Holiday Homework (2017-18)
Class: XII
Physics
Q1. The magnitude of the electrostatic force between two identical ions that are separated by a distance
of 5.0 X1010 m is 3.7 X109N. (a) What is the charge of each ion? (b) How many electrons are
“missing” from each ion (thus giving the ion its charge imbalance)?
Q2. Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of
0.108 N when their center-to-center separation is 50.0 cm. The spheres are then connected by a thin
conducting wire. When the wire is removed, the spheres repel each other with an electrostatic force of
0.0360 N. Of the initial charges on the spheres, with a positive net charge, what was (a) the negative
charge on one of them and (b) the positive charge on the other?
Q3. Particle 1 of charge +1.0 µC and particle 2 of charge -3.0 µC are held at separation L= 10.0 cm on
an x axis. If a particle 3 of unknown charge q3 is to be located such that the net electrostatic force on it
from particles 1 and 2 is zero, what must be the (a) x and (b) y coordinates of particle 3?
Q4. The magnitude of the electrostatic force between two identical ions that are separated by a distance
of 5.0x10-10 m is 3.7x10-9 N. (a) What is the charge of each ion? (b) How many electrons are “missing”
from each ion (thus giving the ion its charge imbalance)?
Q5. Calculate the number of coulombs of positive charge in 250 cm3 of (neutral) water.
Q6. An electric dipole consisting of charges of magnitude 1.50 nC separated by 6.20 mm is in an
electric field of strength 1100N/C. What are (a) the magnitude of the electric dipole moment and (b) the
difference between the potential energies for dipole orientations parallel and antiparallel to E?
Q7. Figure shows two charged particles on an x axis: -q =-3.20 x 10_19 C at x =-3.00 m and q = 3.20 x
10_19 C at x =3.00 m. What are the (a) magnitude and (b) direction (relative to the positive direction of
the x axis) of the net electric field produced at point P at y = 4.00 m?
Q8. An electric dipole consisting of charges of magnitude 1.50 nC separated by 6.20 µm is in an
electric field of strength 1100 N/C. What are (a) the magnitude of the electric dipole moment and (b)
the difference between the potential energies for dipole orientations parallel and antiparallel to E?
Q9.How much work is required to turn an electric dipole 180o in a uniform electric field of magnitude
E =46.0 N/C if the dipole moment has a magnitude of p =3.02 x 10-25 Cm and the initial angle is 64o?
Q10. Space vehicles traveling through Earth’s radiation belts can intercept a significant number of
electrons. The resulting charge build up can damage electronic components and disrupt operations.
Suppose a spherical metal satellite 1.3 m in diameter accumulates 2.4 µC of charge in one orbital
revolution. (a) Find the resulting surface charge density. (b) Calculate the magnitude of the electric
field just outside the surface of the satellite, due to the surface charge.
Q11. An isolated conductor has net charge 10x 10-6 C and a cavity with a particle of charge q = 3.0 x
10-6 C. What is the charge on (a) the cavity wall and (b) the outer surface?
Q12. The electric field in a region of space has the components Ey = Ez 0 and Ex =(4.00 N/C)x. Point
A is on the y axis at y =3.00 m, and point B is on the x axis at x 4.00 m. What is the potential difference
VB -VA?
Q13. In Fig. what is the net electric potential at point P due to the four particles if V = 0 at infinity, q=
5.00 fC, and d= 4.00 cm?
Q14. The capacitors in Figure are initially uncharged. The capacitances are C1 =4.0 µF, C2 =8.0 µF,
and C3 =12 µF, and the battery’s potential difference is V =12 V. When switch S is closed, how many
electrons travel through (a) point a, (b) point b, (c) point c, and (d) point d? In the figure, do the
electrons travel up or down through (e) point b and (f) point c?
Q15. Figure 25-48 shows a parallel-plate capacitor with a plate area A = 7.89 cm2 and plate separation d
= 4.62 mm. The top half of the gap is filled with material of dielectric constant k1 =11.0; the bottom
half is filled with material of dielectric constant k2 =12.0. What is the capacitance?
ENGLISH WORKSHEET
1) What changes did the narrator find in the school when the order from Berlin came?
2) “It was their way of thanking our master for his forty years of faithful service and of
showing their respect for the country that was theirs no more.”
How did the people show their respect for M. Hamel? What values did they hold and what
values had they failed to live in their lives? Why is it important to conduct our lives with
certain values?
3) ’Lost Spring’ explains the grinding poverty and traditions that condemn thousands of
people to a life of abject poverty. Do you agree? Why/Why not?
4) The bangle makers of Firozabad make beautiful bangles and make everyone happy but
they live and die in squalor. Elaborate.
5) “I crossed to oblivion, and the curtain of life fell.” What was the incident which nearly
killed Douglas and developed in him a strong aversion to water?
6) “…….there was terror in my heart at the overpowering force of the waves.” When did
Douglas start fearing water? Which experience had further strengthened its hold on his
mind and personality?
7) The astrologer’s prediction about the death of the Tiger King came to be true. Do you
agree with this statement?
8) How does the poet try to overcome her fears at the time of parting from her mother?
9) Write an article on:
a) Does modern lifestyle make us disease prone?
b) Role of Youth in Communal Harmony
10) a) Draft a classified advertisement for the Lost and Found column of a newspaper stating
the loss of your briefcase.
B) You want to let out a house. Draft a suitable advertisement.
11) Read the novel “The Invisible Man.”
Computer Science(C++) Q.1What is an abstract class ? How is it different from a concrete class? Q.2 What is OOP Paradigm? How is it different from Procedural Programming Paradigm? Q.3 What is polymorphism ?Give an example in C++ to show how it is implemented in C++? Q.4 What is inheritance? Give an example in C++ to show how it is implemented in C++? Q.5 What are the advantages of OOPS over traditional programming approach? Q.6 What are the disadvantages of using OOP? Q,.7 What is concept of simplifying a real worlds concept into essential elements called in OOP? Explain this feature? Q,.8 What is most fundamental approach of combining data and its associated operations called in C++. Explain this feature? Q.9 What is a class? What is need of classes in C++? Q.10 Which functions in classes in C++ are inline by default. What is significance of these functions? Q.11.What happens if no constructor is provided by the user in a class . Q.12 When is memory allocated to a constructor? Q.13 Reusability of classes is one of the major properties of OOP. How is it implemented in C++? Q.14 Define a class hotel with the following specifications : Private members : Roomno integer Name string Charges_day float No_of_days integer
Compute() -To calculate and return the total charges as charges_day * No_of_days
Public members : Getit() -to enter the data members Showit() to show the data member A constructor function to initialize the data members. Q.15 Define a class Stock with the following specifications : Private members : Itemno integer Item Name string Price,qty,total ,discount float
Compute() -To calculate and return the total .Find discount as If qty >=50 discount=10%on total amount If qty<50 discount =nil Public members : Getit() -to enter the data members Showit() -to show the data member A constructor function to initialize the data Q.16 CONSIDER a class Item with the following specifications : Class Item { Private : int Ino ; char IName[25]; float Price Public: Item(); //f1 Item (int n,char nm[25],float rate); //f2 Item(Item &obj); //f3 } a) Write function definitions for all the member functions. b) Name the feature of OOP implemented in above class. c) Write the constructor invocation statement for the above functions. Q.17 CONSIDER a class emp with the following specifications : Class emp { Private : int eno ; char eName[25]; float sal; Public: emp(); //f1 emp (int n,char nm[25],float sal); //f2 emp(emp &E); //f3 } a) What are member functions f1..f3 called in C++. b) Name the feature of OOP implemented in above class. c) When and how the above functions are invoked . Q.18 CONSIDER a class Movie with the following specifications :
Class Movie { Private : int Mno ; char Mname[25];
int no_cdl; Public: Movie(); //f1 Movie (int n,char nm[25],float sal); //f2 Movie (Movie &m); //f3 } a) What are member functions f1..f3 called in C++. b) Name the feature of OOP implemented in above class. c) When and how the above functions are invoked . Q.19 CONSIDER a class Result with the following specifications : Class Result { Private : int Rno ; int mks; Public: Result(); //f1 Result (int rn,int marks); //f2 ~ Result( ); //f3 } a) What are member functions f1..f3 called in C++. b) Name the feature of OOP implemented in above class. c) When and how the above functions are invoked . Q.20 CONSIDER a class Candidate with the following specifications : Class Candidate { Private : int Cno ; char Name[20]; int mks; Public: Candidate(); //f1 Candidate(int Cn,char nm[20],int marks); //f2 ~ Candidate( ); //f3 } a) What are member functions f1..f3 called in C++. b) Write definitions for all functions. c) Create an object for f1 and f2 to invoke them. Project Work Topics:
• Any software or tool
• School Management, Banking Management
• Library information, Hotel management, Hospital management
• Transport query system, Computer learning system, Tutor
• Quizzes/Games
Data collection and analysis :
Choose any topic as your project for XII (a group of three maximum students )
· Collect data about the system (bills,reports,register)
· Analyse the inputs and outputs
ENGINEERING GRAPHICS
1) Draw isometric projections of solid in workbook from pages 1 to 16
2) Draw Treads (Pages No. 17 and 18)
3) Complete 15 machine block file
Biology
Chapter-1 Reproduction in organisms
Chapter-2 Sexual Reproduction in plants
Chapter-3 Sexual Reproduction in animals
Chapter-4 Reproductive Health
All questions of NCERT to be done. Learn them .Write in Homework copies and do the
extra questions in class work copies.
Practical Work
1. Experiment 1-Study germination of pollen grains.
2. Experiment 2-Disease causing organisms
3. Experiment 3-T.S. of Testes, T.S. of ovaries.
Project Work- Plan your project .Collect material and pictures.
CHEMISTRY
Q.1: Revise all NCERT Questions of Chapter-1, 2, 3, 4 and 5.
Q.2. Solve and do the following questions in Holiday Homework copy:
Chapter-2 Solution
1) Heptane and octane forms an ideal solution at 373K.The vapour pressure of pure
liquids at this temperature are 105.2kPa and 46.8 kPa respectively. If the solution
contains 25g of heptane and 28.5g of octane, calculate
i) Vapour pressure exerted by heptane.
ii) Vapour pressure exerted by solution.
iii) Mole-fraction of octane in the vapour phase.
2) On dissolving 19.5g of CH2FCOOH in 500g of water, a depression of 10C in freezing
point of water is observed. Calculate the van’t Hoff factor and dissociation constant of
fluoroacetic acid. Kf =1.86 K Kgmol-1.
3) What is the freezing point of 0.4 molal solution of acetic acid in benzene in which it
dimerises to the extent of 85%.Freezing point of benzene is 278.4K and its molar heat of
fusion is 10.042 KJmol-1.
4)A 1.00 molal aqueous solution of trichloroacetic acid (CCl3COOH) is heated to its
boiling point .The solution has the boiling point of 100.180C. Determine the van’t Hoff
factor for trichloroacetic acid. Kb for water is 0.512 K Kgmol-1.
Chapter-4 Chemical Kinetics
1) The rate constants of a reaction at 500K and 700K are 0.02s-1 and 0.07s-1
respectively . Calculate the value of activation energy for the reaction.
2) The decomposition of N2O5(g) is a first order reaction with a rate constant of 5x10-4s-1
at 450C.
2N2O5(g) → 4NO2(g) + O2(g).
If initial concentration of N2O5 is 0.25M, calculate its concentration after 2min. Also
calculate half-life for decomposition of N2O5 (g).
3) For the decomposition of azoisopropane to hexane and nitrogen at 543K, the
following data are obtained.
t(sec) P(mm of Hg)
0 35.0
360 54.0
720 63.0
Calculate the rate constant.
4) The experimental data for decomposition of N2O5 is
2N2O5 → 2NO2 + O2
In gas phase at 318 K are given below:-
t/s 0 400 800 1200 1600 2000 2400 2800 3200
102x[N2O5]/molL-1 1.63 1.36 1.14 0.93 0.78 0.64 0.53 0.43 0.35
i) Plot [N2O5] against t.
ii) Find the half-life period for the reaction.
iii) Draw a graph between log [N2O5] and t.
iv) What is rate law?
V) Calculate rate constant.
vi) Calculate half-life period from k and compare it with ii).
BUSINESS STUDIES
ACCOUNTANCY HOLIDAY HOMEWORK
1) Do all scanner series related to partnership from page (S.20 TO S.60) 2) DO the given project work 3) Revise all topics thoroughly
Holiday –Home Work
Assignment Work
Sub- Political-Science
Class – XII
Solve all the following questions in a file /register. 1. What do ASEAN and FTA stands for?
2. Mention any 4 common features of EU.
3. How has the EU risen to being a supranational organization? What are its limitations?
4. What was Marshall Plan? How did it pave the way for the formation of OEEC?
5. Highlight any 4 drawbacks in the changed Chinese economic system?
6. What role has been played by the EU in solving the problems of European countries?
7. When was the EU established? Mention any 2 kinds of influences that were exercised by the EU.
8. Explain the factor responsible for the rise of Chinese economy.
9. Explain the vision of ASEAN 2020.
10. In 1992 which regional organization was formed?
11. What steps should be taken to strengthen the ASEAN in the international community?
12. Examine the changing Indo-China relation.
13. Explain the role of emerging alternative centers of power into sperious economy?
14. ‘India and China are emerging great economic powers’. Do you agree? Justify with 3 arguments.
15. What were the objectives behind the formation of ASEAN in 1967?
16. In the EU flag, What does the symbol of 12 gold star in a circle mean ?
17. What is meant by ASEAN way?
18. Why is the EU considered a highly influential regional organization in the economic, political and
military field?
19. When was the regional forum established? What was its main objective?
20. Map- On the political map of Europe mark-1)3 old members of EU 2) 2 new members of EU
21. Explain the new economic policy of China since 1978.
22. Name any 2 members state of the EU who are the permanent members of security council.
23. Study the cartoon of dragon from chapter 4 and answer the following-a) identify the country b) which 2
symbols help in identifying in the country c) what message does the cartoon convey to the world.
24. Name the member countries of SAARC.
25. Name the member countries included in south asia.How can peace and co-operation be enhanced in
this region?
26. Explain India’s changing relationship with Pakistan?
27. Mention any 2 objectives of SAARC.
28. What are major diff. b/w SAARC and EU as an alternative centre of power.
29. Like India, Why could demo not take roots in Pak despite the fact that both the countries share a
common past?
30. Describe any 4 consequences of the Bangladesh war 1971?
31. Analyze the common problems of south asian countries 2012.
32. Despite the mixed record of demo experience, the people of all the countries of south asia share the
same aspiration of demo?
33. Who signed Tashkent agreement and when?
34. Describe any2 major issues of conflict b/w India and Pak leading to war of 1971?
35. What is full form of SAARC?
36. The SAFTA was signed by the members of-------------------in the yr------------------
……………….THE END…………………….