KENDRIYA VIDYALAYA DRDO,C V RAMAN NAGAR ,BENGALURU

SUMMER BREAK – HOLIDAY HOMEWORK

CLASS XII -ENGLISH CORE

INSTRUCTIONS :

a) The holiday homework should be done in a separate 100 pg long book and

submitted on reopening day.

b) The infographic must be submitted on the g-classroom page under holiday

homework.

c) Stick to word limit and time yourself while doing the questions.

1. Prepare a infographic on the topic assigned .It is a pair work and please ensure

your names and class are clearly indicated on the infographic. Infographics are

similar to posters but may have 1 or more templates fused together. Try and

keep it as 1 or maximum 5 templates together. Please do deligent research into

the assigned topics and make it as informative as possible. Avoid plaigarism

.[Research based assignment]

2. You are the President of the Students’ council of St. Francis Sr. Secondary

school, Bangalore. You have invited a visiting Russian Ballet Troupe to give a

performance in your school on the occasion of its Golden Jubilee celebrations.

Write a notice in about 50 words, informing the students about this event. sign

yourself as Rohit/Rakhi.

3. Today’s children are not yet aware of many opportunities awaiting them after

they complete their school education. As an academic counsellor give a talk to

the students of St Antony’s School on the need for career guidance and how

knowledge of the available careers can benefit the youth. Write the speech in

150-200 words.

4. You are Simar / Smriti of Lotus International School, Jodhpur. Your school is

organizing a workshop on „Prevention of Drug Abuse‟ in the coming week.

Prepare a poster with complete information for the students of class X-XII.

5. You are Mukul / Mahima of Alps Public School. Your school has organized a

debate on “Social Media and It‟s Effects” and you will be participating from

your school. Prepare your views against or in favour of the motion. (150-200

words)

6. By 2050, India will be amongst the countries which will face acute water

shortage. You are highly alarmed and terrified of the future world without

water. So, write an article on „Save water- are we doing enough?‟ for the local

daily in 150-200 words.

7. Public demonstration causes a lot of disturbance in daily routine of common

man. You almost missed your important entrance examination as people

blocked the highway. As Tarun / Taruna, a student aspiring to be a doctor, write

a letter to the Editor of The Times of India highlighting the need to discourage

such demonstrations and disturbance by public on highways which cause a

great loss of time and opportunity for many. (100-125 words)

8. You are Tarun / Taruna who bought a new Luminous Inverter for your home

from R.K.Electronics, Noida but found many functional problems as the

charging is not done properly and battery water is getting leaked. Write a letter

of complaint to the proprietor to take care of the same. (100-125 words)

SUMMER VACATION – HOLIDAY HOME WORK CHEMISTRY- CLASS- 12 (2021-22) 1. CHAPTER :SOLID STATE

Q1. Why does zinc oxide exhibit enhanced electrical conductivity on

heating ?

Q2. Give reasons :

(a) Why is frenkel defect found in AgCl ?

(b) What is the difference between phosphorous doped and gallium doped

silicon semi conductors ?

Q3. The electrical conductivity of metals decreases with rise in temperature while

that of a semi conductor increases.Explain .

Q4. What are interstitial voids ? Discuss tetrahedral and octahedral voids in a close

packed arrangement?

Q5. If the radius of the octahedral void is r and radius of the atoms in close packing is

R. Derive relation between r and R.

Q6. Analysis shows that a metal oxide has the empirical formula M0.98 O1.00 .

Calculate the percentage of M2+ and M3+ ions in the crystal.

Q7.A compound forms hexagonal close packed structure. What is the total number of

voids in 0.5 mol of it ? how many of these are tetrahedral voids ?

Q8. How many lattice points are there in one unit cell of each of the following lattice

?

(a) Face centered cubic (b) face centered tetragonal

(c) Body centered.

Q9. In a solid ‘AB ‘,’A’ atoms have ccp arrangement and ‘B’ atoms occupy all the

octahedral sites. If all the face centered atoms along one of the axes are removed,then

what will be the resultant stoichiometry of the compound ?

Q 10. Examine the given defective crystal:

Answer the following questions:

(i) Is the above defect stoichiometric or non-stoichiometric?

(ii) Write the term used for the electron occupied site.

(iii) Give an example of the compound which shows this type of defect

Q11.Aluminium crystallises in a cubic close-packed structure. Radius of the atom in the metal is 125 pm. (i) What is the length of the side of the unit cell? (it) How many unit cells are there in 1 cm3 of aluminium?

Q 12. (a)What are intrinsic semiconductors? Give an example.

(b) What is the distance between Na+and Cl– ions in NaCl crystal if its density is

2.165 g cm-3. [Atomic mass of Na = 23 u, Cl = 35.5 u, Avogadro’s Number = 6.023

X 1023}

2. CHAPTER : SOLUTION

Q1. An aqueous solution containing urea was found to have boiling point more than

the normal boiling point of water (373.13K). when the same solution wascooled it

was found that its freezing point is less than the normal freezing point of water

(273.13K ).Explain these observations.

Q2.(a) State henrys law and mention its two important applications.

(b) Which of the following has higher boiling point and why? 0.1 M NaCl or 0.1

M glucose.

Q3. At 10 °C,the osmotic pressure of urea solution is 500 mm Hg. The solution is

diluted and the temperature is raised to 25°C, when osmotic pressure is found to be

105.3 mm Hg. Calculate the extent of the dilution.

Q4. (i) On mixing liquid X and liquid Y, volume of the resulting solution decreases.

What type of deviation from Raoult’s law is shown by the resulting solution? What

change in temperature would you observe after mixing liquids X and Y? .

(ii) What happens when we place the blood cell in water (hypotonic solution)? Give

reason.

Q5. Derive the relationship between relative lowering of vapour pressure and molar

mass of the solute

Q6. . (i)On mixing liquid X and liquid Y, the volume of the resulting solution

increases. What type of deviation from Raoult’s law is shown by the resulting

solution? What change in temperature would you observe after mixing liquids X and

Y?

(ii) How can the direction of osmosis be reversed? Write one use of reverse

osmosis.

Q7. When 1.5 g of a non-volatile solute was dissolved in 90 g of benzene, the boiling

point of benzene raised from 353.23 K to 353.93 K. Calculate the molar mass of the

solute. (Kb for benzene = 2.52 kg mol-1)

Q8. 3.9 g of benzoic acid dissolved in 49 g of benzene shows a depression in freezing

point of 1.62 K. Calculate the van’t Hoff factor and predict the nature of solute

(associated or dissociated).;(Given: Molar mass of benzoic acid = 122 g mol-1, Ky for

benzene = 4.9 K kg mol-1)

Q9. Some ethylene glycol, HOCH2CH2OH, is added to your car’s cooling system

along with 5 kg of water. If the freezing point of water glycol solution is -15°C, what

is the boiling point of the solution. [Kft = 0.52 K kg mol-1 and Ky = 1.86 K kg mol-

1 for H2O)

Q10. (a) Define the following terms:

(i) Molarity (ii) Molal elevation constant (Kb) ‘

(b) A solution containing 15 g urea (molar mass = 60 g mol-1) per litre of solution in

water has the same osmotic pressure (isotonic) as a solution of glucose (molar mass =

180 g mol-1) in water. Calculate the mass of glucose present in one litre of its

solution.

CHAPTER 3 : ELECTROCHEMISTRY

Q1. Calculate the time to deposit 1.5 g of silver at cathode when a current of 1.5 A

was passed through the solution of AgNO3. (Molar mass of Ag = 108 g mol-1, 1 F =

96500 C mol -1).

Q2. 6. Accounts for the following

(i) Rusting of iron is quicker in saline water than in ordinary water.

(ii) Blocks of magnesium are straped to the steel hubs of ocean going ships.

Q3. (a) Following reactions occur at cathode during the electrolysis of aqueous

sodium chloride solution:

Na+(aq) + e-1 ——-> Na(s) E° = – 2.71 V

H+(aq) + e-1 ——–> 1/2H2(s) E° = 0.00 V

On the basis of their standard reduction electrode potential (E°) values, which

reaction is feasible at the cathode and why?

(b) Why does the cell potential of mercury cell remain constant throughout its life?

Q4. Calculate E°ceI1 and ∆rG° for the following reaction at 25 °C:

A2+(aq) + B+(aq) ——–> A5+(aq) + B(s)

Given Kc=1010, 1F=96500 C mol-1

Q5. Calculate E°cell for the following reaction at 25 °C:

A + B2+ (0.001 M) ——–> A2+ (0.0001 M) + B

Given : Ecell = 2.6805 V, 1 F = 96500 C mol-1

Q6. Conductivity of 2.5 X 10-4M methanoic acid is 5.25 X 10-5 S cm-1 Calculate its

molar conductivity and degree of dissociation.

Given: ∆°(H+) = 349.5 S cm2 mol-1 and ∆°(HCOO– ) = 50.5 S cm2

Q7. The conductivity of 0.20 mol L-1 solution of KC1 is 2.48 X 10-2 S cm-1.

Calculate its molar conductivity and degree of dissociation (a). Given X,°(K+) = 73.5

S cm2 mol-1 and Z°(cr) = 76.5 S cm2 mol-1.

(b) What type of battery is mercury cell? Why is it more advantageous than dry cell?

Q8. State Kohlrausch law of independent migration of ions. Why does the

conductivity of a solution decrease with dilution?

Q9. Set up Nernst equation for the standard dry cell. Using this equation show that the voltage of dry cell has to decrease with use. Q10. Define the following terms: (i) Limiting molar conductivity (∆°m) (ii) Fuel cell

Q11. (a) Calculate ∆rG° for the reaction: Mg(s) + Cu22+(aq) > Mg2+(aq) + Cu(s) Given: E°cell = + 2.71 V, 1 F = 96500 C mol-1

(b) Name the type of cell which was used in Apollo space programme for providing electrical power. Q12. (i) Write two advantages of H2 – 02 fuel cell over ordinary cell. (ii) Equilibrium constant (Kc) for the given cell reaction is 10. Calculate E°cell.

Holiday HW for class XII BIOLOGY May 2021

To be written in separate 100 pages notebook

Answer the following with suitable diagrams

1.What are vegetative propagules. Namefiveof them with suitable examples.

2.Why is ginger considered as underground stem.gie4 reasons

3.Differentiate the following

a.zoospores and zygospores

b.conidia and gemmule

c.perisperm and pericarp

d.albuminous and non albuminous seed

e.parthenogenesis and parthenocarpy

f.Apomixis and poly embryony.

4.Explain spermatogenesis and Oogenesis with schematic diagram.

5.Explain the process of fertilisation upto implantation with neat and labelled

diagram.

6.Explain microsporogenesis with a labelled diagram of anther.Gie the

structure of mature pollen.

7.What is menstrual cycle.Explain the changes taking place in ovary and uterus

during the cycle.writeabout therole of hormones.

8.What ART? Explain any 4 techniques adopted by the couple's and when.

9.Explain the different contraceptive methods adopted by couple to avoid

unwanted pregnancy.

10.Differentiate the function of copper releasing IUD and non medicated IUD.

11.What is amniocentesis.Why is there a statutory ban?

12.Give the need of sex education in schools. What are the qualities of an ideal

contraceptive.

13.Explain megasporogenes with need diagrams.why is it called monosporic

development.

14.Draw labelled diagram of the male reproductive system with the accessory

glands involved

15.What is double fertilisation and triple fusion.Explain with diagram.

KENDRIYA VIDYALAYA DRDO BENGALURU

SUMMER HOLIDAY HOMEWORK -2021

CLASS 12ABC MATHEMATICS 1.IF A is a 3X3 matrix whose elements are given by aij =

1

3[−3𝑖 + 𝑗] then write the value of 𝑎23

2.If A = diag(3,-1) then find the matrix A

3.Given matrix A=[3 −1 24 5 91 3 4

]write the value of 3𝑎22 − 4𝑎33

4.write the value of x- y + z from the following equation

[

𝑥 + 𝑦 + 𝑧𝑥 + 𝑧𝑦 + 𝑧

]=[957

]

5.if A =[𝐶𝑂𝑆 ∝ −𝑠𝑖𝑛 ∝𝑠𝑖𝑛 ∝ 𝑐𝑜𝑠 ∝

] 𝑡ℎ𝑒𝑛 𝑓𝑜𝑟 𝑤ℎ𝑎𝑡 𝑣𝑎𝑙𝑢𝑒 𝑜𝑓 ∝ 𝐴 𝑖𝑠 𝑎𝑛 𝑖𝑑𝑒𝑛𝑡𝑖𝑡𝑦 𝑚𝑎𝑡𝑟𝑖𝑥

6.If A =[0 𝑎0 0

] 𝑡ℎ𝑒𝑛 𝐴16 𝑖𝑠 − − − − − −𝑚𝑎𝑡𝑟𝑖𝑥

7. If A is a square matrix such that 𝐴2 = 𝐴, 𝑡ℎ𝑒𝑛 (𝐼 + 𝐴)2 − 3𝐴 𝑖𝑠 a) I b)2A c)3I d) A

8.If matrix X is such that

X[3 9 −12 4 5

] = [1 3 02 1 5

] then order of the matrix X is------------------

9.If [1 23 4

] [3 12 5

] = [7 11𝑘 23

]

Then write the value of k

10.IF matrix A=[0 20 0

]and 𝑓(𝑥) = 1 + 𝑥 + 𝑥2 + 𝑥4 + 𝑥8 + 𝑥16 𝑓𝑖𝑛𝑑 𝑓(𝐴)

11.If matrix A=[𝑎 𝑏𝑐 −𝑎

] 𝑖𝑠 the square root of the 2x2 identity matrix, then find the relation between

a, b and c

12. Find the matrix X so that

X[1 2 34 5 6

] = [−7 −8 −92 4 6

]

13.If 𝑋𝑚𝑥3𝑌𝑃𝑋4 = 𝑍2𝑋𝑏 for three matrices X , Y and Z find the values m, p and b

14.IF A and B are two matrices such that AB=B and BA=A then write 𝐴2 + 𝐵2 in terms of A and B

15. Given A=[1 11 1

] 𝑎𝑛𝑑 𝐴100 = 2𝐾𝐴, THEN FIND K

16.The diagonal elements of a skew symmetric matrix are ----------------

17. For what value of x ,is the matrix A=[0 1 −2

−1 0 3𝑋 −3 0

] A SKEW SYMMETRIC MATRIX?

18.If the matrix A=[0 𝑎 −32 0 −1𝑏 1 0

] is skew symmetric find the values a and b.

19.Express the following matrix as the sum of a symmetric and a skew symmetric matrix and verify

your result [3 −2 −43 −2 −5

−1 1 2]

20.if A=[2 0 12 1 31 −1 0

]

Find𝐴2 − 5𝐴 + 4𝐼 and hence find a matrix such that 𝐴2- 5A + 4I + X = 0 Type equation here. 21.if A is matrix of order 3x3 then |KA|= − − − − − − − − − − − − − − −

22.If x≠y≠z and A =|𝑥 𝑥2 1 + 𝑥3

𝑦 𝑦2 1 + 𝑦3

𝑧 𝑧2 1 +𝑍3

|=0

then show that if 1+xyz=0.

23.Using the properties of determinants solve the following for x

|𝑥 − 2 2𝑥 − 3 3𝑥 − 4𝑥 − 4 2𝑥 − 9 3𝑥 − 16𝑥 − 8 2𝑥 − 27 3𝑥 − 64

|= 0

24.when matrix method solve the following system of equations for x,y and z. 2

𝑥−

3

𝑦+

3

𝑧= 10 ,

1

𝑥+

1

𝑦+

1

𝑧= 10,

3

𝑥−

1

𝑦+

2

𝑧= 13

25.use product [1 −1 20 2 −33 −2 4

] [−2 0 19 2 −36 1 −2

]to

Solve the system of equations 𝑥 − 𝑦 + 2𝑧 = 1 , 2𝑦 − 3𝑧 = 1 ,3𝑥 − 2𝑦 + 4𝑧 = 2

PYTHON PROGRAMMING PROBLEMS ( 12th MAY- 2020/ TUESDAY )

1. Write a Program to create a mirror of the given string.

For example,"abc"="cba".

2. Write a Program that removes all the occurrences of a specified character from a

given string.

3. Write a Program to check whether a string is a palindrome or not.

4. Write a Program to reove all the occurrences of a given word from the string.

5. Write a Program to concatenate two strings in a third string.Do not use + operator.

6. Write a Program to swap two strings.

7. Write a Program to insert a string in another string.

8. Write a Program to delete a string from another string.

9. Write a Program to replace a string from another string. Do not use the replace ().

10. Write a Program that removes leading and trailing spaces from a string.

11. Write a Program to read a name and then display it in abbreviated from ,like Janak

Raj Thareja should be displayed as JRT.

12. Write a Program to read a name & then display it in abbreviated from ,like Janak Raj

Thareja should be displayed as J.R.Thareja.

13. Write a Program to count the number of characters, words,and lines in the given text.

14. Write a Program to count the number of digits,uppercase characters,lower case

characters,and special characters,in a given string.

15. Write a Program to extract the first n characters of a string.

16. Write a Program to copy n characters of a string from the mth position in another

string.Do not use the slice operation.

17. Write a Program to delete the last character of a string.

18. Write a Program to delete the first character of a string

19. Write a Program to encrypt a string using substitution Cipher.

20. Write a Program that encrypts a string using multiplicative Cipher.Generate the key

randomly.

21. Write the command to print "hello world" as "Hello World".

22. Write a Program that prompts user to enter a string and returns in alphabetical order,

a letter and its frequency of occurrence in the string.(Ignore case).

23. Write a Program that has a dictionary of your friends name ( as keys) and their

birthdays.Print the items in the dictionary in a sorted order.Prompt the user to enter a

name and check if it is present in the dictionary.If the name does not exist,than ask

the user to enter DOB.Add the details in the dictionary.

24. Write a Program that displays a menu and its price., Take the order from the

customer,Check if the ordered product is in the menu.In case it is not there,the

customer should be asked to reorderand if it is present, then product should be added

in the bill.

25. Write a Program that prints the maximum and minimum value in a dictionary.

26. Write a Program to get a dictionary from an object’s fields.

27. Write a Program to remove duplicates from a dictionary.

28. Write a Program to check whether a dictionary has some key-value pairs stored in it

or not.

29. Write a Program to implement a user-defined stack.

30. Write a Program to implement a user-defined queue.

31. Write a Program that prints the maximum value of the second half of the list.

32. Write a Program that finds the sum of all the numbers in a list using a while loop.

33. Write a Program that finds the sum of all even numbers in a list.

34. Write a Program that reverse a list using a loop.

35. Write a Program to find whether a particular element is present in the list using a

loop.

36. Write a Program that prompts the user to enter an alphabet.Print all words in the list

that starts with that alphabet.

37. Write a Program that prints all consonants in a string using list comprehension.

38. Write a Program that promts a number from user and adds it in a list.If the value

entered by user is greater than100 ,then add "EXCESS" in the list.

39. Write a Program that counts the number of times a vcalue appears in the list.Use a

loop to do the same.

40. Write a Program to insert a value in a list at the specified location using while loop.

41. Write a Program that creates a list of numbers from 1-50 that are either divisible by 3

or divisible by 6.

42. Write a Program using filter function to a list of cubes of numbers from 1-10.

43. Write a Program to create a lsit of numbers in the range 1 to 20.Then delete all the

numbers from the the list that are divisible by 3

44. Write a Program to find the sum of all values in list using reduce ( ) function.

45. Write a Program to transpose two matrices.

46. Write a program that displays information about an employee.Use nested dictionary

to do the task.

KENDRIYA VIDYALAYA DRDO, C V RAMAN NAGAR, BANGALORE-560093

HOLIDAY HOME WORK

CLASS: XII SUBJECT: PHYSICS

1. NCERT TEXT BOOK EXERCISES FOR CHAPTER 1, CHAPTER2 & CHAPTER 3

2. LAST 5 YEAR BOARD QUESTIONS & NUMERICALS WITH SOLUTIONS FROM CHAPTER -1 ,

CHAPTER- 2 & CHAPTER- 3

3. ANSWER THE FOLLOWING QUESTIONS

A) Obtain the expression for electric field due to dipole on the Axial line

B) Obtain the expression for the electric field due to dipole on equatorial line

C) Show that dipole placed in a uniform electric field experiences torque.

D) Using Gauss’s theorem find the eclectic field intensity due to (1) infinite line of charge (ii)

infinite plane sheet

E) Show that capacitance of parallel plate increases when dielectric slab is introduced between

the parallel plates of the capacitor

F) Show that electric potential due to dipole on its equatorial line is zero

G) Obtain the expression for energy stored in the capacitor.

H) Define drift velocity and derive the expression for drift velocity?

I) Obtain the relation between resistivity and relaxation time using ohm’s law,

J) State and prove wheat stone bridge principle? Explain how meter bridge is used to find an

un known resistance of the given wire in the laboratory?

K) Using principle of potentiometer, 1) compare the emf’s of two primary cells

2) internal resistance of the cell?

ग्रीष्मावकाशकालीन गृहकार्य: कक्षा-12

प्रश्न1-निम्न निषय ों पर निबोंध निखें---

(1) निट इों निया मूिमेंट

(2) स शि मीनिया एक आिश्यकता

(3) िैनिक महामारी क निि19

(4) स्वच्छता अनियाि

प्रश्न2-नकसी समसामनयक निषय पर आिेख एिों िीचर निखें।

प्रश्न3- पाठािुसार पुिरािृनि करें तथा उसे कापी मे िी निखें।

प्रश्न4- पढी हुई नकसी िी पुस्तक की समीक्षा निखें।

प्रश्न5- पत्र-िेखि

औपचाररक पत्र-2

अिौपचाररक पत्र-2

प्रश्न6- जिसोंचार के 10 प्रश्न प्रनतनिि याि करके कापी मे निखें।