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Important Instructions for the

School Principal

(Not to be printed with the question paper)

1) This question paper is strictly meant for use in school based SA-I, September-2012 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.

3) 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-2012, 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.

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I, 2012

SUMMATIVE ASSESSMENT – I, 2012

/ SCIENCE

X / Class – X

3 90

Time allowed : 3 hours Maximum Marks : 90

(i)

(ii)

(iii)

(iv)

(v) 1 3

(vi) 4 7 30

(vii) 8 19 50

(viii) 20 24 70

(ix) 25 42

General Instructions :

(i) The question paper comprises of two Sections, A and B. You are to attempt both the

sections.

(ii) All questions are compulsory.

(iii) 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.

(iv) All questions of Section-A and all questions of Section-B are to be attempted separately.

(v) Question numbers 1 to 3 in Section-A are one mark questions. These are to be answered in

one word or in one sentence.

(vi) Question numbers 4 to 7 in Sections-A are two marks questions. These are to be answered

in about 30 words each.

(vii) Question numbers 8 to 19 in Section-A are three marks questions. These are to be answered

in about 50 words each.

(viii) Question numbers 20 to 24 in Section-A are five marks questions. These are to be answered

in about 70 words each.

(ix) 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.

SC2-063

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SECTION-A

1.

What happens to magnitude of magnetic field when current flowing through a conductor increases ?

1

2.

Name the hormones secreted by Ovary and Testis.

1

3.

List two non-renewable sources of energy.

1

4.

(a)

(b)

(c)

(d)

Identify the type of each of the following reactions : (a) A reaction in which a single product is formed from two or more reactants. (b) The reaction mixture becomes warm. (c) An insoluble substance is formed. (d) External surface of the container in which reaction takes place becomes freezing cold.

2

5.

Distinguish between Calcination and Roasting, giving chemical equations for each.

2

6. SI

Define the SI unit of resistance. Write the function of rheostat in an electric circuit.

2

7.

(a)

(b)

(c)

(d)

What happens to the force acting on current carrying conductor placed in magnetic field when : (a) Current in conductor increases. (b) Length of the conductor increase. (c) Direction of the current and magnetic field both are reversed. (d) Direction of the current is reversed without changing the direction of magnetic field.

2

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8.

Define rancidity. To prevent rancidity of foods containing fats or oils, some substances are added to them. What are these substances called ? Suggest some other methods to prevent rancidity of food items.

3

9.

MnO2 HCl → MnCl2H2OCl2

Define redox reactions. Identify the substance oxidised and the substance reduced in the following redox reaction : MnO2 HCl → MnCl2H2OCl2 Also balance the given equation.

3

10.

Demonstrate by an experiment that acid reacts with metal carbonate to liberate carbondioxide gas.

3

11. (a)

Cu, Ca, Mg, Na, Zn, Al

(b)

(a) Arrange the following metals in decreasing order of their reactivity : Cu, Ca, Mg, Na, Zn, Al (b) You are provided with four metals-sodium, Magnesium, Aluminium and copper. Using only water as the reactant , how will you identify each one of them ?

3

12. 110 V 5 A

220 V

The potential difference between the terminals of an electric heater is 110 V, when it draws a current of 5 A from the source. What current will the heater draw and what will be its wattage if the potential difference is increased to 220 V. Consider that the resistance of the heater element does not change with temperature.

3

13.

Two wires made of copper and nichrome have equal lengths and equal resistance. Which

is thicker ? The resistivity of nichrome is greater than resistivity of copper. Why are

alloys commonly used in electrical heating devices such as electric toasters, electric iron

etc. ?

3

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14.

(a)

(b)

(c)

A galvanometer is connected to a coil of insulated copper wire. What will happen if a bar magnet is : (a) inserted into the coil. (b) withdrawn from inside the coil. (c) held stationary inside the coil.

3

15.

List three events that occur during photosynthesis.

3

16.

(i) (ii) (iii) (iv)

Draw diagram of a neuron and label the following parts : (i) Cell body (ii) Nucleus (iii) Dendrites (iv) Axon .

3

17.

(i) A B

(ii)

Study the given diagram and answer the questions that follow :-

(i) Name the parts A and B . (ii) What does the above set up depict.

3

18.

“ Bio gas is an excellent fuel.” List three reasons to justify this statement.

3

19.

How is nuclear energy generated ? Give one use of nuclear energy .

3

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20. (a)

(b)

0.05%

(i)

(ii)

(iii)

(a) Why do metals high up in the reactivity series not reduced by heating with carbon ? What is the reduction process used for sodium chloride . (b) A metal is slowly eaten away in the presence of air and water. To avoid this, it is mixed with carbon (0.05%) or nickel and chromium. (i) Identify the metal. (ii) What is the substance formed on mixing carbon ? (iii) State another method that can be used to protect the metal.

OR

Draw flow chart to show extraction of metals of medium and high reactivity from their ores .

5

21. (a)

(b)

(c) (HCl) (NaOH)

H2

(a) What are olfactory indicators . Give an example (b) Name two naturally occurring acids and mention their source (c) Zinc reacts with HCl and NaOH both to produce H2 gas. Write balanced equation for both reactions.

OR

(a)

(b)

(c)

(d)

(e)

Give reasons : (a) Acid must be added to water and not vice versa during dilution. (b) Solution of sulphuric acid conducts electricity whereas alcohol does not . (c) Cakes rise on adding baking powder. (d) Dry ammonia gas has no action on litmus paper but a solution of ammonia in water turns red litmus paper blue. (e) Tartaric acid is an ingredient of baking powder.

5

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22. SI

1.4 V

0.35A

Define SI unit of current. Name the instrument used to measure electric current. How is it connected in electric circuit ? List two characteristics of the material used in electric heating devices. Find the resistance of a conductor if the current flowing through it is 0.35 A, when a potential difference across its end is 1.4 V.

OR

SI R

V P (kWh)

1 kWh

Define SI unit of power. Derive the expression for power P, consumed by a device having resistance R and potential difference V . What is meant by kilowatt hour (kWh) . Convert 1 kWh into joules.

5

23.

What are magnetic field lines ? Describe an activity to demonstrate how magnetic field lines of a bar magnet are drawn using compass needle. List three characteristics of magnetic field lines.

OR

Describe an activity to draw the magnetic field lines around a straight current carrying conductor. Name and state the rule to find the direction of the magnetic field produced in this case.

5

24. (i)

(a) (b)

(c) (d)

(ii)

(i) Draw a diagram of human alimentary canal and label the following parts. (a) Oesophagus (b) Liver (c) Small intestine (d) Pancreas (ii) Give reason. Bile does not contain any enzyme but it is essential for digestion .

OR

(i)

(a) (b)

(c) (d)

5

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(ii)

(i) With the help of a schematic diagram, show the transport and exchange of oxygen and carbon dioxide in human heart. Label the following parts : (a) Pulmonary artery (b) Pulmonary vein (c) Vena Cava from upper body (d) Aorta (ii) Give reason - “ The separation of the right side and left side of the heart is useful to keep oxygenated and deoxygenated blood from mixing.

/ SECTION - B

25.

(a) (b)

(c) (d)

The precipitate formed when aqueous solutions of Sodium Sulphate and Barium Chloride are mixed is of : (a) Barium sulphide (b) Sodium sulphide (c) Sodium chloride (d) Barium sulphate

1

26. CuSO4 CuSO4

(a) (b)

(c) (d)

When we dip an iron strip in aqueous solution of CuSO4 the blue colour of the solution is

gradually changed to pale green . The reaction represents : (a) Decomposition reaction (b) Combination reaction (b) Displacement reaction (d) Double displacement reaction

1

27. pH

(a) (b)

(c) (d)

Two colours seen at the extreme ends of a pH chart are: (a) Red and green (b) Green and blue (c) Red and orange (d) Red and blue

1

28. pH pH

pH pH

(a) (b) (c) (d)

A student tested the pH of distilled water and found that the colour of pH paper changed to green and when he checked the pH again after dissolving a pinch of common salt in it , the colour of pH paper this time was: (a) yellow (b) red (c) green (d) blue

1

29.

(a) (b) (c) (d)

Zn metal in the laboratory for doing experiments is available in the form of

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(a) filings (b) turnings (c) granules (d) pellets

30. 15

(a) (b) (c) (d)

When an iron strip is dipped in aqueous solution of zinc sulphate, the solution after 15 minutes appears: (a) light blue (b) pale green (c) colourless (d) light pink

1

31. 15

(a) (b)

(c) (d)

An iron nail is placed in a beaker containing copper sulphate solution. After 15 minutes a deposit is formed on the iron nail. The colour of the deposit on the nail and that of the solution respectively are : (a) blue and pale green (b) reddish brown and blue (c) reddish brown and pale green (d) blue and reddish brown

1

32. 0 0.5 20

(a) 0.020 A (b) 0.025 A (c) 0.050 A (d) 0.250 A In an ammeter there are 20 divisions between 0 mark and 0.5 mark. The least count of the ammeter is : (a) 0.020 A (b) 0.025 A (c) 0.050 A (d) 0.250 A

1

33. (I) (V)

(V) (I)

(a) I (b) II

(c) III (d) IV

In the experiment on studying the dependence of current (I) on the potential difference (V), students plotted the following graphs between (V) and (I) as per their respective observations :

1

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The observations likely to be correct are that of: (a) student I (b) student II (c) student III (d) student IV

34.

(a) (b)

(c) (d)

Which two circuit components are connected in parallel in the following circuit diagram :

(a) Rheostat and Voltmeter (b) Voltmeter and Ammeter (c) Voltmeter and Resistor (d) Ammeter and Resistor

1

35.

X, Y Z

(a) X Y (b) Y Z

(c) Z X (d)

In the experiment on finding the equivalent resistance of the two resistors, connected in

1

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parallel, three students connected the voltmeter in their circuits, in three different ways, X,Y and Z shown below :-

The voltmeter has been correctly connected in : (a) cases X and Y only (b) cases Y and Z only (c) cases Z and X only (d) all the three cases

36.

(a) I (b) II (c) III (d) IV In the experiment on finding the equivalent resistance of two resisters, connected in series, the circuit components are correctly connected only in one circuit which one is it ?

(a) I (b) II (c) III (d) IV

1

37.

(a) (b)

(c) (d)

What will happen if a potted green plant is kept in a dark place ? (a) Photosynthesis will be slow. (b) Photosynthesis will stop (c) Photosynthesis will increase (d) Photosynthesis will take place in intervals.

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38. 1

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I, II III

/ /

(a) I (b) II (c) I III (d) II III

Given below is a sketch of a leaf partially covered with black paper, which is to be used in the experiment to show that light is necessary for the process of photosynthesis. At the end of the experiment the part/parts of the leaf labelled I,II, and III that will become blue black, when dipped in iodine solution is / are:

(a) I only (b) II only (c) I and III (d) II and III

39. I, II, III IV

(a) I (b) II (c) III (d) IV Which structure out of I,II,III, and IV should be marked as stoma in the given diagram of epidermal peel of leaf?

(a) I (b) II (c) III (d) IV

1

40.

(a)

(b)

(c)

(d)

When the guard cells are observed under high power microscope, the following structures are visible. (a) vacuole with violet pigment (b) chloroplast containing violet pigments

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(c) vacuole filled with chlorophyll pigments (d) chloroplast containing chlorophyll pigments

41. CO2

(a) (b)

(c) (d)

The plant material used to demonstrate the CO2 released during respiration is (a) A potted plant with green leaves (b) Detached green leaves (c) A plant with variegated leaves (d) Germinating seeds

1

42. A B A

B

(a) A

(b) B

(c)

(d) B

Using the same number of given germinating seeds two students A and B set up the experiments separately. Student A used a cotton plug to hold the bent tube in the mouth of the flask while student B used a rubber cork as shown in the following diagrams.

After 4 hours, they noticed that (a) Water level increased in the bent tube of A (b) Water level increased in the bent tube of B (c) The cotton plug was wet (d) The water in the beaker of B turned milky

1

- o O o -