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 4

2 I, 202 SUMMATIVE ASSESSMENT I, 202 / SCIENCE SC2-049 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 4

. 50Hz SECTION-A An alternating current has a frequency of 50Hz. How many times does it change its direction in one second? 2.

Fe H 2O Fe O 4 H 2 State the law which is followed in balancing a chemical equation.

2 2 State the factors on which the heat produced in a current carrying conductor depends. Give one practical application of this effect. 7.

3 . 50Hz SECTION-A An alternating current has a frequency of 50Hz. How many times does it change its direction in one second? 2.. Name the part of neuron through which the information travels as an electric impulse. List two forms of energy harnessed from the oceans Fe H 2O Fe O 4 H 2 State the law which is followed in balancing a chemical equation. Balance the following chemical equation : Fe H 2O Fe O 4 H 2 Al 2O HCl Na 2O H 2O Write chemical equation for the reaction between : Al 2O and HCl Na 2O and H 2O 2 2 State the factors on which the heat produced in a current carrying conductor depends. Give one practical application of this effect. 7. AB I 2 AB is a thick copper wire. When electric current I flows through the wire, what change is observed in the compass needle placed near the wire? Give reason for this observation. State the change that would be observed if the direction of electric current in the wire is reversed. 8. (iii) Page of 4

Name the type of reaction and the name of

Some crystals of ferrous sulphate are heated

shirt. You immediately scrub it with soap.

) combine with atoms of chlorine (At. No.

4 9. 0. A white powder is a compound of calcium and when water is added to it. a large amount of heat is liberated. Identify the compound and write its formula. Name the type of reaction and the name of the product formed. (iii) Write chemical equation for the reaction. Some crystals of ferrous sulphate are heated in a dry boiling tube. State any two observations. Write the names of all the products formed. Name the type of reaction. While eating food, you happen to spill some curry on your white shirt. You immediately scrub it with soap. What happens to its yellow colour on scrubbing with soap? Why? What happens to this stain when the shirt is washed with plenty of water? Atoms of sodium (At. No. ) combine with atoms of chlorine (At. No. 7) to form sodium chloride. Name the bond formed between sodium and chloride atoms and write the formula of sodium chloride. Show the formation of sodium chloride with the help of electron dot. 2 2 kw ` 6.00 Define electric power. An electric motor is rated at 2 kw. Calculate the cost of using it for 2 hours daily for the month of September if each unit costs ` A B, 22, 220 V (iii) Page 4 of 4

A hot plate connected to a 220 V line has two resistance coils A and B, each of 22 resistance.

6. Name the three types of wires used in household circuits.

State the colour of insulation used for this wire. How it ensures the safety of the user?

Veins have valves. 7. 8. Draw a diagram of human brain and label cerebrum, cerebellum, medulla and forebrain on it.

5 A hot plate connected to a 220 V line has two resistance coils A and B, each of 22 resistance. Calculate the amount of electric current flowing when these coils are : used individually. connected in series. (iii) connected in parallel Name the three types of wires used in household circuits. Out of these three which wire is used as a safety measure especially for those appliances that have metallic body. State the colour of insulation used for this wire. How it ensures the safety of the user? Give reasons for the following : Trachea never collapse Rate of breathing is higher in aquatic animals as compared to terrestrial animals. Veins have valves Draw a diagram of human brain and label cerebrum, cerebellum, medulla and forebrain on it. List in tabular form three differences between nervous control and chemical control. 9. Biogas is better fuel than animal dung cakes. Justify this statement stating three reasons. 20. State the energy transformation taking place at hydropower plants. List two advantages of setting up hydropower plants. 5 What is an alloy? Why and how is an alloy prepared? Give the name and composition of any one alloy. Page 5 of 4

6 OR What is thermit reaction? Write a chemical equation for thermit reaction. State two categories in which you can classify this reaction. For what this reaction is used and why? 2. (iii) (iii) 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. OR 5 (iii) Rahul has been stung by a honey bee and is in great pain. What could be the reason for this burning pain? State the type of chemical compound that can be applied on the affected area to give relief to Rahul? Write the name and formula of each of the following : an acidic salt a basic salt (iii) a neutral salt 22. V I (I) V I (V) 5 Page 6 of 4

Describe an activity to find relationship between the potential difference (V)

including in your answer : the diagram of the electric circuit. a V I graph.

0 mm 2 5 0 8 m Define resistance of a conductor.

Name the device which is often used to change the resistance without changing the

Calculate the resistance of 50 m length of wire of cross sectional area 0.

5 Draw the pattern of magnetic field lines through and around a current carrying

State how this field be utilised to make an electromagnet.

OR Describe an activity to show how a changing magnetic field in one conductor

7 Describe an activity to find relationship between the potential difference (V) across two ends of a conductor and the current (I) flowing through it by including in your answer : the diagram of the electric circuit. a V I graph. Also state the law that gives the relationship between V and I. OR 50 m 0.0 mm m Define resistance of a conductor. State the factors on which resistance of a conductor depends. Name the device which is often used to change the resistance without changing the voltage source in an electric circuit. Calculate the resistance of 50 m length of wire of cross sectional area 0.0 square mm and of resistivity m Draw the pattern of magnetic field lines through and around a current carrying solenoid. What does the magnetic field pattern inside the solenoid indicate? State how this field be utilised to make an electromagnet. List two ways by which strength of this electromagnet can be increased. OR 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? Page 7 of 4

8 24. 5 What is double circulation? Why is it found in birds and mammals and not in fishes? How is oxygen and carbon dioxide transported in blood? OR With the help of labelled diagram explain nutrition in amoeba. 25. / SECTION B On mixing the aqueous solutions of barium chloride and sodium sulphate, a student would immediately observe that a colourless gas is evolved brown fumes are formed a transparent solution is formed a white precipitate is formed g In a beaker, 5 g of calcium oxide (quick lime ) is mixed with some water. It is observed that : it dissolve completely it does not dissolve at all it is sparingly soluble it forms a transparent mixture 27. ph Blue colour is produced on a ph paper when a drop of sodium carbonate solution is placed on it. The nature of sodium carbonate should be : slightly acidic strongly acidic neutral basic 28. ph Page 8 of 4

a ph paper, the colour produced on it is : green

to a solution of sodium hydroxide, it changes its

colourless colourless to pink Some crystal of

The colour of the solution is : pale green blue

A B A B A B A B B Solution A is copper sulphate

To each, some aluminium powder is added.

does not both A and B become colourless no change

9 When a few drops of distilled water are placed on a ph paper, the colour produced on it is : green yellow orange red When phenolphthalein is added to a solution of sodium hydroxide, it changes its colour from : pink to blue blue to red pink to colourless colourless to pink Some crystal of ferrous sulphate are dissolved in water. The colour of the solution is : pale green blue dark green brown. A B A B A B A B B Solution A is copper sulphate and B is ferrous sulphate. To each, some aluminium powder is added. After some time : solution A changes colour but B does not both A and B become colourless no change occur in either A or B a colour change occurs only in solution B 2. ma 2 m A 25 ma 00 ma The least count of the milliameter shown below is : ma 2 m A 25 ma 00 ma Page 9 of 4

10 ..5 V 4 6 V P Q R S Four students connected identical cells ( 4 in number) of.5 V to form a battery of 6 V as shown below. The correct set up is that of student. P Q R S A 0 Page 0 of 4

11 The voltmeter, ammeter and resistor in the circuit shown have been checked to be correct. On plugging the key, the ammeter reads 0.9 A but the voltmeter reads 0. This could be because : The range of the voltmeter is more than twice the battery voltage The least count of voltmeter is too high The wires joined to the voltmeter terminals are loose The voltmeter is incorrectly placed in the circuit. 5. To determine the equivalent resistance of two resistors when connected in series, a student arranged the circuit components as shown below. But he did not succeed to achieve the objectives. Page of 4

12 The mistake committed by him in setting up the circuit is : Position of ammeter is incorrect Position of voltmeter is incorrect Terminals of voltmeter are wrongly connected Terminals of ammeter are wrongly connected 6. R R 2 A B C D The correct set up for determining the equivalent resistance of two resistors R and R 2 when connected in parallel is : A B C D 7. Page 2 of 4

In an experiment to show that sunlight is necessary for photosynthesis,

It is essential because alcohol is highly volatile steam from the water

13 In an experiment to show that sunlight is necessary for photosynthesis, the leaf is boiled in alcohol for a few minutes using a water bath. It is essential because alcohol is highly volatile steam from the water bath heats the leaf rapidly steam from the water bath dissolves the chlorophyll alcohol is flammable 8. A B B C A, B C Above observations were made after testing the leaf for the presence of starch. The inference that can be drawn from it is that the photosynthesis has occurred in : portion A only portion B only portions B and C all the portions A, B and C Page of 4

14 9. If we intend to observe open stomata in a temporary stained mount of leaf peel, the leaf should preferably be taken from a plant growing in : in shade in sunlight in water in the dark room 40. A temporary mount of leaf epidermal peel stained in safranin and mounted in glycerine when viewed under a high power microscope appears Blue Blue Black Yellowish brown Pink 4. CO 2 (A) (B) (C) (D) KOH A B B C A, B D B D In a set up to study CO2 is released during respiration, the water level did not rise in the delivery tube. Which of the following could be the reasons? (A) The conical flask is not air tight (B) Germinating seeds are dry (C) Water is not coloured (D) KOH is not fresh A and B B and C A, B and D B and D 42. CO 2 The small test tube suspended inside the flask during the experiment to study CO 2 is released during respiration contains Potassium chloride Sodium hydroxide Calcium hydroxide Potassium hydroxide - o O o - Page 4 of 4

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