Holiday Homework (2017-18) Class: XII Ph ?· Holiday Homework (2017-18) Class: XII Physics Q1. The magnitude…

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• 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 C and particle 2 of charge -3.0 C 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 m 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 Earths 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 C 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 F, C2 =8.0 F,

and C3 =12 F, and the batterys 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 astrologers 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

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

• int no_cdl; Public: Movie(); //f1 Movie (int n,char nm,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; int mks; Public: Candidate(); //f1 Candidate(int Cn,char nm,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 vant 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 vant 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).

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...