<p> Summer break homework - 2015</p><p>Class X</p><p>Maths</p><p>Q.1 The decimal expansion of the rational number 43/24 53 will terminate after how many places of decimals.</p><p>Q.2 Prove that √5 is an irrational number</p><p>Q.3 Find the [HCF * LCM] for the number 100 and 190</p><p>Q.4 Prove that 5 -2√3 is an irrational number</p><p>Q.5 Use Euclids’s division lemma. Show that the cube of any positive integer is of the form 9q, 9q + 1 or 9q+8 for some integer q</p><p>Q.6 The HCF and LCM of two numbers are 9 and 360 respectively. If one number is 45. Write the other number.</p><p>Q.7 Find the quadratic polynomials, sum of whose zeros is 8 and their products is 12. Hence, find the zeros of the polynomial.</p><p>Q.8 Write the zeros of the polynomial .</p><p>Q.9 Find the zeros of the quadratic polynomial and verify the relationship between the zeros and coefficients of the polynomial.</p><p>Q.10 Find the zeros of the quadratic polynomial and verify the relationship between the zeros and coefficients of the polynomial.</p><p>Q.11 Obtain all other zeros of the polynomial 2x3 - 4x – x2 + 2 if two of its zeros are √2 and -√2.</p><p>Q.12 Find the quadratic polynomial whose zeros are 1 and -3 .Verify the relationship between the zeros and coefficients of the polynomial.</p><p>Q.13 Using division algorithm, find the quotient and remainder on dividing f(x) by g(x), where </p><p> f(x)= 6x3 + 3x2 + x -2 and g(x)= 2x + 1</p><p>Q.14 Find all zeros of the polynomial x4 + x3 -34x2 – 4x + 120 , if two of it’s zeros are 2 and -2</p><p>Q.15. Write the history of any 3 mathematicians whom you like very much and their contributions to mathematics .( coloured A4 size pastel sheets ).</p><p>Q 16. Make a power point presentation on any one chapter given in term 1.</p><p>Page 1 English Communicative</p><p>Reading</p><p>Read the following novel and write its book review:</p><p>The Story of My Life by Hellen Keller.</p><p>Writing </p><p>1. You are Naresh. You happen to go to Agra in a crowded bus on a hot summer day. Record your experience in the form of a paragraph.</p><p>2. Write a debate either for or against the motion on ‘Modern living has made Indian people sick, unhealthy and disease prone’. (150-180 words)</p><p>3. As we neared the airport, we saw a crowd on the highway. We stopped our vehicle wondering what it was…………..Complete the story in 120-150 words, in a suitable manner.</p><p>4. Imagine yourself to be one of the survivors of recently occurred ‘Nepal Earthquake’. Write a page in your diary describing your ordeal with the calamity.</p><p>Grammar </p><p>Look at the words and phrases below. Rearrange them to form meaningful sentences:</p><p>(a). officials/a hand-held/bacteria/the method/device/allows/to detect/with.</p><p>(b). bacteria killers/naturally/the technique/bacteriophages/is based on/ occurring/known as.</p><p>(c). to antibiotics/have been shown/of an/by bacteriophages/to destroy anthrax/ that has become resistant/to extract/enzyme product.</p><p>(d). this technique/infections/in a/help/few years/may fight/difficult to treat. </p><p>Literature Revise the lessons taught & learnt in Fiction and Poetry sections.</p><p>Physics</p><p>1. Draw symbols of different components used in electric circuit.</p><p>2. Write power of the appliances used in your house.</p><p>3. Write capacity of electric current of different of different appliances and wires of your house.</p><p>Page 2 4. Write atleast five ways to save electricity in your home.</p><p>5. How will you suggest role of green energy to conserve the energy sources.</p><p>6. Make a working model for Jawahar Lal Nehru Science Exhibition.</p><p>Page 3 Chemistry</p><p>1. Why oil and fats containing food items are flushed with nitrogen?</p><p>2. How will you test for the gas which liberated when hydrochloric acid reacts with active metal?</p><p>3. Write the different types of chemical reactions and explain them with examples.</p><p>4. Why is respiration considered as an exothermic reaction?</p><p>5. Write the balanced chemical equation:</p><p>(a) nitrogen gas is treated with hydrogen gas in presence of catalyst at 773K to form ammonia gas.</p><p>(b) Ethanol is warmed with ethanoic acid to form ethyl acetate in presence of Con. Sulphuric Acid.</p><p>(c) Sodium hydroxide solution is treated with acetic acid solution to form sodium acetate and water.</p><p>(d) Ethane is burnt in presence of oxygen to form carbon dioxide and water.</p><p>(e) Phosphorus burns in oxygen to give phosphorus penta oxide.</p><p>(f) Barium chloride reacts with zinc sulphate to give barium sulphate and zinc chloride.</p><p>6. What happens when:</p><p>(a) Lead nitrate is heated.</p><p>(b) Lead nitrate solution is reacted with potassium iodide solution.</p><p>(c) Calcium carbonate is heated.</p><p>(d) Iron reacts with saline water.</p><p>7. What is the difference between displacement and double displacement reaction?</p><p>8. In electrolysis of water:</p><p>(a) name the gas collected at cathode and anode</p><p>(b) why few drops of Dil acid is added to water.</p><p>9. What are redox reactions? Identify the oxidized and reduced substance in following reactions:</p><p>(a) magnesedioxide reacts with hydrochloric acid.</p><p>(b) Cupric oxide reacts with hydrogen gas.</p><p>Page 4 BIOLOGY</p><p>1. MAKE A NEWSLETTER SHOWING CURRENT HAPPENINGS IN THE FIELD OF BIOLOGY. ALSO MENTION THE DATE AND SOURCE OF NEWS.</p><p>2. ANSWER THE FOLLOWING QUESTIONS</p><p>A. WHAT HAPPENS IF MUCUS IS NOT SECRETED BY THE GASTRIC GLANDS?</p><p>B. EXPLAIN THE MECHANISM OF BREATHING.</p><p>C. DESCRIBE DOUBLE CIRCULATION IN HUMAN BEINGS. WHY IS IT NECESSARY?</p><p>D. DESCRIBE THE PROCESS OF URINE FORMATION IN KIDNEYS.</p><p>E. WHEN A SPORTSMAN RUNS, HE OFTEN GETS MUSCLE CRAMPS. WHY?</p><p>F. DIFFERENTIATE BETWEEN</p><p> i. ARTERY AND VEIN</p><p> ii. AUTOTROPHIC AND HETEROTROPHIC NUTRITION</p><p> iii. AEROBIC AND ANAEROBIC RESPIRATION</p><p> iv. PARASITE AND HOST.</p><p>G. DRAW NEAT AND WELL LABELED DIAGRAM OF :</p><p> i. HUMAN DIGESTIVE SYSTEM</p><p> ii. HUMAN RESPIRATORY SYSTEM</p><p> iii. HUMAN HEART</p><p> iv. HUMAN EXCRETORY SYSTEM</p><p> v. NEPHRON</p><p>Hindi</p><p>प्रशश: 1- ककिससी एकि वविषय पर नशबबंध ललिखखिए| </p><p>1- ममरम जसीविश किक लिकय </p><p>2- पयकरविरण किम प्रनत हमकरक कितरवय </p><p>प्रशश:2 ददो सकिकरकतमकि समकचकर पढ़किर उस पर अपशम वविचकर वयकत किकीजजयम |</p><p>प्रशश: 3 दस हहबंददी पत्र- पतत्रकिकओबं किम शकम तथक उशकिम सबंपकदकि किम शकम भसी| ललिखखिए</p><p>Page 5 SST</p><p>1. Prepare a project on natural and man-made disasters and methods of mitigation.</p><p>2. Make a list of authors along with their publication and its date from the chapter novels ,society and history.</p><p>3. Show any ten national parks on the outline map of India in your activity file .</p><p>4. Show five wildlife sanctuary and five bird sanctuary on the outline map of India in your activity file .</p><p>5. Define the following .</p><p>(i)GDP</p><p>(ii)GNP</p><p>(iii)HDI</p><p>Chapter : “development” do the activity given on page no. 12 ,14 and 15. </p><p>Sanskrit</p><p>1 सबंधध किक भविनत ? उदकहरकशकशनसकरम ललिखित </p><p>2 घहटिकिक मकधयमम समयबं प्रदररयत |</p><p>3 एकिकबं किथकम ललिखित </p><p>4 सबंखयकविकधचरकबदकश ललिखित (एकि ततः पबंच पयर्यंतम ) </p><p>5 भविकश दमहकलयकम विसनत, भकतरम प्रनत एकिबं विधकरपशकम पत्रबं ललिखित यकतस: दरमसी किककयकम प्रथमसथकशबं प्रकपतविकश | </p><p>Page 6 Page 7</p>