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 7

2 I, 202 SUMMATIVE ASSESSMENT I, 202 / SCIENCE SC2-06 X / Class X 90 Time allowed : hours Maximum Marks : 90 (iv) (v) (vi) (vii) (viii) (ix) General Instructions : (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 7

gustatory and of olfactory receptors are

Name the two major components present in

produce carbon dioxide Give reason for the

temperature the resistance of a cylindrical

3 . A.C D.C SECTION-A List any one point of difference between AC and DC Mention the part of the body where gustatory and of olfactory receptors are located. Name the two major components present in the left-over slurry of a bio gas plant Write the skeletal equation for the following reactions : Hydrogen sulphide reacts with sulphur dioxide to form sulphur and water. Methane on burning combines with oxygen to produce carbon dioxide and water. Give reason for the following : Metals are good conductors of electricity whereas non-metals are not. Ionic compounds have usually high melting and boiling points. SI State the factors on which at a given temperature the resistance of a cylindrical conductor depends. State the SI unit of resistivity. Explain the terms : overloading and short-circuiting PbO C Pb CO 2 MnO 2 4HCl MnCl 2 2H 2 O Cl 2 What is redox reaction? Identify the substance oxidised and the substance reduced in the following reactions : 2 Pb O C Pb CO 2 MnO 2 4HCl MnCl 2 2H 2 O Cl 2 Page of 7

9. The smell and taste of food containing

in the preparation of bleaching powder and

gold is found in free state in nature. Why?

of an alloy rather than of a pure metal.

4 9. The smell and taste of food containing fats and oils changes after sometime. Why does this happen? Name the process. List two ways which help to slow down the above mentioned process. 0. Write the chemical formula of bleaching powder? Write balanced chemical equation involved in the preparation of bleaching powder and write its three uses.. 2. Define mineral, ore. Aluminium occurs in combined state whereas gold is found in free state in nature. Why? Explain the following : The elements of electric heating devices such as bread-toasters and electric iron are made of an alloy rather than of a pure metal. Series arrangement is not used for domestic circuits. Copper and aluminium wires are usually employed for electricity transmission.. Page 4 of 7

5 Find out the reading of ammeter and voltmeter in the circuit given below : 4. With the help of a diagram, describe an activity to draw the magnetic field lines around a coil carrying current. 5. List the three kinds of blood vessels of human circulatory system and write their functions in tabular form. 6. How is brain protected from injury and shock? Name two main parts of hind brain and state the function of each. 7. Explain how the human body responds when adrenaline is secreted into the blood. 8. Draw a schematic diagram of a bio-gas plant. Write any two advantages of obtaining biogas from animal dung and bio-wastes. 9. Name the device used to convert : Solar energy into heat Solar energy into electricity Mention two limitations of solar energy Page 5 of 7

List two differences between calcination and

Which method will you use to reduce the following?

oxides of less reactive metals oxides of

reactive metals /OR Write the names and symbols

Explain by drawing electronic structure how any

State any four physical properties of the

'X' X 5 X HCl Dry pellets of a base 'X' when kept

The compound is also formed by chlor-alkali

Describe chlor-alkali process with balanced

Name the type of reaction occurs when X is

Write the While diluting an acid, why is it

6 List two differences between calcination and roasting in tabular form. Which method will you use to reduce the following? Explain by giving a suitable example. oxides of less reactive metals oxides of moderately reactive metals oxides of highly reactive metals /OR Write the names and symbols of two most reactive metals. Explain by drawing electronic structure how any one of the two metals react with a halogen. State any four physical properties of the compound formed. 2. 'X' X 5 X HCl Dry pellets of a base 'X' when kept in open absorbs moisture and turns sticky. The compound is also formed by chlor-alkali process. Write chemical name and formula of X. Describe chlor-alkali process with balanced chemical equation. Name the type of reaction occurs when X is treated with dilute hydrochloric acid. Write the chemical equation. While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid? /OR ph Bee sting leaves a chemical substance that causes pain and irritation. Name the chemical substance. Identify the type of substance which may give relief on the stung area when applied on it. Mention the ph value below which tooth decay begins. How this fall below this value? Explain the ill effect of the acidic medium in the Page 6 of 7

connected in series in parallel, inturn to a

Calculate the ratio of power consumed in the

What combination is used for connecting in the

expression for the equivalent resistance of

A coil of insulated copper wire is connected to

7 mouth. How can this be prevented? What are strong acids and weak acids? Give an example of each V What is meant by the statement that the resistance of a wire is? Two identical resistors each of resistance 2 are connected in series in parallel, inturn to a battery of 6 V. Calculate the ratio of power consumed in the combination of resistors in the two cases. What combination is used for connecting in the circuit to measure the potential difference across two points? R, R 2 R /OR A, 5A 0A 220 V kw Derive an expression for the equivalent resistance of three resistors R, R 2 and R connected in series. Fuse of A, 5A and 0A are available. Calculate and select the fuse for operating electric iron of kw power at 220 V line State Fleming s left hand rule. A coil of insulated copper wire is connected to a galvanometer. What happens if a bar magnet is : pushed into the coil withdrawn from inside the coil held stationary inside the coil Give reasons for your observation. Mention one more method of inducing current in a coil. Page 7 of 7

/OR How will the magnetic field around a

changing the direction of flow of current

Describe an activity with diagram to draw

organisms much faster than in terrestrial

which stores the urine part which connects

8 /OR How will the magnetic field around a current carrying straight conductor be affected on : increasing the current through the conductor? changing the direction of flow of current in the conductor? Describe an activity with diagram to draw magnetic field lines due to a current carrying circular loop. State the rule used to find the direction of magnetic field due to a current carrying circular loop. 24. (iv) Draw a diagram of human respiratory system and label the following : part where air is filtered by fine hair and mucus part which terminates in balloon like structures balloon like structures where exchange of gases takes place. (iv) part which separates chest cavity from abdominal cavity. Why is the rate of breathing in aquatic organisms much faster than in terrestrial organisms? /OR (iv) 5 Draw a diagram of human excretory system and label the following : part in which urine is produced part which stores the urine part which connects and (iv) part from which urine is passed out. Name the factors on which the amount of water reabsorbed along the tubular part of nephron depend on? Page 8 of 7

> Cu In an experiment each of the metals Al, Zn, Cu and Fe are reacted with ZnSO 4, CuSO 4, Al 2 (SO 4 ) and FeSO 4, solutions.

9 / SECTION - B 25. Al, Zn, Cu Fe Zn SO 4, CuSO 4, Al 2 (SO 4 ) FeSO 4 Х Metal Zn SO 4 Cu SO 4 Al 2 (SO 4 ) Fe SO 4 Zn Х Х Cu Х Х Х Х Al Х Fe Х Х Х Zn > Fe > Al > Cu Al > Fe > Zn > Cu Zn > Al > Fe > Cu (d) Al > Zn > Fe > Cu In an experiment each of the metals Al, Zn, Cu and Fe are reacted with ZnSO 4, CuSO 4, Al 2 (SO 4 ) and FeSO 4, solutions. The results are tabulated as follows where means that the reaction occurs and Х means no reaction occurs. Metal Zn SO 4 Cu SO 4 Al 2 (SO 4 ) Fe SO 4 Zn Х Х Cu Х Х Х Х Al Х Fe Х Х Х On the basis of the above result the order of the reactivity of the metals may be concluded as : Zn > Fe > Al > Cu Al > Fe > Zn > Cu Zn > Al > Fe > Cu (d) Al > Zn > Fe > Cu Al 2 (SO 4 ) Cu SO 4 Fe SO 4 (d) Zn SO 4 Some iron nails were dropped in an unknown solution taken in a beaker and left for 0 minutes. It was then observed that a brown coating is formed on nails. The solution is of : Al 2 (SO 4 ) Cu SO 4 Fe SO 4 (d) ZnSO A B ph A B (d) Bottle A contains acetic acid and bottle B contains sodium carbonate solution. When ph paper is dipped in each of the solution, the colour seen in A and B respectively will be : blue, orange orange, green orange, blue (d) green, blue Page 9 of 7

10 28. X,Y,Z X Y Z ph X, Y, Z Z, X, Y Y, X, Z (d) Z, Y, X On adding a few drops of universal indicator to three unknown colourless solutions (X), (Y) and (Z) taken separately in three test tubes shown in the following diagrams, a student observed the changes in colour as green in (X), red in (Y) and violet in (Z). Arrangement of solution in the decreasing order of ph is : X, Y, Z Z, X, Y Y, X, Z (d) Z, Y, X ml HCl 0 ml NaOH I II II I (d) I II 0 ml of HCl and 0 ml of NaOH solutions are contained in two separate beakers labeled I and II respectively. On adding zinc granules to both, it is observed that at room temperature : gas is evolved in beaker II but not in beaker I no gas is evolved in either of the two beakers gas is evolved vigorously in both (d) gas is evolved vigorously in beaker I but not so in beaker II. 0. Page 0 of 7

(d) Solutions of ferous sulphate, zinc sulphate, copper

four test tubes and some iron nails were placed in each of

After few minutes, it would be observed that the colour of

aluminium sulphate changed and that of ferous sulphate did

Solutions of zinc sulphate and aluminium sulphate only

Copper sulphate solution only changed (d) All the four

containing solutions are shown along with colours.

11 (d) Solutions of ferous sulphate, zinc sulphate, copper sulphate and aluminium sulphate were separately taken in four test tubes and some iron nails were placed in each of the solutions. After few minutes, it would be observed that the colour of : Solutions of zinc sulphate, copper sulphate and aluminium sulphate changed and that of ferous sulphate did not change. Solutions of zinc sulphate and aluminium sulphate only changed. Copper sulphate solution only changed (d) All the four solutions changed. FeSO 4 (II) III I (d) IV Four test tubes containing solutions are shown along with colours. FeSO 4 is contained in : (II) III I (d) IV (d) 0.2 The readings of current flowing through a conductor and the potential difference across its two ends are shown in the ammeter and voltmeter given below. The Page of 7

resistance of the conductor would be : 20

12 resistance of the conductor would be : (d) 0.2. I II I 2V II 0 V 0 V 2 V (d) I 0 V II 2 V For the circuits shown in figures I and II, the voltmeter reading would be : (d) 2V in circuit I and 0 V in circuit II 0 V in both circuits 2V in both circuits 0 V in circuit I and 2V in circuit II A 27 A 0. A (d) 0.0 A An ammeter has a range of (0-5A) ampere and there are 50 divisions on its scale. What is its least count? 0 A 27 A 0. A (d) 0.0 A Page 2 of 7

13 5. A B R R 2 A b c B d 2 c 2 X Y A B A B (d) A B Two students (A) and (B) connected their two given resistors R and R 2 in the manners shown below : Student A connects the terminals marked b and c while B connects the terminals marked d 2 and c 2 in their respective circuits at the points marked X and Y. Page of 7

The equivalent resistance measured by A and B will be : of series combination of the two resistors. of the parallel combination of the two resistors.

14 The equivalent resistance measured by A and B will be : of series combination of the two resistors. of the parallel combination of the two resistors. of series combination for student A while parallel combination of the two resistors for B. (d) of the parallel combination for A while of the series combination of the two resistors for B. 6. I i V II i 2 V 2 i > i 2 ; V = V 2 i > i 2 ; V > V 2 i < i 2 ; V = V 2 (d) i < i 2 ; V < V 2 In figures given below : Circuit I : ammeter reads current i and voltmeter reads V. Page 4 of 7

Circuit II : ammeter reads current i 2 and voltmeter reads V 2.

> V 2 i < i 2 ; V = V 2 (d) i < i 2 ; V < V 2 7.

covered with (A) black strip and (B) transparent strip of paper as

After 6 hours of exposure to sunlight, the leaf was removed from the

Which of the following will be the correct observation?

15 Circuit II : ammeter reads current i 2 and voltmeter reads V 2. The relation between the readings is : i > i 2 ; V = V 2 i > i 2 ; V > V 2 i < i 2 ; V = V 2 (d) i < i 2 ; V < V A B (B) (A) (B) (d) (A) A distarched leaf on a potted plant was covered with (A) black strip and (B) transparent strip of paper as shown in the diagram. After 6 hours of exposure to sunlight, the leaf was removed from the plant and tested for starch. Which of the following will be the correct observation? Whole leaf turned blue-black. Only (B) portion turned blue-black. Only (A) and (B) portions remained colourless and the rest of the leaf turned blue-black. (d) Only (A) portion remained colourless. Page 5 of 7

8. (d) Which one of the following is the combination of

experiment to show that light is necessary for

Destarched leaves, strips of black paper, starch

A potted plant, strips of coloured paper, starch

Destarched potted plant, strips of black paper, starch

(d) Destarched potted plant, strips of black paper and

(d) Cover slip is put on the slide containing the leaf

crushing of material oozing of glycerine (d) oozing of

(d) The inner walls facing the stomatal aperture, of

16 8. (d) Which one of the following is the combination of the relevant materials required for setting up an experiment to show that light is necessary for photosynthesis? Destarched leaves, strips of black paper, starch solution and iodine crystal. A potted plant, strips of coloured paper, starch solution, iodine and potassium iodide. Destarched potted plant, strips of black paper, starch solution and potassium iodide. (d) Destarched potted plant, strips of black paper and iodine solution. 9. (d) Cover slip is put on the slide containing the leaf peel very gently to avoid : entry of air bubbles crushing of material oozing of glycerine (d) oozing of stain 40. (d) The inner walls facing the stomatal aperture, of guard cells are : thin and the outer walls are thick thick and the outer walls are thin thick and the outer walls are also thick (d) thin and the outer walls are also thin 4. CO 2 (d) To show that CO 2 is released during respiration, we take dry seeds boiled seeds Page 6 of 7

germinating seeds (d) wet seeds 42. CO 2 KOH KOH KOH (d) KOH A student while setting up the experiment to show that CO 2 is given out during respiration made some errors shown in the diagram.

17 germinating seeds (d) wet seeds 42. CO 2 KOH KOH KOH (d) KOH A student while setting up the experiment to show that CO 2 is given out during respiration made some errors shown in the diagram. What changes should be made in the set up to get the desired results? KOH solution should be taken in the small test tube inside the flask and germinating seeds in the beaker. Water should be taken in the beaker and KOH solution in the flask. KOH solution should be taken in the small test tube inside the flask and water should be taken in the beaker. (d) Water should be taken in the flask and KOH solution in the small test tube. - o O o - Page 7 of 7

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