KENDRIYA VIDYA LAYA ONGC SIVASAGAR

HOLIDAY HOMEWORK

SUBJECT: BIOLOGY

CLASS 12th

Q 1. Do your investigatory projects on the given topics?

Q 2. Learn all completed chapters (1-5)?

SUMMER VACATION H.W (2018-19)

CLASS-XII A

SUBJECT: CHEMISTRY

1. Analysis shows that FeO has a non-stoichiometric composition with formula Fe0.95O.Give

reason.

2. For the reaction 2N2O5 (g) →4NO2 (g) +O2 (g), the rate of formation of NO2 (g) is 2.8 x10-3Ms-

1.Calculate the rate of disappearance of N2O5 (g).

3. Calculate the freezing point of a solution containing 60g of glucose (Molar mass=180gmol-1)

in 250g of water. (Kf of water=1.86Kkgmol-1).

4. An element X (At. Mass=40gmol-1) having f.c.c.structure, has unit cell edge length of

400pm.Calculate the density of X and the number of unit cells in 4g of X. (NA=6.022x1023mol-1).

5. Give reasons for the following:-

(a)Measurement of osmotic pressure method is preferred for the determination of molar

masses of macromolecules such as proteins and polymers.

(b) Aquatic animals are more comfortable in cold water than in warm water.

(c) Elevation of boiling point of 1M KCl solution is nearly double than that of 1M sugar solution.

6.A first order reaction is 50% completed in 40 minutes at 300K and in 20 minutes

at320K.Calculatetheactivationenergyofthereaction.(Given:log2=0.3010,log4=0.6021,R=8.314JK-

1mol-1).

7. Write the cell reaction and calculate the e.m.f. of the following cell at 298K:-

Sn(s)|Sn2+(0.004M)||H+(0.020M)|H2(g)(1bar)|Pt(s)

(Given:E0Sn

2+/Sn=-0.14V)

8. Give reasons: - (i) On the basis of E0 values, O2 gas should be liberated at anode but it is Cl2

gas which is liberated in the electrolysis of aqueous NaCl.

(ii) Conductivity of CH3COOH decreases on dilution.

9. For the reaction

2AgCl(s) +H2 (g) (1atm) →2Ag(s) +2H+ (0.1M) +2Cl-(0.1M)

∆G0= -43600J at 250C

Calculate the emf of the cell. [log10-n= -n]

10. Define fuel cell and write its two advantages.

11. What is the effect of adding a catalyst on (a) Activation energy (Ea) and (b) Gibbs energy

(∆G) of a reaction?

12. Calculate the number of unit cells in 8.1g of aluminum if it crystallises in a face –centred

cubic (f.c.c) structure.(Atomic mass of Al=27gmol-1).

13. Write the name of the cell which is generally used in hearing aids. Write the reactions taking

place at the anode and the cathode of this cell.

14. (a) Based on the nature of intermolecular forces, classify the following solids:

Silicon carbide , Argon

(b)ZnO turns yellow on heating. Why?

(c) What is meant by groups 12-16 compounds? Give an example.

15. (a) The cell in which the following reaction occurs:

2Fe3+(aq)+2I-(aq)→2Fe2+(aq) +I2(s)

has E0cell=0.236V at 298K.Calculate the standard Gibbs energy of the cell reaction.(Given

1F=96,500C mol-1).

(b)How many electrons flow through a metallic wire if a current of 0.5A is passed for

2hours?(Given:1F=96,500C mol-1).

16.A first order reaction takes 20 minutes for 25%decomposition.Calculate the time when 75%

of the reaction will be completed.(Given:log2=0.3010,log3=0.4771,log4=0.6021).

17.(a)A 10% solution (by mass)of sucrose in water has a freezing point of 269.15K.Calculate the

freezing point of 10% glucose in water if the freezing point of pure water is 273.15K. Given:

(Molar mass of sucrose =342gmol-1) (Molar mass of glucose=180 gmol-1).

(b)Define the following terms (i) Molality (m) (ii) Abnormal molar mass.

18. (a)30g of urea (M=60g mol-1) is dissolved in 846 g of water. Calculate the vapour pressure

of water for this solution if vapour pressure of pure water at 298K is 23.8 mm Hg.

(b) Write two differences between ideal solutions and non-ideal solutions.

19. Write the name of the cell which is generally used in inverters. Write the reactions taking

place at the anode and the cathode of this cell.

20.(a) Based on the nature of intermolecular forces,classify the following solids: Benzene , Silver

(b) AgCl shows Frenkel defect while NaCl does not.Give reason.

(c) What type of semiconductor is formed when Ge is doped with Al?

21.Write the name of the cell which is generally used in transistors.Write the reactions

taking place at the anode and the cathode of the cell.

22. (a) Based on the nature of intermolecular forces , classify the following solids:Sodium

sulphate,,,Hydrogen

(b) What happens when CdCl2 is doped with AgCl?

(c) Why do ferrimagnetic substances show better magnetism than antiferromagnetic

substances?

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. Holiday Homework

Class: XII ASubject: Cornputer Science (C++)

Q No.1) Write a short note on Communication Protocols.

Q No.2) Write a short note on Wireless,4r4obile Computing.

Q No.3) Write a shot note on Web Browse and Web Server, Web Hosting, Web 2.0,

Html, XML, DHTML & Web Scripting.

Q No.4) Write a short note on Network Security Concepts.

Q No.5) Write a short note on Viruses.

Q No.6) Write short notes on Different Online Payrnent Medrod.

Class: XII A/B/CSubject: lnformatics Practices

Q No. 1 ) Write a short note Networking Concept.

Q.No.2) Write short notes on SQl(Revision Tour of Class XI).

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HOLIDAY HOMEWORK SUMMER VACATION (2018-19)

CLASS-XII SUB: ENGLISH

1. Collect two Reading passages of 10 and 12 marks and answer the questions given there. You can

Xerox the passage and paste it before writing the answers.

2. Make Notes on any three of the following chapters:

(i) Deep Water

(ii) The Rattrap

(iii) The Enemy

(iv) Should Wizard Hit Mommy?

3. Prepare a BIO-DATA/RESUME of your own. Look for the FORMAT suitable for preparing the

same. The Educational qualification must be made in a table.

4. Read the first five chapters of The Invisible Man and do the following:

(i) Write the summary of your own for those chapters.

(ii) Write down at least 5 questions and answers based on the chapters.

5. Write a speech to be delivered in the Morning Assembly on any one of the following topics:

(i) Influence of Media on Public Opinion

(ii) Outdoor Games a must for growth of Children

Md. Ali Ahmed PGT(English)

KENDRIYA VIDYALAYA ONGC SIVASAGAR

SUMMER VACATION ASSIGNMENT

SUB-MATHEMATICS

CLASS-XII

1. Let * is a binary operation on the set of all non-zero real numbers given by 𝑎 ∗ 𝑏 =𝑎𝑏

5

for all a, b є R – {0}. Find the value of x, given that 2 ∗ (𝑥 ∗ 5) = 10.

2. If S is the set of all rational numbers except 1 and * be defined on S by

𝑎 ∗ 𝑏 = 𝑎 + 𝑏 − 𝑎𝑏, for all a, b є S. Prove that

I. * is a binary operation on S.

II. * is commutative as well as associative.

3. If * is a binary operation on Q, defined by 𝑎 ∗ 𝑏 =3𝑎𝑏

5. Show that * is commutative as

well as associative. Also find its identity, if it exists.

4. Write fog, if 𝑓: 𝑅 → 𝑅 and 𝑔: 𝑅 → 𝑅 are given by 𝑓(𝑥) = |𝑥| and (𝑥) = |5𝑥 − 2| .

5. If 𝐴 = {1,2, … … . ,9} & R be the relation in A×A defined by (a, b) R (c, d). If

a + d = b + c for (a, b), (c, d) in A×A. Prove that R is an equivalence relation.

6. Find the inverse of the following matrices by using elementary row transformations:

I. 𝐴 = [1 3 −2

−3 0 −12 1 0

]

II. 𝐵 = [1 2 32 5 7

−2 −4 −5]

7. All miscellaneous questions from the chapter “Relations and functions”.

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KENDRIYA VIDYALAYA

ONGC SIVASAGAR

HOLYDAY HOME WORK

SUB : PHYSICS

CLASS- XII

Q1- An electic dipole is formed by + 4uC and

-4uC charges at 5mm distance. Calculate

the dipole moment and give its direction.

Q2- An electric dipole of dipole moment 4 x

10-5C m is placed in auniform electric field

of 10-3 NC-1 making an angle of 30 . with the

direction of the field. Determine the torque

exerted by the electic field on the dipole.

Q3- A dipole consisting of an electron and a

proton separated by a distance of 4 x 10-10

m is situated in an electric field of intensity

3 x 105 NC-1 at an angle of 30 . with the

field. Calculate the dipole moment and the

torque acting on it. Charge on an electron =

1.602 x 10-19 C.

Q4- An electric dipole consists of two

opposite charges of magnitude 2 x 10-6 C

each and separated by a distance of 3cm . It

is placed in an electric field of 2 x105 NC-1 .

Determine the maximum torque on the

dipole.

Q5- Two point charges of + 0.2 uC are

separated by 10-8 m . Determine the electric

field at an axial point at a distance of 0.1

m from their midpoint.

Q6- Calculate the field due to an electric

dipole of length 10 cm and consisting of

charges of + 100 C and -100 C.

KENDRIYA VIDYALAYA ONGC SIVASAGAR

SUMMER HOLIDAY HOMEWORK – 2018-2019

CLASS-12 ARTS SUB-POLITICAL SCIENCE

Q.1What is the full form of USSR ? Write three economic and political features of USSR.

Q.2Mention the names of any four countries which are neither the members of NATO nor the warsaw pact.

Q.3 How did the state of Hyderabad become a part of the Indian union after partition.

Q.4What was the approach of Government of India towards the princely states immediately after the

partition of India in 1947.

Q.5What is cold war? Why did the superpowers depend on military alliances with smaller countries? Explain

any three reasons.

Q.6Examine any six factors which led to the disintegration of the former soviet union.

Q.7Name four founders of NAM and the countries they belonged to respectively.

Q.8Make a project on major challenges faced by india at the time of independence and consequences of

partition. Or

Make a project about the ideologies of socialist party, CPI, bhartiya jan sangh and swatantra party.

HOLIDAY HOME WORK CLASS – XII B

SUBJECT- GEOGRAPHY SESSION 2018-19

ACTIVITY (1) Write a short essay and draw a set of pictures illustrating growth without

development and growth with development. ACTIVITY (2) Talk to the vegetable vendor in your neighborhood and find out if she has gone

to school. Did she drop out of school? Why? What does this tell about her choices and freedom she has? Note how her opportunities were limited because of her gender, caste and income.

ACTIVITY (3) Looking at the data in Appendix (i) and (i) A arrange the Indian states and union territories according to their size and population and find out:- (a) States /UTs of large size and large population. (b) States /UTs of large size but small population. (c) States /UTs of smaller size but larger population.

Map Work:- Locate the top ten countries with high HDI scores on a map. Find out what

these countries have in common.

HOLYDAY HOME WORK 2018-19 (HISTORY) CLASS XII-B

Do holyday home work in separate copy.

Q.1 who was Cunningham? Q.2 What was the strategy that use by Harappan people to procure raw materials? Q.3 How do archaeologists trace socio-economic differences in Harappan society? What are the differences that they notice?. Q.4 Would you agree that the drainage system in Harappan cities indicates town planning? Give reason for your answer. Q.5 Analyze the causes of the decline of the Harappan civilization. Q 6 Describe the source used to construct the history of Maurayan Empire Q 7 write the main features of the Mahajanapada.

Q.8 what were the strategies adopted by the people of India to increase the production of

agriculture.

Q.9 Discuss the main features of Mauryan administration. Which of these elements are evident

in the Ashokan inscriptions that you have studied.

Note: Learn Ch- 1 , 2 and read Ch – 3.

SUMMER VACATION ASSIGNMENT (MAY-JUNE 2018)

CLASS XII – C

ISSUE DATE: 09/05/2018 SUBMISSION DATE: 21/06/2018

ACCOUNTANCY

Prepare a project on the topic:

Work on a comprehensive problem, which would involve you from the initial stage

of accounting till the financial stage. For this visit any organization and analyze their

accounts.

BUSINESS STUDIES (Any 1)

A project work based on Management Principles- A comparative study of the

Principles of management by Fayol & principles of scientific management by

Taylor and its application in ONGC ltd or any institution as per student’s

convenience.

Fayol’s Principles of Management- A case study on Private Schooling in Sivasagar.

Integrated business project – Entrepreneurship & New venture planning.

(Sumit Mazumder)

PGT- COMMERCE

K.V. ONGC SIVASAGAR