, KENDRIYA VIDYALAYA KALIMPONG SESSION(2020-2021)

WINTER BREAK HOLIDAY HOMEWORK ENGLISH FOR STD. XI

1. Write the summary of The Portait of a Lady.

2. Discuss the central idea of the poem A Photograph.

3. Who are the characters of We are Not Afraid to die if we can all be together? Discuss the major characters.

4. Write the sum and substance of Discovering Tut: the Saga Continues.

5. Discuss the concept of Sustainable Development in the light of the chapter The Ailing Planet : the Green Movement’s Role.

6. Discuss two kinds of painting in the light of the chapter Landscape of the Soul.

7. A good teacher may not be popular teacher. Do you agree? Substantiate your answer with the help of the chapter The Browning Version.

8. Write the central idea of the following poems:

i. The Laburnum Top

ii. The Voice of the Rain

9. Write the summary of the following chapters:

i. The Address

ii. Ranga’s Marriage

iii. Mother’s Day

iv. Albert Einstien at School

10. Discuss the poem The Tale of Melon City as a satirical poem.

11. Write the format of the letter to the editor, notice, job application, classified and commercial advertisement, poster, article, speech, debate.

12. Write one sentence of each tense in both the voices.

13. What is model auxiliary verb? Discuss with examples.

14. Discuss determiners with examples by framing sentences.

KENDRIYA VIDYALAYA KALIMPONG

WINTER BREAK HOLIDAY HOME WORK ‘2020

CLASS XI’ 2020-21

SUBJECT : BIOLOGY

1. Prepare a chart to show the diagrammatic stages of mitosis and meiosis .

2. Complete the exercises questions of taught chapters of NCERT text book and exemplar questions . You may take help of these links:

NCERT text book exercise solutions:

https://www.learncbse.in/ncert-solutions-for-class-11-biology/

NCERT exemplar questions with solutions:

https://ncert.nic.in/exemplar-problems.php?ln=

3. Prepare a practical record of core experiments (Part A of the syllabus ).You can observe and record the experiments through this link :

http://www.olabs.edu.in/

*****

केंद्रीय विद्यालय कालिम्पोंग

शीतावकाश गृहकार्य

कक्षा- 11

विषय-हिंदी

सत्र -2020-21

1. आवधिक परीक्षण 2 तक निर्धारित सभी पाठों से पाँच-पाँच अतिलघुउत्तरीय प्रश्न बनाकर उनके उत्तर लिखें.

2.निम्नलिखित विषयों में से किन्हीं दो पर 200-250 शब्दों में निबंध लिखिए-

1- कोरोना: एक विश्व व्यापी महामारी

2- युवाओं में बढ़ती नशाखोरी

3- सोशल मीडिया : सामजिक संबंधों पर खतरा .

3. ‘ट्यूशन की बीमारी’ तथा ‘बढ़ती फैशन परस्ती-घटते मूल्य’ विषय पर एक – एक फ़ीचर लिखिए. .

4.विषय का चुनाव स्वयं करते हुए दो कार्यालयी पत्र लिखिए.

5.निर्धारित कविताओ में से किन्हीं चार का भाव तथा शिल्प- सौंदर्य लिखिए.

6- समाचार के ककारों की समीक्षा करते हुए हिंदी समाचार पत्र से 3 समाचारों को काटकर अपनी पुस्तिका में चिपकाएँ.

7 – शब्दकोश की परिभाषा देते हुए किन्हीं तीन हिंदी शब्दकोशों के नाम लिखिए.

8. आपका ‘शीतावकाश कैसे बीता’ इस पर डायरीनुमा एक लेख लिखिए..

शिक्षक –

सत्य ब्रत जायसवार

(स्ना.शि.हिंदी)

KV Kalimpong

Holiday Home Work

Winter Break

Class XI CS

1.‘Welcome’ is _______________ literals.

2.$ symbol can be used in naming an identifier (True/False)

3.Write any 2 data types available in Python

4.range(1,10) will return values in the range of _____ to _______

5.“Computer Science”[0:6] = ____________

“Computer Science”[3:10] = ____________

“Computer Science”[::-1] = ____________

“Computer Science”[-8:]= ____________

6.Output of : print(“Ok”*4 + “Done”)

7.Output of: print(print(“Why?”))

8.Raj was working on application where he wanted to divide the two number (A and B) , he has written the expression as C = A/B, on execution he entered 30 and 7 and expected answer was 4 i.e. only integer part not in decimal, but the answer was 4.285 approx, help Raj to correct his expression and achieving the desired output.

Correct Expression : _______________

9.Can you guess the output?

C = -11%4

print(C)

10.Write 2 advantages and disadvantages of Python programming language.

11.Identify the valid and Invalid identifiers names:

Emp-Code, _bonus, While, SrNo. , for, #count, Emp1, 123Go, Bond007@

12.Identify the type of literals for each:

(i) 123

(ii) “Hello”

(iii) “Bye\nSee You”

(iv) “A”

(v) 345.55

(vi) 10+4j

(vii) 0x12

13.What is the size of each string?

(i) “Python”

(ii) “Learning@\nCS”

(iii) “\table”

14.Output of :

(i) True + True =

(ii) 100 + False =

(iii) -1 + True =

(iv) bool(-1 + True) =

15.Output of

(i) 2 * 7 = _____

(ii) 2 ** 7 = _____

(iii) 2**2**3 = _____

(iv) 17 % 20 = _____

(v) not(20>6) or (19>7) and (20==20) = _____

16.Output of :

a,b,c = 20,40,60

b+=10

c+=b

print(a,b,c)

17.Num = 100

Isok = False

print(type(Num)) = _______

print(type(Isok)) = _______

18.Rewrite the following code in python after removing all syntax error(s). Underline each correction done in the code.

30=To

for K in range(0,To)

IF k%4==0:

print (K*4)

Else:

print (K+3)

19.Fill in the blanks to execute loop from 10 to 100 and 10 to 1

(i)

for i in range(______):

print(i)

(ii)

for i in range(_______):

print(i)

20.Convert the following ‘for’ loop using ‘while’ loop

for k in range (10,20,5):

print(k)

Physics

Chemistry

Structure of Atom

( Dr.Subrata Pal)

Questions:

Q1. What are Isotopes and Isobars? Give example.

Q2. What is Zeeman Effect and Stark effect?

Q3. Write electronic configurations of Cr, Cu, Zn.

Q4. Define Aufbau’s Principle. Which of the following orbitals are possible.

1 s, 1 p, 2 s, 3 d, 3 f

Q5. Explain Hund’s rule of maximum multiplicity by taking an example of phosphorous.

Q6. What is the difference between atomic mass and mass number?

Q7. Why are Bohr’s orbits called Stationary States?

Q8. Explain why the uncertainty principle is significant only for the microscopic particles

And not for the macroscopic particles?

Q9. Why half-filled and fully filled orbitals are extra stable?

Q10. Why large no. of lines appear in the spectrum of hydrogen although it contains only

One electron?

Q11. Derive de Broglie relationship and give its significance.

Q12. Give important postulates of Bohr’s model of an atom.

Q13. How are anode rays produced?

Q14. Which of the following sets of quantum numbers are not possible?

(i) N = ,3 l = ,2 m = ,0 s = −

(ii) N = ,3 l = ,2 m = − ,2 s = −

(iii) N = ,3 l = ,3 m = − ,3 s = +

(iv) N = ,3 l = ,1 m = ,0 s = +

Q15. Which of the following orbitals are not possible?

1p, 2s, 2p, 3f, 3d, 4f, 4d

Q16. What is the frequency and wavelength of a photon emitted during a transition from

N=5 state to n=2 state in the hydrogen atom.

Q17. What are emission and absorption spectra? Why dark lines appear in the absorption

Spectra?

Q18. What is photoelectric effect? What is the effect of frequency and intensity on

Photoelectric effect?

Practice Paper

CLASS XI SC.

Sub: CHEMISTRY CLASS: XI Sc.

Max. Marks- 70Time: 3 Hrs.

General Instructions:

i. All Questions are compulsory.

ii. Marks for each question are indicated against it.

iii. Questions no. 1-5 are very short answer questions each of 1 mark. Answer these in one word or about one sentence each.

iv. Questions no. 6-10 are short answer type each carrying 2 marks.

v. Questions no. 11-22 are also short answer questions each carrying 3 marks.

vi. Questions no. 23 is a Value Based Question carrying 4 marks.

vii. Questions no. 24-26 are long answer type each carrying 5 marks.

viii. Use log tables if necessary. Use of calculator is not permitted.

1. How many sigma and pi bonds are present in Butene (CH3-CH2-CH=CH2)? 1

2. What is the maximum number of emission lines obtained when the excited electron of H-atom in n=5, drops to ground state? 1

3. Arrange the following elements in increasing order of their Ionization enthalpy: B, C, N and O. 1

4. Determine the oxidation number of Au in AuCl4- ion. 1

5. For the reaction, 2N2O5 (g) 4NO2(G) + O2 (g) , which of the following is correct

1

(i)Kp>Kc (ii) Kp

6. Which has larger dipole moment NH3 or NF3? Justify your answer. 2

7. Using Ideal gas equation, show that at a given temperature, density of the gas is directly proportional to the gas pressure ‘P’. 2

OR

Prove that the partial pressure of a gas ‘A’ in a mixture with non- reacting gases ‘B’ and ‘C” is given by PA = XAX PT ,Where XA is the mole fraction of gas ‘A’. 2

8. What do you mean by limiting reagent in chemical reactions? Determine the amount of CO2 formed when 2 moles of Carbon is burnt with 4 moles of Oxygen. 2

9. Write the electronic configuration of Cu atom (At. No .of Cu= 29) .How many unpaired electron is present in Cu+ ion? 2

10. (i) Give a point of difference between an Isothermal and Adiabatic process. (ii) Which of the following is/are extensive property? Heat capacity, Specific heat capacity, density. 2

11. Define Molality. Calculate the no. of moles of NaOH present in 5 kg of 0.5 (m) aq. Solution of it. 3

12. Determine the mass of (i) 2 moles of H2O. ( H =1U, O = 16U) (ii) Volume of 18 gm. Of H2O ( liquid ) at N.T.P ( Density of water is 1 gm./cc ). 3

13. (i) State Heisenberg’s Uncertainty Principle. 3

(ii)If the velocity of electron in Bohr’s first orbit is 2 X 106 m/s ,then calculate the de-Broglie’s wave length associated with it.( h = 6.626 X 10-34JSec)

14. (i) Using s, p, d and f notation designate the orbital with the following quantum numbers; 3

(a) N =4,l=3 (b) n= 3,l=1

(ii) How many radial nodes are present in 3 s orbital?

15. (i) Arrange the following species in increasing order of their ionic radii : Mg+2 , N-3, O-2 ,Al+3. 3

(ii) F has less negative electron gain enthalpy than Cl although F is more electro negative than Cl. Explain.

(iii) Write the IUPAC name and symbol of an element with atomic no. 124

16. (i) In terms of period, block and group assign the position of an element with atomic no. 23. 3

(ii) Li and Magnesium are similar in properties .Justify the statement.

17. Write the state of hybridization of the central atoms and draw the shapes of the following molecules:

XeF4, SF4, PCl5. 3

18. (i) Give the molecular electronic configuration of nitrogen molecule. 3

(ii) Using molecular Orbital theory, arrange the following molecular ion in increasing order of their bond length:

O2, N2, O2+, O2- .

19. (i) For 0.2 moles of a real gas, write the Vander Wall’s gas equation. 3

(ii) Calculate the pressure exerted by a mixture of 6.4 gm. Methane and 2.2 gm. Of CO2 gas contained in a 10 dm3 flask at 270 C. ( R= 0.0831 lit bar/K/mole).

20. (i) How Gibb’s Free energy is related to equilibrium constant Kc of a reaction? 3

(ii) Predict in which of the following, entropy Increases/ decreases

(a) A liquid crystallizes into solid.

(b) 2Cl(g) Cl2.

21. (i) Balance the following redox by Oxidation no. method : 3

MnO4-+C2O4-2 +H+ Mn+2+ CO 2 + H2O .

(ii) Define with an example of a disproportionation reaction.

22. (i)How many peroxide linkages are present in CrO5 molecule? What is the Oxidation no. of Cr atom 3

In CrO5 molecule?

(ii) Given the standard reduction potential of the following, arrange the metals in increasing order of their reducing power.

Mg+2/Mg= -2.37 v, Cr+3/Cr= -0.74 v, Ag+/Ag= +0.8V and Cu+2/Cu= +0.34 v.

23. Liquor ammonia bottle contains ammonia gas dissolved in water at high pressure. Richa , a student of class XI Sc., wanted to open the cork of Liquor ammonia bottle. Her friend Sarita immediately objected her in doing so , and advised her to cool the mouth of the bottle with cold water and then to open the cork of the bottle. Now answer the following: 4

(i) Why Sarita advised Richa to cool before opening the cork of the bottle?

(ii) Which Law is associated with the dissolution of gas in in water?

(iii) Write the values possessed by Sarita.

24. (i) Write an application of Dalton’s Law of partial pressure. 5

(ii) What are the two Faulty assumption of Kinetic Molecular theory of gas?

(iv) Define Critical Temperature (Tc) and Critical pressure (Pc), of a gas.

The critical temperature of NH3 and O2 gases are 405.4 K and 154.5 K respectively.

Which will liquefy easily?

OR

Account for the following: 5

(i) A falling liquid drop takes a spherical shape.

(ii) The boiling pt. of a liquid is less in Himalayan areas.

(iii) H2S is gas whereas H2O is liquid at room temperature.

(iv) Evaporation causes cooling effect.

(v) Surface tension and Viscosity decreases with the rise in temperature.

25. (i) The enthalpy of formation CO(g), CO2(g),N2O(g) and N2O4(g) are -110, -393,+81 and +9.7 KJ /mole respectively. Determine the Enthalpy change of the reaction: 5

N2O4 (g) + 3CO(g) N2O (g) + 3CO2(g)

(ii) Give the relationship between Cp and Cv for two moles of an Ideal gas.

(iii) State Hess’s Law of Constant Heat Summation.

OR

(i) Write any correct Statement of 2nd Law of Thermodynamics. 5

In a process 800 Joules of heat is absorbed and 380.5 Joules of work is done by the system.What is the change internal energy of the process?

(ii) Calculate the no. of Kilojoules necessary to raise temperature of 81 gm. Of Aluminum from 30 to 50oC.( Molar Heat capacity of Al is 24 Joule/mole/K ; At. Mass of Al=27U)

26. (i) What is the effect of addition of Argon gas at constant volume on production of ammonia gas by Haber’s process. N2(g) + 3H2(g) 2NH3(g)

(iii) Derive a relation between Kp and Kc for a gas phase reaction.

(iv) Write conjugate acid and base of the amphoteric species NH2- ion.

OR

(i) State Le-Chatelier’s Principle. 5

(ii) Calculate the pH of 3X 10-3(M) NaOH solution. ( log3=0.4771)

(iii) The solubility product Ag2CrO4 is 3.2X10-11; What will be its solubility in moles/lit.