SUMMATIVE ASSESSMENT - I (2011) Lakdfyr ijh{kk&i (2011) 570019 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 4in 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 es 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 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) (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
1. What happens when quicklime is added to water? 2. Make a distinction between metals and non - metals with respect to the nature of their oxide. 3. Give the composition of the slurry fed into the digester of a gobar gas plant. 4. Which is having more resistance a 220V, 100 W bulb or a 220V, 60 W bulb. 220V; 100W 220V ; 60W 5. Give reason : (i) Ionic compounds have high melting point (ii) Ionic compounds are hard crystalline solids. (i) (ii) 6. While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid. 7. What do you observe when a magnesium ribbon is burnt in air? Is magnesium oxidised or reduced in this reaction? Justify your answer 8. A green coloured hydrated metallic salt on heating loses its water of crystallisation and gives the smell of burning sulphur. Identify the salt and write down the reaction involved. Page 2 of 17
9. Name the two glands associated with the digestive system in humans. Name their secretion also. 10. Give the disadvantages of constructing big dams across the river. How does construction of dams across the river get linked with production of green house gases? 11. State Ohm s law and write the condition in which this law is obeyed? 12. Why is it not advisable to handle domestic electrical circuit with wet hands? 13. Three V-I graphs are drawn individually for two resistors and their series combination. Out of A, B, C which one represents the graph for series combination of the other two. Give reason for your answer. B, C V - I 2 V - I A, Page 3 of 17
14. What are redox reactions? Why is the reaction between manganese dioxide and hydrochloric acid a redox reaction? Identify the substance oxidised and the substance reduced in the above reaction. 15. A water insoluble calcium compound (A) on reacting with dil. H 2 SO 4 released a colourless and odourless gas (B) with brisk effervescence. When gas (B) is passed through lime water, lime water turns milky and again formed compound A. Identify A and B and write the chemical equations for the reactions involved. (A) H 2 SO 4 (B) (B) A A B 16. A white powder is an active ingredient of antacids and is used in preparation of cakes. Name the compound and state how it is manufactured? Give chemical equation. Write an equation to show the effect of heat on this compound. 17. Name the plant growth hormone which is synthesized at shoot tip. Explain with the help of a diagram, why does a plant shoot bend towards light during its growth? 18. How does our body respond when adrenaline is secreted into the blood? Page 4 of 17
19. Name any two exhaustible sources of energy. Would you consider hydrogen to be a cleaner and more efficient fuel than CNG? If yes, why is it not used in everyday life? CNG 20. In the given circuit calculate : (i) (ii) (iii) the total resistance of the circuit, current flowing through the circuit, potential difference across the lamp and the resistor. (i) (ii) (iii) 21. Study the following circuit and answer the following questions. Page 5 of 17
(i) (ii) State the type of combination of the two resistors in the circuit. How much current would flow through 10 resistor and 15 resistors. (iii) What would be the ammeter reading? (i) (ii) 10 15 (iii) 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. A student took sulphur powder on a spatula and heated it. Then he collected the gas evolved by inverting a test tube over it as shown in the figure. Write a balanced Page 6 of 17
chemical equation for the reaction taking place. What will be the action of this gas on : (i) (ii) dry litmus paper and moist litmus paper. What is thermit reaction? Mention its application. (i) (ii) Answer the following : OR Page 7 of 17
How do we find whether a given element is a non metal, if we know its electronic configuration? With the help of a reaction show that zinc is more reactive than iron. In nature aluminium is found in combined state whereas silver is found in free state. Give reason. (d) Why should we not throw small pieces of sodium into a sink in the laboratory? (e) Name any two amphoteric oxides. (d) (e) 24. Sunlight is necessary for photosynthesis. Explain an experiment to prove it. OR Draw the structure of a nephron and label on it the following parts : (i) Glomerulus (ii) Bowman s capsule (iii) Renal artery (iv) Collecting duct What happens to glucose, amino acids, salts and water that enter the nephron along with filtrate? (i) (iii) (ii) (iv) 25. What is a solenoid? Draw the pattern of magnetic field produced around a current carrying solenoid. Page 8 of 17
Compare this field to that of a bar magnet. What happens to the magnetic field when the current through the solenoid is reversed? OR Which effect of the electric current is utilised in the working of an electrical fuse? Is fuse connected in series or in parallel in household circuits? Draw a schematic labelled diagram of a domestic circuit which has a provision of a main fuse, meter, one light bulb and a switch/ socket. / 26. If some solid sodium carbonate is dissolved in a sample of distilled water the ph of the solution will be very much less than 7. more than 7. exactly 7. (d) less than 7 but very close to it. ph - 7 7 7 (d) 7 27. A ph paper is first dipped in distilled water and then in the dilute solution of lemon juice. The colour of ph paper changes from : indigo to green indigo to orange green to blue (d) green to orange ph ph Page 9 of 17
(d) 28. When drops of blue litmus solutions are added to dil. HCI and aqueous NaOH taken in two different test tubes A and B respectively, what will be the colour changes occurring? blue to red in both A and B. no change in both A and B. blue to red in A and no change in B. (d) blue to red in B and no change in A. A B HCl NaOH A B A B A B (d) B A 29. 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 metal of the rod used by the student is : iron zinc silver aluminium (d) 30. When sodium sulphate solution and barium chloride solution are mixed together, the colour of precipitate formed is : Yellow Green White (d) Red (d) 31. An ammeter has a range of (0-3) amperes and there are 30 divisions on its scale. What is its Page 10 of 17
least count? 1.0 A 0.001 A 0.1 A (d) 0.01 A 0-3 A 30 1.0 A 0.001 A 0.1 A (d) 0.01 A 32. 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 (d) 500 ohm 0.5 5.0 50 (d) 500 33. To study the dependence of current on the potential difference across a resistor, two students arranged their circuits as per the setups shown in fig. (A) and (B). They kept the contact J in four different positions marked,, and (d) in the two figures. For the two students their ammeter and voltmeter reading will be minimum when the contact J is in the position : in both the setups (d) in setup (A) and in setup (B) (d) in both setups (d) in setup (A) and (d) in setup (B) Page 11 of 17
(A) (B) J,, (d) J : (d) (A) (d) (B) (d) (A) (B) (d) 34. In parallel combination of resistors, two students connected the ammeter in two different ways as shown in given circuits I and II. The ammeter has been correctly connected in : circuit I only circuit II only both the circuits I and II neither of the two circuits I II Page 12 of 17
I II I II (d) 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? I and II II and III I and III (d) II and IV R 1 R 2 Page 13 of 17
I II II III I III (d) II IV 36. A student performed the starch test on a leaf. Some steps involved are shown below. The correct sequence of steps should be : (i), (ii), (iii), (iv) (iv), (iii), (ii), (i) (ii), (iii), (iv), (i) (d) (i), (iii), (iv), (ii) Page 14 of 17
(i), (ii), (iii), (iv) (iv), (iii), (ii), (i) (ii), (iii), (iv), (i) (d) (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. (d) Destarched potted plant, strips of black paper and iodine solution. (d) 38. In the following sketch of the stomatal apparatus the parts I, II, III, IV were labelled differently by four student : The correct labelling out of the following is : (I) gaurd cell, (II) stoma, (III) starch granule, (IV) nucleus (I) cytoplasm, (II) nucleus, (III) stoma, (IV) chloroplast (I) guard cell, (II) starch granule, (III) nucleus, (IV) stoma (d) (I) cytoplasm, (II) chloroplast, (III) stoma, (IV) nucleus I, II, III IV Page 15 of 17
(I) (II) (III) (IV) (I) (II) (III) (IV) (I) (II) (III) (IV) (d) (I) (II) (III) (IV) 39. The stain used in the preparation of temporary mount of a leaf peel to observe stomata is : safranin methylene blue glycerin (d) iodine solution (d) 40. Given below are four different set ups to show that CO 2 is released during respiration. The set up that will give the desired result is : A B C (d) D Page 16 of 17
CO 2 A B C (d) D 41. A student sets up the apparatus for the experiment to show that CO 2 is released during respiration. After two hours he would observe : (d) KOH turning milky. water level rising in the bent tube in the beaker. water level decreasing in the bent tube. no change in water level in the bent tube. CO 2 KOH (d) Page 17 of 17