Summer Holiday Homework 2018

Class 9th

Subject Hindi 1- |

2- |

3- 250 300 |

4- 250 300 |

5- | ( , , , , , - , , , ) |

Subject English

Class 9 A B

STORY WRITING-2

ARTICLE WRITING-2

PARAGRAPH WRITING-2

DIARY ENTRY-2

LETTER WRITING-2

REPORT WRITING-2

READING LESSONS AND POEMS

READING NEWS PAPERS DAILY

Project file- 1 POETS AND AUTHORS

CLASS- IX C

SUB- ENGLISH

- Write down the names of all the authors & poets of the given prose & poetry in your Notebook.

- Any two pictorial stories with a suitable title & moral. (A4 size paper-file)

- A Movie Review. (A4 size paper-file)

- Read, Learn & write down the short summary of the given poems in your notebook. (80-100 words)

# Wind

# Rain on the Roof

# On Killing a Tree

Subject maths

Class 9 A,B

EX. 1.1 Q. 3, 4

EX. 1. 2 Q. 3

EX. 1.3 Q. 2, 4, 7

EX. 1.4 Q. 1

EX. 1.5 Q. 2 (i), (iii) Q.5 (ii), (iv)

EX. 1.6 Q. 2, 3

___________________________________________

EX. 2.1 Q. 4, 5

EX. 2.2 Q. 3 (iii), (iv), (vi), (viii)

4 (ii), (iv), (v), (vii)

EX. 2.3 Q. 2, 3

EX. 2.4 Q. 2, 4

EX. 2.5 Q. 5(i), Q. 6(iii), Q. 8 (iii), (v)

Q, 11, 13

Class ix- c

project -

1} Square root Spiral up to 10

2} history of prominent mathematicians

{at least 5 }

Practice questions

{Q1} simplify the following

{i} [43-22][32+4

{ii}[2+3][3+5]

{iii}[3+2]

{Q2} rationalise the denominator of the following

{i} 2/3-5

{ii}6/5+2

{iii}1/5+32

{q3} if a and b are rational numberS and 4+35/4-35= a+b5, find the values of

a and b

{q4}repreSent the real numberS 13 on the number line .

{q5} find two rational numberS and irrational numberS between 2 and 3.

{q6} visualise 4.625 on the number line using successive magnification .

[q7} express 0.6 +0. 7+ 0.47in the form of p/q .

{q8} factorise

{i} 6x+17x+5

{ii} y-5y+6

{iii}x+9x+18

{Iv}2x-7x-15

Subject Science

Class IX (A+B+C) Subject: Physics

(A) NCERT examples from 1 to 7 of chapter Motion.

(B) NCERT page no 102 question no 1 to 5.

(C) NCERT page no 103 question no 1 to 3.

IX A B C CHEMISTRY

1. Arrange the following in the order of increasing density- air , exhausts from chimneys honey

water chalk cotton and iron?

2. Tabulate the differences in the characteristics of states of matter?

3. Give reasons; (a) a gas fills completely the vessel in which it is kept (b) a wooden table

should be called a solid

4. Define melting point?

5. Why does a desert cooler cool better on a hot dry day?

6. How does the water kept in a earthen pot become cool during summer?

7. Why are we able to sip hot tea or milk faster in a saucer rather in a cup?

8. What type of clothes should we wear in summer?

9. Convert the following temperature in Celsius scale . (a) 300 K (b) 573 K

10. What is the physical state of water at 250o C ?

11. Suggest a method to liquefy atmospheric gases .?

12. Important points: Page 11: What you have learnt.

SUBJECt Biology

1. Write difference between xylem and Phloem.

2. Draw labeled diagram of phloem.

3. Difference between striated and unstraited muscles.

4. Define macro and micro nutrient with example.

5. Define mixed cropping and intercropping.

Subject Social Science

HISTORY:- Mark the following places

i) Italy

ii) Germany

iii) Spain

iv) England

v) USA

vi) France

GEOGRAPHY:-Chapter 2 fig 2.1 (plate boundaries)

ECONOMICS & CIVICS:- 1. Adopt a heritage India scheme

2. Atal new India challenge

Subject Sanskrit

Class 10th

Subject Hindi

-1 , |

-2 |

-3 |

-4 ( ) |

-5 |

-6 |

-7 |

Subject English

CLASS- X A & C

SUB- ENGLISH

1. Write down the names of the poets, the authors & the dramatists of the given poems, fictions &

dramas in your English Notebook.

2. Write down the central idea of the given poems in your notebook. (60-80 words)

The Frog & the Nightingale

Not Marble, nor the Gilded Monuments

Ozymandias

snake

Class XB

THE STORY OF MY LIFE- 2 QUESTIONS AND ANSWERS LESSONS 1- 15

STORY WRITING-2

ARTICLE WRITING-2

PARAGRAPH WRITING-2

DIARY ENTRY-2

LETTER WRITING-2

REPORT WRITING-2

READING LESSONS AND POEMS

READING NEWS PAPERS DAILY

Project file- 1 HEALTH AND MEDICINE , SCIENCE, SPORTS AND GAMES, EDUCATION

Subject maths

{q1} activity to verify the conditions for consistency/inconsistency for

a pair of linear equation in two variables by graphical method.

{Q2} show that the squares of an odd positive integer is of the form 8m+1

, for same whole number m .

{q3} uSe euclidS diviSion lemma to find the hcf o 441, 567, 693.

{q4} show that 12n can not end with the digit 0 or 5 for any natural

number n.

{q5} if lcm (480,672)=3360, find hcf (480,672)

{q6} explain why 3x5x7+7 is a composite number.

{q7} prove that 7 iS an irrational number .

{q8} prove that 2+35 iS an irrational number.

{q9} find all the quadratic polynomial whoSe zeroeS are 2+3 and 2-3.

{q10} find all the zeroes of the polynomial 4+x-34x-4x+120 if two of

its zeroes are 2 and -2.

{q11} if one of quadratic polynomial x+3x+k is 2 then find the values of

k

{q12} solve each of the following system of linear equation graphically

{i} x+2y =3; 4x+3y=2

{ii} 2x+3y=4; 3x-y=-5

{iii} 3x+1=o ; 2x-3y+8=0

Subject Science

CHEMISTRY: CHEMICAL EQUATIONS & REACTIONS 1. Write the balanced chemical equations for the following reactions

(a) Sodium carbonate on reaction with hydrochloric acid in equal molar

concentrations

gives sodium chloride and sodium hydrogencarbonate.

(b) Sodium hydrogencarbonate on reaction with hydrochloric acid gives

sodium

chloride, water and liberates carbon dioxide.

2. A solution of potassium chloride when mixed with silver nitrate solution,

an insoluble

white substance is formed. Write the chemical reaction involved and also

mention the

type of the chemical reaction?

3. Ferrous sulphate decomposes with the evolution of a gas having a

characteristic

odour of burning sulphur. Write the chemical reaction involved and identify

the type of

reaction.

4. Balance the following chemical equations and identify the type of

chemical reaction.

(a) Mg(s) + Cl2(g) MgCl2(s)

(b) HgO(s) Hg(l) + O2(g)

(c) Na(s) + S(s)Na2S(s)

(d) CaO(s) + SiO2(s)CaSiO3(s)

(e) H2O2(l)H2O(l) + O2(g)

5. A magnesium ribbon is burnt in oxygen to give a white compound X

accompanied by

emission of light.

(a) Write the chemical formulae of X .

(b) Write a balanced chemical equation, when X is dissolved in water.

6. Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid,

whereas

copper does not. Explain why?

7. A silver article generally turns black when kept in the open for a few

days. The

article when rubbed with toothpaste again starts shining.

(a) Why do silver articles turn black when kept in the open for a few days?

Name the

phenomenon involved.

(b) Name the black substance formed and give its chemical formula.

8. What happens when a piece of

(a) zinc metal is added to copper sulphate solution?

(b) aluminium metal is added to dilute hydrochloric acid? (c) silver metal is

added to

copper sulphate solution? Also, write the balanced chemical equation if the

reaction

occurs

9. On adding a drop of barium chloride solution to an aqueous solution of

sodium

sulphite, white precipitate is obtained.

(a) Write a balanced chemical equation of the reaction involved

(b) What other name can be given to this precipitation reaction?

Subject bio

1.What are the advantage of sexual reproduction over asexual reproduction?

2.Write the difference between regeneration and fragmentation.

3.Explain the function of following part of female reproductive system.

i)Ovary ii)fallopian tube iii)uterus

4.What are the contraceptive method ?explain.

5.Draw label diagram of nerve cell?

Subject Physics

Subject Social Science

HISTORY:- MARK THE FOLLOWING PLACES

i) Italy

ii) Germany

iii) Spain

iv) England

v) Usa

vi) France

Geography:- chapter1 fig 1.2 (classification of resources)

ECONOMICS & CIVICS :-

Adopt a heritage India scheme

Atal new India challenge

Subject Sanskrit

Class XII

Subject English

Q.1. Read the novel THE INVISIBLE MAN completely and write the summary of the first 14chapters in

your notebook.

Q.2. Solve one board sample paper/latest board sample paper excluding the literature section.

Q.3.Write all the hard word along with their meanings from all the chapters of Flamingo.

Q.4.Do as directed

(a) Two articles of your choice

(b)Any two speech based on contemporary problem.

(c)Any one complaining letter and one order placement letter.

(d)Two advertisement.

(e) Two notice of organizing any event.

Subject Chemistry

XII B

1. Note making of chapter General Principles and processes of isolation of

elements.

2. Note making of chapter Polymers.

3. Note making of chapter Chemistry in everyday life.

4. Writing Q & A of AISSCE Question paper of the 2016, 2017 and 2018

papers of the chapters 1,2,6,15.16 .

5. Completion of investigatory project .

Subject: Physics

Name of subject Teacher: Ajay Kumar Agarwal

(A) Write and prove Gausss theorem and find out an expression

for electric field due to infinitely long plane sheet of charge having

uniform surface charge density.

(B) Draw circuit diagram for

(i) Experimental verification of Ohms law.

(ii) Measurement of unknown resistance by Meter Bridge.

(iii) Comparison of emf of two primary cells.

(iv) Measurement of internal resistance of a cell using

potentiometer.

(C) NCERT question no 15 to 24 of chapter 1.

(D) NCERT question no 25 to 33 of chapter 2.

(E) NCERT question no 11 to 24 of chapter 3.

(F) Solution of previous year CBSE questions (All India Set) of

Unit I and II (2014, 2015, 2016, 2017, 2018).

Class XII (Computer Science)

Computer Science Holidays Homework 2018-19

1) A case study of Procedural Programming and Object Oriented Programming

2) Similarities and differences between a structure and a class

3) Explain different modifiers in a class.

4) Make a detail notes on Tokens in C++

5) Make a list of Header files and their functions. Give example of each in C++

6) Write a project using class and functions using the knowledge gained in Class XI computer

Science.

Assignment

Chapter: C++ revision tour

Very short/short answer question

Chapter: Class and object:

Unsolved Problem:

Long answer question:

Assignment

Chapter: Object oriented programming

Very short/short answer question

Chapter: Class and object:

Unsolved Problem:

Long answer question:

Assignment

Chapter : Constructor and Destructor

Very short/short answer question

Chapter: Class and object:

Unsolved Problem:

Long answer question:

Project

(Any one project in a group of 2 or alone)

1. Library Management System

2. Banking System

3. Hospital Management System

4. Railway Reservation System

5. Inventory control program

6. Examination System

7. Quiz

8. Game

9. Hotel Management

10. Any subsystem of a System Software or Tool

11. Any Scientific or a fairly complex algorithmic situation

12. Transport query system

13. Tutor, Computer Aided Learning Systems

( Or any other domains on the similar lines

Class XII (IP)

1. Make a labeled picture/diagram of Netbeans IDE in Java. Also mention the various

components of Netbeans IDE.

2. Give any two examples for the following categories of software:

A. Open Source software

B. Freeware

C. Free software

D. Proprietary software

E. Shareware

3. Write any 10(Ten) programs in Java using Loops and Selection controls in assignment file.

Project

(Any one project in a group of 2 or alone)

1. Library Management System

2. Banking System

3. Hospital Management System

4. Railway Reservation System

5. Inventory control program

6. Examination System

7. Quiz

8. Game

9. Hotel Management

10. Any subsystem of a System Software or Tool

11. Any Scientific or a fairly complex algorithmic situation

12. Transport query system

13. Tutor, Computer Aided Learning Systems

( Or any other domains on the similar lines)

Subject Bio

Class XII B

-Draw any 12 diagrams from the completed chapters .

-Solve one marks questions taking ten questions from each completed chapter.

- Solve two mark questions taking five questions from each completed chapter

- Solve three mark questions taking three questions from each completed chapter

- Solve five mark questions taking three questions from each completed chapter

-Completion of investigatory project assigned and discussed to all students .

-Draw any one important diagram on chart paper .

HOLIDAY HOMEWORK CLASS 12TH A, B, C MATHEMATICS

1. If and are equivalence relations in a set A, show that is also an

equivalence relation.

2. Show that the function : { : < < } defined by () =

+ || ,

is one- one and onto function

3. Let : be defined as () = , if is odd and() = + , if is even.

Show that is invertible. Find the inverse of . Here, is the set of whole

numbers.

4. : is defined by () = + , (()).

5. Show that the relation R in the set { : },given by

= {(, ): | | is a multiple of } is an equivalence relation. Also find the set of

all elements related to 1.

6. Let : be a function defined by () = + + .Show that :

is iinvertible, where is the range of . Hence find .

7. Consider : + [,] given by () = + .Show that is invertible .

Hence find .

8. Given a non- empty set X, consider the binary operation on () given by

= , (), where ()is the powewr set of .Show that is the

identity element and is the only invrtible element in () with with respect to

operation .

9. Let R be a relation on the set A = , where N is the set of natural numbers,

defined by (, ) (, ) if and only if = . Show that R is an equivalence

relation.

10. Show that the relation R in the set , defined by (, ) (, ) iff +

= + , , , , is an equivalence relation.

11. On the set {, , , , , , }, a binary operation is defined as :

= { + , + < + , +

Write the operation table of the operation and prove that zero is the identity for

this operation and each element of the set is invertible with being the

inverse of .

12. Write the principal value of :- 4 (1) + (

) .

13. Write the value of :- tan ( 2

) .

14. Evaluate: ( (

)) .

15.

+

+

= .

16. Solve for : ( ) =

.

17. Prove that : (

) (

) = ; | | a.

(c) If this dipole were kept in a uniform external electric field E0, diagrammatically represent the position of the dipole in

stable and unstable equilibrium and write the expressions for the torque acting on the dipole in both the cases.

Q. Use GAUSSS theorem to find he electric field due to a uniformly charged infinitely large plane thin sheet with surface charge density .

(a) An infinitely large thin plane sheet has a uniform surface charge density +. Obtain the expression for the amount of work

done in bringing a point charge q from infinity to a point , distant r, in front of the charged plane sheet.

Q. Two identical parallel plate capacitors A&B are connected to a battery of V volts with the switch S closed. The switch is now opened & the free space between the plates of the capacitors is filled with a dielectric of dielectric constant K. Find the ratio of the total electrostatic energy stored in both capacitors before & after the introduction of the dielectric.

CBSE 2016:

1.What is the amount of work done in moving a point charge Q around a circular arc of radius r at the

centre of which another point charge q is located

2. Find the electric field intensity due to a uniformly charged spherical shell at a point (i) outside the shell

and (ii) inside the shell . Plot the graph of electric field with distance from the centre of the shell

3. (a) Distinguish , with the help of a suitable diagram , the difference in the behaviour of a conductor and a dielectric placed in an external electric field. How does polarised dielectric modify the original external field ?

(b) a capacitor of capacitance C is charged fully by connecting it to a battery of emf E . It is then disconnected from the battery . If the separation between the plates of the capacitor is now doubled , how will the following change ?

(i) Charge stored by the capacitor (ii) Field strength between the plates.

(iii) Energy stored by the capacitor justify your answer in each case.

Q. (a) Explain why , for any charge configuration , the equipotential surface through a point is normal to the

electric field at that point. Draw a sketch of equipotential surfaces due to a single charge (-q) depicting

the electric field lines due to the charge.

(b) Obtain an expression for the work done to dissociate the system of three charges placed at the vertices

of an equilateral triangle of side a as shown below.

q

-4q 2q

CBSE 2015:

1. Define dielectric constant of a medium. What is its S.I. unit?

2 .Three circuits , each consisting of a switch S and two capacitors, are initially charged , as shown in

the figure . after the switch has been closed , in which circuit will the charge on the left-hand

capacitor (a) increases ,(b) decreases and (c) remain same ? Give reasons .

3.(a) Sate Gausss law in electrostatics. Show with the help of a suitable example along with the figure ,

that the outward flux due to a point charge q in vacuum within a closed surface, is independent of

its size or shape and is given by Q / 0.

(b) Two parallel uniformly charged infinite plane sheets , 1 and 2 , have charge densities + and -2

respectively . Give the magnitude and direction of the net electric field at a point

(i) in between the two sheets and (ii) outside near the sheet 1.

OR

(a) Define electrostatic potential at a point . Write its S.I unit

Three point charge q1, q2,q3 are kept respectively at point A,B, and C as shown in the figure.

Derive the expression for the electrostatic potential energy of the system .

(b) Depict the equipotential surface due to

(i)an electric dipole, (ii)Two identical positive charges separated by a distance.

CBSE 2014:

1. Why do electrostatic field lines not form closed loops ?

3. ( a) Deduce the expression for the torque acting on a dipole of dipole moment p in the presence of a

Uniform electric field E.

(b) Consider two hallow concentric spheres, S1 and S2, charges 2Q and 4Q respectively as shown in

the figure. (i) Find out the ratio of electric flux between them.

(ii) How will the electric flux through the sphere S1 if a medium of dielectric constant r is

introduced in the space inside S1 in place of air ?Deduce the necessary expression.

S2

S1 2

S2

3. A parallel plate capacitor of capacitance C is charged to a potential V.It is then connected to another

charged capacitor having the same capacitance. Find out the ratio of the energy stored in the

combined system to that stored initially in the single capacitor.

CBSE 2013:

1. Two charges of magnitude -3Q and +2Q are located at points (a,0) and (4a,0) respectively. What is the electric flux due to

these charges through a sphere of radius 5a with its centre at the origin?

2. A slab of material of dielectric constant K has the same area as that of the plates of a parallel plate capacitor but has the

thickness d/3,where d is the separation between the plates .Find out th expression for its capacitance when the slab is inserted

between the plates of the capacitors.(SET 2)

3. A capacitor made of two parallel plates each of plate area A and separation d, is being charged by an external ac source.

Show that the displacement current inside the capacitor is the same as the current charging the capacitor.

4.(a) Define electric dipole moment. Is it a scalar or a vector? Derive the expression for the electric field

of a dipole at a point on the equatorial plane of the dipole.

(b) Draw the equipotential surfaces due to an electric dipole. Locate the points where the potential due to the dipole is zero

5. Using the Gauss Law deduce the expression for the electric field due to a uniformly charged spherical

conducting shell of the radius R at a point(i)outside and (ii)inside the shell.

Plot a graph showing variation of electric field as a function of r>R and r

5. A charge q is placed at the centre of a cube of side l. What is the electric flux passing through two opposite faces of the cube? [1

6. A test charge q is moved without acceleration from A to C along the path from A to B and then from B to C in electric field E as shown in the figure, [2

(i) Calculate the potential difference between A and C.

(ii) At which point (of the two) is the electric potential more and why?

7. A charge 'q' is placed at the centre of a cube. What is the electric flux passing through the cube? 1

8. A test charge 'q' is moved without acceleration from A to C along the path from A to B and then. from B to C in electric field E as shown in the figure,

(i) Calculate the potential difference between A and C.

(ii) At which point (of the two) is the electric potential more and why?

CBSE 2011:

1. Define electric dipole moment. Write its S.I. unit. [1

2. A hollow metal sphere of radius 5 cm is charged such that the potential on its surface is 10 V. What is the potential at the centre of the sphere? [1

3. A thin straight infinitely long conducting wire having charge density X is enclosed by a cylindrical surface of radius r and length I , its axis coinciding with the length of the wire. Find the expression for the electric flux through the surface of the cylinder. [2

4 . Plot a graph showing the variation of Coulomb force (F) versus where r is the distance between the two charges of each pair of charges: (1 C, 2 C) and (2 C, - 3 C). Interpret the graphs obtained. [2

5. Net capacitance of three identical capacitors in series is 1 F. What will be their net capacitance if connected in parallel? Find the ratio of energy stored in the two configurations if they are both connected to the same source. [2

6. A hollow metal sphere of radius 10 cm is charged such that the potential on its surface is 5 V. What is the potential at the centre of the sphere? [1

7. Net capacitance of three identical capacitors in series is 2 F. What will be their net capacitance if connected in parallel? Find the ratio of energy stored in the two configurations if they are both connected to the same source. [2

8. Plot a graph showing the variation of Coulomb force (F) versus where r is the distance between the two charges

of each pair of charges: (1 C, 2 C) and (2 C, 3 C). Interpret the graphs obtained. [2

9. A hollow metal sphere of radius 6 cm is charged such that the potential on its surface is 12 V. What is the potential at the centre of the sphere? [1

10. Net capacitance of three identical capacitors in series is 3 F. What will be their net capacitance if connected in parallel? Find the ratio of energy stored in the two configurations if they are both connected to the same source. [2

CBSE 2010:

2

1

r

1. Name the physical quantity whose S.I. unit is J C 1. Is it a scalar or a vector quantity? [1

2. A spherical conducting shell of inner radius r1 and outer radius r2 has a charge Q. A charge q is placed at the centre of the shell. [2

(a) What is the surface charge density on the (i) inner surface, (ii) outer surface of the shell?

(b) Write the expression for the electric field at a point x > r2 from the centre of the shell.

3. Show that the electric field at the surface of a charged conductor is given by , where is the surface charge density

and is a unit vector normal to the surface in outward direction. [2

4. A network of four capacitors each of 12 F capacitance is connected to a 500 V supply as shown in the figure. Determine (a) equivalent capacitance of the network and (b) charge on each capacitor. [3

CBSE 2009:

1. What is electrostatic potential due to electric dipole at an equatorial point? [1

2. Draw 3 equipotential surfaces corresponding to a field that uniformly increases in magnitude but remains constant along Z direction. How are these surfaces different from that of a constant electric field along Z- direction. [2

3. Define Electric flux. Writ its S.I. unit. A charge q is enclosed by a spherical surface of radius R. If the radius is reduced to half, how would the electric flux through the surface change? [2

4. A +q point charge is kept in the vicinity of an uncharged conducting plate. Sketch electric field lines originating from the point on the surface of the plate. Derive the expression for the electric field at the surface of a charged conductor.[3 A parallel plate capacitor is charged by a battery. After some time battery is disconnected and dielectric slab (K) is inserted between the plates. How would (i) capacitance (ii) electric field (iii) energy stored be affected? Justify your answer.

CBSE 2008:

1. Which orientation of an electric dipole in a uniform electric field would correspond to stable equilibrium? [1

2. If the radius of Gaussian surface enclosing a charge is halved, how does the electric flux through the Gaussian surface change? [1

3. Define the term electric dipole moment of a dipole. State its S.I. unit. [1

4. Two point charges 10 10 8C and 2 10 8C are separated by a distance of 60cm in air. (i)Find at what distance from first charge, the electric potential is zero. (ii) Also calculate the electrostatic potential energy of the system. [2

5. Two point charges 4Q and Q are separated by 1m in air. At what point on the line joining the two charges is the electric field intensity is zero? Also calculate the electrostatic potential energy of the system of charges, taking the value of charge, Q= 2 10 7C.

6. Derive an expression for the energy stored in a parallel plate capacitor. On charging a parallel plate capacitor to potential V, the spacing between the plates is halved, and a dielectric medium of K=10 is introduced between the plates, without disconnecting the d.c source. Explain using suitable expressions, how the (i) capacitance,(ii)electric field and (ii) energy density of the capacitor change

7. (a) Define electric flux. Write its S.I. units. The electric field components due to a charge inside the cube of side 0.1m are as shown:

o

E n

n

Ex= ax , where a=500N/C-m Ey =0 , Ez= 0 Calculate (i) the flux through the cube, and (ii) the charge inside the cube

CBSE 2007:

1. Two point charges 4C and -2C are separated by a distance of 1m in air. Calculate at what point on the line joining the two charges is the electric potential zero. [2

2. State Gausss theorem. Apply this theorem to derive an expression for the electric field intensity at a point near an infinitely long, thin uniformly charged straight wire. / (set II uniformly charged spherical shell.) [3

3. Explain the underlying principle of working of a parallel plate capacitor. If two similar plates, each of area A having surface charge densities + and - are separated by a distance d in air, write expressions for i) electric field at points between the plates. ii) potential difference between the plates iii) capacitance of capacitor so formed. [3

CBSE 2006:

1. Define electric dipole moment. Is it a scalar or a vector quantity? [1

2. A point charge q is placed at O as shown in the figure. Is VP VQ positive or negative when

(i) q >0 ,(ii) q< 0? O _______P____Q Justify your answer. [2

3. Two capacitors of capacitance 6F and 12F are connected in series with a battery. The voltage across the 6F is 2 V Compute the total battery voltage. [2

4. A parallel plate capacitor with air between the plates has a capacitance of 8F.The separation `between the plates is now reduced by half and the space is filled with K=5. Calculate the value of capacitance in the second case.

5. Using Gausss theorem, show mathematically that for any point outside the shell, the field due to a uniformly charged thin shell is the same as if the entire charge of the shell is concentrated at the centre. Why do you expect the electric field inside the shell to be zero according to this theorem?3

CBSE 2005:

1. (set I)An electrostatic field line cannot be discontinuous. Why? [1 2. (set II) How does the coulomb force between two charges depend on intervening medium?[1 3. (set III) Two electric lines never intersect each other. Why? [1

4. Define Electric field intensity. Write its SI unit. Write the magnitude and direction of E due to dipole of length 2a at the midpoint of line joining two charges. [2

5. (set I) A parallel plate capacitor is to be designed with voltage rating 1kV using a material of K=3 and dielectric strength 107 V/m. For safety we would like the field never to exceed say, 10% of the dipole strength. What minimum area of the plates is required to have a capacitance of 50 Pf [2

6. (set II) A charge q is placed at the centre of line joining two equal charges Q. Show that the system of three charges will be in equilibrium if q = -Q/4. [2

7. (set III) Two fixed charges +4e and +e are separated by a distance a. Where should the third point charge be placed for it to be in equilibrium? [2

8. A 4F capacitor is charged by a 200V supply. The supply is then disconnected and the charged capacitor is connected to another uncharged 2F capacitor. How much electrostatic energy of the first capacitor is lost in the process of attaining the steady situation?

9. State Gauss theorem. Apply this theorem to obtain the expression for the electric field intensity at a point due to infinitely long, thin, uniformly charged straight wire. [3

CBSE 2004:

10. An electric dipole of length 4cm, when placed with its axis making an angle of 60o with uniform electric field experiences a torque of 4 /3Nm. Calculate the (i) magnitude of electric field, (ii)the potential energy of dipole ,if the dipole has charges of +8nC. [2

11. A 10F capacitor is charged by a 30V d.c. and then connected across an uncharged 50F capacitor. Calculate (i) the final potential difference of the combination, and (ii) the initial and final energies. How will you account for the

difference in energy? [3 12. (set I, II) State Gauss theorem. Using this theorem to obtain the expression for the electric field intensity due to

infinite plane sheet of charge of charge density C /m2. [3

13. (set I, II) State Gauss theorem. Use this theorem to obtain the expression for the E at any point outside a uniformly charged spherical shell. [3

HOLIDAY HOMEWORK CLASS : 10 CHEMISTRY: CHEMICAL EQUATIONS & REACTIONS

1. Write the balanced chemical equations for the following reactions (a) Sodium carbonate on reaction with hydrochloric acid in equal molar concentrations gives sodium chloride and sodium hydrogencarbonate. (b) Sodium hydrogencarbonate on reaction with hydrochloric acid gives sodium chloride, water and liberates carbon dioxide. 2. A solution of potassium chloride when mixed with silver nitrate solution, an insoluble white substance is formed. Write the chemical reaction involved and also mention the type of the chemical reaction? 3. Ferrous sulphate decomposes with the evolution of a gas having a characteristic odour of burning sulphur. Write the chemical reaction involved and identify the type of reaction. 4. Balance the following chemical equations and identify the type of chemical reaction.

(a) Mg(s) + Cl2(g) MgCl2(s)

(b) HgO(s) Hg(l) + O2(g)

(c) Na(s) + S(s) Na2S(s)

(d) CaO(s) + SiO2(s)CaSiO3(s)

(e) H2O2(l)H2O(l) + O2(g) 5. A magnesium ribbon is burnt in oxygen to give a white compound X accompanied by emission of light. (a) Write the chemical formulae of X . (b) Write a balanced chemical equation, when X is dissolved in water. 6. Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not. Explain why? 7. A silver article generally turns black when kept in the open for a few days. The article when rubbed with toothpaste again starts shining. (a) Why do silver articles turn black when kept in the open for a few days? Name the phenomenon involved. (b) Name the black substance formed and give its chemical formula. 8. What happens when a piece of (a) zinc metal is added to copper sulphate solution? (b) aluminium metal is added to dilute hydrochloric acid? (c) silver metal is added to copper sulphate solution? Also, write the balanced chemical equation if the reaction occurs 9. On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained. (a) Write a balanced chemical equation of the reaction involved (b) What other name can be given to this precipitation reaction?

SET 1 TEST: THE SOLID STATE M.M. : 25

Q1. An ionic compound has a unit cell consisting of A ions at the corners of the cube and B ions on the centre of

the faces of cube. what is the empirical formula of the compound.

Q2 How many number of atoms present in fcc unit cell.

Q3. In a face centred cubic lattice a unit cell is shared equally by how many unit cell?

Q4. Which type of the crystal system of a compound with unit cell dimensions a=0.387, b=0.387and c=0.504nm

and = = 900 and =1200. Q5. When molten zinc is cooled to solid state, it assumes HCP structure. Then what will be the number of nearest

neighbour of zinc atom.

Q6 A compound is formed by element A and B. This crystallize in the cubic structure where the A atoms are at

corners of the cube and B atoms are at the body centres. then what is the simplest formula of the compound.

Q7. A solid has a structure in which W atoms are located at the corners of the cube lattice, O atoms at the centre

of the edge and Na atom at the centre of cube.what is the formula of the compound.

Q8. In a compound, oxide have HCP arrangement and the cations M occupy two-third octahedral voids. what is

the formula of compd.

Q9. In a solid, oxide ions are arranged in ccp. The cations A occupy one sixth of the tetrahedral voids and cations

and B occupy one third of the octahedral voids. What is the formula of the compound.

Q10. Metallic gold crystallizes in the face centred cubic lattice .What is the approximate number of unit cells in

2.0g of gold? atomic mass of gold is 197.

Q11. Name of the crystal class for which all the four types of unit cells are possible.

Q12. If Z is the number of atoms in the unit cell that represents the closest packing sequence...abc abc ... then

How many number of tetrahedral voids are present in the unit cell?

Q13. Analysis shows that a metal oxide has the empirical formula M 0.96 O1.00 . Calculate the percentage of M2+

and M3+

ions in this crystal?

Q14. In an ionic compound the aionic(N)form cubic close type of packing. While the cation (M+)ions occupy one

third of the tetrahedral voids. Deduce the empirical formula of the compound and the coordination number

of (M+)ions.

Q15. Name the type of point defect that occurs in a crystal of zinc oxide.

Q16. how many octahedral voids are there in 1mole of a compound having cubic close packed structure?

Q17. An element E crystallizes in body centred cubic structure. If the edge length of the cell is 1.469 10-10

m

and the density is 19.3gcm-3

, Calculate the atomic mass of this element . Also calculate the radius of an

atom of this element.

Q18. A compound contains two types of atoms-X and Y. It crytallises in a cubic lattice with atom X at the

corners of the unit cell and atoms Y at the body centres. What is the simplest possible formula of this

compound?

Q19. An element X with an atomic mass of 60g/mol has density of 6.23g cm-3

. If the edge length of its cubic unit

cell is 400pm, identify the type of cubic unit cell. Calculate the radius of an atom of this element.

SET 2 TEST PAPER: SOLUTIONS M.M.: 30

Q1. What is expected value of vant Hoff factor k3 [Fe(CN)6] in dilute solution?

Q2. Why is the elevation in b.p. of water different in the following solutions?

(a) 0.1 molar NaCl solution. (b) 0.1molar sugar solution. Q3. State the formula relating pressure of a gas with its mole fraction in a liquid solution in contact with it.

Q4. what type of azeotrope is formed on mixing nitric acid and water?

Q5. A and B liquids on mixing produce a warm solution. Which type of deviation from Raoults law is there?

Q6. How is the molality of a solution different from its molarity?

Q7. What is the sum of the mole fractions of all the components in a three component system?

Q8. Two liquids X and Y boil at 1100C and 130

0C respectively. Which one of them has higher vapour pressure

at 500C ?

Q9. What happens when blood cells are placed in pure water?

Q10. When is the value of vants Hoff factor more than one ?

Q11. Give reasons for the following: when 30 ml of ethanol and 30 ml of water are mixed, the volume of

resulting solution is more than 60 ml.

Q12. Explain with suitable examples in each case,why the molar masses of some ubstances determined with the

help of colligative properties are (a)higher (b) lower than actual values.

Q13. [A]What are non-ideal solutions? [B]What role dose the molecular interaction play in deciding the vapour

pressure of solutions:(a)alcohol and acetone (b)chloroform and acetone ?

Q14. (a)Why is the vapour pressure of a solution of glucose in water lower than that of water.

(b)A 6.90M solution of KOH in water contains 30% by mass of KOH.Calculate the density of the KOH

solution [Molar mass of KOH=56g mol-1

]

Q15. (a) Urea forms an ideal solution in water. Determine the vapour pressure of an aqueous solution containing

10% by mass of urea at 400 C. (vapour pressure of water at 40

0 C = 55.3mm of Hg)

(b)Why is freezing point depression of 0.1M sodium chloride solution nearly twice that of 0.1 M glucose

solution ?

Q16. State Henrys law for solubility of a gas in a liquid. Explain the significance of Henrys law constant

(KH). At the same temperature , hydrogen is more soluble in water than helium. Which of them will have a

higher value of KH and why ?

Q17. 45g of ethylene glycol C2H6O2 is mixed with 600g of water.Calculate: (a)freezing point depression

(b)freezing point of the solution (Kf for water =1.86K kg mol -1

; Atomic masses: C=12,H=1,O=16 amu)

Q18. The Henrys law constant for oxygen dissolved in water is 4.34 104 atm at 25

0 C.If the partial pressure of

oxygen in air is 0.2 atm under ordinary atmospheric conditions, calculate the concentration (in moles per

litre )of dissolved oxygen in water in equilibrium with air at 250C.

SET 3 TEST PAPER: ELECTROCHEMISTRY M.M.: 25

Q1. Name any two metals, which can be used for cathodic protection of iron. 1

Q2. How is the unit of molar conductivity arrived at ? 1

Q3. How many faradays of electric charge are involved per mole of H2SO4 consumed when the lead

storage battery is in use? 1

Q4. At 291k, molar conductivities at infi nite dilution of NH 4 Cl, NaOH and NaCl are 129.8,

217.4, 108.9 ohm-1

cm2 respectively. If molar conductivity of centinormal solution of NH4OH is 9.33

ohm-1

cm2,what is the degree of dissociation of NH4OH solution? 2

Q5. Predict the products of electrolysis obtained at the electrodes in each case when the electrodes 2

used are of platinum:(a)An aqueous solution of Ag NO3.(b)An aqueous solution of H2SO4.

Q6. Write the cell reaction which occur in lead storage battery (a) When the battery is in use and

(b)When the battery is on charging. 2

Q7. Conductivity of 0.00241M acetic acid is 7.896 X 10-5

S cm-1

.Calculate its molar conductivity.

If for acetic acid is 390.5 S cm2 mol

-1, what is its dissociation constant? 2

Q8. Explain why electrolysis of aqueous solution of NaCl gives H2 at cathode and Cl2 at anode. Write

overall reaction. 2

Q9. How does molar conductivity vary with concentration for (i) weak electrolyte and for (ii) strong

electrolyte ? Gives reason for these variations. 2

Q10. When a certain conductivity cell was filled with 0.1M KCl, it has a resistance of 85 ohm at 250C.

When the same cell was filled with an aqueous solution of 0.052 M unknown electrolyte , the

resistance was 96 ohm. Calculate the molar conductivity of the unknown electrolyte at this

concentration. Specific conductivity of 0.1 M KCl =1.29 X 10-2

ohm- cm

3

Q11. Gives the example of a fuel cell and write the anode and cathode reactions for it . 2

Q12. In the Leclanche cell write the following : (1) The chemical equations involved at the cathode.

(2)Change in the oxidation state of Mn. (3) The complex entity formed between Zn2+

(aq) and NH3(g) 2

Q13. (a) State two advantages of H2 -O2 fuel cell over ordinary cell. (b) silver is electrodeposited on a

metallic vessel of total surface area 900 cm2 by passing a current of 0.5 amp two hours. Calculate the

thickness of silver deposited (Give : Density of silver =10.5g cm-3

Atoms mass silver =108

amu.f=96,500 C mol-) lead storage battery 3

SET 5 TEST : CHEMICAL KINETICS M.M: 25

Q1. The rate of reaction X Y becomes 8 times when the concentration of the reactant X is doubled. Write the rate law of the reaction. 1

Q2. For the reaction A B, the rate of reaction becomes twenty seven times when the concentration of A is increased three times. What is the order of the reaction? 1

Q3. A reaction is 50% complete in two hours and 75% complete in 4 hours. What is the order of the reaction. 1

Q4. A substance with initial concentration a follows zero order kinetics. In how much time will the reaction go

to completion? 1

Q5. Express the relation between the half-life period of a reactant and its initial concentration if the reaction

involved is of second order. 1

Q6. For the reaction 2X X2, the rate of reaction becomes twenty seven times when the concentration of X is increased three times. What is the order of the reaction? 1

Q7. The rate constant of a reaction is 2 10-2

L mol-1

s-1

. What is the order of the reaction? 1

Q8. The rate of a particular reaction triples when temperature changes from 500C to 100

0C.Calculate the

activation energy of the reaction.(log 3=0.477.1;R=8.314JK-1

mol-1

) 3

Q9. A certain reaction is 50%completein 20 minutes at 300K and the same reaction is again 50% complete in 5

minutes at 350K.Calculate the activation energy if it is a first order reaction. (R=8.314JKmol-1

; log 4 =

0.602) 3

Q10. (a) A first order reaction is 15% completed in 20 minutes. How long will it take to complete 60%?

(b) What is the significance of rate constant in a rate law? 3

Q11. Rate constant K of a reaction varies with temperature according to the equation: logK =constant-

Ea/2.303RT; Where Ea is the energy of activation for the reaction. When a graph is plotted for log K versus

1/T, a straight line with a slope -6670K is obtained. Calculate energy of activation for this reaction.

(R=8.314JK-1

mol-1

). 2

Q12. For the reaction at 500 K, NO2 (g)+CO (g) CO2 (g)+NO (g) the proposed mechanism is as below:

(1) NO2+NO2 NO+NO3 (slow) S (2) NO3 + CO CO2 + NO2 (fast), Write the rate law for the reaction. 2

Q13. In a reaction, 2A Products, the concentration of a reactant decreases from 0.5 mol L-1 to 0.4 mol L-1 in 10 minutes. Calculate the rate during this interval. 2

Q.14 A reaction is second order with respect to a reactant. How is the rate of reaction affected if the

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

Q.15 The rate constant for a first order reaction is 60 s-1

. How much time will it take to reduce the initial

concentration of the reactant to its 1/16th

value? 2