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

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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 SC2-052 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

current carrying wire deflects a magnetic needle placed near it.

State the transformation of energy taking place in a solar cell panel.

chemical equation Balance the following chemical equation Na H 2O NaOH

2 Give reason for the following : Sodium metal is kept immersed in

aluminum powder is added in it. 6. SI 2 Define the S.

3 SECTION-A. 2.. State the conclusions that can be drawn from the observation that a current carrying wire deflects a magnetic needle placed near it. State the function of : gustatory receptors, and olfactory receptors State the transformation of energy taking place in a solar cell panel Na H 2O NaOH H 2 State the law that is followed by balancing a chemical equation Balance the following chemical equation Na H 2O NaOH H Give reason for the following : Sodium metal is kept immersed in kerosene Blue colour of copper sulphate solution disappear when some aluminum powder is added in it. 6. SI 2 Define the S.I unit of potential difference. Name the device used to measure potential difference. How is it connected in an electric circuit? 7. A B 2 Magnetic field lines of two magnets are shown in fig A and fig B. select the figure Page of 5

that represents the correct pattern of field lines.

Also name the poles of the magnets facing each other. 8.

a china dish for about half an hour State the change you would

Suggest a reason for this change Write balanced chemical

(iii) Solutions of barium chloride and sodium sulphate in

reaction. Identify and define the type of reaction.

A few crystals of copper sulphate are heated in a dry boiling

4 that represents the correct pattern of field lines. Give reasons for your answer. Also name the poles of the magnets facing each other. 8. A small quantity of silver chloride is kept in the sunlight in a china dish for about half an hour State the change you would observe in the colour of silver chloride. Suggest a reason for this change Write balanced chemical equation for the reaction taking place in this case (iii) Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and solution of sodium chloride. Write a balanced chemical equation for the above mentioned reaction. Identify and define the type of reaction. (iii) State the colour of barium sulphate formed. A few crystals of copper sulphate are heated in a dry boiling tube. State their colour before and after heating Give the reason of this colour change How can the orginal colour of crystals be restored? Write chemical formula of the copper sulphate so obtained. Al H 2O Page 4 of 5

Al O 2 Al HCl Complete and balance the following reaction equations.

Calculate its resistance. Six such bulbs operate for 5 hours daily.

Calculate the cost of using these bulbs if the rate is ` 6.00 per unit.

resistor. total current in the circuit. total resistance in the circuit. 4. 5.

5 Al O 2 Al HCl Complete and balance the following reaction equations. Al H 2O (steam) Al O 2 Al HCl V 00W ` 6.00 A bulb is rated at 220V; 00 W. Calculate its resistance. Six such bulbs operate for 5 hours daily. Calculate the units of electrical energy consumed per day. Calculate the cost of using these bulbs if the rate is ` 6.00 per unit.. (iii) For the circuit given below, calculate (iii) current through each resistor. total current in the circuit. total resistance in the circuit What is overloading of an electric circuit? State two conditions that can lead to overloading of a circuit. How can it to be prevented? Page 5 of 5

Blood goes only once through the heart in fishes

Name the main thinking part of the human brain.

How do these hormones bring about phototropism in

List three factors responsible for the wind.

Describe how electricity is generated at hydropower

List two advantages of producing hydroelectricity.

List four general properties of compound formed by

6 Give reasons for the following. Arteries are thick walled. Blood goes only once through the heart in fishes Plants have low energy needs. 6. Name the main thinking part of the human brain. List four major functions (other than thinking) of this part. 7. Name a plant hormone that promotes growth. How do these hormones bring about phototropism in the shoots of a plant? 8. List three factors responsible for the wind. State three limitations in harnessing wind energy. 9. Describe how electricity is generated at hydropower plants. List two advantages of producing hydroelectricity Show the formation of magnesium chloride with the help of electron dot. Name the bond formed between magnesium and chlorine. List four general properties of compound formed by such a bond. OR 2. With the help of a labelled diagram, explain the process of electrolytic refining of copper. Copper gets corroded on exposure to moist air. Name the component of air which corrodes copper. Also name the substance formed on the surface of copper. 5 Page 6 of 5

Write the chemical name and formula of each of the following.

plaster of Paris be converted into gypsum?

these uses. 22. 5 R, R 2 R 8 R State Ohm s law. Represent the law graphically.

connected in series. The following combination has an effective resistance of 8.

7 Write the chemical name and formula of each of the following. Baking soda Washing soda How does heating of baking soda help in making a cake soft and spongy? List two uses of washing soda. OR Write the chemical formula of each of the following : Plaster of paris Gypsum How can plaster of Paris be converted into gypsum? List two uses of plaster of Paris stating the property of this compound responsible for these uses R, R 2 R 8 R State Ohm s law. Represent the law graphically. Apply this law to find the combined resistance when three resistors R, R 2 and R are connected in series. The following combination has an effective resistance of 8. Calculate the value of R. OR V State Joule s law of heating and express it mathematically. Calculate the amount of heat generated when 8000 coulombs of charge is transferred in one hour through a potential difference of 50 V. Page 7 of 5

2. 5 Describe an activity to show how a changing magnetic

the A coil of insulated copper wire is connected to a

What would you observe if a bar magnet is - pushed into the

Give reasons for your answer. OR 24. What is a solenoid?

iron? 5 Draw a diagram of a nephron and label Bowman s

8 2. 5 Describe an activity to show how a changing magnetic field in one conductor induces a current in another conductor. State the rule to find the direction of induced current in the conductor. A coil of insulated copper wire is connected to a galvanometer. What would you observe if a bar magnet is - pushed into the coil held stationary inside the coil. Give reasons for your answer. OR 24. What is a solenoid? Draw the magnetic field pattern through and around a current carrying solenoid. What does the pattern of field lines inside the solenoid indicate? How can this field be utilised to magnetise a piece of soft iron? 5 Draw a diagram of a nephron and label Bowman s Capsule, Glomerulus, collecting tubule. State the purpose of making urine. Where is urine produced stored. Name the part through which urine is passed out. OR Draw a longitudinal section of human heart. Name and label the artery which carries deoxygenated blood. chamber which receives oxygenated blood from the lungs. What are capillaries? State the function performed by them. Page 8 of 5

chloride to a solution of sodium sulphate.

a yellow a transparent mixture is formed.

sulphate in a dry boiling tube, we observe

we put a drop of distilled water on it is

ph 7 7 7 7 9 When a sample of lemon juice

9 / SECTION B On adding an aqueous solution of barium chloride to a solution of sodium sulphate. We immediately observe that a colourless and odourless gas is evolved a white precipitate is formed. a yellow precipitate is formed. a transparent mixture is formed. On heating a few crystals of ferrous sulphate in a dry boiling tube, we observe that a cracking sound is produced a brown gas is evolved the colour of crystals changes a colourless and odourless gas is evolved 27. ph The colour produced on the ph paper when we put a drop of distilled water on it is green blue yellow red 28. ph 29. ph When a sample of lemon juice is tested with a ph paper, it is found to be acidic in nature. It s ph should be. more than 7 equal to 7 less than 7 between 7 and 9 Page 9 of 5

A student added a few drops of phenolphthalein to a

He observed that the colour of the solution

colourless to pink pink to blue blue to pink 0.

of copper sulphate it is observed after some time

pale green a reddish brown coating appears on the

colour of the solution changes to dark green.

sulphate appear : blue colourless pale green dark

250 V In a voltmeter there are 20 divisions between

The least count of the voltmeter is : 0.020 V 0.

0 V A B A C A D A Four identical dry cells of.

10 A student added a few drops of phenolphthalein to a solution of sodium hydroxide taken in a test tube. He observed that the colour of the solution immediately changed from : pink to colourless colourless to pink pink to blue blue to pink 0.. When some zinc granules are added to a solution of copper sulphate it is observed after some time that : the blue colour of the solution changes to pale green a reddish brown coating appears on the zinc grannules no change has taken place the blue colour of the solution changes to dark green. A freshly prepared aqueous solution of ferrous sulphate appear : blue colourless pale green dark green V V 0.25 V 0.50 V V In a voltmeter there are 20 divisions between the 0 mark and 0.5 V mark. The least count of the voltmeter is : V 0.25 V 0.50 V V..5 V / / X Y 6.0 V A B A C A D A Four identical dry cells of.5 V each were connected in four different ways as shown below. The potential difference between the points X and Y would be 6.0 V in case (s) : Page 0 of 5

5 P Q R S While performing the experiment to study

students kept the plug key in the circuit closed for

The times t and t 2 for students P, Q, R and S are

second P Q R S 0 60 60 45 The best choice of open and

R R 2 60 0 5 5 I I V V I V I To determine the

11 A and B A and C A and D A only 4. t S t t 2 t t 2 t 2 P, Q, R P Q R S P Q R S While performing the experiment to study the dependence of current on potential difference, students kept the plug key in the circuit closed for time t and open for time t 2. The times t and t 2 for students P, Q, R and S are given Closed time t Open time t 2 Student second second P Q R S The best choice of open and closed times is that of student : P Q R S 5. R R I I V V I V I To determine the equivalent resistance of a series combination of two resistors R and R 2, a student arranges the following setup. Page of 5

This circuit gives - incorrect reading for current I as well as

correct reading for current I but incorrect reading for V correct

current I correct reading for both V and I 6.

equivalent resistance of two resistors R and R 2 connected in

circuits in the three ways X, Y and Z as shown below - The

12 This circuit gives - incorrect reading for current I as well as potential difference V. correct reading for current I but incorrect reading for V correct reading for potential difference V but incorrect reading for current I correct reading for both V and I 6. R R 2 X, Y Z X Y Y Z Z X In the experiment on finding the equivalent resistance of two resistors R and R 2 connected in parallel, three students connected the voltmeter in their circuits in the three ways X, Y and Z as shown below - The voltmeter has been correctly connected in : circuits X and Y only circuits Y and Z only circuits Z and X only all the three circuits 7. (A) (B) Page 2 of 5

A B A B B A A destarched leaf of a potted plant was

experimental leaf was removed from the plant and tested

Which one of the following will be correct observation.

Whole leaf turned blue black except for area B Whole

in a leaf on exposure to sunlight, the leaf is put into

13 A B A B B A A destarched leaf of a potted plant was covered with black (A) and transparent (B) strips of paper as shown in the figure. After six hours of exposure to sunlight the experimental leaf was removed from the plant and tested for starch. Which one of the following will be correct observation. Whole leaf turned blue black except for areas A and B Whole leaf turned blue black except for area B Whole leaf turned blue black except for area A Only areas A and B turned blue black. 8. 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 : extract starch. make the leaf soft. dissolve chlorophyll. extract glucose. 9. Page of 5

While preparing temporary mount of leaf peel to observe stomata,

tissues wet give colour to the tissue make the mount more

B C A B A, B C A D A student had drawn the diagram of stomata

Below are given some correction needed in the diagram.

one nucleus only. Chloroplasts should be drawn in the guard cells.

14 While preparing temporary mount of leaf peel to observe stomata, Glycerine is added to : allow entry of air bubbles keep the tissues wet give colour to the tissue make the mount more attractive. 40. B C A B A, B C A D A student had drawn the diagram of stomata from the temporary stained mount of leaf peel. Below are given some correction needed in the diagram. Shape of guard cells need correction Epidermal cells should have one nucleus only. Chloroplasts should be drawn in the guard cells. More nucleus are to be drawn in the guard cells. Actually needed corrections in the diagram are B and C A and B A, B and C A and D 4. CO 2 KOH KOH Page 4 of 5

KOH KOH A student while setting up the experiment to show that CO 2 is evolved

The changes that should be made in the set up to get the desired results is :

Water should be taken in the flask and KOH solution in the small test tube. 42.

release carbon dioxide during respiration.

15 KOH KOH A student while setting up the experiment to show that CO 2 is evolved during respiration, committed some errors shown in the figure. The changes that should be made in the set up to get the desired results is : KOH should be taken in the small test tube inside the flask and germinating seeds in beaker. KOH solution should be taken in the small test tube inside the flask and water should be taken in the beaker. Water should be taken in the beaker and KOH solution in the flask. Water should be taken in the flask and KOH solution in the small test tube. 42. CO 2 CO 2 CO 2 KOH CO 2 An apparatus was set up to show that germinating seeds release carbon dioxide during respiration. Select the observation out of the following which confirms that CO 2 is released during respiration. Carefully observe if there is any change in the size of germinating seeds. See if the KOH in the test tube has absorbed CO 2 released by germinating seeds. Check if the level of water in the delivery tube dipped in beaker has risen. Check if CO 2 is coming into the delivery tube. - o O o - Page 5 of 5

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

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