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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 % bl iz u i= dks nks Hkkxksa, Hkkx v vksj Hkkx c es ckavk x;k gsa vkidks nksuksa Hkkxksa ds iz uksa ds mrrj fy[kus gsaa 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 esa 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) 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 (ix) 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 / ' ' 1. A few drops of sulphuric acid are added into water before electrolysis. Why? Page 1 of 16

2 2. Give an example of a metal which is a liquid at room temperature. 3. Give one limitation of harnessing energy from Geothermal sources. 4. The resistance of a resistor is kept constant and the potential difference across its two ends is decreased to half of its former value. State the change that will occur in the current through it. 5. What is an alloy? Give the composition and one use each of the following : Brass Solder 6. Name the product obtained by recrystallisation of sodium carbonate and write its chemical formula. 7. A solution of substance X is used for white washing. What is the substance X? State the chemical reaction of X with water. Why does the colour of copper sulphate solution change when an iron nail is dipped in it? X X X Page 2 of 16

3 8. Balance the following chemical equations : BaCl 2 H 2 SO 4 BaSO 4 HCl Ca(OH) 2 HNO 3 Ca(NO 3 ) 2 H 2 O (iii) Pb(NO 3 ) 2 Pb NO 2 O 2 (iv) MnO 2 HCl MnCl 2 H 2 O Cl 2 BaCl 2 H 2 SO 4 BaSO 4 HCl Ca(OH) 2 HNO 3 Ca(NO 3 ) 2 O 2 (iii) Pb(NO 3 ) 2 Pb NO 2 O 2 (iv) MnO 2 HCl MnCl 2 H 2 O Cl 2 9. Stomata of desert plants remain closed during day time. How do they take up carbon dioxide and perform photosynthesis? CO What is meant by ocean thermal energy? How can electricity be generated from the ocean energy? 11. An electric resistor of resistance 20 draws a current of 5A. Calculate the heat produced by it in 30 seconds. 20 5A A student while studying the force experienced by a current carrying conductor in a magnetic field, records the following observations : The force experienced by the conductor increases as the current is increased The force experienced by the conductor decreases as the strength of the magnetic field is increased. Which of the two observations is correct and why? Page 3 of 16

4 13. A thick wire and a thin wire made from same material and of same length are connected one by one to the same source. In which case a larger current will flow in the circuit? Justify your answer. 14. What is a decomposition reaction? 15. What type of reaction will occur when silver chloride is exposed to sun light? Identify the type of the reaction, when lead (II) nitrate solution is mixed with potassium iodide solution. (II) How is common salt prepared from sea water? What will be the approximate ph of the aqueous solutions of the following salts : Sodium chloride Ammonium Chloride ph 16. A white coloured powder is used by the doctors for supporting fractured bones. Page 4 of 16

5 Write chemical name of the powder. Write its formula. Write chemical equation, when this white powder is mixed with water. 17. What is reflex arc? Draw diagram of reflex arc. Label on it the following : Sensory neuron Motor neuron 18. What is geotropism? Describe an experiment to demonstrate positive and negative geotropism. 19. List the disadvantages of using biomass as fuel in the conventional manner. Give two examples of technological input to improve efficiency of these fuels. 20. Derive an expression for the equivalent resistance of the combination of two resistors connected in series. 21. State the function of electric fuse. An electric bulb is marked 60W. What does this mean? How much energy does it consume if used for 1 hour? Page 5 of 16

6 60W What are the advantages of connecting different electrical appliances in parallel? Mention any three advantages. 23. Write the electron - dot structures for sodium, oxygen and magnesium. Show the formation of magnesium oxide by transfer of electrons and name the ions present in it. 24. OR With the help of a suitable example, explain how ionic compounds are formed. State any three general properties of ionic compounds. Draw a labelled diagram of sectional view of human heart. Describe double circulation in human beings. Why is it necessary? OR Draw a diagram of excretory system in human beings and label the following left kidney vena cava (iii) urinary bladder (iv) urethra Write two major components of human urine. Page 6 of 16

7 (iii) (iv) 25. A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar magnet is : pushed into the coil with its north pole entering first? withdrawn from inside the coil? (iii) held stationary inside the coil? Name the above phenomenon and mention the name of the scientist who discovered it. State the law that relates the direction of current in the coil with the direction of motion of the magnet. (iii) What is a solenoid? OR Draw the pattern of magnetic field produced around a current carrying solenoid. Compare this field to that of a bar magnet. What happens to the magnetic field when the current through the solenoid is reversed? SECTION B / ' ' 26. A student tested the ph of distilled water and found that the colour of the ph paper changed to green. He checked the ph again after dissolving a pinch of common salt in it. The colour of the ph paper this time would be : Page 7 of 16

Green Yellow Red (d) Blue ph ph ph ph (d) 27.

solutions (P), (Q) and (R) taken separately in three test tubes shown in

green in (P), red in (Q) and violet in (R).

Q Q > P > R (d) R > Q > P P, Q, R P Q R ph P > Q > R R > P > Q Q > P > R

A solution of sodium carbonate is prepared by dissolving 1 g of it in 10

8 Green Yellow Red (d) Blue ph ph ph ph (d) 27. On adding a few drops of universal indicator to three unknown colourless solutions (P), (Q) and (R) taken separately in three test tubes shown in the following diagrams, a student observed the changes in colour as green in (P), red in (Q) and violet in (R). The decreasing order of ph of the solutions taken is : P > Q > R R > P > Q Q > P > R (d) R > Q > P P, Q, R P Q R ph P > Q > R R > P > Q Q > P > R (d) R > Q > P 28. A solution of sodium carbonate is prepared by dissolving 1 g of it in 10 ml of distilled water. To this solution is added a strip of blue litmus paper A and strip of red litmus paper B. The colour of strips A and B will be : blue in both cases Page 8 of 16

9 red in both cases red in case of A and blue in case of B. (d) blue in case of A and red in case of B. 10 ml 1 g A B A B A B (d) B A 29. When crystals of FeSO 4 are strongly heated the residue obtained is 30. red in colour. blue in colour. green in colour. (d) colourless. FeSO 4 (d) Iron filings were added to a solution of copper sulphate. After 10 minutes, it was observed that the blue colour of the solution has changed and a layer has deposited on iron filings. Which one of the following set of colours correspond to the colour of the solution and the colour of the coating respectively? Yellow and green. (d) Brown and blue. Red and greenish blue. Light green and reddish brown. 10 (d) Page 9 of 16

10 31. The current through a resistor connected in an electric circuit and the potential difference across its ends are shown in the diagrams. The value of the resistance of the resistor is (d) (d) The symbol of a cell used in electric circuits is (d) (d) 33. In an experiment to study the dependence of current on potential difference across a resistor, Page 10 of 16

the graph is plotted as shown in figure. The value of resistance of the resistor is: 0.2 10 1.25 (d) 5 0.2 10 1.25 (d) 5 34.

11 the graph is plotted as shown in figure. The value of resistance of the resistor is: (d) (d) For the circuits A and B shown below the voltmeter readings would be : 0.6 V in circuit (A) and 2.5 V in circuit (B) 0 V in both circuits Page 11 of 16

(d) 3 V in both circuits 0 V in circuit (A) and 3 V in circuit (B) (A)

For the circuits shown in figure-1 and figure-2 the ammeter reading

0A in both (d) 1.0A in figure 1 and 1.0A in figure 2 1 2 1.0A 1 0.

Given below is a sketch of a leaf of a potted plant which is partially

that light is necessary for the process of photosynthesis.

12 (d) 3 V in both circuits 0 V in circuit (A) and 3 V in circuit (B) (A) (B) (A) 0.6V (B) 2.5V 0V 3V (d) (A) 0V (B) 3V 35. For the circuits shown in figure-1 and figure-2 the ammeter reading would be : 1.0A in figure 1 and 0.0A in figure 2 0.0A in both 1.0A in both (d) 1.0A in figure 1 and 1.0A in figure A 1 0.0A 2 0.0A 1.0A (d) 0.0A 1 1.0A Given below is a sketch of a leaf of a potted plant which is partially covered with black paper and is to be used in the experiment to show that light is necessary for the process of photosynthesis. At the end of the experiment which one of the leaf parts labelled I, II and III will become blue black when dipped in iodine solution? Page 12 of 16

I and II II only I and III (d) II and III I, II III I

To determine that light is essential for

sequence : Pluck the leaf and do the starch test.

13 I and II II only I and III (d) II and III I, II III I II II I III (d) II III 37. To determine that light is essential for photosynthesis, following are the steps, but not in sequence : Pluck the leaf and do the starch test. (iii) (iv) Keep the selected plant in sunlight. Destarch the plant for hours. Cover the leaf with black paper strip. The correct sequence is (iii),,, (iv) (iii),, (iv), (iii), (iv),, (d),, (iv), (iii) Page 13 of 16

14 (iii) (iv) (iii),,, (iv) (iii),, (iv), (iii), (iv),, (d),, (iv), (iii) 38. Which of the following cells possess well defined nucleus? and and and (d), and (d), 39. When we observe the slide of epidermal leaf peel we find that the inner walls of guard cells in contact with the stomatal pore are : Very thick Moderately thick Page 14 of 16

seeds release CO 2 during respiration, the

boiled to make them soft. soaked in vinegar.

figure, water is found to rise in the bent

15 Moderately thin (d) Thin (d) 40. Before setting up an experiment to show that seeds release CO 2 during respiration, the seeds should be : dried completely. boiled to make them soft. soaked in vinegar. (d) kept moist till they germinate. CO 2 (d) 41. In the experimental setup shown in the figure, water is found to rise in the bent tube. The reason is that (d) seeds use up oxygen in the flask. carbon dioxide is given out by germinating seeds. germinating seeds attract water from the beaker. seeds use oxygen and release CO 2 which is absorbed by potassium hydroxide due to which a partial vacumn is created in the flask. Page 15 of 16

16 (d) O 2 CO 2 Page 16 of 16

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

SUMMATIVE ASSESSMENT - I (2011) Lakdfyr ijh{kk&i (2011) 570035 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).