SUMMATIVE ASSESSMENT - I (2011) Lakdfyr ijh{kk&i (2011) 570020 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 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 es 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 / ' ' Page 1 of 16
1. Balance the following chemical equation. MnO 2(s) HCl (aq) MnCl 2(aq) H 2 O (l) Cl 2(g) MnO 2(s) HCl (aq) MnCl 2(aq) H 2 O (l) Cl 2(g) 2. Name metal which react with a very dilute HNO 3 to evolve hydrogen gas. HNO 3 3. List any two steps you would suggest to minimise environmental pollution caused by burning of fossil fuels? 4. Which one is having lesser resistance? A 220V, 60 W bulb or a 220V, 40 W bulb? 220V, 60 W 220V, 40 W 5. What are the products formed when magnesium metal reacts with water? Why do the pieces of metal start floating during the reaction? 6. Dry HCl gas does not change the colour of dry blue litmus paper. Give reasons. HCl 7. Give reason : (i) (ii) A magnesium ribbon should be cleaned before burning it in air. The blue colour of copper sulphate solution changes when iron nails are dipped in it. (i) (ii) 8. Define oxidation and reduction. In the reaction MnO 2 4 HCl MnCl 2 2H 2 O Cl 2 identify which one is reduced and which one is oxidized. Page 2 of 16
MnO 2 4 HCl MnCl 2 2H 2 O Cl 2 9. Which mechanism plays an important role in transportation of water in plants? (i) during daytime (ii) at night (i) (ii) 10. How has the traditional use of wind and water energy been modified for our convenience? 11. An electric heater is rated 1kW, 220V. Calculate the resistance of the heating filament? 1kW, 220V 12. List two different ways of inducing current in a coil. 13. Four resistors of 2 each are joined end to end to form a square ABCD. Calculate the equivalent resistance of the combination between any two adjacent corners. 2 ABCD 14. What happens when quick lime is added to water? Write chemical equation for the above reaction. Which type of reaction is this? 15. Write the balanced equation for the chemical reactions involved, when chlorine is passed over dry slaked lime. Page 3 of 16
sodium bicarbonate reacts with dilute hydrochloric acid. sodium bicarbonate is heated. 16. What is universal indicator? Write the chemical equation involved in the preparation of sodium hydroxide. Name the process. 17. What is tropism? Design an experiment to demonstrate hydrotropism with the help of diagram. 18. (i) Differentiate between sensory neurons and motor neurons. (ii) How is brain protected in our body? (iii) Name the part of the brain responsible for precision of voluntary actions and maintaining body posture and balance of the body. (i) (ii) (iii) 19. Name the various forms in which energy is available from the sea. For any two types give one limitation in harnessing. 20. The components of an electric circuit are 0.5 m long nichrome wire XY, an ammeter, a voltmeter, four cells of 1.5 V each, rhoestat and a plug key. Draw a diagram of the circuit to study the relation between potential difference across the terminals X and Y Page 4 of 16
of the wire and current flowing through it. State the law that relates potential difference across a conductor with the current flowing through it. 0.5 m XY, 1.5 V X Y 21. (i) Parallel combination of resistors R 1 and R 2 and that of R 3, R 4 and R 5 are connected to a battery of 12 V, an ammeter and plug key as shown in the circuit diagram. If R 1 10, R 2 40, R 3 30, R 4 20, and R 5 60 calculate : The total resistance in the circuit. The total current flowing in the circuit. (i) R 1 R 2 R 3, R 4 R 5 12 V R 1 10, R 2 40, R 3 30, R 4 20, R 5 60 Page 5 of 16
22. Why is Alternating Current preferred over Direct Current? List any three reasons. 23. How is copper obtained from its ore? Write equations. How is impure copper refined by electrolytic refining? Draw diagram and write reactions at cathode and anode. OR Write balanced chemical equation for the reactions taking place when (i) (ii) (iii) (iv) (v) zinc carbonate is calcinated. zinc sulphide is roasted. zinc oxide is reduced to zinc. cinnabar is heated in air. magnese dioxide is heated with aluminium powder. (i) (ii) (iii) (iv) (v) Page 6 of 16
24. Draw a neat diagram of excretory system of human beings and label the following : (i) Kidney (ii) Ureter (iii) Urinary Bladder (iv) Urethra How is urine produced. Name two excretory products other than O 2 and CO 2 in plants. (i) (iii) (ii) (iv) O 2 CO 2 OR Draw diagram to show the nutrition in amoeba and label the part used for this purpose. Mention any other purpose served by this part other than nutrition. Name the glands associated with digestion of starch in human digestive tract and mention their role. How is required ph maintained in the stomach and small intestine. ph 25. Explain an activity to show that a current carrying conductor experiences a force when placed in a magnetic field. State the rule which gives the direction of force acting on the conductor. An electron moves perpendicular to a magnetic field as shown in the figure. What would be the direction of force experienced on the electron? Page 7 of 16
OR Explain why two magnetic lines do not intersect each other. State the rule for determining the direction of the magnetic field produced around a current carrying conductor. Draw a sketch of the pattern of field lines due to a current flowing through a straight conductor. SECTION B / ' ' 26. On putting a few drops of a liquid on a ph strip, the colour of the ph strip changed to red. This liquid is most probably : NaHCO 3 HCl NaOH C 2 H 5 OH ph ph - NaHCO 3 HCl NaOH C 2 H 5 OH 27. A student adds a few drops of universal indicator to an aqueous solution of sodium hydroxide. He would observe that the colour of the solution changes from : colourless to red. colourless to blue. red to blue. blue to red. Page 8 of 16
28. Four drops of red litmus solutions were added to each one of the following substances. Which one turns red litmus solution blue? Alcohol Distilled water Sodium hydroxide solution Hydrochloric acid 29. A student took solid quicklime in a china dish and added a small amount of water to it. He would hear : a pop sound a crackling sound a hissing sound no sound at all. 30. Rahul adds aqueous solution of barium chloride to an aqueous solution of sodium sulphate. He would observe that a pungent smelling gas is evolved. the colour of the solution turns red. a yellow precipitate is formed after sometime. Page 9 of 16
a white precipitate is formed almost immediately. 31. A student arranged an electric circuit as shown below : He would observe : no reading either in the ammeter or the voltmeter. no reading in the voltmeter but a finite reading in the ammeter. no reading in the ammeter but a finite reading in voltmeter. a finite reading in both ammeter and the voltmeter. Page 10 of 16
32. A voltmeter has a least count of 0.05 volt. While doing Ohm s law experiment, a student observed that the pointer of the voltmeter coincides with 15th division. The observed reading is : 0.75V 0.075V 7.5V 75V 15 0.05 V 0.75 V 0.075 V 7.5 V 75 V 33. The current flowing through a resistor and the potential difference developed across its end are shown in figures given below. The value of resistance of the resistor is. 0.5 ohm 5.0 ohm 50 ohm 500 ohm 0.5 5.0 50 500 34. For the circuits A and B shown below the voltmeter readings would be : Page 11 of 16
0.6 V in circuit (A) and 2.5 V in circuit (B) 0 V in both circuits 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 (A) 0V (B) 3V 35. The diagram shows a network of four resistors which is connected to an electric source. Identify the resistors which are connected in series in this network. Page 12 of 16
B, A and D B, C and D C, D and A A, B and C B, A D B, C D C, D A A, B C 36. Before carrying out the starch test, the leaf is put in alcohol contained in a beaker and boiled over a water bath. This step is carried out to : extract starch. dissolve chlorophyll. allow water to move into the leaf. make membranes of leaf cells more permeable. Page 13 of 16
37. Given below are the steps to be followed for performing starch test on a green leaf. (A) Boil the leaf in alcohol using water bath. (B) Dip the leaf in boiling water. (C) Dip the leaf in iodine. (D) Put the leaf in alcohol Which one of the following sequences should the students follow to get the correct result? A,D,B,C D,A,B,C B,D,A,C B,A,D,C. (A) (B) (C) (D) A,D,B,C D,A,B,C B,D,A,C B,A,D,C. 38. A student was asked to focus a permanent slide under the high power of a microscope. This involved the following steps which have not been written in a correct sequence : (A) Place the slide on the stage (B) Clean the microscope and lenses (C) Focus the material with coarse adjustment (D) Place the low power objective lens above the slide (E) Sharpen the focus with fine adjustment (F) Bring high power objective lens over the slide Which one of the following is the correct sequence of steps for focusing the slide under high power? B,A,C,E,D,F B,A,C,D,E,F A,B,F,C,D,E B,A,D,C,F,E Page 14 of 16
(A) (B) (C) (D) (E) (F) B,A,C,E,D,F B,A,C,D,E,F A,B,F,C,D,E B,A,D,C,F,E 39. Four students A,B,C and D, make the records given below, for the parts marked X and Y in this diagram. Student X Y (A) Stomata Guard cell (B) Guard cell Stomata (C) Epidermal cell Stomata (D) Stomata Epidermal cell The correct record, out of these is that of student : A B C D X Y A, B, C, D Page 15 of 16
X Y (A) (B) (C) (D) A B C D 40. In the experimental set up to show that CO 2 is given out during respiration KOH is kept in the conical flask to 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 41. In the experiment demonstrating respiration in germinating seeds, the water rises in the delivery tube due to seeds use up oxygen in the flask. CO 2 is given out by germinating seeds. germinating seeds suck the water from the beaker. a partial vacuum is created as CO 2 is absorbed by KOH. CO 2. KOH CO 2 Page 16 of 16