SUMMATIVE ASSESSMENT - I (2011) Lakdfyr ijh{kk&i (2011) : 80 fu/kkzfjr le; % 3?k.Vs vf/kdre vad % 80

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1 SUMMATIVE ASSESSMENT - I (2011) Lakdfyr ijh{kk&i (2011) SCIENCE / fokku Class X / & X Time allowed : 3 hours Maximum Marks : 80 fu/kkzfjr le; % 3?k.Vs vf/kdre vad % 80 General Instructions : i). The question paper comprises of two sections, A and B. You are to attempt both the sections. ii). All questions are compulsory. iii). There is no overall choice. However, internal choice has been provided in all the five questions of five marks category. Only one option in such questions is to be attempted. iv). All questions to section A and all questions of section B are to be attempted separately. v). Questions 1 to 4 in section A are one mark questions. These are to be answered in one word or one sentence. vi). Questions 5 to 13 in section A are two marks questions. These are to be answered in about 30 words each. vii). Questions 14 to 22 in section A are three marks questions. These are to be answered in about 50 words each. viii). Questions 23 to 25 in section A are five marks questions. These are to be answered in about 70 words each. ix). Questions 26 to 41 in section B are multiple choice questions based on practical skills. Each question is a one mark question. You are to select one most appropriate response out of the four provided to you. a lkeku; funsz k % (i) bl iz u i= dks nks Hkkxksa, Hkkx v vksj Hkkx c esa ckavk x;k gsa vkidks nksuksa Hkkxksa ds iz uksa ds mrrj fy[kus gsaa (ii) lhkh iz u vfuok;z gsaa (iii) iwjs iz u i= ij dksbz p;u izkir ugha gs ijurq ikap&ikap vadks ds ikwap iz uksa esa Hkhrjh p;u fn;k x;k gsa bu iz uksa es vki dsoy,d Hkhrjh p;u dks mrrj fy[kus ds fy, pqu ldrs gsaa (iv) vkidks Hkkx v vksj Hkkx c ds lhkh iz uksa ds mrrj i`fkd&i`fkd fy[kus gksaxsa (v) Hkkx v ds iz u la[;k 1 ls 4 ds iz u,d&,d vad ds gsaaa buds mrrj,d kcn vfkok,d okd; esa nsaa (vi) Hkkx v ds iz u la[;k 5 ls 13 ds iz u nks&nks vadksa ds gsaa buds mrrj yxhkx 30&30 kcnksa esa nsus gsaa (vii) Hkkx v ds iz u la[;k 14 ls 22 ds iz u rhu&rhu vadksa ds gsaa buds mrrj yxhkx 50&50 kcnksa esa nsus gsaa (viii) (ix) Hkkx v ds iz u la[;k 23 ls 25 ds iz u ikap&ikap vadksa ds gsaa buds mrrj yxhkx 70 kcnksa esa nsus gsaa Hkkx c ds iz u la[;k 26 ls 41 ds iz u iz;ksxkred dks ky ij vk/kkfjr cgqfodyih iz u gsaa izr;sd iz u,d vad dk gsa fn, x;s pkj fodyiksa esa ls vkidks dsoy,d lcls mi;qdr fodyi pquuk gsa SECTION-A / ' ' Page 1 of 17

2 1. Give a balanced chemical equation to represent the chemical change that takes place when crystals of ferrous sulphate are heated in a test tube. 2. In the formation of a compound XY, atom X gives one electron to an atom of Y. What is the nature of bond in XY? XY X Y XY 3. List two main constituents of biogas. 4. In an electric circuit state the relationship between the direction of conventional current and the direction of flow of electrons. 5. Aluminium occurs in combined state in nature whereas gold is found in free state. Why? 6. A white powder A is a mild non corrosive base and is used in the preparation of cakes. When the powder is heated it gives another powder B. The powder B is re crystallised to get a substance C which has detergent properties. Identify A, B and C and also write balanced chemical equations for the conversions of A to B. A A B C A, B C B B 7. With the help of a suitable example, explain oxidation and reduction in terms of gain or loss of oxygen. 8. Define double displacement reaction with the help of an example. 9. Leaves of a healthy potted plant were coated with vaseline. Will this plant remain Page 2 of 17

3 healthy for long? Give reasons for your answer. 10. What is a nuclear fusion reaction? List any two advantages of nuclear fusion reactions. 11. Study the following electric circuit. Find the reading of (i) the ammeter, (ii) the voltmeter (i) (ii) 12. Two circular coils A and B are placed close to each other. If the current in the coil A is changed, will some current be induced in the coil B? Give reasons. A B A B 13. Consider the following circuit diagram. If R 1 R 2 R 3 R 4 R 5 3 Find the equivalent resistance of the circuit. Page 3 of 17

mentioning the electrode at which each of these are

Why is the volume of the product collected at one electrode

15. How does baking soda help to make cakes and bread soft

List the raw materials used for the preparation of baking

A blue colour salt becomes white on heating.

4 R 1 R 2 R 3 R 4 R Name the products obtained by the electrolysis of water mentioning the electrode at which each of these are collected. Why is the volume of the product collected at one electrode two times of that collected at the other electrode? Explain. 15. How does baking soda help to make cakes and bread soft and spongy? List the raw materials used for the preparation of baking soda. Write chemical equation for its preparation. 16. A blue colour salt becomes white on heating. Give reason for the above observation. What happens when we add water to the salt which is obtained after heating. Also write its formula. 17. Name the hormones secreted by thyroid, pancreas and adrenal glands. Write one Page 4 of 17

function of each of these hormones. 18. What is tropism?

How is nuclear energy generated? State the main advantage and two hazards of nuclear energy. 20.

the potential difference across its two ends. State the condition under which it is valid.

5 function of each of these hormones. 18. What is tropism? Design an experiment to demonstrate hydrotropism with the help of diagram. 19. How is nuclear energy generated? State the main advantage and two hazards of nuclear energy. 20. (i) Name and state the law that connects the electric current flowing through a metallic resistor and the potential difference across its two ends. State the condition under which it is valid. (ii) The V-I graphs shown are of two metallic wires A and B. If their cross- sections are same, which of them must be longer? Why? (i) (ii) V-I A B 21. Study the following circuit Page 5 of 17

(i) Find the net resistance in the circuit.

(i) (ii) 22. A coil made of insulated copper wire is connected to a galvanometer.

then moved away from it? Give reason for your answer and name the phenomenon involved. 23.

6 (i) Find the net resistance in the circuit. (ii) Redraw this circuit and show the position of the ammeter to find the current drawn from the battery. (i) (ii) 22. A coil made of insulated copper wire is connected to a galvanometer. What will happen to the deflection of the galvanometer if this coil is moved towards a stationary bar magnet and then moved away from it? Give reason for your answer and name the phenomenon involved. 23. Name the metal which is low in activity series and exists as liquid at room temperature. Write the name and formula of its ore. How is the metal extracted from this ore? Write the chemical equation for the reaction involved. Page 6 of 17

7 OR State the physical nature of ionic compounds? Give reason for your answer. List any two examples of metals found in native state. Metals high up in the reactivity series cannot be obtained from their compounds by heating with carbon. Why? Name an alloy of lead which is used for welding electrical wires together and state its constituents elements. 24. Draw a neat diagram of human excretory system and label the parts that : (i) (ii) produces urine releases urine to outside What are the end products of digestion of fat and protein in human beings? (i) (ii) OR Name the enzyme present in saliva. Why is it important? What is emulsification? Name the substance that is oxidized in the body during respiration. Page 7 of 17

8 Why are lungs divided into very small sac-like structures? 25. What are magnetic field lines? List any two characteristics of field lines. Draw the pattern of magnetic field of lines due to a current carrying circular loop. OR Draw a schematic diagram showing common domestic circuit. State the function of an earth wire? Why is it necessary to earth metallic appliances such as an electric iron? SECTION B / ' ' 26. Wher student dipped ph paper in the given solution, he found green colour. The given solution may be NaOH solution NaCl solution dilute HCl Na 2 CO 3 solution ph NaOH NaCl HCl Na 2 CO The correct method of finding the ph of a solution is to : heat the solution in a test tube and expose the ph paper to the vapours formed. Page 8 of 17

9 pour the solution on the ph paper. dip the ph paper in the solution. put a drop of the solution on the ph paper using a dropper. ph ph ph ph ph 28. When dil HCl reacts with Zinc metal, the gas liberated is : Oxygen Nitrogen Chlorine Hydrogen HCl 29. When an iron nail rubbed with sand paper is dipped in copper sulphate solution, we observe that copper gets deposited first on the lower part of the nail and proceeds to the upper part. first on the upper part of the nail and proceeds to the lower part. on the entire surface of the nail. on the nail in small patches. 30. While doing an experiment a student observed that the blue colour of the aqueous copper sulphate solution was changed to pale green by immersing a metal rod in it. The Page 9 of 17

metal of the rod used by the student is : iron zinc silver aluminium 31.

2 2V and 2A 1V and 2A 2V and 1A 1V and 1A 2 2V 2A 1V 2A 2V 1A 1V 1A 32.

across a given resistor, four students P, Q, R and S kept the plug key in the

10 metal of the rod used by the student is : iron zinc silver aluminium 31. In the circuit given below, the voltmeter and ammeter readings are respectively 2 2V and 2A 1V and 2A 2V and 1A 1V and 1A 2 2V 2A 1V 2A 2V 1A 1V 1A 32. In an experiment to study dependence of current on the potential difference across a given resistor, four students P, Q, R and S kept the plug key in the circuit closed for time t 1 and then open for time t 2 as given in the table below. Page 10 of 17

St Closed Open t 1 t 2 P 1 4 Q 4 1 R 6 3 S 4 3

of student P Q R S P, Q, R S t 1 t 2 t 2 t 1 P Q

In the experiment on studying the dependence of

students plotted the following graphs between V

The graph that is likely to be correct is / are

11 St Closed Open t 1 t 2 P 1 4 Q 4 1 R 6 3 S 4 3 The best choice of open and closed time is that of student P Q R S P, Q, R S t 1 t 2 t 2 t 1 P Q R S P Q R S 33. In the experiment on studying the dependence of current I on the potential difference V, three students plotted the following graphs between V and I. The graph that is likely to be correct is / are that of : student I only student II only student III only all the three students (I) (V) V I / Page 11 of 17

each 3V and 1A 1V and 3A 3V and 3A 0V 0A 3V 1A 1V 3A 3V 3A 35.

12 I II III I II III 34. In the circuit below the voltmeter and ammeter readings would be respectively : 0V and 0A each 3V and 1A 1V and 3A 3V and 3A 0V 0A 3V 1A 1V 3A 3V 3A 35. In the experiment to determine equivalent resistance of two resistors R 1 and R 2 in series, which of the circuit diagrams show the correct way of connecting the voltmeter? Page 12 of 17

13 I and II II and III I and III II and IV R 1 R 2 I II II III I III II IV 36. A student performed the starch test on a leaf. Some steps involved are shown below. Page 13 of 17

14 The correct sequence of steps should be : (i), (ii), (iii), (iv) (iv), (iii), (ii), (i) (ii), (iii), (iv), (i) (i), (iii), (iv), (ii) (i), (ii), (iii), (iv) (iv), (iii), (ii), (i) (ii), (iii), (iv), (i) (i), (iii), (iv), (ii) 37. Which one of the following is the correct combination of the relevant materials required for setting up an experiment to show that light is necessary for photosynthesis. Destarched leaves, strips of black paper, starch solution and iodine crystal A potted plant, strips of coloured paper, starch solution, iodine and potassium iodide. Destarched potted plant, strips of black paper, starch solution, potassium iodide. Destarched potted plant, strips of black paper and iodine solution. Page 14 of 17

15 38. A student was asked to prepare temporary mount of stomata from a leaf. He should select Tip of the leaf Mid-rib of the leaf Upper epidermis Lower epidermis 39. Four students observed the epidermal peel of leaf under a high power microscope and made the sketches as below. The correct sketch would be : I II III IV I II III IV 40. Given below are four different set-ups to show that CO 2 is released during respiration. Page 15 of 17

16 The set up that will give the desired result A B C D CO 2 A B C D 41. In the experimental set up to show that CO 2 is given out during respiration KOH is kept in the conical flask to Page 16 of 17

17 create partial vacuum in the flask. absorb moisture in the flask. provide O 2 to the germinating seeds. keep the flask air tight. CO 2 KOH O 2 Page 17 of 17

SUMMATIVE ASSESSMENT - I (2011) Lakdfyr ijh{kk&i (2011) SCIENCE / fokku Class X / & X

SUMMATIVE ASSESSMENT - I (2011) Lakdfyr ijh{kk&i (2011) 570027 SCIENCE / fokku Class X / & X Time allowed : 3 hours Maximum Marks : 80 fu/kkzfjr le; % 3?k.Vs vf/kdre vad % 80 General Instructions : i).