Class X Holidays Homework Session 2019 - 20

ENGLISH

Note: Attempt grammar questions in the worksheet itself and paste it in your notebook. 1. Read any one of the following books and write the book review on A4 size sheets (It should have cover page, theme, list of characters, storyline along with pictures) a. Heart of Darkness by Joseph Conard b. The Last Lecture by Randy Pausch c. A Mighty Heart by Mariane Pearl d. I Know Why the Caged Bird Sings by Maya Angelou e. The Room on the Roof by Ruskin Bond 2. Integrated Grammar Practice Worksheet (Please find the attachment below) 3. Write an article on any two of the following topics in 150-175 words in English notebook: a. Terrorism b. Poverty c. Importance of Education d. Plant Green, Donate Red, Save Blue e. Health is Wealth 4. Weave a story using any ten of the following words (Word Limit- 150 words) in English notebook:

Catastrophe Remorseful Equality

Zeal Endeavour Trodden

Determined Discern Definitely

Ecstasy Repent Perseverance

Gullible Obstacles Optimistic

INTEGRATED GRAMMAR PRACTICE WORKSHEET 1. Rearrange the following words to frame meaningful sentences: 1. dog / Rahul / with / his / pet / playing / enjoys. Ans. 2. to / the / company / goods / Vietnam / exports.

Ans.

3. she / interested / that / was / in / proposal / said / she / the.

Ans.

4. was / performance / impressed / with / quite / his

Ans.

5. the / please / not / do / on / grass / step.

Ans.

6. every / delicious / father / cooks / evening / pasta.

Ans.

7. brother / an / wants / be / my / astronaut / to.

Ans.

8. everything / will / sense / make / perfect / someday.

Ans.

9. at / top / voice,/ the / man / his / of / demanded / the / admission / shouting.

Ans.

10. you / where / have / this / all / while / been?

Ans.

11. should / you / have / coming / seen / this.

Ans.

12. effect / we / in / did / much / sales / last / not / year / improvement.

Ans.

2. Fill in the blanks with suitable word from the bracket:

Sujata Ashtekar and Vatsala Trivedi are two women ………… (on / in / with / at) a mission. They spend their time and energy to popularize organ donation in Mumbai. Ashtekar and Trivedi are volunteers ………….. (at / with / in) the Zonal Transplant Coordination Committee that ……………. (coordinates / coordinate / coordinating / coordinated), monitors and supervises the cadaver organ transplant programme ……………. (along / through / across) Mumbai.

Both Trivedi and Ashteakr come ……….. (off / from / on) the medical sector. Trivedi, 60, retired as the urology and transplant department head of Sion hospital. ……………. (In / During / For) her career that spanned ……….. (over / above / more) 20 years she realized the importance of transplants. She also did Mumbai’s first kidney transplant ………….. (in / on / at) 21 March, 1997. Ashtekar is a Master ………… (in / of / for) Social Sciences from TISS. She learnt the basics …………. (for / of / in) organ transplantation after a stint at Jaslok hospital. They formed the ZTCC (Zonal Transplant Coordination Committee) with likeminded people ……….. (in / on / at) December 2000.

3. Edit the following passages:

Vitamin tablets has been around forever, but antioxidants are the a) …………………….

the last miracle cure. Do they really work? b) …………………….

If the hype is true, then that the antioxidants do is c) …………………….

work for neutralise the free radicals in our bodies d) …………………….

and latter excrete them. Free radicals are atoms or molecules e) …………………..

that have at least one unpaired electron and is therefore f) ……………………

unstable and highly reactive. In animal tissue they are believing to accelerate the

g) ……………………

progression of cardiovascular and age-related diseases as dementia and cancer.

h) …………………..

The use for bottled supplements with your diet is a practice a) ……………………

that need to be discouraged. It is also essential to keep abreast b) …………………..

off new developments in research. Ironically those health-conscious individuals

c) …………………….

who already eats large quantities of fresh fruit and vegetables, d) …………………….

who diet does not include junk food and who get plenty of regular e) …………………….

exercise and have least need for dietary supplements tend to be the ones f) ………………………

whom are most likely to use them. g) …………………….

4. In the following passages, one word has been omitted in each time. Write the missing word along with the word that comes before and the ward that comes after it in the space provided against the correct blank number. Ensure that the word that forms your answer is underlined.

Rocks at bottom of the sea a)

do not contain dinosaur

fossils they were land animals. b)

They mostly found in the rock c)

layers at the bottom swamps, d)

lakes or rivers. Many theories

try explain the death of the e)

dinosaurs. Some are unlikely f)

than the others. Many people believe

that they became extinct of change g)

in world climate.

HINDI

* परियोजना कायय

अडंमान -ननकोबाि की भोगोलिक स्थिनि ,खान -पान ,व्यवसाय ,वेशभषूा ,सेििुि जेि को ध्यान में िखि ेहुए परियोजना ियैाि कीस्जए |

*अधिकायय ,सचूना िेखन,पत्र िेखन ििा समास हहदंी काययपसु्थिका में ही किना है |

कबीि

प्रश्न 1 साखी से आप क्या समझि ेहैं ? 2 कबीि के अनसुाि मैं औि हरि में क्या वविोि है ? 3 कबीि के अनसुाि ,ननदंा क्यों उपयोगी है ? 4 कबीि के अनसुाि ककस दीपक को देख कि मन का अिेँिा दिू हो जािा है ? 5 कबीि ने सच्चा भक्ि ककस ेकहा है ? 6 पोिी पढ़ -पढ़कि भी ज्ञान न होने से कबीि का क्या िात्पयय है ? 7 `इश्वि कण -कण में व्याप्ि है “किि भी हम उसको क्यों नहीं देख पाि े? 8 मन का आपा खोने का क्या आशय है ? 9 कबीि की साखखयों का प्रनिपाद्य क्या हैं ?

मीिा

1 मीिा ने अपने पदों में प्रभ ुको क्या -क्या नाम हदए हैं ? 2 मीिाबाई कौन -कौन से िकय देकि श्री कृष्ण से दशयन देने की प्राियना कि िही है ? 3 कृष्ण की चाकिी किने से मीिा को कौन कौन से िीन िाभ होंगें ? 4 मीिा ऊंच े-ऊँचे महिों औि बीच -बीच में खखडककयों की काल्पना क्यों कििी है ?

अिवा मीिा में कृष्ण के दशयन पाने के लिए ककस यसु्क्ि का सहािा लिया ?

5 मीिा यमनुा िट पि आिी िाि में श्री कृष्ण दशयन क्यों किना चाहिी हैं ? 6 मीिाबाई के काव्य में वविह की अनभुनूि अपनी चिम सीमा पि हैं ---थपष्ट कीस्जए |

बड़ ेभाई साहब

1 बड़ ेभाई साहब का चरित्र -धचत्रण कीस्जए | 2 छोटे भाई की चारित्रत्रक ववशषेिाएं क्या िी ? 3 बड़ ेभाई के अनसुाि जीवन की समझ ककिाबी ज्ञान से आिी है या अनभुव से |आप अपने ववचाि प्रथििु कीस्जए |

डायिी का एक पन्ना

1 `डायिी का एक पन्ना `पढ़कि हमािे मन में देशभस्क्ि की क्या प्रेिणा लमििी है ? 2 िमयिल्ि ेपि आकि जुिसू क्यों टूट गया ? 3 पलुिस कलमश्नि के नोहटस औि कोंलसि के नॉहटस में क्या अिंि िा ? 4 सभुाष बाब ूके जुिसू में थत्री समाज की क्या भलूमका िी ? 5 खुिा चैिेंज दे कि ऐसी सभा पहि ेनहीं हुई िी ----आशय थपष्ट कीस्जए | 6 डायिी का एक पन्ना `पाठ का प्रनिपाद्य अपने शब्दों में लिखो |

सचूना िखेन --

1 ववद्यािय के साहहस्त्यक क्िब के सधचव के रूप में `प्राचीि `पत्रत्रका के लिए िखे ,कवविा ,ननबिं ,आहद ववद्याधिययों द्वािा प्रथििु किने हेि ुसचूना पट्ट के लिए एक सचूना िगभग 30 शब्दों में लिखखए |

2 आदशय बालिका ववद्यािय में ग्रीष्मावकाश में योग कक्षाओं का आयोजन के लिए सचूनापट्ट के लिए एक सचूना िगभग 30 शब्दों में लिखखए |

3 कि चुनाव के कािण ववद्यािय में अवकाश िहेगा इसकी जानकािी के लिए िगभग 30 शब्दों में सचूना लिखखए | 4 आपका ववद्यािय खिेकूद प्रनियोधगिा आयोस्जि कि िहा है |ववद्यािी सघं के सधचव की हैलसयि से सचूना

पट्ट के लिए एक सचूना लिखखए | 5 सवोदय ववद्यािय के प्रिानाचायाय की ओि से ववद्यािय में हो िहे वन महोत्सव की जानकािी देि ेहुए एक

सचूना लिखखए | पत्र --िेखन

1 महानगिों में महहिाओ ंकी सिुक्षा के ववषय में समाचाि पत्र के सपंादक को पत्र लिखखए | 2 चैक बकु खो जाने पि बैंक प्रबिंक को सचूना देि ेहुए पत्र लिखखए | 3 आपका त्रबजिी का मीटि ख़िाब पड़ा है औि किि भी उसका त्रबि आया है ,इसी समथया के सम्बन्ि में अपने क्षेत्र

के त्रबजिी अधिकािी को पत्र लिखखए | 4 ववद्यािय के गेट पि ठेि ेया िेहड़ी वािों द्वािा जकं फ़ूड बचेे जाने की लशकायि किि ेहुए प्रिानाचायय को पत्र

लिखखए | 5 डेंग ू,मिेरिया अधिकािी को अपने क्षते्र में बढ़ि ेप्रकोप पि उधचि काययवाही किने के लिए पत्र लिखखए |

MATHEMATICS

ASSIGNMENT -1 (REAL NUMBERS) 1. Find the HCF of 52 and 117 and express it in form 52x + 117y. 2. Prove that x2 – x is divisible by 2 for all positive integer x. 3. If m and n are odd positive integers, then m2 + n2 is even, but not divisible by 4. Justify. 4. If HCF (6, a) = 2 and LCM (6, a) = 60, then find a.

5. If remainder of is a natural number, then find it. 6. If n is any prime number and a2 is divisible by n, then n will also divide a. Justify. 7. Find the missing numbers in prime factors tree.

8. Find the greatest number of 5 digits exactly divisible by 12, 15 and 36. 9. Find the smallest number which when increased by 20 is exactly divisible by 90 and 144. 10. Find the smallest number which leaves remainder 8 and 12 when divided by 28 and 32 respectively. 11. Floor of a room is to be fitted with square marble tiles of the largest possible size. The size of the room is 10 m × 7 m. What should be the size of tiles required that has to be cut and how many such tiles are required? 12. If the HCF of 408 and 1032 is expressible in the form 1032p – 408 × 5 find p. ANSWERS:

1. The decimal expansion of number has: (a) a terminating decimal (b) non-terminating but repeating

(c) non-terminating non repeating (d) terminating after two places of decimal 2. The values of x and y in the given figure are:

(a) x = 10; y = 14 (b) x = 21; y = 84 (c) x = 21; y = 25 (d) x = 10; y = 40 3. For any positive integer a and 3, there exist unique integers q and r such that a = 3q + r, where r must satisfy : (a) 0 ≤ r < 3 (b) 1 < r < 3 (c) 0 < r < 3 (d) 0 < r ≤ 3

4. is: (a) a rational number (b) an irrational number (c) a prime number (d) an even number 5. L.C.M. of 23 × 32 and 22 × 33 is : (a) 23 (b) 33 (c) 23 × 33 (d) 22 × 32 6. The HCF and LCM of two numbers are 33 and 264 respectively. When the first number is completely divided by 2 the quotient is 33. The other number is: (a) 66 (b) 130 (c) 132 (d) 196 7. What will be the least possible number of the planks, if three pieces of timber 42 m, 49 m and 63 m long have to be divided into planks of the same length? (a) 5 (b) 6 (c) 7 (d) none of these 8. What is the greatest possible speed at which a man can walk 52 km and 91 km in an exact number of minutes? (a) 17 m/min (b) 7 m/min (c) 13 m/min (d) 26 m/min

9. If A = 2n + 13, B = n + 7, where n is a natural number then HCF of A and B is: (a) 2 (b) 1 (c) 3 (d) 4 10. Pairs of natural numbers whose least common multiple is 78 and the greatest common divisor is 13 are: (a) 58 and 13 or 16 and 29 (b) 68 and 23 or 36 and 49 (c) 18 and 73 or 56 and 93 (d) 78 and 13 or 26 and 39 11. Two natural numbers whose sum is 85 and the least common multiple is 102 are: (a) 30 and 55 (b) 17 and 68 (c) 35 and 55 (d) 51 and 34 12. 4 Bells toll together at 9.00 am. They toll after 7, 8, 11 and 12 seconds respectively. How many times will they toll together again in the next 3 hours? (a) 3 (b) 4 (c) 5 (d) 6 13. A forester wants to plant 66 apple trees, 88 banana trees and 110 mango trees in equal rows (in terms of number of trees). Also he wants to make distinct rows of trees (i.e., only one type of trees in one row). The number of minimum rows required are (a) 2 (b) 3 (c) 10 (d) 12 14. A number 10x + y is multiplied by another number 10a + b and the result comes as 100p + 10q +r, where r = 2y, q = 2(x + y) and p = 2x; x, y < 5, q ≠ 0. The value of 10a + b may be: (a) 11 (b) 13 (c) 31 (d) 22 15. If the HCF of 65 and 117 is expressible in the form 65m – 117, then the value of m is (a) 4 (b) 2 (c) 1 (d) 3 16. The largest number which divides 70 and 125, leaving remainders 5 and 8 respectively, is (a) 13 (b) 65 (c) 875 (d) 1750

17. If two positive integers a and b are written as a = x3y2 and b = xy3; x, y are prime numbers, then HCF (a, b) is (a) xy (b) xy2 (c) x3y3 (d) x2y2 18. If two positive integers p and q can be expressed as p = ab2 and q = a3b; a, b being prime numbers, then LCM (p, q) is (a) ab (b) a2b2 (c) a3b2 (d) a3b3 19. The least number that is divisible by all the numbers from 1 to 10 (both inclusive) is (a) 10 (b) 100 (c) 504 (d) 2520

20. The decimal expansion of the rational number will terminate after (a) one decimal place (b) two decimal places (c) three decimal places (d) four decimal places ASSIGNMENT -2(Polynomials) 1. If one zero of the polynomial 5z2 + 13z – p is reciprocal of the other, then find p. 2. If the product of two zeroes of polynomial 2x3 + 3x2 – 5x – 6 is 3, then find its third zero. 3. Find the polynomial of least degree which should be subtracted from the polynomial x4 + 2x3 – 4x2 + 6x – 3 so that it is exactly divisible by x2 – x + 1. 4. Is polynomial y4 + 4y2 + 5 have zeroes or not?

5. Write a quadratic polynomial, sum of whose zeroes is and product is 5. 6. Write the zeroes of the polynomial x2 + 2x + 1. 7. If the zeroes of the polynomial f(x) = x3 – 12x2 + 39x + a are in AP, find the value of a. 8. A polynomial g(x) of degree zero is added to the polynomial 2x3 + 5x2 – 14x + 10 so that it becomes exactly divisible by 2x – 3. Find the g(x). 9. Find the zeroes of the quadratic polynomial x2 + 5x + 6 and verify the relationship between the zeroes and the coefficients. 10. If the zeroes of polynomial x3 – ax2 + bx – c are in AP then show that 2a3 – 9ab + 27c = 0 11. If 1 and –1 are zeroes of polynomial Lx4 + Mx3 + Nx2 + Rx + P, show that L + N + P = M + R = 0 12. Draw graph of the function f(x) = –2x2 + 4x.

13. If x + a is a factor of the polynomial x2 + px + q and x2 + mx + n prove that 14. Find a cubic polynomial with the sum, sum of the product of its zeroes taken two at a time and

product of its zeroes are respectively.

15. Write cubic polynomial whose zeroes are 16. α, β, γ are zeroes of cubic polynomial kx3 – 5x + 9. If α3 + β3 + γ3 = 27, find the value of k. 17. α, β, γ are zeroes of cubic polynomial x3 – 12x2 + 44x + c. If α, β, γ are in AP, find the value of c.

18. Two zeroes of cubic polynomial ax3 + 3x2 – bx – 6 are –1 and –2. Find the third zero and value of a and b. 19. α, β, γ are zeroes of cubic polynomial x3 – 2x2 + qx – r. If α + β = 0 then show that 2q = r. 20. α, β, γ are zeroes of polynomial x3 + px2 + qx + 2 such that α. β + 1 = 0. Find the value of 2p + q + 5. ASSIGNMENT-3(Linear Equation in two variables) 1. For what values of a and b does the following pair of equations have an infinite numbers of solutions. 2x+3y=7, a(x+y)-b(x-y)=3a+b-2 2. For what value of k will the following equations have infinitely many solutions? 2x-3y=7, (k+1) x+ (1-2k) y=5k-4 3. The sum of denominator and numerator of a fraction is 3 less than twice the denominator. If each of the numerator and denominator is denominator is decreased by 1, the fraction becomes 1/2. Find the fraction. 4. The sum of the digits of a two digit number is 12. The number obtained by interchanging the two digits exceeds the given number by 18. Find the number. 5. The sum of the numerator and denominator of a fraction is 12. If 1 is added to both numerator and

denominator the fraction becomes �. Find the fraction. 6. 4 men and 6 boys can finish a piece of work in 5 days while 3 men and 4 boys can finish it in 7 days. Find the time taken by 1 man alone or than by 1 boy alone. 7. A man travels 600km apart by train and partly by car. It takes 8 hours and 40 minutes if he travels 320 km by train and rest by car. It would take 30 minutes more if he travels 200 km by train and the rest by the car/. Find the speed of the train and by car separately. 8. Solve the equations graphically. 2x+y=2 , 2y-x=4. Also find the area of a triangle formed by the two lines and the line y=0. 9. For what value of k will pair of equations have no solution? 3x+y=1 , (2k-1)x+(k-1)y=2k+1 10. Solve the following pair of equations graphically. x+3y=6, 2x-3y=12. Also find the area of the triangle formed by the lines representing the given equations with y-axis. NOTE: Do the assignments in your classwork notebook.

SCIENCE

Important Instructions:

Attempt both sets (A and B) of month end assessment in Science notebook. Question paper is uploaded on entab.

Attempt the worksheet given below in notebook.

Prepare chapter Chemical reactions, Acids, bases and salts, Periodic classification of elements for pre midterm examination.

WORKSHEET

1. Choose the correct alternative:

a. Which of the following is not a chemical Reaction? (i) Formation of salt solution (ii) Milk turns sour in hot weather (iii) Burning of matchstick (iv) Contamination of food

b. A Chemical equation should be balanced to (i) Display conservation of energy (ii) Display conservation of mass

(iii) To make equation attractive (iv) All the above

c. A chemical equation is said to be balanced if number of (i) Compounds are same in both side (ii) Molecules are same in both side (iii) Number of atoms is same in both side (iv) Number of electrons are same in both side

d. Write values of a, b and c so that following chemical equation is balanced a H2 + b O2 → c H2O (i) a=2,b=1,c=2 (ii) a=1,b=1,c=2 (iii) a=1,b=2,c=1 (iv) a=2,b=2,c=1

e. Which of the following indicator cannot be used to indicate acid? i)Blue litmus ii)Clove oil iii)Methyl orange iv)Vinegar

f. Amount of Hydrochloric Acid (HCl) secreted daily by gastric glands is

i) 1 lit

ii)3 lit

iii)2 lit

iv)4 lit

g. The function of quick lime in soda lime mixture is to

(i) Absorb moisture present in soda lime

(ii) Increase the efficiency of soda lime

(iii) Increase the pH of soda lime

(iv) Take part in reaction with NaOH

h. The difference of molecules of water in gypsum and Plaster of Paris is

(i)5/2 (ii) 2b (iii) 3/2 (iv) ½

i. The chemical formula of caustic potash is

(i) NaOH (ii) Ca(OH)2 (iii) NH4OH (iv) KOH

j. Which of the following statements is not a correct statement about the trends when going

from left to right across the periods of periodic Table.

(i) The elements become less metallic in nature.

(ii) The number of valence electrons increases.

(iii) The atoms lose their electrons more easily.

(iv) The oxides become more acidic.

k. Modern periodic table is based on _______.

(i) atomic mass

(ii) mass number

(iii) atomic number

(iv) atomic volume

2. Answer the following questions: (Basic Level)

a. X and Y are two elements having similar properties and obey Newland’s law of octaves. How many elements are there in between X and Y?

b. State two reasons for rejecting law of octaves.

c. Define electron affinity and electronegativity.

d. Why sodium and chlorine lie in the same period of the modern periodic table?

e. Why photosynthesis is considered an endothermic reaction?

f. Write the chemical equation for the reaction that takes place when solutions of lead nitrate and potassium iodide are mixed.

g. Why does the colour of copper sulphate solution change when iron nail is dipped in it? Write the reaction involved.

h. A student prepares aqueous solutions of the following salts: Copper sulphate, sodium sulphate, ferrous sulphate and barium chloride. Write the colour of each solution thus formed.

i. Name a salt which does not contain water of crystallization.

j. Name three products of chlor- alkali process. Write one commercial use of each.

k. Why HCl is a strong acid?

l. Why rain water conducts electricity and distilled water does not?

3. Answer the following questions: (Intermediate and Advanced level)

a. A white coloured powder is used by doctors for supporting fractured bones.

i. Write chemical name and formula of the powder.

ii. When this white powder is mixed with water a hard solid mass is obtained. Write balanced chemical equation for the change.

b. Explain the action of dilute hydrochloric acid on the following with chemical equation:

i.Magnesium ribbon (ii) Sodium hydroxide (iii) Crushed egg shells

c. Write the chemical formula of hydrated copper sulphate and anhydrous copper sulphate. Giving an activity illustrate how these are inter convertible.

d. Write the name given to bases that are highly soluble in water. Give an example.

i. How is tooth decay related to pH? How can it be prevented? ii. Why does bee sting cause pain and irritation? Rubbing of baking soda on the sting area gives

relief. How?

e. (i) Identify the acid and the base whose combination forms the common salt that you use in your food. Write its formula and chemical name of this salt. Name the source from where it is obtained.

ii) What is rock salt? Mention its colour and the reason due to which it has this colour.

iii) What happens when electricity is passed through brine? Write the chemical equation for it.

f. An element 'M' has atomic number 11. (i) Write its electronic configuration. (ii) State the group to which 'M' belongs. (iii) Is 'M' a metal or a non-metal? (iv) Write the formula of its chloride.

g. Answer the following

i)Why is potassium more reactive than lithium?

ii) Why fluorine is more reactive than chlorine?

iii) Which is smaller in size Cl or Ar?

iv) Which is smaller in size Li or F ?

v) Which is more electronegative F or Cl?

h. Name the following –

Two elements that have a single electron in their outermost shells.

Two elements that have two electrons in their outermost shells.

Two elements with filled outermost shell.

Two elements that belong to halogen family.

An element which is tetravalent and forms the basis of organic chemistry.

i. Answer the following:

a. Why do we classify elements?

b) What were the two criteria used by Mendeleev in creating his Periodic Table?

c) Why did Mendeleev leave some gaps in his Periodic Table?

d) In Mendeleev’s Periodic Table, why was there no mention of Noble gases like Helium, Neon and Argon?

e) Would you place the two isotopes of chlorine, 𝐶𝑙– 35 and 𝐶𝑙– 37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.

j) A white coloured water insoluble substance X on reacting with dilute H₂SO₄ released a colourless and odourless gas accompanied by brisk effervescence. When the gas was passed through water, the solution obtained turned blue litmus red. On bubbling the gas through lime water, it initially became milky and milkiness disappeared when the gas was passed in excess. Identify the substance X‘. Write its chemical equations of the reactions involved.

k) Marble statues often slowly get corroded when kept in open for a long time. Assign a suitable explanation.

l) During the reaction of some metals with dilute hydrochloric acid, following observations were made. (i) Silver metal does not show any change. (ii) The temperature of the reaction mixture rises when aluminium (Al) is added. (iii) The reaction of sodium metal is found to be highly explosive. (iv) Some bubbles of a gas are seen when lead (Pb) is reacted with the acid.

m) Explain these observations giving suitable reasons.(A) On heating blue coloured powder of copper (II) nitrate in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed (i) Write a balanced chemical equation of the reaction. (ii) Identity the brown gas X evolved. (iii) Identity the type of reaction. (iv) What could be the nature (acidic, basic or neutral) of aqueous solution of the gas X?

n) Give the characteristic tests for the following gases (i) CO₂ (ii) SO₂ (iii) O₂ (iv) H₂

o) What happens when zinc granules are treated with dilute solution of H 2SO 4, HCl, HNO₃, NaCl and NaOH, also write the chemical equations if reaction occurs.

4. Previous Year Questions:

a. Two elements ‘𝑃’ and ‘𝑄’belong to the same period of the modern periodic table and are in Group-1 and Group-2 respectively. Compare their following characteristics in tabular form:’ [CBSE 2015]

i. The number of electrons in their atoms ii. The sizes of their atoms iii. Their metallic characters iv. Their tendencies to lose electrons v. The formula of their oxides and chlorides.

b) An element ‘𝑋’ belongs to 3rd period and group 16 of the Modern Periodic Table. [CBSE 2016] i. Determine the number of valence electrons and the valency of ‘𝑋’. ii. Molecular formula of the compound when ‘𝑋’ reacts with the hydrogen and write its electron dot

structure.

iii. Name the element ‘𝑋’ and state whether it’ s metallic or non-metallic.’ c) Write the number of periods and groups in the Modern Periodic Table. How does the metallic

character of elements vary on moving ’ [CBSE 2017] A. From left to right in a period , and B. Down a group? Give a reason to justify your answer.

d) What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride? Write the balanced chemical equation for the reaction. State the physical conditions of reactants in which the reaction between them will not take place. [CBSE, 2010] e) Why does tooth decay start when pH of mouth is lower than 5.5? (CBSE 2009) f) Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity (CBSE, 2018) g) Write the electronic configuration two elements X and Y whose atomic numbers are 20 and 17 respectively. Write the Molecular formula of the compound formed when element. X reacts with element Y. Draw electron-dot structure of the product and also state the nature of the bond formed between both the elements. (CBSE, 2017) h) Name the natural source of each of the following acids : (CBSE 2015) i) Citric acid ii) Lactic acid iii) Oxalic acid iv) Tartaric acid i) a) Give the constituents of baking powder. b) Why cake or bread becomes fluffy on adding baking powder? (CBSE 2013) Project work:

1. Make a pocket dictionary of first 50 elements containing information like name of the element, symbol, atomic number, atomic mass and valency.

2. Buy pH paper from the nearby chemist and test the pH value of the solutions given below in the table. Record your observations. What is the nature (acidic/ basic) of each substance based on your observation?

Paste the corresponding pH strip. Also test the same solutions with natural indicators such as beetroot, turmeric, china rose etc. and record the observations with pictures.

S.No. Solution Colour of pH paper Approx. pH Nature

1. Lemon juice

2. Colourless aerated drink

3. Carrot juice

4. Coffee

5. Tomato juice

6. Vinegar

7. Baking Soda

8. Tap water

9. Rasna/ Tang

10. Lemonade/ Shikanji

Make a scrapbook to record all your observations.

SOCIAL SCIENCE

Worksheet No 1, One Marker

1

Define Majoritarianism.

2

Define Resource.

3

What is resource planning?

4

What is sustainable development?

5

Conservation of resources is important for development. Justify the statement.

6

Recognize the form of power sharing by community government in Belgium.

7

How development for one might not be development for others?

8

Classify resources on the basis of ownership.

9

Classify sectors of economy on the basis of ownership.

10

How laterite soil can be made as fit for cultivation?

11

Define Decentralization.

12

Why people in unorganized sector are more prone to exploitation?

Note : Write the answers in the worksheet itself and paste it in your notebook. Worksheet No 2, Three Markers

Q1) Why did people of Sri Lanka developed feeling of alienation? Q2) How did people in SriLanka fight for their rights? Q3) What were the demands of SriLankan Tamils? Q4) How is federalism practiced ? Q5) Write down the features of decentralization? Q6) How economic activities can be divided into different sectors on the basis of nature of work? Q7) How economic activities can be divided on the basis of ownership? Q8) Explain the phases of Resource Planning. Q9) Explain the features of a. Red Soil b. Black Soil c. Alluvial Soil d. Forest Soil Q10) How print created the platform for debate and discussion? Q11) How print created the conditions for French Revolution? Q12) How print allowed the women in India to express their sufferings? Q13) Explain Vernacular Press Act. Q14) Explain Overlapping and Cross Cutting differences.

Q15) Evaluate the steps of water conservation. Q16) How is power shared in coalition government? Q17) How is power shared by social groups? Worksheet 3, Five Markers Q1) How was linguistic diversity handled in Belgium? Q2) What led to Civil War in Sri Lanka? Q3) How is federalism practiced in India? Q4) Why is resource planning needed in a country like India? Q5) Dams are temples of modern India but they are under great scrutiny. Evaluate the statement. Q6) Explain the reasons of power sharing. Q7) How print led to conflicts within and among the religion? Q8) Explain the changes introduced in print culture in late nineteenth century. Q9) How is organized sector different from unorganized sector?

Note: Write the answers of Worksheet 2 and 3 in your notebook.

Title : CONSUMER AWARENESS No Of Pages: 15-20 Use A-4 size sheets to prepare the project before getting it spiral bound. It should be handwritten with the following sequence: Index;acknowledgement;introduction;content;bibliography Photographs should be labelled. Pictures can be drawn or pasted. Add newspaper clippings to make it impressive and attractive accordingly. Take help/reference from the chapter Consumer Rights in your Textbook.