SUMMATIVE ASSESSMENT-1 (2011) SCIENCE CLASS-X

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1 Time allowed:3 hours SUMMATIVE ASSESSMENT-1 (2011) SCIENCE CLASS-X Max.Marks: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 three questions of five marks category. Only one option in each question is to be attempted. iv. All questions of section A and all questions of Section B are to be attempted separately. v. Question numbers 1 to 4 in Section A are one mark question. These are to be answered in one word or one sentence. vi. Question numbers 5 to 13 are two marks questions, to be answered in about 30 words. vii. Question numbers 14 to 22 are three mark questions, to be answered in about 50 words. viii. Question numbers 23 to 25 are five mark questions, to be answered in about in 70 words. ix. Question numbers 26 to 41 in section B are multiple choice questions based on practical skills. Each question is a one mark question. You are to choose one most appropriate response out of the four provided to you. SECTION-A 1. Identify the substance oxidized and reduced in the chemical reaction. MnO 2 + 4HCl MnCl 2 + 2H 2 0+ Cl 2 2. Name the metal whose foils are used for the packing of food materials 3. What are fossil fuels? 4. An electric bulb s rated 200v 100w. What is its resistance? 5. What are amphoteric oxides? Give two examples of amphoteric oxides 6. A drop of litmus solution is added to each of the four solutions given below. State the colour of litmus solution observed in each: soap solution, sodium carbonate solution, vinegar, lemon juice. 7. What does one mean by exothermic and endothermic reactions? Give examples. 8.When water is added to a white powder A, vigorous reaction takes place and a large amount of heat is released.a is also used for white washing.identify A. Write a chemical equation for its reaction with water and name the product. 1

9. What advantage over an Aquatic Organism does a terrestrial organism have with regard to obtaining oxygen for respiration? 10. What is tidal energy? How is it harnessed? 11.

2 9. What advantage over an Aquatic Organism does a terrestrial organism have with regard to obtaining oxygen for respiration? 10. What is tidal energy? How is it harnessed? 11. The resistance of a wire of length 80cms and uniform area of cross section 25 cm 2 is find to be 1.5 ohms. Calculate the resistivity of the wire. 12. State Fleming s left hand rule? 13. Why is parallel arrangement used in domestic circuit? 14. Write the balanced chemical equations for the following reactions: (i) Hydrogen gas combines with nitrogen to form Ammonia (ii) Hydrogen sulphide gas combines burns in air to give water and sulphur dioxide. (iii)barium chloride reacts with sulphuric acid to give Barium sulphate and Hydrochloric acid 15.An apparatus was set up as shown in the figure.it was observed that when an aqueous solution of HCl was taken in the beaker and the circuit was closed, the bulb in the circuit began to glow, but it did not glow when the experiment was repeated with glucose solution. What could be the reason? Would the bulb glow if the same experiment is repeated with an aqueous solution of NaOH and NaCl? Why? 16.A compound which is prepared from Gypsum has the property of hardening when mixed with a proper quantity of water. (i) Identify the compound. (ii) Write the chemical formula of the compound (iii) For what purpose is it used in hospitals? 17. (a) Name the hormone secreted by thyroid gland? Write its function? 2

3 (b) Why is the use of iodised salt advised to us? 18 I. Name the parts labelled A and B in the given neuron? II. Which part acquires the information in the neuron? 19. How is gobar gas produced in a plant? 20. State and verify ohm s law? 21. Three resistors having resistances 2Ω, 3Ω and 5Ω are connected in series and parallel. Calculate the effective resistance in each case. 22. An electric motor takes 5amp from a 220v line. Find the power and energy consumed in 2 hours. 23.(i) Write the electron dot structures for sodium, chlorine and magnesium. (ii) Show the formation of sodium chloride and magnesium chloride by the transfer of electrons (iii) What are the ions present in these compounds? (iv) Why do ionic compounds have high melting points? (OR) Give reasons: (i) Platinum, Gold and Silver are used to make jewellery 3

4 (ii) Sodium, Potassium and Lithium are stored under oil (iii) Aluminium is highly reactive metal, yet it is used to make utensils for cooking (iv) Carbonate and Sulphide ores are usually converted into oxides during the process of extraction. 24. (a) Draw a diagram depicting human alimentary canal and label on it Gallbladder, Liver and Pancreas? (b) State the roles of liver and pancreas? (OR) (a) Draw a sectional view of the human heart and label on it Aorta, Right ventricle and pulmonary vein? (b) State the functions of the following components of transport system i) Blood ii) Lymph 25. Give the principle, construction and working of electric motor or AC generator. SECTION-B 26.When iron nails are dipped in copper sulphate solution for about 30 minutes,what are the correct observations? (a) Iron nails become blackish in colour and there is no effect on blue colour of copper sulphate solution (b) Iron nails become brownish in colour and the blue colour of copper sulphate becomes violet. (c) Iron nails become white and the blue colour of copper sulphate solution fades. (d) Iron nails become brownish in colour and the blue colour of copper sulphate solution fades. 27. When the stopper of a bottle containing colourless liquid was removed, the bottle gave a smell like that of vinegar.the liquid in the bottle could be: (a) Hydrochloric acid solution (b)sodium Hydroxide solution (c) Acetic acid solution (d) Saturated sodium hydrogen carbonate solution. 28. When a few drops of HCl are poured over solid sodium carbonate, a colorless gas is evolved which extinguishes the flame of a burning match stick. The gas evolved is: (a) Carbon monoxide gas (b) Methane gas (c) Carbon dioxide gas (d) Nitrogen gas. 4

5 29.A student was performing a double displacement reaction between a solution of sodium sulphate and a solution of Barium chloride.what is the colour of Barium sulphate precipitate formed as a product? (a) Yellow (b) Orange (c) Pink (d) White 30. The gases obtained on heating ferrous sulphate are (a) SO 2 (b) SO 3 (c) H 2 S (d) Both A and B. 31. To study the dependence of current (I) on the potential difference (V) across a resistor, the correct way of connecting the ammeter and voltmeter in the circuit is. a. Ammeter and voltmeter are connected in series. b. Ammeter is connected in parallel and voltmeter in series. c. Ammeter is connected in series and voltmeter in parallel d. Ammeter and voltmeter both are connected in parallel. 32. Graph plotted by four students A,B,C and D for the experiment to study the dependence of current (I) on the potential difference (V) across a resistor are shown below: a. b. c. I I I d. V v v I v 33. Four identical cells of emf 1.5 v each were connected in four different ways as shown below: 5

6 a. b. X Y X Y c. d. X X Y 34. A student finds that there are 20 divisions between the 0 mark and 1 V mark of a voltmeter. What is the least count of this voltmeter? a. 0./ \[;P0-5 v b V c. 0.2 V d V 35. Which of the following instruments does not have plus (+) or minus (-) sign marked on it while representing in a circuit diagram? a. Rheostat b. Voltmeter c. Ammeter d. Cell 36. Which one of the following is not essential for photosynthesis? (a) Oxygen (b) Carbon dioxide (c) Light (d) Chlorophyll 37. Before carrying out the test for the presence of starch in a leaf on exposure to sunlight, the leaf is put into alcohol contained in a beaker and boiled over a water bath. This step is carried out to (a) Extract starch (b) Dissolve chlorophyll (c) Allow water to move into the leaf (d) Make membranes of leaf cells more permeable. 38. Given below is the figure of stomata. Select the correct labelling for the diagram. 6

(a) 1.Epidermal cells 2.stoma 3.guard cell 4.chloroplast (b) 1.Guard cell 2.Stoma 3.Epidermal cells 4.chloroplast (c) 1.Stoma 2.Epidermal cells 3.chloroplast 4.Guard cell (d) 1.Chloroplast 2.stoma 3.Epidermal cell 4.

7 (a) 1.Epidermal cells 2.stoma 3.guard cell 4.chloroplast (b) 1.Guard cell 2.Stoma 3.Epidermal cells 4.chloroplast (c) 1.Stoma 2.Epidermal cells 3.chloroplast 4.Guard cell (d) 1.Chloroplast 2.stoma 3.Epidermal cell 4.Guard cell 39. Stomata play an important role in (a) Respiration (b) Photosynthesis (c) Transpiration (d) All the above 40. Given below is the diagram of the experiment set up to show carbon dioxide is given out during respiration. The part which is incorrectly labelled is (a) KOH pellets (c) Germinating seeds (b) Delivery tube (d) Lime water 7

8 41. The following experimental set-ups were kept in the laboratory to show that CO 2 is given out during respiration. (A) (B) After two hours, student observed that water rises in the delivery tube: (a) only in set up (A) (c) in both (A) and (B) (b) only in set up (B) (d) neither in setup (A) nor in setup (B) 8

9 MARKING SCHEME- SCIENCE (THEORY) SA-1 SUUPLIMENTARY TEST CLASS X SECTION-A 1. Substance oxidized : HCl Substance reduced : MnO 2 2. Aluminum 3.Coal and petroleum products are called fossil fuels. v 2 4. R= p ½ = 200X = 400Ω ½ 5. The metal oxides which show acidic and basic behavior are called amphoteric oxides. 1 Examples: ZnO and Al 2 O 3 (1/2+1/2) 6. Soap solution : Blue 1/2 Sodium carbonate: Blue 1/2 Vinegar : Red 1/2 Lemon juice: Red 1/2 7.Exothermic reactions : Chemical reactions which occur with the evolution of heat. 1/2 C + O 2 CO 2 1/2 Endothermic reactions : Chemical reactions which occur with the absorption of heat. 1/2 N 2 +O 2 2NO 1/2 8.Calcium Oxide / Quick lime / CaO 1/2 CaO + H 2 O Ca(OH) 2 + Heat. 1 1

10 Product : Calcium Hydroxide / Slaked lime. 1/2 9. Aquatic organisms obtain oxygen which is dissolved in water. The amount of dissolved Oxygen is fairly low. Terrestrial organisms take Oxygen directly present in the atmosphere for respiration 1+ 1= Energy derived from rising and falling tides is called tidal energy 1 It is harnessed by construction a dam across a narrow opening to the sea. 11.P = RA L ½ = 1.5X ½ =.47 ohm cm Correct Statement All the appliances work at the same voltage 1 If one of the appliances is not working, other appliances keep on working i. N H 2 2NH 3 1 ii. 2H 2 S + O 2 2H 2 O + SO 2 1 iii. BaCl 2 + H 2 SO 4 BaSO 4 + 2HCl The bulb could glow when an aqueous solution of HCl was taken because HCl (aq) provided hydrogen and chloride ions which are carriers of electric charges in a solution, while glucose ( being covalent compound ) did not furnish any ions in the solution. 1 NaOH, NaCl The bulb will glow. 1 Because both of them being ionic compounds furnish ions in aqueous solutions (1) Plaster of Paris has a property of setting into hard mass on setting with water. 1 2

11 (2) CaSO 4. ½ H 2 o + 1 ½ H 2 o CaSO 4.2H 2 O 1 Plaster of paris water gypsum Plaster of paris is used in hospitals for setting fractured bones. 17. Thyroxine 1 Function: Regulates metabolism of carbohydrate, protein and fat. 1 Essential for synthesis of thyroxine and deficiency in the diet causes goiter ½ + ½ 18. i) A- dendrite 1 B- Axon 1 II) Dendrite Diagram 1 Explanation Statement 1 Diagram 1 Explanation Se ries R =R 1 +R 2 +R 3 ½ = = 10 Ω ½ 1 1 = R R R R3 ½ = ½ 31 = = R = Ω ½ P = V I ½ 3

12 1 = 220 x 5 = w ½ 100 W = VIt ½ = 220 x 5 x 7200 = 792 x 10 4 J ½ 23. (i)malleable and ductile in nature 1 (ii) Reacts violently when kept open in air 1 (iii)best conductor of heat.1 (iv) Because it is easier to reduce metallic oxide to metallic state than metal sulphides and metal carbonates 2 23.(i) Na Na + + e - Cl + e - Cl 2 ii)mg Mg e - Cl + e - Cl - 2 4

13 (iii) Because considerable amount of energy is required to break the strong inter- ionic attractions between the ions.(1) 24. a) Diagram of human alimentary canal and labelings of Gallbladder, Liver and Pancreas b) Liver-secrete bile juice. Bile salts break down large globules of fat into smaller globules increasing the efficiency of enzyme action 1 Pancreas secrete pancreatic juice It contain trypsin for digestion of protein/ Lipase for breaking down emulsified fat ½ + ½ (OR) (a) Diagram of human heart and labeling of Aorta, Right ventricle and pulmonary vein (b) Blood -Transport of food / Respiratory gases (Oxygen and Carbon dioxide) ½ + ½ Lymph carries digested and absorbed fat from intestine and drains excess fluid from extra cellular space back into the blood Principle 1 Diagram 1 Construction & Working 3 Principle 1 Diagram 1 Construction & Working ANS: D 27. ANS: C 28. ANS : C 29. ANS : D 30. ANS: D 31. ANS: C 32 ANS: A 33 ANS: B OR 5

14 34 ANS: D 35 ANS: A 36. ANS: A 37. ANS: B 38. ANS: B 39. ANS: D 40. ANS: D 41. ANS: A 6

2. Name the part of the brain which controls posture and balance of the body?

. Give two characteristics of magnetic field lines. SECTION-A 2. Name the part of the brain which controls posture and balance of the body?. Mention two different ways of harnessing energy from ocean.