Present the entire project work on coloured A4 size sheets and compile it in a designed folder.

Transcription

1 The Summer Break is such a welcoming thought. It is the time to catch up or jump start on so many things you wished to do. While you are on break it is important to keep in touch with your course books too. Your teachers have made the task easier by compiling a to -do- list for you! So make the most of every moment- you will be happy once you are back to school. Present the entire project work on coloured A4 size sheets and compile it in a designed folder.

2 ENGLISH Waste is anything you intend to discard, as it is not wanted any more. Disposing of waste can have a significant impact on the environment. Producing excessive amounts of waste is often a sign that your ways of handling it may be inefficient. The garbage in, garbage out process constitutes the creation of wastes ---- to the dumping of waste in the landfills for its decomposition. Here is your chance to be creative. 1. Write a set of five slogans on Garbage IN Garbage Out or Waste Management on colourful pastel sheets in varied fonts. 2. Write a letter to the editor of a national daily newspaper or the Chief Minister complaining about the heap of garbage in your locality, which has not been attended to for a while. Describe the mess on the roads, smell and menace of mosquitoes. 3. Read chapters 1 to 14 of the novel The Story Of My Life by Helen Keller. Do the following assignments in your language notebook. i) Write the role of Helen s parents in her life. ii) How was the story The Frost King received by Mr. Anagnos of the Perkin s Institute for the blind? Why did Helen call the incident a dark cloud in her childhood s bright sky? iii) Write a brief character sketch of Miss Anne Sullivan, Dr. Alexander Graham Bell and Mr Anagnos and their role in Helen s life. FRENCH Completez cahier d exercice Saraswati Lecon 1,2,3,4, 5,6. Ecrivez un article d environ mots dans votre cahier francais sur le sujet Le sucre est indispensable malgre ses defauts MATHEMATICS In your assignment notebook please complete the following exercises from NCERT Exemplar Text Book 1.Exercise 2.2 QNo.1 to Q No 2 2.Exercise 2.3 QNO.1 to Q No 10 3.Exercise 2.4 QNo.1 to Q No 6 4.Exercise 3.2 QNo.1 to Q No 6 5.Exercise 3.3 QNo.1 to Q No 22 6.Exercise 3.4 QNo.1 to Q No 13 7.Exercise 4.4 QNo.1 to QNo.8

3 1. औ ग - ग 2. इ औ ) ) 2 उ - उ :- उ SCIENCE Project Work - To be done in the Holiday Homework File Improvements in our life-style have resulted in greater amounts of waste material generation. Changes in our attitude have a role to play, as more things are becoming disposable, packaging is changing, nonbiodegradable waste is increasing. Research the questions given below and write suitable answers. 1. Find out what happens to the waste generated at home. Is there a system in place to collect this waste? (You could interview the rag picker.) 2. Find out how the local body (municipal corporation, resident welfare association) deals with the waste. Are there mechanisms in place to treat the biodegradable and non- biodegradable wastes separately? 3. Find out how plastics are recycled. Does the recycling process have any impact on the environment? 4. What do you think will be the impact of the increasing non - biodegradable waste on our environment? 5. Search the internet to find out what hazardous materials have to be dealt with while disposing of electronic items. How would these materials affect the environment. The worksheets given below need to be done in the respective subject notebooks. Please refer to the worksheets that follow a) Worksheet -1 -Chemistry b) Worksheet -2- Biology c) Worksheet -3- Physics

4 ASSIGNMENT 1- CHEMISTRY Do the following questions in your chemistry notebook. Q1. A compound X is used for drinking, has ph=7. Its acidified solution undergoes decomposition in the presence of electricity to produce gases Y and Z. The volume of Y is double than Z, Y is highly combustible whereas Z is a supporter of combustion. Identify X Y and Z and write the chemical reactions involved. Q2. Bhawna took a pale green substance A in a test tube and heated it on the flame of a burner. A brown colour residue B was formed along with evolution of two gases with burning smell of sulphur. Identify A and B. Write the chemical equation involved. Q3. A student took 2-3 g of a substance X in a glass beaker & poured water over it slowly. He observed bubbles along with hissing noise. The beaker becomes quite hot. Identify X. What type of reaction is it? Q4. A student has mixed the solution of Lead (II) nitrate and Potassium iodide. a. What was the colour of the precipitate formed? Can you name of the compound precipitated? b. Write the balanced chemical equation for the reaction. c. What type of reaction is it? Q5. A student burnt a metal A found in the form of ribbon. The ribbon burnt with a dazzling flame and a white powder B is formed which is basic in nature. Identify A and B. Write the balanced chemical equation. Q6. Asha has been collecting silver coins & copper coins. One day she observed a black coating on silver coins and green coating on copper coins. Which chemical phenomenon is responsible for these coatings? Write the chemical name for the Black and Green coatings? Q7. A few drops of Phenolphthalein indicator were added to an unknown solution A. It acquired pink colour. Now another unknown solution B was added to it drop by drop and the solution become colourless. Predict the nature of A and B. Q8. What is the difference between? (a) Combination & Decomposition reaction (b) Displacement & double displacement reaction Q9. Balance the following chemical equations: (i) Cu + HNO₃ Cu(NO₃ )₂ + NO + H₂ O (ii) Zn + H₂ SO₄ ZnSO₄ + H₂ O Q10. Translate the following statement into balanced chemical equation: (i) Ferrous sulphate on heating gives sulphur dioxide, sulphur trioxide and ferric oxide (ii) When dilute hydrochloric acid is added to magnesium carbonate, we get magnesium chloride, carbon dioxide and water (iii) Nitric acid reacts with calcium hydroxide and forms calcium nitrate and water

5 (iv) Sodium bicarbonate decomposes to give sodium carbonate, carbon dioxide and water (v) Sodium chloride reacts with water to give sodium hydroxide, hydrogen gas and chlorine molecule. (vi) Aluminium metal reacts with sulphuric acid to give Aluminium sulphate and Hydrogen gas. Q11. Select combination reaction, decomposition reaction and displacement reaction from the following chemical reaction: (i) C + O₂ CO₂ (ii) NaBr + AgNO₃ AgBr + NaNO₃ (iii) CaCO₃ CaO + CO₂ (iv) H₂ S + Cl₂ 2HCl + S Q12. What change in colour is observed when white silver chloride is left exposed to sunlight? State the type of chemical reaction in this change. Also write the equation. Q13. Solid CaO was taken in a container and water was added slowly to it a) State the two observations made in the experiment. b) Write the name and chemical formula of the product formed. Q14.What changes in the colour of iron nails and copper sulphate solutions do you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes? Q15.(a)What is corrosion? Give three example of corrosion. How can we prevent it? (b)what is rancidity? Write different methods of preventing rancidity. Q16. What is oxidation reaction? Give an example of oxidation reaction. Is oxidation an exothermic or endothermic reaction? Q17. An aqueous solution of metal nitrate P reacts with sodium bromide solution to form yellow precipitate of compound Q which is used in photography. Q on exposure to sunlight undergoes decomposition reaction to form metal present in P along with reddish brown gas. Identify P & Q. Write the chemical reaction & type of chemical reaction. Q18. A water insoluble substance X on reacting with dilute H 2 SO 4 released a colourless and odourless gas which is accompanied by brisk effervescence. When the gas was passed through water, the solution obtained turn blue litmus red. On bubbling the gas through lime water, it initially became milky and the milkiness disappeared when the gas was passed in excess. Identify the substance X and write the chemical equations of the reaction involved. Q19. The three test tubes A, B and C contain iron nails. In A there is water covered with oil. B contains iron nails in water present in half of the test tube. C contains iron nails, anhydrous calcium chloride and no water. In which test tube rusting will take place and why? Q20. A grey coloured metal X is used in making dry cell. It is also used for coating iron metal to prevent it from rusting. When granules of X are added to blue solution of compound of reddish brown metal Y the colour of solution gets discharged and metal Y is formed. Identify X and Y. Write the chemical reaction and identify the type of reaction.

6 ASSIGNMENT 2- BIOLOGY 1) What would happen if carbon dioxide combines with hemoglobin. 2) Autotrophs synthesis food for the living world. Justify this statement by interconnecting autotrophs and heterotrophs. 3) Which of the organs perform the following functions in humans? I.Absorption of food II. Absorption of water 4) Why don t lungs collapse even after forceful expiration? 5) If there were no algae there would be no fish in the sea Comment. 6) What are the function of lymph in our human body? 7) What are the modes of excretion in plants? 8) Give an experiment to prove the essentiality of light for photosynthesis. 9) What is translocation? Why is it essential for plants. 10) Discuss the major steps involved in the process of nutrition in human body. 11) Discuss the mode of nutrition in amoeba in steps as ingestion etc. 12) With the help of a labeled diagram, discuss the structure of cross section of leaf. 13) How are fats digested in our bodies? Where does this process take place? 14) Compare the functioning of alveoli in the lungs and nephron in the kidneys with respect to their structure and functioning. 15) Differentiate between veins and arteries. 16) How is the return of food checked during swallowing? 17) Which one feature is common in the following following pairs. a) Glycogen and starch b) Chlorophyll and haemoglobin c) Gills and lungs d) Arteries and veins 18) What is clotting of blood? Draw a flow chart showing major events taking place in clotting. 19) With the help of a labeled diagram of human excretory system. Mention its important parts and explain. 20) Draw a well labeled diagram of the human digestive system and describe the role of the following in digestion bile, salivary amylase, HCl.

7 ASSIGNMENT 3- PHYSICS Do the following questions in your notebook. Q1. Find the effective resistance between A and B. Q2. Find the charge if number of electron is 4X Find the number of joules in 1 KWh. Q3.A particle of charge 2C is taken from a point at a potential of 100 V to another point at a potential of 150 V. Calculate the work done Q4. What is the potential difference between the conductors A and B shown in below figure? If the conductors are connected by a length of wire, which way will electron flow? When will this flow of electron stop. Q5. A bulb when cold has 1 resistance. It draws a current of 0.3A when glowing from a source of 3V. Calculate the resistance of the bulb when flowing and explain the reason for the difference in resistance. Q6. A 100 V battery is connected across a resistor and causes 5 ma current to flow. Determine the resistance of the resistor. If the voltage is now reduced to 25 V, what will be the new value of the current flowing?

8 Q7. The potential difference between the terminals of an electric heater is 60 V when it draw a current of 4 A form the source. What current will the heater draw if the potential difference is increased to 120 V. Q8. a copper wire has a diameter of 0.5 mm and resistivity of 1.6 X 10-8 m. What will be the length of this wire to make its resistance 10?How much does the reistance change if the diameter is doubled? Q9. Three resistances of 2Ω, 3Ω and 5Ω are connected in electric circuit. Find : (a) maximum effective resistance. (b) minimum effective resistance Q10. Resistance of a given wire of length l is 4 Ω. The wire is stretched uniformly such that its length becomes 3l. Find the new resistance of the stretched wire. Q11. For the circuit shown in below Figure, determine (a) the battery voltage V, (b) the total resistance of the circuit, and (c ) the values of resistance of resistors R1, R2 and R3, given that the potential difference across R1, and R2 and R3 are 5 V, 2 V and 6 V respectively. Q12. Four resistance of 16 ohm each are connected in parallel. Four such combinations are connected in series. What is the total resistance Q13. For the circuit shown in given figure, Determine (a) The reading on the ammeter, and (b) the value of resistor R2 Q14. An electric bulb is connected to a 220V power supply line. If the bulb draw a current 0.5A, Calculate the power of the bulb. Q15. The current/voltage relationship for two resistors A and B is as shown in below figure. Determine the value of the resistance of each resistor and also find the power dissipated through each resistor.

9 SOCIAL SCIENCE What is disaster management? Every city must have Disaster Management Committee to combat natural disaster. Find out about Disaster Management Committee of your city and its function i.e. preparedness and mitigation measures during natural calamities. Show earthquake prone zones of India on an outline map of India. What are earthquake resistant buildings, explain their architecture and materials used for construction.