Important Instructions for the School Principal. (Not to be printed with the question paper) Note:

Transcription

1 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 5

2 I, 202 SUMMATIVE ASSESSMENT I, 202 / SCIENCE SC2-062 X / Class X 90 Time allowed : hours Maximum Marks : 90 (i) (ii) (iii) (iv) (v) (vi) (vii) (viii) (ix) General Instructions : (i) (ii) (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 5

3 SECTION-A State the change in the strength of magnetic field at a point when it is moved away from the conductor carrying current. Define synapse. List two properties of a good fuel Write balanced chemical equation and identify the type of chemical reaction when : Barium chloride reacts with sodium sulphate and forms barium sulphate andsodium chloride Zinc oxide is called amphoteric oxide. Justify this statement giving reactions. Name any other amphoteric oxide State the advantages of connecting electrical devices in parallel instead of connecting them in series with the battery? What is induced current? state the rule used to find the direction of induced current g A student heated 2g of lead nitrate in a boiling tube. What changes would be observed as a result of heating. Name the type of reaction that took place. Write the balanced chemical equation for the above reaction. 9. Page of 5

4 State the observation when the following activities are performed in the laboratory. Quick lime is added to water. Zinc metal is dipped in copper sulphate solution. White silver chloride is kept in the sunlight. 0. What is water of crystallization in a substance? Suggest a method to show that the blue copper sulphate crystals contain water of crystallization. How is plaster of paris prepared? give its chemical formula.. = 7 = 2 What are ionic compounds? Give reason for the fact that ionic compounds have high melting point. Show the formation of Magnesium Chloride from its respective elements by the transfer of electrons. At no : of magnesium = 2 At no : of chlorine = V 0.40 A An electric bulb when connected to a 200 V source draws a current of 0.40 A calculate the power and resistance of the bulb.. Describe an activity to show the variation of resistance with area of cross section of a conductor. 4. Rekha draws magnetic field lines close to the axis of a current carrying circular loop. As she moves away from the centre of the circular loop Page 4 of 5

5 she observes that, the lines keep on diverging. Explain her observation. Write two properties of magnetic field lines. 5. Name and state the function of tissues responsible for the transportation in plants. 6. A, B C Name the parts A, B and C in the given diagram and give one function of each part. 7. Define phototropism. Show the process with the help of a neat diagram. How does it occur in plants? 8. Give three advantages of solar cooker. 9. (I) (II) (III) List two limitations each of extracting energy from the (I) winds (II) waves (III) tides Page 5 of 5

6 Distinguish between roasting and calcination. Which of these two methods is used for sulphide ore and why? Write a balanced chemical equation to illustrate the use of aluminium for joining cracked railway lines. OR Oxides of metals which are toward the top of the reactivity series are not reduced by the carbon. State reason. Suffest a method to obtain these reactive metals from their ores. Give chemical equation. Name two such reactive metals What happens when crystals of washing soda are left open in dry air? Name the change that takes place, which two industries are based on the use of washing soda. With the help of balanced chemical equation state the reaction that takes place when sodium hydrogen carbonate is heated during cooking. OR (i) (ii) In an activity to investigate whether all compounds containing hydrogen are acidic. Draw a well labelled experimental set up for the activity - State what is observed giving reasons for the following when. (i) Current is passed through dilute hydrochloric acid in the beaker. (ii) Current is passed through glucose and alcohol solutions in the beaker. 22. R t (I) 5 Page 6 of 5

7 What is heating effect of electric current? Find an expression for the amount of heat produced when a current I flow through a conductor of resistance R for time t. Name any two appliances based on heating effect of current. OR V R, R 2, R 2, V Three resistors of resistances R, R 2 and R are connected in series to a source of potential difference V. Draw a schematic circuit diagram and find the equivalent resistance of the circuit. Three resistances of 2, 4 and 6 respectively are joined in series with a battery of 6V. Draw the circuit diagram and find the value of current flowing the circuit Draw the patterns of field lines due to solenoid carrying electric current. Mark north and south poles in the diagram. Write two important features of the magnetic field due to solenoid. What is an electromagnet? OR (I) (II) Describe an activity with the help of a diagram to obtain the magnetic field lines around a straight conductor. (I) What happens to the deflection of compass needle placed at a given point of the current in the conductor is change? (II) What happens to the deflection of the compass needle if the compass is moved from the conductor but the current through the conductor remains the same. State the rule of determining the direction of the magnetic field associated with a straight conductor carrying current Page 7 of 5

8 (i) (ii) (iii) (iv) Draw the structure of Nephron and label the following parts (i) Glomerulus (ii) Bowman s Capsule (iii) Renal artery (iv) Collecting duct Mention any two substances which are selectively reabsorbed as the filtrate flows along the tubular parts of this unit. OR (i) (ii) (iii) (iv) Draw a diagram of human respiratory system and label the following parts. (i) Trachea (ii) Bronchi (iii) Alveolar sac (iv) Diaphragm State one function each of Alveolar sac and diaphragm. / SECTION B 25. A student was asked by his teacher to heat some of ferrous sulphate in a boiling tube. The type of reaction he performed was - Combination reaction Decomposition reaction Displacement reaction Double displacement reaction 26. A student took some dry quick lime in a Petri dish and added a small amount of Page 8 of 5

9 water to it. He immediately heard a sound which was : a popping sound a crackling sound a hissing sound a crashing sound 27. ph ph Mihir dipped a ph paper first in distilled water and then in the dilute solution of lemon juice. He found that the colour of ph paper has changed from. Indigo to orange. Green to blue. Green to orange Indigo to green 28. A student added few drops of the universal indicator to a dilute hydrochloric acid solution as shown in the diagram. He observed that the colour of the solution changed from colourless to Yellow Red Green Voilet 29. On adding a drop of red litmus solution to an aqueous solution of sodium Page 9 of 5

10 carbonate the colour of red litmus solution changes to blue. On the basis of this observation the nature of the solution should be alkaline acidic neutral highly acidic 0. A group of students performed an activity in laboratory. They dipped an iron nail in an aqueous solution of copper sulphate. After one hour they observed that the colour of the solution changed from. blue to pale green green to blue blue to colourless colourless to pale green. On adding Zn granules to freshly prepared ferrous sulphate solution, a student observed that after some time a coating is formed on the zinc granuals which is dull brown greyish black reddish brown 2. (V) (I) I, II, III IV I II III IV While performing the experiment on studying the dependence of current (I) on Page 0 of 5

11 the potential difference (V) across a resistor, four students I, II, III and IV set up the circuit as shown. The correct result will be obtained by the student I II III IV. (i) (ii) (iii) (iv) (v) (i), (ii) (iv) (i), (iii) (v) (i), (ii) (v) (i), (iii) (iv) The following precautions were listed by a student in the experiment on the study of dependence of current on potential difference : (i) All the connections should be kept tight. (ii) The zero error in the voltmeter and ammeter should be noted and taken into consideration while recording the measurements. (iii) Use copper wire as their as possible for making connections. (iv) The positive and negative terminals of the voltmeter and ammeter should be correctly connected. (v) The key in the circuit, once plugged in, should not be taken out till all the observation have been completed. The precautions which must be observed are (i), (ii) and (iv) (i), (iii) and (v) (i), (ii) and (v) (i), (iii) and (iv) 4. X, Y Z Page of 5

12 A student draw the circuit diagram as shown below. The parts labelled X, Y and Z respectively are : Ammeter, resistor, voltmeter. Ammeter, voltmeter, resistor. Voltmeter, resistor, ammeter. Voltmeter, ammeter, resistor. 5. I III I I II II IV In the experiment on finding the equivalent resistance of two resistors, connected in parallel. The students connected voltmeter correctly in. Page 2 of 5

13 both circuits I, III Circuit I only both circuits I and II both circuits II and IV 6. A, B, C D A B C D Students were asked to observe the circuits A, B, C and D. Vishal was asked, if he was to connect ammeter and voltmeter with a series combination of two resistors in a circuit for finding their equivalent resistance, which circuit would he follow : 7. A B C D KOH Page of 5

14 8. Before testing the leaf for the presence of starch at the end of the experiment, Light is necessary for photosynthesis a student should use a water bath to boil the leaf in Water Alcohol KOH solution Lime water For the experiment Light is necessary for photosynthesis, the potted plant is first kept in darkness for about 48 hours. The students were asked is give the reason of this step. The correct reason is this is done to deactivate the chlorophyll of the leaves destarch the leaves of the plant activate the chlorophyll of the leaves prepare the leaf for photosynthesis Ram observed a well stained leaf peel mount under the high power of a microscope. The colour of the leaf peel appeared to be pinkish red. On the basis of this he identified the stain which was Aectocarmine Iodine Safranin Methylene blue 40. I, II, III IV I II III IV Out of the four I, II, III and IV marked in the diagram of the epidermal peel of a leaf which one would you label as stoma? Page 4 of 5

15 4. I II III IV A student set up an experiment to show that Carbon dioxide is given out during respiration, in the following manner the, reason he gave for water not rising in the bent tube was. 42. Carbon dioxide escaped from the cotton plug. Air was allowed to enter the flask. Water vapour escaped from the cotton plug. Oxygen escaped from the cotton plug A student was asked to give the reason for keeping some potassium hydroxide in a small test tube in the flask with some germinating seeds the experiment to demonstrate Carbon dioxide is given during respiration. He should answer that it is necessary as it. provides oxygen required by the seeds for respiration. absorbs carbon dioxide and create partial vaccum in the flask. absorbs water from the seeds to make them dry. makes the air present in the flask alkaline. - o 0 o - Page 5 of 5