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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.

SC2-060

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SECTION-A

1.

A positively charged particle projected towards west is deflected towards north by a magnetic field. State the direction of magnetic field.

1

2.

What is meant by chemotropism ?

1

3.

Write any two constituents of Bio-gas ?

1

4.

→

Write balanced chemical equation for the following reaction stating the physical

state of the reactants and the products.

Barium chloride Aluminium sulphate

→ Barium sulphate Aluminium chloride

2

5.

Explain with an example. Carbonate and sulphide ores are converted into their oxides prior to reduction during the process of extraction.

2

6.

Copper is used for electrical transmission lines where as tungsten is used

exclusively for filaments of electrical bulbs. Why ?

2

7.

Draw the patterns of magnetic field lines due to a bar magnet. The magnetic

field lines are closed curves. Why ?

2

8.

Define the term decomposition reaction. White silver chloride turns grey in

sunlight why ? Write the balanced chemical equation for the reaction involved.

3

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9.

What is meant by a precipitation reaction ? Explain by giving an example. Also give balanced chemical equation for the reaction stating the states of the reactions and the products formed.

3

10. ‘ X ‘ ‘ X ’

A solution of a substance ‘ X ‘ is used for testing carbon dioxide. Identify ‘ X ‘ . What will be its reaction with carbon dioxide ? Write balanced equation for the reaction ?

3

11.

Explain corrosion with an example, list four different ways that are used to prevent corrosion ?

3

12. 1200 W 2 30 Rs 5.00

An electric heater rated 1200 W operates 2 hour/day. Find the cost of the energy required to operate it for 30 days at Rs 5.00 per unit.

3

13. (a) 1

(b)

(a) What is meant by saying that the potential difference between two points

is 1 volt. (b) What do the following symbols represent in a circuit ? write one function

of each.

3

14.

Why does a current carrying conductor kept in a magnetic field experience

force ? On what factors does the direction of this force depends ? State the rule

used for determination of this force ?

3

15. (a)

(b)

(a) With the help of a heat labelled diagram show how Amoeba captures its

food ?

(b) What is the mode of nutrition in Amoeba ?

3

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16.

How does feedback mechanism regulate the hormone secretion ? Explain with an example.

3

17.

(a)

(b)

Anil observed nerve cell under the micro scope and made the following sketch.

(a) List two mistakes in the diagram and draw correct diagram on your answer sheet. (b) Label the part of the nerve cell which receives information ?

3

18.

List three distinguishing features between fossil fuels and solar energy.

3

19.

Draw a neat and labeled sketch of solar cooker. Give reason, why surface of solar cooker are painted black ?

3

20.

(a) Na, Ca Mg

(b)

(c)

(d)

(e) Fe

Explain the following : - (a) Metals like Na, Ca and Mg are never found in free state in nature ? (b) Solder is used for welding electrical circuit. (c) Silver ornaments turn blakish after some time. (d) Iron oxide is an amphoteric oxide? (e) Hydrogen gas is not evolved when Fe metal reacts with nitric acid.

OR

(a)

(b)

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(a) Explain all ores are minerals but all the minerals are not ores. (b) What is refining of metals ? Which is the most widely used method for refining of impure metals ? Explain with the help of diagram.

21. (a)

(b)

(a) Identify the compound of calcium which is used for plastering of

fractured bones. With the help of chemical equations show how it is

prepared. What special precautions should be taken during the

preparation of this compound ?

(b) Name the substance which on treatment with chlorine, yields bleaching

powder, Also write chemical equation for its preparation.

OR

(a)

(b) ‘P’ ‘Q’

(a) What is the difference between baking soda and washing soda

chemically ? Which of them will be used as an ingredient to make cakes

and why ?

(b) What are olfactory indicators ? ‘P’ and ‘Q’ are aqueous solutions of

sodium chloride and sodium hydroxide respectively. Which of these will

turn blue litmus red and which turns red litmus blue ?

5

22.

L A 20

L/2 2 A

Describe an activity to show the variation of resistance on length of wire. A

wire of given material having length L and area of cross-section A, has a

resistance of 20 . What would be the resistance of another wire of the same

material having length L/2 and area of cross-section 2 A ?

OR

16

400 J

5

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State Joule’s law of heating. Express it mathematically. 400 J of heat is produced each second in a 16 resistor. Find the potential difference across the resistor.

23.

Magnetic field lines at the centre of current carrying circular loop are parallel.

What does this pattern indicates. Draw the pattern of magnetic field lines due

to current carrying circular loop. On what factors does the magnetic field

produced at the centre of current carrying circular coil depend ? State the rule

used to find the direction of magnetic field associated with current carrying

conductor.

OR

What is solenoid. What is the nature of magnetic field inside a current carrying

solenoid. How can the magnetic field inside a solenoid be used to produce an

electromagnet. Explain with the help of diagram.

5

24. (a)

(b)

(c)

(a) Draw the diagram of cross – section of a leaf and label its following parts, chloroplast, guard cells, lower epidermis and upper epidermis. (b) State the function of guard cells. (c) Name the organelle essential for photosynthesis.

OR

(a)

(b)

(a) Draw a diagram of excretory system in human beings and label the following parts. Aorta, kidney, urinary bladder and urethra. (b) How is urine produced ?

5

/ SECTION - B

25. 1

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(a)

(b)

(c)

(d)

On heating ferrous sulphate in a test tube it undergoes. (a) Combination reaction. (b) Decomposition reaction. (c) Displacement reaction. (d) Double displacement reaction.

26.

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

When a cleaned iron nail is placed in copper sulphate solution, the colour of solution changes to (a) blue (b) red (c) pale violet (d) pale green

1

27. 1.0 mL pH

(a)

(b)

(c)

(d)

On introducing a strip of pH in 1.0 mL of the given solution, the pH paper

changed to light red. The given solution could be

(a) Sodium hydroxide

(b) Sodium bicarbonate

(c) Ethanoic acid

(d) A mixture of sodium hydroxide and sodium bicarbonate

1

28. pH pH

(a) 7 (b) 9 (c) 5 (d) 4 A drop of a liquid is poured on a pH paper, such that the colour of pH paper changes to green. The pH of the liquid is (a) 7 (b) 9 (c) 5 (d) 4

1

29. HCl NaOH

(a)

(b)

(c)

(d)

A blue litmus paper was first dipped in dil HCl and then in dil. NaOH solution. It was observed that the colour of the litmus paper. (a) Changed to red.

1

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(b) Changed first to red and then to blue. (c) Changed blue to colourless. (d) Remained blue in both the solution.

30.

(a)

(b)

(c)

(d)

Which one of the following will not be observed when Zinc pieces are added to a solution of copper sulphate ? (a) The solution is blue in the beginning. (b) The solution in the test tube becomes pale green after some time. (c) A reddish brown mass is deposits on the surface of zinc. (d) The final solution becomes colourless.

1

31.

(a)

(b)

(c)

(d)

A strip of copper was placed in a beaker containing zinc sulphate solution. On observing the strip the next day, it was noticed that. (a) The copper strip remained as it was (b) The copper strip a became thinner (c) The copper strip became thicker (d) The colour of the solution in the beaker changed to blue

1

32. (V) I

X, Y, Z

(a)

(b)

(c)

(d)

A student draws the following circuit diagram for the experiment on studying

the dependence of current I on the potential difference V, across a resistor. The

parts labelled, X, Y, and Z in this diagram, are respectively.

1

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(a) a resistor, a voltmeter and a millimeter

(b) a voltmeter, a resistor and a millimeter

(c) a millimeter, a resistor and a voltmeter

(d) a resistor, a millimeter and a voltmeter

33.

(a)

(b)

(c)

(d)

In the circuit shown here, when plug is inserted in the key,then

(a) Voltmeter V is likely to be damaged.

(b) Ammeter A is likely to be damaged.

(c) Resistor R is likely to be burnt.

(d) Both – voltmeter and ammeter are likely to be damaged.

1

34. (V) (I)

A B J

(1), (2), (3) (4)

1

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J

(a) (4)

(b) (1)

(c) A (4) B (1)

(d) A (1) B (4)

To study the dependence of current (I), on the potential difference (V) across a

resistor R, two students used the two set ups shown in fig A and B respectively.

They kept the contact point J in the four different positions.

Marked (1), (2), (3) and (4) in the two figures.

For the two students, the ammeter and voltmeter reading will be maximum

when the contact J is in the position.

(a) (4) in both the set up

(b) (1) in both the set up

(c) (4) in set up A and (1) in set up B

(d) (1) in set up A and (4) in set up B

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35.

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

The following circuits were drawn by four students to determine the equivalent resistance of two resistors when connected in parallel. The correct circuit is draw by student.

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

1

36.

1

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(a) I II (b) II III

(c) III IV (d) I IV

The correct way of connecting the ammeter and voltmeter with series combination of two resistors in a circuit for finding their equivalent resistance is shown in fig.

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

37.

(a) (b)

(c) KOH (d)

Before testing the leaf for starch at the end of experiment “ light is necessary for photosynthesis “ the experimental leaf should be boiled in. (a) Water (b) Alcohol (c) KOH solution (d) Hydrochloric acid

1

38.

1

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(a) A – B –

(b) A – B –

(c) A –

B –

(d) A –

B –

After performing the experiment, Anita drew the following diagram but forgot to label it, which of the following would be correct choice for labelling.

(a) A – starch formed B – no starch (b) A – no starch B – starch formed (c) A – Blue colour appeared due to presence of sucrose. B – colourless part showing absence of sucrose. (d) A – Blue coloured portion showing absence of starch. B – colourless portion showing presence of starch.

39.

(a)

(b)

(c)

(d)

While preparing a temporary stained mount of leaf epidermal peel, the extra stain is removed by (a) washing with water (b) washing with calcium chloride solution. (c) soaking with filter paper. (d) absorbing with cotton wool.

1

40.

(a) A B (b) A C

(c) B C (d) A, B C

In order to complete the diagram of stomatal apparatus given below, nuclei should be drawn in the parts marked

1

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(a) A and B (b) A and C (c) B and C (d) A, B and C

41. KOH

(a)

(b)

(c)

(d)

In the experiment demonstrating respiration in germinating seeds, KOH is used

to :

(a) absorb carbon dioxide produced by the seeds

(b) absorb oxygen present in the flask

(c) absorb water vapour produced by the seeds

(d) liberate oxygen to be used by the seeds

1

42.

(a)

(b)

(c)

(d)

The chemical required in the experiment to show that carbon dioxide gas is

released during respiration, is.

(a) potassium bicarbonate

(b) potassium dichromate

(c) potassium permanganate

(d) potassium hydroxide

1