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 SC2-050 X / Class X 90 Time allowed : hours Maximum Marks : 90 (iii) (iv) (v) (vi) (vii) (viii) (ix) 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 5

3 . SECTION-A State the condition under which an electron moving though a magnetic field with a given speed experiences maximum force. 2.. Name the mechanism by which amount of hormone in the blood is regulated. State the necessary condition to operate an ocean thermal energy conversion plant CH₄ 2O₂ CO₂ 2H₂O Identify the type of reaction from the following equation and define it. CH₄ 2O₂ CO₂ 2H₂O heat 2 2 Mention one physical property each of a metal and a non-metal which is exceptional to their general properties. 6. S.I. 2 Define potential difference between two points in an electric circuit. State its S.I. unit. Name the device used to measure potential difference between two points in an electric circuit. 7. P Q 2 Two magnets are lying side by side as shown below. Draw magnetic field line between poles P and Q. What does the degree of closeness of magnetic field lines near the poles signify? 8. 2g (iii) A student keeps a china dish containing 2g of white silver chloride in sunlight. Page of 5

4 (iii) State the change that he observes in the colour of silver chloride after some time. State the reason of the change. Write a chemical equation for the reaction taking place Giving one example of each, define the following terms : Corrosion rancidity. 2.. To the three solutions listed below, a few drops of phenolphthalein and blue litmus were added separately. Specify the color change in each case, if any : Name of the solution. Sodium carbonate 2. Hydrochloric acid. Sodium chloride Colour change with Phenolphthalein Colour change with blue litmus. H₂O( ) O₂ HCl Write chemical equations for the reaction of aluminum with the following : H₂O(Steam) O₂ HCl 2. V A piece of wire of resistance 6Ω is connected to a battery of 2V. Find the amount of current flowing through it. Now, the same wire is redrawn by stretching it to double its length, find the resistance of the new (redrawn) wire. Page 4 of 5

5 . 240V, 40W (iii) kwh 5 An electric bulb is rated as 240V, 40W. Calculate --- the electric current through it the resistance of its filament when it is glowing (iii) Energy consumed by it in kwh when it is used for 5 hours 4..5kW 5A What is short circuiting of an electric circuit? An electric motor of.5kw power rating is operated in a domestic electric circuit of current rating 5A. What would happen when it is switched on? Given reason for your answer. List in tabular form three differences between arteries and veins. 7. Draw a diagram of a neuron and label the following on it : Dendrite, Axon, Nerve endings, Cell body 8. Name the hormone released by thyroid gland. Also write the function of this hormone. Which disease develops due to deficiency of iodine in our diet? Give one of its symptoms. 9. What is a solar cell panel? State the energy conversion taking place in these panels. List three areas where solar cells are being used as a source of energy. What causes winds to blow? State two uses of wind energy. List two limitations in harnessing wind energy , 8, 2 2, 8, 7 5 The electronic configuration of a magnesium atom is 2,8,2 and that of a chlorine Page 5 of 5

6 atom is 2,8,7. State the type of bond formed between the two and the formula of the compound formed. Show its formation with the help of electron-dot structure. Also list its two properties. OR CO₂ With the help of a labelled diagram, explain the process of electrolytic refining of copper. Name the substance formed on the surface of copper when it reacts slowly with moist CO₂ in the air An apparatus has been set up as shown in the figure State the observation made when electric current is passed through the solution in the beaker? If the solution is replaced by glucose solution, what will be the observation on passing electric current? Give reason for your observations in each case. In a gas jar containing hydrogen chloride gas, a dry blue litmus paper is dropped. What change is observed? Now a blue litmus paper is Page 6 of 5

7 moistened and dropped into the gas jar. Giving reason, state what is observed? OR (iii) (iv) Write the chemical name and formula of sodium salt used as : baking soda washing soda Write an equation to show what happens when baking soda is heated. (iii) State the reason of using baking soda while making breads and cakes. (iv) List two uses (other than baking) of baking soda. 22. R₁, R₂ R₃ 5 Describe an activity to find the combined resistance when three resistors R₁, R₂ and R₃ are connected in parallel and obtain the relation for it using Ohm s law. State two advantages of connecting household appliances in parallel arrangement. OR.62 0 ⁸Ωm Define resistance of a conductor. State two factors on which resistance of a conductor depends giving the dependence of resistance in each factor. Calculate the resistance of km long copper wire of radius mm. Resistivity of copper is.62 0 ⁸Ωm 2. 5 Define electromagnetic induction. State two ways by which electric current can be induced in a coil. Describe one of these ways with the help of an activity. State the rule to find the direction of induced current. OR Page 7 of 5

8 Draw the pattern of magnetic field lines through and around a current carrying loop of wire. Mark the directions of electric current in the loop magnetic field lines. How would the strength of magnetic field due to current, carrying loop be affected if- radius of the loop is reduced to half its original value? strength of current through the loop is doubled? 24. Draw a diagram of human respiratory system and label: Trachea, Bronchi and Diaphragm. Give reasons for the following: Lungs always contain residual volume. Nostrils are lined with mucus. 5 OR What is lymph? How is composition of lymph different from blood plasma? What is the direction of its flow? List two functions of lymphatic system. / SECTION - B A student adds water to a beaker which contains 5g of quicklime. He observes the beaker becomes cold. the beaker becomes hot. a blue coloured solution is formed. a colourless gas is evolved. 26. Page 8 of 5

9 To a solution of copper sulphate in a beaker, some iron filings are dropped. After a few minutes it is observed that: a white precipitate is formed. the color of the solution becomes darker. a reddish brown coating starts appearing on the iron filings. the solution becomes colourless. 27. ph ph A drop of distilled water is placed on the ph paper. The color of the ph paper changes to : red blue orange green 28. ph ph When a sample of lemon juice is tested with a ph paper, it is found that the color of the ph paper changes to orange. This suggests that lemon juice is : acidic neutral slightly basic highly basic 29. HCl 0.. A student poured a few drops of dil HCl over zinc granules in a test tube. He observed that : brown fumes evolved a pleasant smelling gas was evolved bubbles of a colourless gas were formed there was no gas formation. The freshly prepared aqueous solution of ferrous sulphate appears: blue pale green pink colourless Page 9 of 5

10 When some aluminum powder is added to the solutions of copper sulphate and ferrous sulphate, it is observed after some time that : both solutions become colourless the colour of copper sulphate solution fades while that of ferrous sulphate solution does not both the solutions retain their colour. only ferrous sulphate solution changes its colour Ω 0.25Ω 25Ω 250Ω The current flowing through a conductor and the potential difference across its two ends are as per the readings of the ammeter and the voltmeter shown below. The resistance of the conductor is Ω 0.25Ω 25Ω 250Ω. A student arranged an electric circuit as shown for studying the dependence of current on the potential difference across a resistor: Page 0 of 5

11 He would observe no reading in either 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 the voltmeter. a finite reading in both the ammeter and the voltmeter. 4. (V) (I) A B C D The plot which correctly depicts the dependence of current (I) on potential difference(v) across a ohmic conductor is --- A B C D 5. I II III In their experiment on finding the value of equivalent resistance of two resistors Page of 5

12 connected in series, three students connected the ammeter in their circuits in three different ways as shown below: The ammeter has been incorrectly connected in-- circuit I only circuit II only circuit III only all the three cases 6. V 0.5 A V A V A V A In the circuit shown below, the voltmeter and ammeter readings would be respectively 7. V and 0.5 A V and A V and A V and A 6 After removing chlorophyll, when iodine test is performed on the destarched experimental leaf which was partly covered with black paper and kept in sunlight for six hours, the expected observations would be : entire leaf turns blue-black Page 2 of 5

13 The covered part of the leaf only turns blue-black The part not covered turns blue-black No change in color is observed as chlorophyll is removed The steps taken for setting up an experiment to demonstrate that light is necessary for photosynthesis were as follows : A strip of black paper was clipped on the leaf of a potted plant. The plant was kept in the sun for 4 hours The strip was removed and the leaf was placed in boiling alcohol in a water bath. The leaf was washed and tested for starch. The result was not as expected. Identify the step which had been missed out. The plant was kept in the dark for 24 hours before starting the experiment. The leaf was boiled in water after placing it in boiling alcohol. The leaf was sprinkled with water before placing the black paper strip. A transparent strip was also used to protect the black paper strip from rains etc. 9. A B B C A C A, B C In order to complete the diagram of stomatal apparatus given below, nucleus should be drawn in the parts marked. Page of 5

14 A and B B and C A and C A, B and C 40. A student focussed the leaf epidermal peel under the low power of microscope but could not see all the parts. He should : Use the coarse adjustment knob again to focus the slide. Use the fine adjustment knob to increase magnification. Focus under high power using coarse adjustment knob Focus under high power using fine adjustment knob. 4. CO₂ The set up to show CO₂ is released during respiration gives desired results with : Dry gram seeds Dry Bean seeds Germinating gram seeds Boiled Bean seeds 42. CO₂ In the set up to study CO₂ is released during respiration. Color is added to water in the beaker for : adding volume to water. easy observation of water level increasing the water level making the demonstration attractive. - o 0 o - Page 4 of 5

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