weekly assignmentmonth- december week – 5 class- vii subject- geography complete the following...

Month- DECEMBER Week – 5

Class- VII Subject- English

Complete the following assignment questions Question 1:

What do you understand by the ‘flash point’ of a fuel?

Question 2:

(i) What are some common uses of fire?

(ii) In what sense is it a “bad master”?

Question 3:

Match items in Column A with those in Column B.

A B

(i)

(ii)

(iii)

fuel

oxygen

heat

-

-

-

-

-

-

-

lighted matchstick

air

coal

burning coal

wood

smouldering paper

cooking gas

Question 4:

What are the three main ways in which a fire can be controlled or put out?

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Question 5:

Match the items in Box A with those in Box B

A

(i) To burn paper or a piece of wood,

(ii) Small fires can be put out

(iii) When water is spread on fire,

(iv) A carbon dioxide extinguisher is the best thing

(v) Space left between buildings

B

• it absorbs heat from the burning material and

• lowers the temperature.

• reduces the risk of fire.

• with a damp blanket.

• we heat it before it catches fire.

• to put out an electrical fire.

Question 6:

Why does a burning candle go out when you blow on it?

Question 8:

What are some of the things you should do to prevent a fire at home and in the school?

Question 1: grammar

Find ten examples of verbs in the simple present tense in the text ‘Fire: Friend and Foe’ and write them down here. Do not include any passive verbs.


Class- VII Subject- Hindi

Complete the following assignment questions न न ल खत न के उ र 2 स े4 पंि तय म ल खए|

1)र तदान- महादान इस कथन का आशय प ट कर 2)एनी मया स ेबचने के लए हम या- या खाना चा हए? 3)र त के बहाव को रोकन ेके लए या करना चा हए? 4) लड बक म र तदान से या लाभ है?

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Class- VII Subject- Marathi

Complete the following assignment questions

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Class- VII Subject- Maths

Complete the following assignment questions 1. Ram and Shyam share a reward of Rs 48 in a ratio of 6 : 2. How much does Ram get? 2. A machine is sold by A to B at a profit of 10% and then B sold it to C at a profit of 20%. If C paid Rs 1200 for the machine, what amount was paid by A to purchase the machine? 3. If 75% of students in a class have bicycle. What percent of student do not have bicycle? 4. The weight of one ball is 15kg. Find the weight of 10 such balls. 5. By selling an AC for Rs 18000, I loose 20%. What did I pay for it? 6. In how many years will Rs 750 amount to Rs 900 at 4% per annum? 7. The population of a town in 2005 was 1800000 and in 2009 was 2100000. Find the increase per cent. 8. What is the rate of interest which yields an interest of Rs 280 on a sum of Rs 56000 for 2 years. 9. In a fabric, cotton and synthetic fibres are in the ratio 2:3.What is the percent of cotton fibre in the fabric? 10. What is the Interest on Rs 12000 for 1 month at the rate of 10 % per annum

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Class- VII Subject- Physics

Complete the following assignment questions 1. What precautions one must observe while working with the electricity?

2. How can you conserve electricity?

3. Can we use same fuse in a geyser and a television set or any other

electrical appliances? Explain.

4. Why do birds do not get shock when they sit on high power live wire but

we do?

5. Define : Electric Current

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Class- VII Subject- Chemistry


1 The water bearing layer of the earth called P is made up of two components O and R, in which R water collect under the ground. The top level of layer Pis called S. When too many tubewells are used in an area, the level of S in that area goes down. What are P, Q, R and S?

2 How can you observe the three forms of water (a) in nature and (b) at home?

3 Mention three causes of water scarcity in our country.

4 A number of problems can be faced due to shortage of water. List some of them.

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Class- VII Subject- Biology

Complete the following assignment questions 1. Why is heart known as the pumping organ of the human body?

2. Differentiate between arteries and veins.

3. Enlist the functions of blood.

4. Why is blood needed by all the parts of the body?

5. Why blood is red in colour?

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Class- VII Subject- History

Complete the following assignment questions 1. Describe the most important features of culture of your reason, focusing on buildings, performing arts and paintings. 2. Choose one state each from north, east, west, south and central India. For each of these prepare a list of foods that are commonly consumed. 3. Choose another set of five states from each of these regions and prepare a list of cloths that are generally worn by women and men in each.

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Class- VII Subject- Geography

Complete the following assignment questions -------------------------------------------------------------------------------- 1. Name the most abundant elements forming the crust of the earth. 2.Distinguish between rocks and minerals. 3.Explain the work of water cycle with diagram. 4.What causes waves? 5. Write notes on Frontal rainfall and Orographic rainfall. 6. Explain the relation between pressure and atmosphere. 7.Disuss the impact of rise in earth’s temperature or global warming. 8. Name some of the famous waterfalls in the world and in India. 9.How does the wind modify the surface of the earth? -----------------------------------------------------------------------------------

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Class- VIII Subject- English

Complete the following assignment questions A Visit to Cambridge

Extra Questions

1. What did Hawking reply when author asked “Is there any advice you can give disabled people, something that might help make life better”? 2. The author had got appointment only for half an hour then why did he stay there for some more time? 3. Describe the emotions of the author at the end of the chapter. 4. The narrator called him ‘a beautiful man’. How does he define beauty?

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Class- VIII Subject- Hindi


1) यह सबसे क ठन समय नह ंइस क वता का उ दे य ल खए| 2) टेशन पर लगी लोग क भीड़ या कट करती है? 3) अभी भी दबा है च ड़या क च च म तनका इस पंि त का आशय प ट क िजए| 4) च ड़या च च म तनका दबाकर उड़ने क तैयार म य है ? वह इसका का या करती होगी?

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Class- VIII Subject- Marathi


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Class- VIII Subject- Maths

Complete the following assignment questions 1.

2

3

4

5

6

7

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Class- VIII Subject- Physics

Complete the following assignment questions 1) What do you mean by phenomenon?

2) List some natural phenomena that you know.

3) What is the cause of lightning?

4) Explain why a charged body loses it's charge if we touch it.

5) Explain charging by rubbing.

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Class- VIII Subject- Chemistry


1 What is the composition of the head of a matchstick? Mention any three characteristics of a good fuel.

2 Why isn’t hydrogen gas used as a domestic or industrial fuel, although it has a very high calorific value? State three reasons for the answer.

3 Although wood has a very high calorific value, we still discourage its use as a fuel. Explain.

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Class- VIII Subject- Biology

Complete the following assignment questions 1) “The offsprings produced by asexual reproduction are referred to as clones”.

Why?

2) The term metamorphosis is not used while describing human development.

Why?

3) The eggs of frogs do not have shells for protection, yet they are safe in water.

How?

4) Although 2 cells called gametes fuse, the product formed is a single cell called

zygote. Justify.

5) Stages in the life cycle of silkworm are given below. Write them in sequential order. pupa, silkworm, egg, silkmoth

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Class- VIII Subject- History

Complete the following assignment questions 1. Why were people dissatisfied with British rule in the 1880s and 1880s? 2. Who were moderates? How did they propose to struggle against British rule? 3. How was the politics of within the congress different from that of the moderates? 4. How did the knowledge of ancient texts help the reformers promote new laws?

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Class- VIII Subject- Geography

Complete the following assignment questions ------------------------------------------------------------------------------- 1. On an outline map of India mark the major soil types of India. 2. On an outline map of India mark the Natural Vegetation of India. 3.Distinguish between coniferous forests and the desert forests. 4. Suggests measures of land and soil conservation. 5. Explain the factors controlling soil formation. 6. What are strip cropping and shelter belts? 7. What factors control the utilization of land? -----------------------------------------------------------------------------------

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Class- IX Subject- English


The Beggar

Extra Questions

1. What did Sergei expect the beggar to do when he called him while moving to another house? Did he behave as expected? 2. Mention two main qualities of the cook. 3. Discuss the title of the story. Is it appropriate? 4. Is Lushkoff a willing worker? Why does he agree to chop wood for Sergei? 5. Both Sergei and his cook were kind to the beggar. Compare and contrast their characters and the effect they had on Lushkoff.

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Class- IX Subject- Hindi


1) एक फूल क चाह इस क वता का क य भाव अपने श द म ल खए | 1) न न ल खत पंि तय का आशय प ट कर 1) अ व ांत बरसा करके भी, आंख त नक नह ं र ती 2)बुझी पड़ी थी चता वहां पर छाती धड़क उठ मेर

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Class- IX Subject- Marathi


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Class- IX Subject- Maths

Complete the following assignment questions 1.

2

3

4

5

6

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Class- IX Subject- Physics

Complete the following assignment questions 1) what is free fall?

2) What do you mean by freely falling bodies?

3) Define : Acceleration due to gravity.

4) Obtain formula for 'g'.

5) Write value of g for the earth.

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Class- IX Subject- Chemistry

Complete the following assignment questions 1 What is an ion? Give one example.

2What is wrong in saying ‘one mole of nitrogen’?

3 Calculate the mass of one atom of hydrogen atom.

4 Calculate the number of moles present in: (i) 3.011 × 1023 number of oxygen atoms. (it) 60 g of calcium(Atomic mass of Ca = 40 u)

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Class- IX Subject- Biology

Complete the following assignment questions 1) Name two structures found in plant cells but not in animal cells.

2) What is the outermost layer found in animal cells called?

3) Which organelle serves as a channel for transport of materials between cytoplasm and nucleus?

4) Where are proteins synthesized inside the cell?

5) How does an Amoeba obtain its food?

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Class- IX Subject- History

Complete the following assignment questions 1. What was guillotine? 2. Who was Napoleon Bonaparte? What reforms did he introduce in France? 3. Write about the political clubs formed in France. 4. Describe the circumstances leading to the outbreak of revolutionary protest in France. 5. Mention and describe the immediate cause of French revolution.

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Class- IX Subject- Geography

Complete the following assignment questions -------------------------------------------------------------------------------- 1. On an outline map of India mark the following. USE FIVE OUTLINE MAPS OF INDIA. Area of winter rainfall in India, Area of thorn forests, Highest rainfall region in India, Major Biosphere reserves in India, Major national parks in India, Major Wildlife sanctuaries in India, Major Bird Sanctuaries in India. -----------------------------------------------------------------------------------

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Class- X Subject- English

Complete the following assignment questions Q1-When the lawyer reached New Mullion, did ‘Bill’ know that he was looking for Lutkins? When do you think Bill came up with his plan for fooling the lawyer? Q2-Lutkins openly takes the lawyer all over the village. How is it that no one lets out the secret? (Hint: Notice that the hack driver asks the lawyer to keep out of sight behind him when they go into Fritz’s.) Can you find other such subtle ways in which Lutkins manipulates the tour? Q3- Why do you think Lutkins’ neighbours were anxious to meet the lawyer? Q4-After his first day’s experience with the hack driver the lawyer thinks of returning to New Mullion to practise law. Do you think he would have reconsidered this idea after his second visit? Q5- Do you think the lawyer was gullible? How could he have avoided being taken for a ride?

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Class- X Subject- Hindi

Complete the following assignment questions न न ल खत पंि तय का भाव प ट क िजए|

1) है टूट पड़ा भ ूपर अंबर 2) यो जलद यान म वचर- वचर था इं खेलता इं जाल|

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Class- X Subject- Marathi


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Class- X Subject- Maths


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Class- X Subject- Physics

Complete the following assignment questions 1) Define: Electric current.

2)Write formula for electric current.

3) Define the SI unit of electric current.

4) Name a device that measures electric current.

5) What do you mean by a circuit diagram?

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Class- X Subject- Chemistry

Complete the following assignment questions 1 What are the merits and demerits of Newland’s classification?

2 State two reasons for rejecting law of octaves.

3 Why do all the elements in a group of the Modern Periodic Table have similar chemical properties?

4 Name two elements whose properties were predicted on the basis of their positions in Mendeleev’s periodic table.

5 What is meant by a period in the periodic table?

6The two isotopes of chlorine have atomic mass 35.4 and 37.4. Should they be placed in separate slots in the modern periodic table?

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Class- X Subject- Biology

Complete the following assignment questions 1) What are the steps included in the elimination of wastes?

2) What are the important human excretory organs?

3) What is the human excretory system?

4) What are the important functions of the human excretory system?

5) What is the process of dialysis?

6) Why is excretion a vital process in the human body?

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Class- X Subject- History

Complete the following assignment questions 1 How could the influence of money be decreased in politics? 2. What are the various aspects of democratic government and politics? 3”Democracy does not ensure faster economic growth”. Explain. 4. Democray is based on dignity and freedom .Explain. 5.How can democracy be successful in bringing social harmony?

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Class- X Subject- Geography

Complete the following assignment questions -------------------------------------------------------------------------------- 1. On an outline map of India mark the following. USE FIVE OUTLINE MAPS OF INDIA. River valley Projects. Bhakra Nangal, Koyna Project, Hirakud, Tehri, Sardar Sarovar, Farakka, Chambal, Rihand, Tungabhadra, Nagarjuna Sagar, Beas, Jayalwadi, Almathy, Krishnarajsagar, Mittuer, Ranapratap Sagar. Major National Parks and Wildlife sanctuaries of India. Tea producing areas in India, Jute producing states, Coffee producing states, Cotton Producing states, Leading rubber producing states. Major iron ore mines in India. Mayurbanj, Bellary, Bailadila, Durg, Coal Mines and oil fields. Neyveli, Singareni, Talchar, Korba, Digboi, Ankaleshwar, Bassein and Mumbai High. -----------------------------------------------------------------------------------

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Class- XI Subject- English


Find from the lesson ‘Birth’ the words that mean the following : 1 a place where a doctor, dentist or other medical practitioner treats or advises patients

2 (a person) large and strong; heavily built

3 an old written form of the word ‘the’ 4 deep reflective thought 5 suddenly and unexpectedly 6 having or showing sensitive insight 7 lacking energy or enthusiasm 8 a strong feeling that something is about to happen, especially something unpleasant 9 (of a person) rather fat or heavy build 10 a person, typically a woman, who is trained to assist women in childbirth 11 used as a term of endearment, often after a personal name 12 smiling with less energy or a smile that lacks spirit 13 be constantly or visibly anxious; worry 14 in a state of anxiety; tired 15 manage to take (here) 16 strange; odd 17 lack of energy and enthusiasm 18 make a soft, muffled crackling sound 19 a small piece of partly burnt coal or wood that has stopped giving off flames but still has combustible matter in it 20 inquiring closely 21 not arranged in order; untidy 22 (with reference to a disturbing or unpleasant interest or activity) in an abnormal and unhealthy manner 23 meanly selfish, self-seeking

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24 (of a woman) bad-tempered or aggressively assertive 25 causing a mood of gloom or depression 26 make a slight involuntary grimace or shrinking movement of the body out of pain or distress 27 like an idyll; extremely happy, peaceful, or picturesque 28 feeling or expressing bitterness or indignation at having been treated unfairly 29 preoccupied with depressing, morbid, or painful memories or thoughts 30- a screen for a window, especially one on a roller or made of slats 31- revive someone from the unconsciousness 32 used as an anaesthetic 33 excessive speed or urgency of movement or action; hurry 34 conducted in a hurried, excited, and disorganized way 35- (of an emotion or quality) gradually decrease 36- relating to the region immediately beneath the skin 37- generous 38- lifeless 39- saturated with liquid, especially water; soaked through 40- the hard fat of animals melted and used to make soap, candles etc. 41- with excessive speed or urgency; hurriedly 42- slit 43- hang loosely 44- looking exhausted and unwell, especially from fatigue, worry, or suffering 45- a condition arising when the body is deprived of oxygen, causing unconsciousness or death; suffocation 46 - suffocation or unconscious condition caused by lack of oxygen and excess of carbon dioxide in the blood, accompanied by paleness of the skin, weak pulse, and loss of reflexes 47 lose strength or momentum 48 (of a person's face) pale, typically because of poor health 49- a large jug with a wide mouth, formerly used for carrying water 50- falling steeply

51- complete 52 a feeling of anxiety or dismay, typically at something unexcited 53- dirty or wet, typically from being trailed through mud or water 54- tripping or losing balance while walking; moving with difficulty 55 saturated with liquid; wet through

56- say something in a low, feeble voice that expresses fear, pain, or unhappiness 57- little (here) 58- violent; uncontrollable 59- produce a sigh 60- weak 61- achieving little 62- showing luminous colours that seem to change when seen from different angles 63- a small kitchen or room at the back of a house used for washing dishes and other dirty household work


Class- XI Subject- Maths

Complete the following assignment questions. 1. A marketing firm determined that, of 200 households surveyed, 80 used neither

Brand A nor Brand B soap, 60 used only Brand A soap, and for every household that

used both brands of soap, 3 used only Brand B soap. How many of the 200

households surveyed used both brands of soap?

2. There are 230 students. 80 play football, 42 play soccer and 12 play rugby. 32 play

exactly 2 sports and 4 play all three. How many students play none?

3. In a competition, a school awarded medals in different categories, 36 medals in

dance, 12 medals in dramatics and 18 in music. If these medals went to a total of 45

students and only 4 students got medals in all the three categories, how many did

receive medals in exactly two of the categories?

4. In a class 40% of the students enrolled for Math and 70% enrolled for Economics. If

15% of the students enrolled for both Math and Economics, what % of the students of

the class did not enroll for either of the two subjects?

5. In a class of 120 students numbered 1 to 120, all even numbered students opt for

Physics, those whose numbers are divisible by 5 opt for Chemistry and those whose

numbers are divisible by 7 opt for Math. How many opt for none of the three

subjects?

6. In a room containing 28 people, there are 18 people who speak English, 15 people

who speak Hindi and 22 people who speak Kannada, 9 persons speak both English

and Hindi, 11 persons speak both Hindi and Kannada where as 13 person speak

both Kannada and English. How many people speak all the three languages?

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7. What is the number of elements in the power set of the set {{a, b}, c}? List all the

subsets.

8. How many chords can be drawn, through 23 points on a circle?

9. In how many different ways can the letters of the word ‘HEXAGON’ be permuted?

10. In how many different ways can a team of 3 boys and 3 girls be selected from 5

boys and 4 girls?

11. How many 4 digit numbers are there with no digit repeated?

12. Consider all the letters of the word ‘FAILURE’. i) How many words can be formed using these letters? ii) How many words can be formed so that the vowels being together? iii) How many words begin with A and end with E?

13. How many words, with or without meaning, can be formed using all the letters of the

word ‘CHEMISTRY’, using each letter exactly once? How many of them start with C

and end with Y?

14. What is the total number of ways of choosing 4 cards from a pack of 52 playing

cards? In how many of these four cards of the same suit?

15. Find the number of permutation of the letters of the word ‘ALLAHABAD’. 16. If the letters of the word ‘TUTOR’ be permuted among themselves and arranged as

in a dictionary, then find the position of the word ‘TUTOR’.

17. Given sum of three consecutive terms in an AP is 21 and their product is 280. i) Find the middle term of the above terms. ii) Find the remaining two terms of the above AP.

18. Insert three numbers between 1 and 256 so that the resulting sequence is a GP.


Class- XI Subject- Physics

Complete the following assignment questions Question 1. Directions: The following question has four choices out of which ONLY ONE is correct. A thermodynamical system is changed from state (P1, V1) to (P², V²) by two different processes, the quantity which will remain same is: (a) ΔQ (b) ΔW (c) ΔQ + ΔW (d) ΔQ – ΔW

Question 2. The temperatures of inside and outside of a refrigerator are 273 K and 303 K respectively. Assuming, that the refrigerator cycle is reversible, for every joule of work done, the heat delivered to the surrounding will be nearly: (a) 10 J (b) 20 J (c) 30 J (d) 50 J

Question 3. An engine has an efficiency of 1/6. When the temperature of sink is reduced by 62°C, its efficiency is doubled. Temperature of the source is: (a) 124°C (b) 37°C (c) 62°C (d) 99°C

Question 4. A black body at a temperature of 227°C radiates heat at the rate of 20 cal m-2s-1. When its temperature rises to 727°C, the heat radiated will be (a) 40 units (b) 160 units (c) 320 units (d) 640 units

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Question 5. Directions: The following question has four choices out of which ONLY ONE is correct. Which of the following is incorrect regarding the first law of thermodynamics? A. It is not applicable to any cyclic process B. It is a restatement of the principle of conservation of energy C. It introduces the concept of the internal energy D. It introduces the concept of the entropy (a) A and D (b) B and C (c) C and A (d) A and B

Question 6. At a given volume and temperature, the pressure of a gas (a) varies inversely as its mass (b) varies inversely as the square of its mass (c) varies linearly as its mass (d) is independent of its mass

Question 7. Directions: The following question has four choices out of which ONLY ONE is correct. In a thermodynamic process, pressure of a fixed mass of the gas is changed in such a manner that the gas molecules give out 30 J of heat. Also, 10 J of work is done on the gas. If the internal energy of the gas was 40 J, what will be the final internal energy? (a) 20 J (b) -20 J (c) 80 J (d) zero

Question 8. The translational kinetic energy of gas molecules at temperature T for one mole of a gas is (a) (3/2) RT (b) (9/2) RT (c) (1/3) RT (d) (5/2) RT

Question 9. Which of the following parameters dose not characterize the thermodynamic state of matter? (a) work

(b) volume (c) pressure (d) Temperature

Question 10. Directions: The following question has four choices out of which ONLY ONE is correct. A Carnots engine works as a refrigerator between 250 K and 300 K. If it receives 750 calories of heat from the reservoir at the lower temperature, the amount of heat rejected at the higher temperature is __________. (a) 900 cal (b) 625 cal (c) 750 cal (d) 1000 cal


Class- XI Subject- Chemistry


1. Do you expect the carbon hydride of type Cn H2n+2 to act as ‘Lewis’ acid or base? Justify your answer.

2. Saline hydrides are known to react with water violently producing fire. Can C02, a well known fire extinguisher, be used in this case? Explain.

3. Arrange the following: (i) CaH2, BeH2 and TiH2 in order of increasing electrical conductance. (ii) LiH, NaH and CsH in order of increasing ionic character. (iii) H-H, D—D and F—F in order of increasing bond dissociation enthalpy. (iv) NaH, MgH2 and H2O in order of increasing reducing property.

4. Complete the following chemical reactions. (i) PbS(s) + H2O2 (aq) ————-> (ii) MnO4– (aq) + H2O2 (aq) ————-> (iii) CaO(s) + H2O(g) ————-> (iv) AlCl3(g) + H2O(l)————-> (v) Ca3N2(S) + H2O(l) ————->

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Class- XI Subject- Biology


1. Calcium ion concentration in blood affects muscle contraction. Does it lead to tetany in

certain cases? How will you correlate fluctuation in blood calcium with tetany? 2. An elderly woman slipped in the bathroom and had severe pain in her lower back. After

X-ray examination doctors told her it is due to a slipped disc. What does that mean? How does it affect our health

3. Explain sliding filament theory of muscle contraction with neat sketches. 4. How does a muscle shorten during its contraction and return to its original form during

relaxation? 5. Discuss the role of Ca2+ ions in muscle contraction. Draw neat sketches to illustrate your

answer. 6. Differentiate between Pectoral and Pelvic girdle.

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Class- XI Subject- Computer

Complete the following assignment questions Explain general precautions to be observed while surfing the net Explain concept of cloud computing in details Explain concept of copyright

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Class- XII Subject- English

Complete the following assignment questions Q.1 Name the figure of speech for the following expressions: 1.What a Thunderclap.. 2.Looked Like Little Flags. 3.As If They Had the Key to Their Prison.. 4.Unnecessary Dread.. 5.Books Become Old Friends .. 6.Benches Worn Smooth .. 7.Sound of Pens Scratching Paper .. Q.2 Answer the following questions in about 120 -130 words 1. What is the significance of the historical context in which "The Last

Lesson" is set? 2. How does the idiom "you don't know what you have until it's gone" apply

to "The Last Lesson"? 3. What is the significance of Monsieur Hamel's garden?

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Class- XII Subject- Maths

Complete the following assignment questions. 1. Functions f ,g :R →R are defined, respectively, by f(x) = x2 + 3x +1, g(x) = 2x − 3, find (i) fog (ii) gof (iii) fof (iv) gog 2. Find the value of :

3. Find x, y and z, if the following matrix A satisfies A’ = A-1

4. Express the given matrix as the sum of a symmetric and a skew-symmetric

Matrix:

5. Using vectors, find the area of the △ABC with vertices A(1, 2, 3),B(2,–1,4) and C(4, 5, –1).

6. Find the equation of the plane which is perpendicular to the plane 5x + 3y +6z + 8 = 0 and contains the line of intersection of the planes

x + 2y + 3z - 4 = 0 and 2x + y - z+ 5 = 0.

7. Solve the following problem graphically: Minimise and Maximise Z = 3x + 9y,

subject to the constraints:

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x + 3y ≤ 60, x + y ≥ 10, x ≤ y, x ≥ 0, y ≥ 0


Class- XII Subject- Physics

Complete the following assignment questions 1. If 13.6 eV energy is required to ionise the hydrogen atom, then energy required to remove an electron from n = 2 is (a) 10.2 eV (b) 0 eV (c) 3.4 eV (d) 6.8 eV.

2. In Bohr’s model of an atom which of the following is an integral multiple of h2π? (a) Kinetic energy (b) Radius of an atom (c) Potential energy (d) Angular momentum

3. In Bohr’s model, the atomic radius of the first orbit is rQ. Then, the radius of the third orbit is (a) r0/9 (b) r0 (c) 9r0 (d) 3r0

4. The K.E. of the electron in an orbit of radius r in hydrogen atom is proportional to

5. The ratio between Bohr radii is (a) 1 : 2 : 3 (b) 2 : 4 : 6 (c) 1 : 4 : 9 (d) 1 : 3 : 5

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6. The longest wavelength in Balmer series of hydrogen spectrum will be (a) 6557 Å (b) 1216 Å (c) 4800 Å (d) 5600 Å

7. In terms of Rydberg constant R, the wave number of the first Balmer line is (a) R (b) 3R (c) 5R36 (d) 8R9

8. The ionisation energy of hydrogen atom is 13.6 eV. Following Bohr’s theory the energy corresponding to a transition between 3rd and 4th orbits is (a) 3.40 eV (b) 1.51 eV (c) 0.85 eV (d) 0.66 eV

9. The energy of hydrogen atom in the nth orbit is En, then the energy in the nth orbit of single ionised helium atom is

10. On moving up in the energy states of a H-like atom, the energy difference between two consecutive energy states (a) decreases. (b) increases. (c) first decreases then increases. (d) first increases then decreases.

11. The transition of electron from n = 4, 5, 6, ………. to n = 3 corresponds to (a) Lyman series

(b) Balmer series (c) Paschen series (d) Brackettseries

12. As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of double ionized Li atom (Z = 3) is (a) 1.51 eV (b) 13.6 eV (c) 40.8 eV (d) 122.4 eV


Class- XII Subject- Chemistry


1. (i) E° value for the Mn+3/Mn+2 couple is positive (+1.5 V) whereas that of Cr+3/Cr+2 is negative (-0.4 V). Why? ‘ (ii) Transition metals form coloured compounds. Why? (iii) Complete the following equation:

2. Why is zinc not regarded as a transition element?

3. Copper atom has completely filled d-orbitals in its ground state but it is a transition element. Why?

4. Zn+2 salts are white while Cu+2 salts are coloured. Why?

5. Why dp transition elements show variable oxidation states? In 3d

series (Sc to Zn), which element shows the maximum number of oxidation states and why?

6. (i) MnO is basic whereas Mn207 is acidic in nature. Why?

(ii) Transition metals form alloys. Why? (iii) Complete the following equation: 2MnO4 + 4KOH + O2 ———>

WEEKLY ASSIGNMENT


Class- XII Subject- Biology


1. Answer the following with respect to Cancer.

(a) How does a cancerous cell differ from a normal cell?

(b) Benign tumor is less dangerous than malignant tumor. Why?

(c) Describe causes of cancer.

(d) Mention two methods of treatment of the disease.

2.The pathogen of a disease depends on RBCs of human for growth and

reproduction. The person with this pathogen suffers with chill and high fever.

(a) Identify the disease.

(b) Name the pathogen.

(c) What is the cause of fever?

(d) Represent the life cycle of the pathogen diagrammatically.

WEEKLY ASSIGNMENT

3.The immune system of a person is suppressed. He was found positive for a

pathogen in the diagnostic test ELISA.

(a) Name the disease, the patient is suffering from.

(b) Which pathogen is identified by ELISA test?

(c) Which cells of the body are attacked by the pathogen?

(d) Suggest preventive measure of the infection.

4. Discuss the role of lymphoid organs in the immune response. Explain the different types of lymphoid organs giving two examples of each type in humans. 5. What is somatic hybridization – Explain the steps involved in the production of somatic hybrids?


Class- XII Subject- Computer

Complete the following assignment questions Explain recursion with example Explain concept of linking SQL and python with example Explain difference between DDL and DML and wit example commands

WEEKLY ASSIGNMENT

weekly assignmentmonth- december week – 5 class- vii subject- geography complete the following...

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