signs of the two charges?

(ii) Which of the two charges has a larger magnitude?

Q5. A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V.

What is the potential at the centre of sphere. 1

Q6. Define electric potential. Derive an expression for the electric potential at a distance r from a

point charge q. 2

Q7. Why two equipotential do not cross each. Draw equipotential surface for electric field which

is decreasing along X-axis. 2

Q8. A uniformly charged conducting sphere of 2.4m diameter has a surface charge density

8.0x10-7C/m2. Find the charge on the sphere. What is the total flux leaving the surface? 2

Q9 A parallel plate capacitor is charged to a potential difference V by a dc source. The

capacitor is then disconnected from the source and a dielectric slab of dielectric constant K

is inserted between the plates. How does the (i) the capacitance, (ii) electric field between

the plates and (iii) the energy stored in the capacitor be affected? Justify your answer in

each case. 3

Q10. A conducting slab of thicknesst is introduced between the plates of a parallel plate

capacitor, separated by a distance d (t

equilibrium in a uniform electric field of intensely 103NC

-1.

2

7. The sum of two point charges in 7Nc they repel each other with a force of 1N when kept 30cm apart in free space. Calculate the value of each charge.

2

8. Two point charges 1 = 10 108 and 2 = 2 10

8 are separated by a distance of 10cm in air

(iv) What is distance from charge 1 would the electric potential be zero? (ii) Also, calculate the electric potential energy of the system.

2

9. State Gausss law in electrostatics. Use this law derive an expression for the electric field due to a long straight wire of linear charge density C-m.

3

10. State the principle of the device that can build-up high voltages of the order of a few million volts. Draw its labeled diagram. A stage reaches in this device when the

potential at the outer sphere cannot be increased further by piling up more charge on

it. Explain why? 3

11. A parallel plate capacitor is changed by a battery. After some-times, the battery is disconnected and a dielectric slab of dielectric constant K is inserted between the

plates. How would

(v) the capacitances (ii) the electric field between plates

(vi) the energy stored in the capacitor, be affected? Justify your answer.

3

12. (i)Define electric flux. Write its SI units. (vii) Using Gausss law, prove that electric field at a point due to a uniformly

charged infinite plane sheet is independent of the distance from it.

(iii)How is the field directed if

(a) the sheet is positively charged (b) Negatively charged?

5

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Chemistry

CLASS:XII B: CHEMISTRY

1. An element has a body-centred cubic (bcc) structure with a cell edge of 288 pm. The density

of the element is 7.2 g/cm3. How many atoms are present in 208 g of the element?

2. If the radius of the octahedral void is r and the radius of the atoms in the close packing is R,

derive the relationship between r and R.

3. What is the coordination number of each type of ions in a rock-salt type crystal structure?

4. What is the number of atoms in a unit cell of a simple cubic crystal?

5. How would you account for the following?

(i) Frenkel defects are not found in alkali metal halides.

(ii) Schottky defects lower the density of related solids.

(iii) Impurity doped silicon is a semiconductor.

(iv)Schottky defects lower the density of related

solids. (v)Conductivity of silicon increases on

doping it with phosphorus.

6. A solution containing 30 g of a non-volatile solute exactly in 90 g of water has a vapour

pressure of 2.8 kPa at 298 K. Further 18 g of water is then added to the solution, the new

vapour pressure becomes 2.9 kPa at 298 K. Calculate (i) molar mass of the solute (ii) vapour

pressure of water at 298 K.

7. Define the term osmotic pressure. Describe how the molecular mass of a substance can be

determined by a method based on measurement of osmotic pressure.

8. Non-ideal solutions exhibit either positive or negative deviations from Raoults law. What

are these deviations and why are they caused? Explain with one example for each type.

9. 45 g of ethylene glycol (C2H6O2) is mixed with 600 g of water. Calculate (a) the freezing point

depression and (b) the freezing point of the solution.

10. Read the chapter, Chemistry in Everyday Life and try to prepare question answers (about

30 in number, in total) of very short (one mark each) and short answer (2 marks each) types.

Class X A and X B: Chemistry

1. How will you test the evolution of H2 gas in a reaction?

2. What is the name and formula of the product formed when water is added to quick lime for

white wash?

3. Explain the differences between displacement and double displacement reactions.

4. Why is a decomposition reaction generally endothermic?

5. What is rancidity? How can it be prevented?

6. Explain corrosion. What are the different methods used to prevent rusting? Explain each of

them briefly.

7. Give an example of a reaction which is a displacement reaction as well as a redox reaction.

8. Barium chloride on reacting with ammonium sulphate forms barium sulphate and

ammonium chloride. Write the balanced chemical equation for the reaction and write its

type.

9. On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide

(black), oxygen gas and a brown gas X is formed

(a) Write a balanced chemical equation of the reaction.

(b) Identify the brown gas X evolved.

(c) Identify the type of reaction.

(d) What is the nature of the aqueous solution of

the gas X acidic or basic?

10. Explain the activity series of metals.

11. Prepare a computer based project (ppt presentation or video file or any other) on the

chapter, chemical reactions and equations. [Those who have already submitted, need not

submit again.]

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Computer science

Class XII C Holiday Home-Work

Accountancy

1. What is the difference between fixed and fluctuating capital of partners? Under what

situations fixed capital of a partner can change?

2. Why is profit and loss appropriation account prepared?

3. What do we record in revaluation account?

4. Solve the unsolved practical questions (that came in CBSE exams) given after the end of

chapter one and two. Also, learn and write down the theory questions that came in CBSE

exams of previous years.

5. Do at least two questions for each of the five cases of calculation of new profit sharing ratio

from chapter-3 (admission of a partner) and also calculate the sacrifice ratio for the same.

6. Complete the portion of project work as discussed in the class.

7. Revise all the topics done in the class so far. There will be a test on the same.

Subject- Business Studies

1. Is management a profession? Give reasons in support of your answers.

2. Explain the various types of plans.

3. Revise the chapters covered in the class (first four chapters). There will be a test on

the same.

4. Complete the portion of project on the topic Principles of management as

discussed in the class.

SUBJECT:ECONOMICS

1.Differenciate between micro economics and macro economics. Explain any four points?

2. Define Economy?what are the three types of an economy? Explain fully?

3.Defferenciate between positive economics and normative economics?

4.Define central problems of an economy?Explain different types of an economy?

5.Explain PPC(Production Possibility Curve) with scheduled and diagram?

6Write three features of PPC?

7.Write short note of the followings

(a)Opportunity cost (b)Marginal rate if transformation(c) Growth of resources?

8.What is the meaning of economosing of resources?

9.Why does an economic problems arise?

10.State three features of economic resources?

11.Why does PPC concave to the origin?

12.Explain the problems what to produce?

13.Define utility?What is the relationship between TU and MU?

14.Define consumers quialibrium in case of one commodity?

15.Define indifference curve? Write four characteristics of an indifference curve?

16.Define cardinal and ordinal concepts of economics?

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