INDIAN SCHOOL, AL-AIN

HOLIDAY ASSIGNMENT FOR SUMMER BRAEK 2018

GRADE- 12TH SCIENCE

================================================================================================= PHYSICS

1. Two capacitors of unknown capacitances C1 and C2 are connected first in series

and then in parallel across a battery of 100 V. If the energy stored in the two

combinations is 0.045 J and 0.25 J respectively, determine the value of C1 and C2. Also

calculate the charge on each capacitor in parallel combination.

2. A cell of e.m.f ‘E’ and internal resistance ‘r’ is connected across a variable load

resistor R. Draw the plots of the terminal voltage V versus (i) R and (ii) the current I. It is

found that when R = 4 Ω, the current is 1 A and when R is increased to 9 Ω, the current

reduces to 0.5 A. Find the values of the emf E and internal resistance r.

3. State the principle of working of a galvanometer. A galvanometer of resistance G

is converted into a voltmeter to measure upto V volts by connecting a resistance R1 in

series with the coil. If a resistance R2 is connected in series with it, then it can measure

up to V/2 volts. Find the resistance, in terms of R1 and R2, required to be connected to

convert it into a voltmeter that can read up to 2 V.

Also find the resistance G of the galvanometer in terms of R1 and R2.

4. a) Explain, using suitable diagrams, the difference in the behaviour of a (i)

conductor and (ii) dielectric in the presence of external electric field. Define the terms

polarization of a dielectric and write its relation with susceptibility.

(b) A thin metallic spherical shell of radius R carries a charge Q on its surface. A point

charge Q 2 is placed at its centre C and another charge +2Q is placed outside the shell at

a distance x from the centre as shown in the figure. Find (i) the force on the charge at

the centre of shell and at the point A, (ii) the electric flux through the shell.

5. a) State the underlying principle of a potentiometer. Why is it necessary to (i) use a long wire, (ii) have uniform area of cross-section of the wire and (iii) use a driving cell whose emf is taken to be greater than the emfs of the primary cells?

(b) In a potentiometer experiment, if the area of the cross-section of the wire increases

uniformly from one end to the other, draw a graph showing how potential gradient

would vary as the length of the wire increases from one end.

6. How is a toroid different from a solenoid? (b) Use Ampere’s circuital law to

obtain the magnetic field inside a toroid. (c) Show that in an ideal toroid, the magnetic

field (i) inside the toroid and (ii) outside the toroid at any point in the open space is

zero.

7. Two point charges + 3q and – 4q are placed at the vertices ‘B’ and ‘C’ of an

equilateral triangle ABC of side ‘a’ as given in the figure. Obtain the expression for (i) the

magnitude and (ii) the direction of the resultant electric field at the vertex A due to

these two charges.

8. A capacitor is connected in series to an ammeter across a d.c. source. Why does

the ammeter show a momentary deflection during the charging of the capacitor? What

would be the deflection when it is fully charged? (b) How is the generalized form of

Ampere’s circuital law obtained to include the term due to displacement current?

9. Figure shows two identical capacitors, C1 and C2, each of 1 µF capacitance

connected to a battery of 6 V. Initially switch 'S' is closed. After sometime 'S' is left open

and dielectric slabs of dielectric constant K = 3 are inserted to fill completely the space

between the plates of the two capacitors. How will the (i) charge and (ii) potential

difference between the plates of the capacitors be affected after the slabs are inserted?

10. Write the expression for the magnetic moment (M) due to a planar square loop

of side ‘l’ carrying a steady current I in a vector form.

In the given figure this loop is placed in a horizontal plane near a long straight conductor

carrying a steady current I1 at a distance l as shown. Give reasons to explain that the

loop will experience a net force but no torque. Write the expression for this force acting

on the loop.

11. In a meter bridge, the null point is found at a distance of 40 cm from A. If a

resistance of 12 Ω is connected in parallel with S, the null point occurs at 50.0 cm from

A. Determine the values of R and S.

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CHEMISTRY

SOLID STATE, SOLUTIONS, ELECTROCHEMISTRY AND CHEM. KINETICS 1. The molar conductivity of a 1.5 M solution of an electrolyte is found to be 138.9 S

cm2 mol–1.

Calculate the conductivity of this solution. 2

2. A reaction is of second order with respect to a reactant. How is its rate affected if

the concentration of the reactant is (i) doubled (ii) reduced to half? 2

3 .Copper crystallizes with face centred cubic unit cell. If the radius of copper atom

is 127.8 pm, calculate the density of copper metal. (Atomic mass of Cu = 63.55 u and Avogadro’s number

NA = 6.02 × 1023 mol–1) 3

4. The electrical resistance of a column of 0.05 M NaOH solution of diameter 1 cm

and length 50 cm is 5.55 × 103 ohm. Calculate its resistivity, conductivity and molar conductivity. 3

5. (a) Define the following terms:

5 (i) Mole fraction (ii) Ideal solution (b) 15.0 g of an unknown molecular material is dissolved in 450 g of water. The resulting solution freezes at – 0.34°C. What is the molar mass of the material? (Kf for water = 1.86 K kg mol–1)

OR

(a) Explain the following: (i) Henry’s law about dissolution of a gas in a liquid. (ii) Boiling point elevation constant for a solvent. (b) A solution of glycerol (C3H8O3) in water was prepared by dissolving some

glycerol in 500 g of water. This solution has a boiling point of 100.42°C. What mass of glycerol was dissolved to make this solution? (Kb for water = 0.512 K kg mol–1)

6. A voltaic cell is set up at 25°C with the following half cells:

Al/Al3+ (0.001 M) and Ni/Ni2+ (0.50 M) Write an equation for the reaction that occurs when the cell generates an electric current and determine the cell potential.

E O Ni /Ni 2+ = – 0.25 V; E o Al /Al3+ = – 1.66 V. (log 8 × 10–6 = – 0.54)

HALOALKANES AND HALOARENES, ALCOHOLS, PHENOLS AND ETHERS, ALDEHYDES, KETONES AND CARBOXYLIC ACIDS, AMINES 1. (a) Write chemical equations to illustrate the following name bearing reactions:

5 (i) Cannizzaro’s reaction (ii) Hell-Volhard-Zelinsky reaction (b) Give chemical tests to distinguish between the following pairs of compounds: (i) Propanal and Propanone (ii) Acetophenone and Benzophenone (iii) Phenol and Benzoic acid

2. (a) How will you bring about the following conversions: 5 (i) Ethanol to 3-hydroxybutanal (ii) Benzaldehyde to Benzophenone. (b) An organic compound A has the molecular formula C8H16O2. It gets hydrolysed with dilute sulphuric acid and gives a carboxylic acid B and an

alcohol C. Oxidation of C with chromic acid also produced B. C on dehydration reaction gives but-1-ene. Write equations for the reactions involved.

3. Give a chemical equation for each of the following reactions: 2 (i) Williamson’s synthesis (ii) Reimer-Tiemann reaction

4 Explain the mechanism of each of the following processes: 2

(i) Acid catalysed dehydration of an alcohol (ii) Hydration of ethene to yield ethanol.

5.. How are the following conversions carried out: 3

(i) Aniline to nitrobenzene (ii) Ethanamine to N-ethylethanamide (iii) Chloroethane to propan-1-amine

6. Give one chemical test each to distinguish between the compounds in the

following pairs: (i) Methylamine and dimethylamine

3 (ii) Aniline and benzylamine (iii) Ethylamine and aniline

7. Write the mechanism of the following reaction: CH3CH2 3CH2Br + H2O 8. Account for the following:

3 (i) Primary amines (R-NH2) have higher boiling point than tertiary amines (R3N). (ii) Aniline does not undergo Friedel–Crafts reaction.

(iii) (CH3)2NH is more basic than (CH3)3N in an aqueous solution.

9. 30. (a) Write the products formed when CH3CHO reacts with the following reagents: 5

(i) HCN (ii) H2N—OH (iii) CH3CHO in the presence of dilute NaOH (b) Give simple chemical tests to distinguish between the following pairs of compounds: (i) Benzoic acid and Phenol

(ii) Propanal and Propanone

10. (a) Account for the following: 5

(i) Cl—CH2COOH is a stronger acid than

CH3COOH. ii) Carboxylic acids do not give reactions of carbonyl group.

(b) Write the chemical equations to illustrate the following name reactions: (i) Rosenmund reduction (ii) Cannizzaro’s reaction (c) Out of CH3CH2 —CO—CH2—CH3 and CH3CH2—CH2—CO—CH3, which gives iodoform

test?

================================================================= BIOLOGY

1. Prepare an investigatory project on any topic of your own choice, given in your syllabus in which you are confident and prepare for viva voce .same project will be submitted at the time of Board practical exam.

2. Guidelines: (i) Project should be made on A 4 sized sheets (ii) Sheets should be arranged in following order. (iii) (a) Aim / Title Page (b) Certificate (c) Acknowledgement (d) Index (e) Main

content (f) Bibliography (iv) NOTE: (i) If topic has been taken from medical field, a separate case

history should be attached (ii) Maintain the standard of project (class XII board exam.)

3. Please make sure you write or print the project yourself (this fetches you extra marks). A good project (including case study) should consist of 15+ pages.

Paste as many diagrams and photographs regarding the topic as possible. Make it look appealing. Make sure that you understand the project really well, because you will need to score good on the viva too.

A great project and a poor viva will spoil the show. Think 5-10 questions about your project, which you think the examiner can ask you and prepare them well.

4. Complete the given worksheets (CHAPTER 5 & 6) in your Practice Note Book of Biology.

5. Practice the diagrams from the NCERT text two times

6. Refer CBSE question paper of last 5 years and write the answers

7. Write the answers for textual questions of unit I.

===========================================================================

ENGLISH

1. Make a project on one of the prevalent phobias found in human beings.(printed project: 6 pages)

2. Illustrate whether the ending of the novel is justified? What is your reaction when Griffin gets killed and Marvel gets to keep all the stolen money? Are you glad that the invisibility formula is hidden from Kemp, who could use it?

3. “All men, however highly educated retain some superstitious inkling”. Explain the line in context of Dr. Kemp's reaction at unusual sight in his house.

4. Once Griffin saw no drawbacks in the invisibility but when he became invisible, there came to his view thousands of disadvantages. Explain the statement in the general way when we have certain fantastic plans and the ensuing disappointment when we have realized them.

5. The entire course of Griffin’s life is that of wickedness, cruelty, rudeness and unscrupulous existence. However, at the end he ended with a tragic note. Explain the statement with Griffin’s chasing his ambition, getting deceived and finally leading to his catastrophic death.

6. Marvel is the only character in ‘The Invisible Man who interacts with Griffin and gains something. Comment. =======================================================================

INDIAN SCHOOL, AL AIN

HOLIDAY ASSIGNMENT

GRADE 12(Comp.Science)

THEORY( Write the answers in separate sheet & submit) 1)

(a) Write the type of C++ tokens (keywords and user defined identifiers) from the following :

(i) case (ii) _delete (iii) WHILE (iv) 21stName

(b)

Jayneel has just started learning C++. He typed the following C++ code and during the

compilation of the code, he got some errors. When Jayneel asked his teacher, the teacher told

him to include necessary header files in the code.

Write the names of those header files, which Jayneel needs to include, for successful

compilation and execution of the following code.

void main()

cout <<"We win ! !! !"<<endl;

cout <<strlen("The World")<<endl ;

(c)

Deepa has just started working as a programmer in STAR SOFTWARE company. In the company

she has got her first assignment to be done using a C++ function to find the smallest number out

of a given set of numbers stored in a one-dimensional array. But she has committed some

logical mistakes while writing the code and is not getting the desired result. Rewrite the correct

code underlining the corrections done. Do not add any additional statements in the corrected

code.

int find(int a[],int n)

int s=a[0];

for(int x=1;x<n;x++)

if(a[x]>s)

a[x]=s;

return(s);

(d) Find the output of the following program segment ( Assuming that all required header files

are included in the program

void main()

char Text[ ]=”TALenT@orG”;

for(int i=0;Text[i]!=’\0’;i++)

if(!isalpha(Text[i]))

Text[i]=’*’;

else if(!isupper(Text[i]))

Text[i]=Text[i]+1;

else Text[i]=Text[i+1];

cout<<Text ;

(e) Find the output of the following program :

#include <iostream.h>

void in(int x, int y, int &z)

x+=y;

y– –;

z*=(x–y);

void out(int z,int y, int &x)

x*=y;

y++;

z/=(x+y);

void main()

int a=20, b=30, c=10;

out(a,c,b);

cout<<a<<"#"<<b<<"#"<<c<<"#"<<endl;

in(b,c,a);

cout<<a<<"@"<<b<<"@"<<c<<"@"<<endl;

out(a,b,c);

cout<<a<<"$"<<b<<"$"<<c<<"$"<<endl;

(f)Observe the following program & Find out the correct possible outputs from the options .

( Assuming that all required header files are included in the program)

#include<iostream.h>

#include<stdlib.h>

void main()

const int M = 7;

char* days[M] = "Sun","Mon","Tue","Wed","Thu","Fri","Sat";

randomize(); int num = M - random(3);

for(int j=num-1; j<M; j++) cout<<days[j]<<endl;

Options: (i) Sat

(ii) Fri Sat

(iii) Thu Fri Sat

(iv) Wed Thu Fri Sat

(g)

.Find and write the output of the following C++ program code :

Note : Assume all required header files are already included in the program.

#define Big(A,B) (A>B)?A+1:B+2

void main()

char W[] = "Exam";

int L=strlen(W);

for(int i=0; i<L–1; i++)

W[i] = Big(W[i],W[i+1]);

cout<<W<<end1;

2)

a)Differentiate between private and public members of a class in context of Object

Oriented Programming. Also give a suitable example illustrating accessibility/nonaccessibility

of each using a class and an object in C++.

(b) Define a class CONTEST in C++ with the following description :

Private Data Members

Eventno integer

Description char(30)

Score integer

qualified char (Y/N)

Public Member functions

A constructor to assign initial values Eventno as 11, Description as ‘‘School level’’, Score as 100,

qualified as ‘N’.

Input() – To take the input for Eventno, description and score.

Award (int cutoffscore) – To assign qualified as ‘Y’, if score is more than the cutoffscore that is

passed as argument to the function, else assign qualified as ‘N’.

Displaydata() – to display all data members.

(c) Answer the questions (i) and (ii) after going through the following class :

class schoolbag

int pockets;

public:

schoolbag() //Function 1

pockets=30;

cout<<"The bag has pockets"<<end1;

void company() //Function 2

cout<<"The company of the Bag is ABC"<<end1;

schoolbag(int D) //Function 3

pockets=D;

cout<<"Now the Bag has pockets"<<pockets<<end1;

~schoolbag() //Function 4

cout<<"Thanks"<<end1;

;

(i) In Object Oriented Programming, what is Function 4 referred as and when does it get

invoked/called ?

(ii) In Object Oriented Programming, which concept is illustrated by Function 1 and Function 3

together ?

d) Answer the following questions (i) to (iv) based on the following code :

class DRUG

char catg[10];

char DOF[10], comp[20];

public:

DRUG( );

void endrug( );

void showdrug( );

;

class TABLET : public DRUG

protected:

char tname[30],volabel[20];

public:

TABLET( );

void entab( );

void showtab( );

;

class PAINKILLER : public DRUG

int dose, usedays;

char seffect[20];

public :

void entpain( );

void showpain( );

;

i) How many bytes will be required by an object of TABLET?

ii) Write names of all the member functions of class PAINKILLER.

iii) Which type of inheritance this is ?

iv) Name the member function accessible by object of PAINKILLER , when TABLET will

be derived publicly and DRUG protectedly ?

3)

(a) A binary file ‘‘games.dat’’ contains data of 10 games where each game’s data is an object

of the following class :

class game

int gameno;

char game_name[20];

public:

void enterdetails()cin>>gameno; gets(game_name);

Void enterdetails () cout<<gameno<<endl<<game_name ;

;

With reference to this information, write C++ statement in the blank given below to move the file

pointer to the end of file.

If stream file;

Game G;

ifile.open("games.dat",ios::binary|ios::in);

___________________________________

cout<<ifile.tellg();

(b) Aditi has used a text editing software to type some text. After saving the article as

WORDS.TXT, she realised that she has wrongly typed alphabet J in place of

alphabet I everywhere in the article. Write a function definition for JTOI()in C++ that would

display the corrected version of entire content of the file WORDS.TXT with all the alphabets “J” to

be displayed as an alphabet “I” on screen.

Note : Assuming that WORD.TXT does not contain any J alphabet otherwise.

Example :

If Aditi has stored the following content in the file WORDS.TXT :

WELL, THJS JS A WORD BY JTSELF. YOU COULD STRETCH

THJS TO BE A SENTENCE

The function JTOI( ) should display the following content :

WELL, THIS IS A WORD BY ITSELF. YOU COULD STRETCH

THIS TO BE A SENTENCE

(c)

Write a definition for function COUNTDEPT( ) in C++ to read each object of a

binary file TEACHERS.DAT, find and display the total number of teachers in the

department MATHS. Assume that the file TEACHERS.DAT is created with the

help of objects of class TEACHERS, which is defined below :

class TEACHERS

int TID; char DEPT[20];

public:

void GET()

cin>>TID;gets(DEPT);

void SHOW()

cout<<TID<<":"<<DEPT<<end1;

char *RDEPT()return DEPT;

;

4)

a)

T[25][30] is a two dimensional array, which is stored in the memory along the

row with each of its element occupying 2 bytes, find the address of the element

T[10] [15], if the element T[5] [10] is stored at the memory location 25000.

b)

Write the definition of function named Array_Swap() that will accept an integer array & its

size as arguments and the function will interchange/swap elements in such a way that the

first element is swapped with the last element, second element is swapped with the

second last element and son on, only if anyone or both the elements are odd.

E.g. if initially array of seven elements is:

5, 16, 4, 7, 19, 8, 2

After execution of the above function, the contents of the array will be:

2,16, 19, 7, 4, 8, 5

c)

Write the definition of a user-defined function REPEAT_ROW(int A[][3],int R, int C) in C++ that

will store the elements in the following manner

1. All row elements except the 1st element replaced by the 1st element,

2. All row elements except the 1st & 2nd element replaced by the 2nd element,

3. All row elements except the 1st , 2nd & 3rd element replaced by the 3rd element and so

on

5 5 5 5

2 6 6 6

18 14 5 5

d) Write the definition of a member function PUSHBOOK( ) in C++ to add

information of BOOK in a static stack implemented using an array of structure

BOOK (definition of struct BOOK is defined below for reference).

struct BOOK

int BNO;

char TITLE[20];

;

e)

Evaluate the following POSTFIX expression. Show the status of Stack after execution of each

operation separately:

i) TRUE, FALSE, OR, NOT, TRUE, FALSE, AND, OR

ii) 50,40,-,4,5,*,+

f) Write the definition of a member function ADDMEM( ) for a class QUEUE in C++, to add a

MEMBER in a dynamically allocated Queue of Members

considering the following code is already written as a part of the program.

struct Member

int MNO;

char MNAME[20];

Member *Next;

;

Class QUEUE

Member *Rear,*Front;

public:

QUEUE()Rear=NULL; Front=NULL;

void ADDMEM();

void REMOVEMEM();

~QUEUE();

;

Project Work The project has to be developed in C++ language with Object Oriented Technology and also should have use of Data files.

Practicals Complete all algorithms & submit along with the program.

PSYCHOLOGY

CASE-STUDY Make a case study report on any psychological disorder you studied including Introduction, Identification of Data, Case history (including family history, information on physical health, any professional health taker, brief history of the problem, attitude towards counseling, recording signs and symptoms, treatment and outcome and conclusion.)

A. Study and write the answers to the following questions: (in A4 size Paper and file them)

Very short Answers: (2 marks)

1. What do you understand by Type-C personality? 2. Explain the Behavioural effects of stress. 3. What is substance dependence? 4. Explain Separation Anxiety Disorder. 5. How are IQ distributed in a population? 6. State 2 psychological disorders in which cognitive behaviour therapy 7. State four characteristics of psychotherapeutic approaches. 8. How does humanistic-existential model explain psychological disorders?

Short Answer Type-1: (3 marks) 9. Explain the interactional approach to understand personality. 10. Explain the relationship between creativity and intelligence. 11. State the term withdrawal and tolerance in substance use disorder. 12. Differentiate technological and integral intelligence.

Short Answer Type-II: (4marks) 13. Explain the competences of Indian notion of intelligence. 14. How do Alfred Adler and Karen Horney explain personality development? 15. Explain the technique of behavioural analysis used in personality assessment. 16. Which disorder is the cause of distorted body image? Explain its various forms. 17. What are Somatoform disorders? Explain in detail. 18. Explain with examples how cognitive distortions take place.

19. Explain emotional intelligence. State any two characteristics of emotionally intelligent persons.

20. Describe the key features of self-report measures used in personality assessment. 21. Explain briefly four factors which facilitate development of positive health. 22. Explain mental disorders from cognitive perspective. 23. Discuss the main propositions of humanistic approach to personality.

Long Answer: (6marks)-Answer all the questions:

24. Which therapy encourages the client to seek personal growth and actualize their potential? Write about the therapies which are based on this principle.

25. Describe the various steps involved in conducting a scientific enquiry.

26. Explain how the different types of projective techniques help in personality assessment.

27. Explain how would a social learning theorist and a psychoanalyst account for phobia of lizards. Support your answer with examples.

28. Explain the importance of therapeutic relationship in psychotherapy. State the ethical standards in psychotherapy

29. Explain the nature of stress giving examples. Discuss avoidance oriented coping strategy.

30. Distinguish between Eustress and Distress giving suitable examples. Discuss the different sources of psychological stress.

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