Important Instructions for the School Principal (Not to be printed with the question paper) ) This question paper is strictly meant for use in school based SA-I, September-202 only. This question paper is not to be used for any other purpose except mentioned above under any circumstances. 2) The intellectual material contained in the question paper is the exclusive property of Central Board of Secondary Education and no one including the user school is allowed to publish, print or convey (by any means) to any person not authorised by the board in this regard. ) The School Principal is responsible for the safe custody of the question paper or any other material sent by the Central Board of Secondary Education in connection with school based SA-I, September-202, in any form including the print-outs, compact-disc or any other electronic form. 4) Any violation of the terms and conditions mentioned above may result in the action criminal or civil under the applicable laws/byelaws against the offenders/defaulters. Note: Please ensure that these instructions are not printed with the question paper being administered to the examinees. Page of 6
I, 202 SUMMATIVE ASSESSMENT I, 202 / SCIENCE SC2-069 X / Class X 90 Time allowed : hours Maximum Marks : 90 (iii) (iv) (v) (vi) 4 7 0 (vii) 8 9 50 (viii) 20 24 70 (ix) 25 42 General Instructions : (iii) (iv) (v) (vi) (vii) (viii) (ix) The question paper comprises of two Sections, A and B. You are to attempt both the sections. All questions are compulsory. 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. All questions of Section-A and all questions of Section-B are to be attempted separately. Question numbers to in Section-A are one mark questions. These are to be answered in one word or in one sentence. Question numbers 4 to 7 in Sections-A are two marks questions. These are to be answered in about 0 words each. Question numbers 8 to 9 in Section-A are three marks questions. These are to be answered in about 50 words each. Question numbers 20 to 24 in Section-A are five marks questions. These are to be answered in about 70 words each. Question numbers 25 to 42 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. Page 2 of 6
. SECTION - A Where do we connect a fuse with live wire or with neutral wire? 2. Why cytokinins present in greater concentration in areas of rapid growth?. List two areas where solar cells are being used as a source of energy. 4. 2 (iii) When potassium iodide solution is added to a solution of lead (II) nitrate in a test tube, a precipitate is formed. State the colour of this precipitate. Name the compound precipitated. (iii) Write the balanced chemical equation for this reaction. 5. 2 Aluminium is more reactive than iron but it does not corrode like iron. Why? Corrosion of iron can be prevented by coating it with a layer of oil. State reason. 6. R I t 2 Derive an expression for the heat produced in time t in a wire or resistance R, which a carrying a current I. 7. 2 Draw a pattern of magnetic field lines around a straight conductor carrying electric current. How this magnetic field be affected on Increasing the current through the conductor? Reversing the direction of flow of current in the conductor? Page of 6
8. (iii) (iii) State the colour of ferrous sulphate crystals before heating and after heating Mention the smell of the gases evolved when ferrous sulphate crystals are further heated. Write the balanced chemical equation for the reaction. What kind of reaction does it represent? 9. X X Why is respiration considered an exothermic process? A shiny brown colored element X on heating in air becomes black in colour. Name the element X and the black colored compound formed. Give a chemical equation for this reaction. 0. HCl HNO (iii) HCl Give reasons: Copper vessels develop a green coating when exposed in air. Acids like HCl and HNO show acidic characters in aqueous solutions while solutions of compound like alcohol and glucose do not show acidic character. (iii) Dry HCl gas does not change the colour of the dry litmus paper.. Define the term alloy and amalgam. Name the alloy used for welding electric wires together and state its constituents. 2. A B Page 4 of 6
Find the total resistance between the points A and B in the circuit diagram shown.. K 0.6 A L K 2 5 Ω Study the circuit show below: A current of 0.6 A shows in the circuit when the key K 2 is closed. Find the resistance of the lamp L. Now if the key K 2 is also closed, what change in current flowing through the 5 Ω conductor and potential difference across the lamp will take place. State reason for your answer. 4. 000w; 220v 220V A 5. What happens if a domestic electric circuit is short circuited? An electric iron of rating 000w; 220v is to be operated in a 220V electric circuit in which an electric fuse of A rating is connected. What is likely to happen when the electric iron operates? Justify your answer. State the three common features of respiratory organs of animals. Page 5 of 6
6. What is the pathway of reflex arc? Answer the following: Which hormone is responsible for the changes noticed in females at puberty? Deficiency of which hormone is responsible for the rise of blood sugar level? Draw diagram of neuromuscular junction. ++= 7. 8. 9. Describe an experiment to demonstrate hydrotropism. Describe the process of biogas production in a biogas plant. Mention three advantages and three disadvantages of producing hydro electricity by building dams on rivers. 20. ++=5 MgCl 2 When calcium metal is added to water, the gas evolved does not catch fire but the same gas evolved on adding sodium metal to water catches fire. Why is it so? Show the formation of MgCl 2 form its elements by transfer of electrons. What is meant by refining of metals? Describe the method used to refine copper. OR Why are metal sulphides and carbonates converted into metal oxides prior to reduction during the extraction of metals? Explain by giving one example in each case. State the importance of displacement reactions in reducing metal oxides to Page 6 of 6
2. metals. Why are metals produced in the molten state? Give any one example. A 5 What is a neutralization reaction? Give two examples. Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride. OR Describe an activity to show that acids produce ions only in aqueous solution. 22. 5 5.0 V, 00m A State ohm s law. Draw a graph between voltage and current for a metallic conductor. What is the effect of temperature on the resistivity of metals? A bulb is rated at 5.0 V, 00m A. Calculate Power and Resistance. OR V I (iii) 0.2 A 0.8 V 00W, 200V. KWh State the formula showing how the current I in a conductor varies when the potential difference V applied across it is increased stepwise. Show this relationship on a schematic graph. (iii) Calculate the resistance of a conductor if the current flowing through it is 0.2 A when the applied potential difference is 0.8 V. An electric lamp is marked 00W, 200V. It is used for 5 hours daily. Page 7 of 6
2. Calculate its resistance while glowing energy consumed in kwh per day. 5 State the rule to determine the direction of a force experienced by a current carrying straight conductor placed in magnetic field which is perpendicular to it and current induced in a coil due to its rotation in a magnetic field. What is a solenoid? Draw magnetic field lines due to a current carrying solenoid. OR 24. What is an electro magnet? List any of its two uses. Draw a labelled diagram to show how an electro magnet is made. What is the purpose of soft iron core used in making an electromagnet? +2=5 Draw a diagram of excretory system in human beings and label on it. Urinary bladder, Urethra, Vena cava, Aorta. State two vital functions of the kidney. OR Draw a diagram of human alimentary canal and label on it; gall bladder, liver, pancreas, oesophagus. Page 8 of 6
25. Bile does not contain any enzyme but it is essential for digestion. Explain the statement. SECTION - B Iron filings were added to a solution of copper sulphate. After 0 minutes, it was observed that the color of the solution changes and a layer gets deposited on iron filings. The color of the solution and that of the coating would, respectively, be: yellow and green brown and pale green red and greenish blue pale green and reddish brown 26. (A) (B) (C) (D) A B C D Students were asked to study the reaction between barium chloride and sodium sulphate. Four different reports of the experiment are given below. Procedure (A) Mixed powder of barium chloride and Sodium sulphate (B) Mixed solutions of barium chloride and Sodium sulphate (C) Added solution of barium chloride to sodium sulphate powder (D) Added powder of barium chloride to Sodium sulphate solution The correct report was Observation The color of mixture changes to yellow Thick white precipice is formed Solution becomes turbid No change is observed Page 9 of 6
A B C D 27.,, ph ph > > > > > > > > Four students,, and measured the ph value of water, lemon juice, and sodium bicarbonate solution. What is the correct decreasing order of the ph values? water>lemon juice>sodium bicarbonate lemon juice>water>sodium bicarbonate sodium bicarbonate > water > lemon juice water > sodium bicarbonate > lemon juice 28. ph HCl (iii) NaOH (iv) ph I II III IV In an experiment to test the ph, of a given sample using ph Paper, four students recorded the following observations: Sample taken ph paper color turned to Water Blue Dil. HCl Red (iii) Dil. NaOH Blue (iv) Dil. Acetic acid Orange Which one of the following students recorded incorrect observations? I II III IV 29. HCl, When a student added zinc granules in dilute HCl, a colorless and odourless gas was evolved. On testing with a burning match stick it was observed that the match stick: continued to burn brilliantly burnt slowly with a blue flame extinguished and gas burnt with pop sound continued to burn brilliantly and gas burnt with pop sound Page 0 of 6
0. To show that zinc is more reactive than copper, the correct procedure is to prepare zinc sulphate solution and dip copper in it heat zinc and copper strips prepare copper sulphate solution and dip zinc strip in it prepare ferrous sulphate solution and dip both the strips in it. A zinc granule was placed in a beaker containing copper sulphate solution. On observing the granule the next day, it was noticed that the zinc granule remained as it was the colour of the granule changed the zinc granule became thinner the zinc granule became thicker 2..5 V 6 V A B C D A student has to connect 4 cells of.5 V each to form a battery of voltage 6 V. The correct way of connecting these cells is shown in figure: Page of 6
. A B C D A V A 2 V A V 2 A 2 V 2 The normal positions of two ammeters and two voltmeters are shown. For verification of Ohm s law, the students should select: 4. ammeter A and voltmeter V ammeter A 2 and voltmeter V ammeter A and voltmeter V 2 ammeter A 2 and voltmeter V 2 ( 4 ma, 0.4V) ( ma, 0. V) ( 4 ma, 0.2V) (2 ma, 0.2 V) ( 4 ma, 0.4V) (2 ma, 0.2 V) ( 4 ma, 0.2 V) (2 ma, 0. V) The rest positions of the needles in a milliammeter and voltmeter when not being used in a circuit are as shown in the figure. The zero error and least count of these two instrument are: ( 4 ma, 0.4V) and ( ma, 0. V) respectively ( 4 ma, 0.2V) and (2 ma, 0.2 V) respectively ( 4 ma, 0.4V) and (2 ma, 0.2 V) respectively Page 2 of 6
5. ( 4 ma, 0.2 V) and (2 ma, 0. V) respectively R R 2 R 2 V R V R, R 2 V Which of the circuit components in the adjoining circuit diagram are connected in parallel? R and R 2 only R 2 and V only R and V only R, R 2 and V 6. A B C D To determine the equivalent resistance of two resistors, when connected in series, the correct way of connecting the ammeter and voltmeter in the circuit is: A B C D Page of 6
7. A B C d A leaf from a destarched plant is covered with black strip is shown in figure. The starch test is done on the leaf after keeping the leaf in potted plant in sunlight for 4 hours. The result will be as shown in diagram A B C d 8. (I) 4 (II) 48 (III) (IV) I, III, IV, II I, IV, III, II II, IV, III, I II, III, I, IV The steps necessary for setting up the experiment, To demonstrate that light is necessary for photosynthesis are not given here in proper sequence. (I) Keep the potted plant in sunlight for to 4 hours (II) Keep the potted plant in darkness for about 48 hours (III) Cover a leaf of the plant with a strip of black paper (IV) Pluck the leaf and test it for starch The correct sequences of steps is: I, III, IV, II I, IV, III, II II, IV, III, I II, III, I, IV Page 4 of 6
9. A B C D Students observed the epidermal peel of a leaf under the high power of a microscope. The following are the sketches made by them. The correct sketch is A B C D 40. A, B, C D X Y A B C D X Y A B C D Four students A, B, C and D make the records given below, for the parts marked X and Y in this diagram. Students X Y A Stoma Guard cell B Guard cell Stoma C Epidermal cell Stoma D Stoma Epidermal cell Page 5 of 6
The correct record, out of these, is that of student: A B C D 4. The following experiment was not set up to show that a gas is given out during respiration. But there was no rise in the level of water. This was because, Germinating seeds have not been kept under water in the flask. Water is kept in the beaker instead of lime water. The cork on the flask is made of rubber. No substance is kept in the flask to absorb the gas given out by the seeds. 42. CO 2 What are precautions which should be taken in the experiment to show that CO 2 is produced during respiration? Apparatus should be air tight and the end of the delivery tube in the flask should not touch the germinating seeds. The other end of the delivery tube should dip into water The germinating seeds should be kept moist and should not be let dry. All of the above. - o 0 o - Page 6 of 6