# KENDRIYA VIDYALAYA PORT TRUST

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```					               KENDRIYA VIDYALAYA PORT TRUST, KOCHI-03

HOLIDAY ACTIVITIES 2012-13

CLASS XII

SUBJECT: ENGLISH
I.You are raj/ usha . As the president of a voluntary organization you have visited a slum area in your
city destroyed by a massive fire. Write a report on the tragic situation of these homeless people to
be published in a magazine.

II. Write to the editor of a newspaper appealing to the general public for contribution to the Chief
Minister’s drought relief fund.

III. Prepare a character study and study on the plot of the lesson ”The Third level”

CLASS XII HINDI

1. Write the summary of the following lessons from Vithan II ( वितान           II)

1. Jooch (जूच)

2. Atheeth mein dabe pavv (अधीत             में दबे पाि )

3. Dairy ke panne (डेयरी की पानी )

2. Make a PPT on any one.

1. चारली चापललन (Charlie Chaplin)

2. बी . आर . आंबेडकर ( B R Ambedkar)

PHYSICS
I. Define

(a) Intensity of electric current

(b) Drift velocity

(c) Relaxation time

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(d) Resistance

(e) Resistivity

(f)Conductivity

(g) Mobility of electrons

I.    State Ohm’s law .Derive an expression for current in a conductor due to drifting of electrons
and      hence verify Ohm’s law .Show that for a given conductor resistance depends on
length area of cross section and temperature but resistivity depends only on temperature.
II.   State and explain Kirchoff’s laws. What is the Principle of Wheatstones’s bridge? Obtain the
condition Wheatstones bridge to balanced.
III.   With the help of a circuit diagram explain how potentiometer is used to calculate the
internal resistance of a primary cell.
IV.    Exercise 3 Questions 3.8 to 3.13 from NCERT text book.
V.    Prepare and collect data for investigatory project.

CHEMISTRY
1. What type of defect can arise when a solid is heated? Which physical
Property is affected by it and in what way?

2. What type of stoichiometric defect is shown by:
(i) ZnS (ii) AgBr

3. Explain how vacancies are introduced in an ionic solid when a cation
Of higher valence is added as an impurity in it.

4. Ionic solids, which have anionic vacancies due to metal excess defect,
develop colour. Explain with the help of a suitable example.

5. A group 14 element is to be converted into n-type semiconductor by doping
it with a suitable impurity. To which group should this impurity belong?

6. What type of substances would make better permanent magnets?

7. Gold (atomic radius = 0.144 nm) crystallises in a face-centred unit cell.
What is the length of a side of the cell?

8. Aluminium crystallises in a cubic close-packed structure. Its metallic
Radius is 125 pm.
(i) What is the length of the side of the unit cell?
(ii) How many unit cells are there in 1.00 cm3 of aluminum?

9. Calculate the mole fraction of ethylene glycol (C2H6O2) in a solution
Containing 20% of C2H6O2 by mass.

10. Calculate the molarity of a solution containing 50 g of NaOH in 450 mL
solution.

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11. Calculate molality of 2.5 g of methanoic acid (HCOOH) in 75 g of benzene.

12. H2S, a toxic gas with rotten egg like smell, is used for the qualitative analysis. If
the solubility of H2S in water at STP is 0.195 m, calculate Henry’s law constant.

13. The vapour pressure of pure liquids A and B are 450 and 700 mm Hg
respectively, at 350 K . Find out the composition of the liquid mixture if total
vapour pressure is 600 mm Hg. Also find the composition of the vapour phase.

14. A 5% solution (by mass) of cane sugar in water has freezing point of 271K.
Calculate the freezing point of 5% glucose in water if freezing point of pure
water is 273.15 K.

15. Calculate the emf of the cell in which the following reaction takes place:
Ni(s) + 2Ag+ (0.002 M) Ni2+ (0.160 M) + 2Ag(s) Given that emf = 1.05 V.

16. The molar conductivity of 0.025 mol L–1 methanoic acid is 46.1 S cm2 mol–1.
Calculate its degree of dissociation and dissociation constant. Given
(H+) = 349.6 S cm2 mol–1 and (HCOO–) = 54.6 S cm2 mol–1.

17. Write the chemistry of recharging the lead storage battery, highlighting
all the materials that are involved during recharging.

18. Write the Nernst equation and emf of the following cells at 298 K:
(i) Mg(s)|Mg2+(0.001M)||Cu2+(0.0001 M)|Cu(s)
(ii) Fe(s)|Fe2+(0.001M)||H+(1M)|H2(g)(1bar)| Pt(s)
(iii) Sn(s)|Sn2+(0.050 M)||H+(0.020 M)|H2(g) (1 bar)|Pt(s)
(iv) Pt(s)|Br2(l)|Br–(0.010 M)||H+(0.030 M)| H2(g) (1 bar)|Pt(s).

19. Calculate the overall order of a reaction which
has the rate expression
(a) Rate = k [A]1/2 [B]3/2
(b) Rate = k [A]3/2 [B]–1.

20. The conversion of molecules X to Y follows second order kinetics. If
concentration of X is increased to three times how will it affect the rate of
formation of Y ?

MATHEMATICS

1. Find the number of relations on AXA, where n(A)=n
2. A binary operation * over the set of rational numbers Q is given by a*b= ab/4. Evaluate -2*7
3. Let * be a binary operation of NXN defined by (a,b) *(c,d) =ac(b+d)=bd(a+c). Show that the
operation * is commutative as well as associative .Find the identity element for the
operation *.
4. If f(x) =x2+3 and g(x)=1/(x-1) .Find fog
5. Let R be the relation on NXN defined by (a,b) R(c,d)  ad=bc .Prove that R is equivalence
relation.
6. Solve sin(2cos-1{cot(2tan-1x)})=0
7. Write in simplest form tan-1(cosx/(1-sinx) )
8. Solve sin-1(1-x)-2 sin-1x=∏/2

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9. Find the value of tan-1(1)+cos-1(-1/2)+sin-1(-1/2)
10. Find the value of (1) sin-1(sin 2∏/3)
(2) cos-1(cos7∏/6))

11. A square matrix A of order 3 has A  5 , find           A.adjA
12. Using properties of determinants , show that
(b  c) 2      ab          ca
ab       (a  c) 2      bc         2abc (a  b  c )3
ac          bc       ( a  b) 2

BIOLOGY
I. Read Unit VI two times and write the answers of the following questions.
1) The most biologically resistant material is seen in plants. Where do you see it
in plants? What is it called?
2) What is the technique employed to preserve pollen grain for germ plasm
collection?
3) All the aquatic plants cannot use water for pollination- Do you agree with this
statement. Why?
4) Incompatibility is a natural barrier in the fusion of gametes- justify the
statement.
5) What facilitate the entry of the male gamets into the ovule?
6) Why is colostrm essential for an infant?
7) An ovum allows entry of only one sperm at a time. Why?
8) Blood of mother never mixes up with that of foetus. Yet it nourishes the
foetus how?
9) LNG -20 is a type of IUD. In what additional way does it function as a
contraceptive?
10) A couple who was unable to bear a child on clinical examination revealed that
the wife was unable to produce a normal egg. How would you advice the
infertile couple to have children?
II. Complete the write up of Investigatory project and practical record.

Computer Science
1. Differentiate between the post increment and pre increment operators. Also give
suitable C++ code to illustrate both.
2. Which c++ header files are essentially required to be included to run/execute the
following C++ code?
Void main()

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{ int last=25;
for(int c=9;c<=last;c++)
cout<<c<<”:”<<sqrt(c) <<endl;}
3. Rewrite the following program after removing the syntactical errors. Underline each
correction.
#include{iostream.h}
CLASS user
{
long user id; char gender;
public:
void authorize{ cin>>userid>>gender;}

4.Define a class CARRENTAL in C++ with the following description:

Private members:

Car_id of type long int

About_car of type string

Car_type of type string

Rent of type float

A member function assignrent( ) to assign the following values for rent as per the given car
type

Car type                   rent

SMALL                      1000

VAN                        800

SUV                        2500

Public members:

A function getcar( ) to allow user to enter values of Car_id, About_car, Car_type and call
function assignrent( ) to assign rent.

A function showcar( ) to allow user to view content of all data members.

ECONOMICS
1. Explain consumer’s equilibrium in case of single commodity with the help of utility schedule.

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2. How does a consumer reach equilibrium position when he is buying only one commodity?
Explain marginal utility schedule.
3. Given the market price of a good, how does a consumer decide as to how many units of that
good to buy? Explain.
4. How many units of a commodity should a consumer buy to get maximum utility. Explain with
a numerical example.
5. Explain the equilibrium of a consumer in case of two commodities with the help of utility
analysis.
6. How does a consumer attain equilibrium in case of two commodities under the cardinal
utility theory?
7. A consumer consumes only two goods. Explain his equilibrium with the help of utility
approach.
8. How is equilibrium achieved with the help of indifference curve approach?
9. Explain the concept of Marginal Rate of substitution with the help of schedule and diagram.
Give reasons behind diminishing MRSxy.
10. Explain difference situations/ conditions under which budget line shifts. Use diagram.
11. The following utility schedule of a person

Amount                1              2              3              4              5
Consumed

Marginal              5              4              3              2              1
utility(Units)

Suppose that the commodity is sold for Rs. 3, how many units of the commodity the person
will purchase, so that his TU is maximum.

12. Suppose the price of commodity is given as Rs.8 and the Marginal utility schedule in terms of
money 4 units is given as:
Unit                 1             2              3            4
Consumed

Marginal             12             10              8              6
utility(Units)

13. Explain any 3 determinants of Demand for a commodity for a household.
14. State any 2 factors that affect a household demand of a commodity. How do they affect it?
15. How does the change in the price of related goods affect the demand of a commodity?
Explain.
16. Explain the effects of rise in prices of related goods on demand of a good.
17. How will an increase in the price of a coffee affect the demand for tea? Explain with
diagram.
18. X and Y are substitute goods. Explain the effect of fall in the price of X on the demand of Y.
19. When is a good called (i) normal good & (ii) an inferior good.
20. Given meanings of normal goods and inferior goods. Give two examples each.
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21. Distinguish between substitute goods & complementary goods. Two examples each.
22. Explain the law of demand with the help of a demand schedule.
23. Distinguish between a movement along a demand curve and shift in the demand curve with
the help of diagram.
24. What is market demand? Give meaning of (i) change in demand; (ii) change in quantity
demanded.
25. Distinguish between expansion of demand with the help of diagram.
26. Distinguish between increase in quantity demanded an increase in demand.

(To be submitted in A4 size sheet file)

1. Explain in brief management as an activity?

2. Explain ‘Management of people’ as a dimension of management?

3. Clarify the term efficiency and effectiveness of management?

4. How does management help in the development of society?

5. State why management is not a Pure Science?

6. Discuss the basic features of management as a profession?

7. Describe, in brief, the functions of top level management in an organization?

8. Discuss the functions of management in brief?

9. Discuss the meaning and nature of coordination?

10. Write any four feature of scientific management?

11. Explain “Differential Piece Rate” and “Functional Foremanship” as
techniques of scientific management?

12. “Management is a profession like medical or legal profession” Do you agree
with this statement? Give reasons in support of your answer?

13. “Anything minus management is zero.” Explain the importance of
management in light of the statement?

14. Compare the principles of management propounded by Taylor and Fayol?
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15. Explain any three principles of management propounded by Fayol?

16. Under the techniques of principles of management propounded by Taylor,
Explain four types of study?

17. What does scientific management mean?

18. Explain the principle of scientific management given by Taylor?

19. What contradiction do you find in the principles of “Unity Of Command
“and the technique of “Functional Foremanship” and why?

20. Any one question of your choice?

ACCOUNTANCY

1. Define partnership.
2. What is the limit for number of partners in a firm?
3. Describe essential features of partnerships.
4. State the main contents of partnership deed.
5. What rules should apply in the absence of partnership deed?
6. What is goodwill?
7. What is super profit?
8. Why is there a need for valuation of goodwill?
9. What are the 5 formulae for calculating equal amount of drawings
withdrawn at different intervals .
10. On what occasions does the balance in fixed capital account change
NUMERICALS ON THE FOLLOWING:
11. Preparation of P&L Appropriation Account.
12.Preparation of Partners Fixed Capital and Fluctuating capital account
including Partners current account .
13.Calculation of interest on drawings(Product method)
14.Calculation of interest on capital.
17.Guarantee of Profit(by one partner)
18. Guarantee of Profit(by all partners)
19.Calculation of goodwill(all 3 methods)

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20.Any one question of your choice

************

(To be submitted in A4 size sheet in file form)

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