DELHI PUBLIC SCHOOL, BPKIHS, DHARAN, NEPAL-2014
SUMMER VACATION HOLIDAY HOMEWORK
CLASS XII
NAME:__________________________
MONTH: MAY
SECTION: ______
ROLL No. ____
ENGLISH
I. Answer the following question:
A.
Notice:
(5 marks)
Your areRakesh/Rakhi, the secretary of L.M Residents' Welfare Society, Green Park extension, Channel. Write a
notice requesting the members of the society to attend a meeting to discuss the problem of security of the members in
the wake of recent burglaries, thefts and chain snatching incidents. Do not exceed 5o words.
B. Poster:
(5 marks)
Draft a poster for a Road Safety Week Campaign being organized by the traffic police of your area. High light the
need of safed riving and some do's and don'ts for the driver.
C. Advertisement
(5 marks)
Suppose your family is migrating to a new place and you want to dispose of some furniture. Write an advertisement to
be published in a national newspaper, giving necessary details of the articles, expected price, contact address etc.
D. Report
(10)
Suppose you are a student of Asha Model School, Mangalore. The school organized an inter-school English Debate
competition last week on the motion, 'Modern Teacher : A true Nation Builder". Write a report on the competition in
about 100-125 words including all necessary details like the number of teams that participated, conclusion of the
moderator. The results, the Chief Guests speech etc.
E. Letter
(10 marks)
You are GangadharanAdhopadhya. You recently bought an inverter from M/s Coronet Electronics, Faridabad. Now
you find that the inverter is not working properly. The local electrician who examined it at your request has told you
that its capacitors are malfunctioning. Write a letter to the dealer informing about the snag & asking him to replace it
with a new piece as per the terms & conditions of the sale. Do quote the cash memo number, date of purchase, model
number of the inverter and the validity of the guaranteed period.
F. Literature
(3x5=15)
1. Why did M. Hamel put on his fine Sunday clothes? What prompted the villagers to attend the last lesson by M.
Hamel ?
2. "Poverty is the vicious cycle of refugees, slum dwellers and bangle markers". Discuss in the light of 'Lost Spring".
3. What different images and symbols does the poet use to convey the idea of he mother's old age and imminent
death ? (My Mother At Sixty-six)
4. What makes Aunt Jennifer's Character tragic and pathetic?
5. Does Kalki advocate tiger hunting or condemit ?discuss on the basis of the story. "The Tiger King".
Note:- Do the above in separate assignment sheet and submit it is a stick file.
MATHEMATICS
(A). Draw the graph of following functions and also write its domain , range and period .
1. (a) f (x) = x
(b) f (x) = 𝑥 2 (c) f (x) = 𝑥 3
(d) f (x) = 𝑥 2𝑛 , n 𝜖 𝑁
(e) f (x) = 𝑥 2𝑛−1 , n ϵ N
1
2. (a) f (x) = 𝑥
1
1
(b) f (x) = 𝑥 2
1
1
(c) f (x) = 𝑥 2𝑛 , n 𝜖 𝑁
1
(d) f (x) =
1
𝑥 2𝑛−1
,nϵN
1
3. (a) f (x) = 𝑥 2
(b) f (x) = 𝑥 3 (c) f (x) = 𝑥 2𝑛 , n 𝜖 𝑁 (d) f (x) = 𝑥 2𝑛−1 , n ϵ N
4. (a) f (x) = l x l
(b) f (x) = Sgn (x)
(c) f (x) = {x}
(d) f (x) = [x]
5. (a) f (x) = sin (x) (b) f (x) = cos (x)
(c) f (x) = tan (x)
(d) f (x) = cosec (x)
(e) f (x) = sec (x)
(f) f (x) = cot (x)
−1
6 . (a) f (x) = 𝑠𝑖𝑛 (x)
(b) f (x) = 𝑐𝑜𝑠 −1 (x) (c) f (x) = 𝑡𝑎𝑛−1 (x) (d) f (x) = 𝑐𝑜𝑠𝑒𝑐 −1 (x)
(e) f (x) = 𝑠𝑒𝑐 −1 (x)
(f) f (x) = 𝑐𝑜𝑡 −1 (x)
7. (a) f (x) = 𝑠𝑖𝑛−1 (sin x) (b) f (x) = 𝑐𝑜𝑠 −1 (cos x)
(c) f (x) = 𝑡𝑎𝑛−1 (tan x)
(d) f (x) = 𝑐𝑜𝑠𝑒𝑐 −1 (cosec x) (e) f (x) = 𝑠𝑒𝑐 −1 (sec x)
(f) f (x) = 𝑐𝑜𝑡 −1 (cot x)
8. (a) f (x) = sin (𝑠𝑖𝑛−1 x) (b) f (x) = cos (𝑐𝑜𝑠 −1 x)
(c) f (x) = tan (𝑡𝑎𝑛−1 x)
(d) f (x) = cosec (𝑐𝑜𝑠𝑒𝑐 −1 x) (e) f (x) = sec (𝑠𝑒𝑐 −1 x)
(f) f (x) = cot ( 𝑐𝑜𝑡 −1 x)
PROJECT WORK : (1). History of relations and functions .
(2). History of Inverse Trigonometric functions .
PHYSICS
1. The introduction of a dielectric slab between the capacitor plates increases the capacitance. Why?
1
2. In a certain 0.1 m3 of space electric potential is found to be 5 V throughout. What is the electric field in the
region?
1
3. Two wires A and B are of same metal, have the same area of cross section and have their length in ratio 2 : 1. What
will be the ratio of currents flowing through them respectively when the same potential difference is applied across
the length of each of them?
1
4. Alloy of metal have greater resistivity than their constituent metals. Why?
1
5. Give two differences the nature of electric potentials of a single point charge and an electric dipole.
2
6. Using Gauss’ theorem, show that the interior of a conductor can have no excess charge in static condition.
2
7. Derive the vector form of Ohm’s law.
2
8. The resistivity of a wire is R ohm. Find its new resistance if it is stretched to n times its original
length.
2
9. Two point charges of charge values Q and q are placed at distance x and x/2 respectively from a third charge of 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 is zero.
2
10. Derive an expression for the potential energy of an electric dipole in a uniform electric dipole. Hence discuss the
condition of its stable equilibrium.
3
11. Derive an expression for the energy stored in a capacitor with air as the medium between its plates. How does the
stored energy change if air is replaced by a medium of dielectric constant k?
3
Or
What is a dielectric? A dielectric slab of thickness t is kept between the plates of a parallel plate capacitor separated
by distance d. derive the expression for the capacitance of the capacitor for t<< d.
12. A 4 µF capacitor is charged by a 200V supply. it is then disconnected from the supply and is connected to another
uncharged 2µF capacitor. How much electrostatic energy of the first capacitor is lost in the form of heat and
electromagnetic radiation?
3
13. Define electric dipole moment. Derive an expression for the electric field intensity at any point along axial and
equatorial line of an electric dipole.
3
14. Two cells of emf E1 and E2 and internal resistance r1 and r2 respectively are connected in series. Deduce expressions
for the equivalent emf and equivalent internal resistance of the combination.
3
15. Two metallic wires of the same material and same length but different cross- sectional areas are joined together (i) in
series (ii) in parallel, to source of emf. In which of the two wires will the drift – velocity of electron be more in each
of the two cases and why?
3
Or
Define the term resistivity of a conductor. Give its SI unit. Show that the resistance of a conductor is given by
𝑚𝑙
R=𝑛𝑒2𝜏𝐴 , where the symbols are have their usual meanings.
16. A charge q is distributed uniformly over a ring of radius ‘a’. Obtain an expression for the electric intensity E at a point
on the axis of the ring. Hence show that for point’s at large distance from the ring, it behaves like a point charge.
3
17. State Kirchhoff’s laws for an electrical network. Using it, find the relation between the resistances of four arms of
Wheatstone bridge when the bridge is balanced.
Draw a circuit diagram to determine the unknown resistance of a metallic conductor using a meter bridge.
5
Or
Define the term potential gradient. Using this concept, explain the method for comparison of emfs of two primary
cells using a potentiometer. Establish the relation used. Write two possible cases of potentiometer. Establish the
relation used. Write two possible causes of potentiometer giving only one sided deflection.
18. State Biot- Savart’s law. Use it to be obtain the magnetic field, at an axial point, distance r from the center of a
circular coil of radius a carrying a current I. hence, compare the magnitude of the magnetic field of this coil at the
center and at an axial point for which r=√3 a.
5
19. Give the principle of working of a Van de Graaff generator. With the help of labeled diagram, describe its
construction and working. How is the leakage of charge minimized from the generator?
(a) What is an equipotential surface? Sketch equipotential surface for two equal and positive charges separated by a
small distance.
(b) Define electric potential energy of a charge system. Derive an expression for the potential energy of a three point
charge system.
CHEMISTRY
1. A compound AB2 possesses CaF2 type structure. Write the coordination number of A2+and B- ions.
2. Define relative lowering of vapour pressure and write a mathematical expression for it.
1
3. Under what condition do the non-ideal solutions show positive deviation ?
4. Write the relationship between specific and equivalent conductance of an electrolytic solution.
5. What is the EMF of the cell when the cell reaction attains equilibrium?
6. Why reaction rate increases with increase in the surface area of the reactants?
7. Which aqueous solution has higher concentration 1 molar or 1 molal ?Why ?
8. (a) Why FeO is non-stoichiometric with the formula Fe0.95O ?
(b) Which transition metal oxide has conductivity and appearance same as that of copper metal?
9. A 6.90 M solution of KOH in water contains 30% by mass of KOH. Calculate the density of the KOH
solution. (molar mass of KOH = 56 g mol-1 ?
2
10. (a) Why Frenkel defects are not found in alkali metal halides ?
(b) Why crystal defects are called thermal defects ?
11. An aqueous solution of glucose boils at 100.01°C. The molal boiling point elevation constant for water is
0.5 K kg mol–1. What is the number of glucose molecule in the solution containing 100 g of water.
12. What quantity of chlorine can be produced by the electrolysis of molten NaCl with a current of 1.02 A for 15 min?
13. The rate of a particular reaction quadruples when the temperature changes from 293K to 313K. Calculate activation
energy.
2
14. The vapour pressure of pure liquids A and B are 450 and 750 mm Hg respectively at 350K. Find out the composition
of the liquid mixture if total vapour pressure is 600 mm Hg. Also find the composition of the vapour phase.
15. The unit cell of an element of atomic mass108 and density 10.5 g/cc. is a cube with edge length 409 pm. Find the
structure of the crystal lattice.
3
2+
3+
16. Analysis shows that a metal oxide has an empirical formula M0.96O1.00. Calculate the %age of M M ions in the
lattice.
3
++
+
0
2+
0
+
17. for the standard cell : Cu(s)/Cu (aq) || Ag (aq)/Ag(s), [ E Cu /Cu = + 0.34 V, E Ag /Ag = +0.80 V ]
(i) Identify the cathode and the anode as the current is drawn from the cell.
(ii) Write the reaction taking place at the electrodes.
1
1
1
1
1
2
2
2
2
2
3
(iii) Calculate the standard cell potential.
18. A first order reaction takes 69.3 min for 50% completion. Set up on equation for determining the time needed
for 80% completion.
3
19. (a) Write the differences between order and molecularity of reaction.
(b) Why instantaneous rate is preferred over average reaction rate?
20. (a) What do you mean by :
(i) negative standard electrode potential and
(ii) positive standard electrode potential ?
(b) Which cell is generally used in hearing aids? Name the material of the anode, cathode and the electrolyte.
Write the reactions involved.
(c) Iron does not rust even if Zinc coating is broken in agalvanised iron pipe but rusting occurs much faster if tin
coating over iron is broken. Explain.
21. Purification of drinking water is a big problem. In your locality, vendors of various companies are promoting RO
units for purification of water for domestic use irrespective of whether it is required or not. Answer the following
questions:
(i) What is the meaning of RO?
(ii) Would you recomend the installation of RO units in all the areas?
(iii) Support your views with reasons.
BIOLOGY
1 A moss plant produces a large amount of antherozoids but few egg cells .Why?
1
2 Name the type of flowers which favors cross pollination.
1
3 What is the function of leydig cells.
1
4Why is Cu-T considered good contraceptive device to space children.
1
5 Draw a schematic labelled diagram of a fertilized embryo sac of an angiosperm.
2
6 Name the hormones produced only during pregnancy in human females.Why is colostrums essential for newborn
babies.
2
7Write the function of each of the following
AFimbriae
b.coleoptile
c oxytocin
3
8 Why do flowering plants need to develop outbreeding devices?Explain any three of them.
3
9 Pea plants produce assured seed sets. Give a reason. When a tall plant was self pollinated one fourth of the progeny
were dwarf. Give the genotype of the parent and dwarf progenies.
3
10Awoman with blood B married a man with blood group A. They had two sons and both had blood group O .
show the possibility of such inheritance. list the alleles involved.
3
11Explain monohybrid cross taking seed coat as a trait in Pisumsativum. Work out the cross upto F2 generation. 5
12Where is morula formed in humans?Explain the process of its development from zygote.
5
13Why is fertilization in an angiosperm called double fertilization?Mention the ploidy of the cells involved.Draw a
labelled diagram of L.S of an endospermous monocot seed.
5
14a)Explain the mutually rewarding relationship between Yucca plant and species of moth.
b)Explain the characteristic features of wind pollinated flowers.How are insect pollinated flowers different from
them.
5
PROJECT
Make an investigatory project from your syllabus(topics can be selected from topics given in biology practical book).
INFORMATICS PRACTICES
1.
2.
3.
4.
5.
6.
7.
Java is both a programming language and a platform. Comment.
Briefly write the history of Java.
What is role of JVM in platform independence?
What are different characteristics of Java?
How are events, message, methods and properties interrelated?
Discuss data types used in Java with their types and also give suitable example for each.
Start a new project. Add a new frame to it. Perform the following stepsa. Place two push buttons and one text field in your form
b. Change some of their properties like font, fore color etc.
1
1
2
2
3
3
4
3
5
5
5
8.
9.
10.
11.
12.
c. Change the text of Display Button to “Display Message” and of Exit Button to “Exit”.
d. Write down the coding for all these controls so that it can perform the following actionsi.
On starting the application, text field should display the message1. “Welcome to Java GUI Programming”
ii.
On clicking the “ Display Message” button, text field should display the message
1. “Isn’t it easy to work in Net Beans”
iii.
When Exit is clicked, change the contents of text field to OK then BYE!”
Design a GUI application as shown to following screenshot. The application should obtain age of a student and then
display the age of student in 2015 in a lable.
3
Name the character set supported by Java?
What is meant by token? Name the tokens available in java. Also discuss different tokens in detail with suitable
example.
3
What are keywords? Explain in detail. How are keywords different from identifiers?
4
Develop an application tom prepare students result on the basis of marks entered. A sample screenshot is being shown
below3
a. Create a command button on this form and write program on click event of command button to calculate the
Total marks and average in the given box.
13. Develop an application that accepts principal amount, rate of interest and time from the user. Then it computes the
simple interest and displays it. (Design the form as per the requirement)
3
14. Design a Form that will contain three text fields for getting two numbers from the users and showing result, four
command buttons for Add, Subtract, Multiply, Divide the given numbers. Write code for click event of each
command button to perform the operation as per the command.
3
15. Determine the data types of the expression2
a.
   pq    ( p  r ) / s 

  

 (q  r )   (long )( s  p) 
 2 x  3 y 8t 
 
 5w  6 z 5u 
b. 
If p, x is an int. r, w is a float. q, y is a long and s, z is double, t is short and u is long double.
16. Find the output of the following code fragmenta. int f =1, i=2;
b. Public static void main(string xyz[]){
while (++i<5)
int i=1;
f*=i;
while(i<10) {
system.out.println(f);
System.out.print(i);
i=i*2; }} :
3
17. Convert following code into an equivalent do-while loop:
2
inti,j;
for (i=10,j=20;j>=10;j=j-2)
i++;
18. Name the data types that can be used in switch statements.
1
19. What are the different constructs of flow of control used in a program? Discuss with example. 3
20. Differentiate between a container and a component.
2
21. Discuss some containers and some child controls used in Java.
2
Project Work Create a file and maintain 10 Java Programs. All programs should be printed and must contain form to accept the data.
Give the output screen for each program.
COMPUTER SCIENCE
1. Differentiate between object oriented programming and procedural programming with the help of examples of each.
2
2. What is the difference between ‘=’ and ‘==’?
1
3. What will be value of the following if M=10, justify:
2
a. (5 * M++) / 12
b. (5 * ++M) / 12
4. Name the header files for the following functions
18
clrscr()
setw()
gets()
toupper( )
putchar()
islower()
sqrt()
printf()
strcmp()
open()
randomize()
pow()
abs()
strlen()
isalpha()
puts()
getchar()
get()
floor()
cos()
gotoxy()
exp()
setprecision( )
strcpy()
getc()
strlen()
ceil()
fabs()
frexp()
modf()
4. Write a program to print cube of any number.
2
5. Write a C++ program that inputs student’s marks in three subjects (out of 100) and prints the total and percentage
marks with all information for all students.
3
10. Write equivalent C++ expressions for the following expressions:
2
2
a) ut + ½ ft
b) ((3x + 5y) / (5x + 3y) )
11. Define the following terms3
a) Operators
b) Library Function
c) Header Files
12. What do you mean by paradigm? Explain with their types.
3
13. Write advantages and disadvantages of OOP.
2
14. Write a program to read a number N and print N2, N3, N4 and N5.
3
15. Write a c++ program to generate the Fibonacci series for n terms
2
16. Write c++ program using function to find the factorial of a given number.
2
17. Write a c++ program using switch case structure to display the given numbers in words. (Enter number between
1 and 9).
2
18. Write a c++ program to check whether the given string is palindrome or not.
3
Project Work Create a file and maintain 15 C++ Programs. All programs should be printed and must contain all the steps to input
data. Write the output for each program.
ACCOUNTANCY
1. Enlist any two advantages and values revealed by a partnership deed.
2. Show the Journal entries related to payment of interest on a partner’s loan and for charging interest on the loan at the
end of an accounting period.
3. Which of the following statements cannot be regarded as a right of partner?
a) Every partner has the right to share profits or losses with other partners as per the agreement.
b) Only active partners have a right to take part in the management of the business.
4. What is the purpose behind preparation of Profit and Loss Appropriation Account?
5. What is the purpose behind preparation of Profit and Loss Appropriation Account?
a) A drew Rs 2,000 during the year, interest is to be charged @ 6 %.
b) A drew Rs 2,000 during the year, interest is to be charged @ 6% p.a.
c) A drew Rs 2,000 on April 01, 2010, Interest is to be charged @ 6%. Accounts are closed on December 31, every year.
d) A drew Rs 2,000 on April 01, 2010, Interest is to be charged @ 6% p.a. Accounts are closed on December 31, every
year.
e) A drew Rs 2,000 on April 01, 2010 and Rs 1,000 on Oct 01, 2010, interest is to be charged @ 6% p.a. Accounts are
closed on December 31, every year.
f) A drew Rs 200 in the beginning of each month throughout the year. Interest is to be charged @ 6% p.a. Accounts are
closed on December 31, every year.
g) A drew Rs 3,000 throughout the year. He drew regularly equal amount at end of every month. Interest is to be charged
@ 6% p.a.
h) A drew Rs 3,000 in the beginning of each quarter. Interest is to be charged 8% p.a.
In above case accounts are closed on December 31, every year.
BUSINESS STUDIES
1. Explain in brief , management as a group of people having managerial responsibility for the enterprises
2. Mr. NitinSinghania’s father has a good business of Iron and Steel. He want to go to USA for his MBA, but his
father wants that he should join the business. ON the basis of emerging trends, do you think that Mr. Singhania
should send his son to USA? Give any three reasons in support of your answer.
3. Write a shot note on the importance of management.
4. What are the three levels of management? State any three functions of the middle level management.
5. “Management is an art.” Do you agree with this statement? Give five reasons.
6. “In the absence of management the productive resources will remain resources and shall never become production.”
Explain the importance of management in the light of the above statement.
7. Explain any five features/characteristics of management.
8. “Management is neither as precise nor as comprehensive as the natural and pure sciences are.” Why? Explain.
9. Mohan, a manager of Bharat Ltd. Instructs a salesman to go slow in selling the product, whereas the marketing
manager is insisting on fast selling to achieve the target. Which principle of management is being violated in this
case? State any one of the consequences of violation of this principle.
10. Mohan, a manager, very often speaks to people at all levels, passing on instructions regarding his department and
also the other departments. Which principle of management is being overlooked and why?
11. What is meant by ‘scientific management ‘? Explain any three techniques of scientific management.
12. An organisation follows the principles of management. What are the positive effets of each of the following
principles of management on the organisation?
(i) Scalar chain,
(ii) Equity and ,
(iii) Division of work.
13. What is an economic environment and what are its major components?
14. Banking sector reforms have led to easier credit terms and better services. This is an example of a key component of
the ‘Business Environment.’ Name the components and explain it in brief.
15. Prepare one project our of the following topic:
(i)
Element of Business Environment.(Roll No 1-8)
(ii)
Principles of Management.(Roll No 9-16)
(iii)
Marketing Management(Roll No 17-24)
(iv)
Changing Role of Women and its Impact on Business Environment.(Roll No 25-33)
(v)
Prepare a project file and show the following in that.
1. Acknowledgement
2. Certificate.
3. Introduction:
Name:
Guide/Teacher Incharge:
School:
Class:
Roll No.
Index:
S.No
Description
Page No.
From To
Remarks by Teacher Incharge
ECONOMICS
Q1. When the price of a good is rs 13per unit, the consumer buys 11unit of that good when the price rises to rs 15 per
unit , consumer continues to buy 11units. Calculate price elasticity of demand.
Q2. Differentiate between fixed factors and variable factors.
Q3. Define law of variable proportion.
Q4. Explain causes of increasing returns to a factor.
Q5. Explain causes of diminishing returns to a factor.
Q6. Explain the difference between ‘decrease in demand’ and ‘decrease in quantity demanded’ with the help of a demand
schedule. Give two causes of decrease in demand.
Q7. Explain the concept of marginal rate of substitution. Explain the reaction of the consumer when marginal rate of
substitution is higher than the ratio of prices.
Q8. Explain two assumptions of law of diminishing marginal utility.
Q9. Explain three properties of an indifference curve.
Q10. Why does a total variable cost curve increases with increase in output. Why it increases with diminishing rate
initially and with increasing rate later on?
Q11. How is implicit cost different from explicit cost?
Q12. 8units of good are demanded at a price of rs 7 per unit. Price elasticity of demand is -1. At what price will he buy 12
units? Use expenditure approach of price elasticity of demand to answer this question.
Q13. A consumer consumes only two goods X and Y. At a certain consumption level of these goods, he find that the ratio
of marginal utility of price in case of X is lower than in case of Y. Explain the reaction of consumer.
Q14. Explain how a production possibility curve is effected affected when resources are inefficiently employed in an
economy.
Q15. Explain the problem ‘what to produce’.
Q16. How is production possibility curve affected by unemployment in the economy?
Q17. What is the significance of point of inflexion?