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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.

SC2-068

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SECTION - A 1.

State the colour convention used for live, neutral and earth wires used in domestic electric circuits.

1

2.

List two functions of testosterone.

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3.

The increase in demand for energy is affecting our environment adversely. List two such effects.

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4.

(i) ZnO C Zn CO

(ii) MnO2 4HCl MnCl2 Cl2 2H2O)

In the following reactions, state the reactants which undergo oxidation and which undergo reduction.

(i) ZnO C Zn CO

(ii) MnO2 4HCl MnCl2 Cl2 2H2O)

5.

The surface of some metals acquire dull appearance when exposed to air for a long time. Name the process responsible for this and give examples of three metals stating the chemical compound formed in each case.

2

6.

Derive the relation for the combined resistance (equivalent resistance) of a system in

which three resistors are connected in series.

2

7.

State right hand thumb rule to find the direction of the magnetic field around a current – carrying straight conductor. Show by drawing a diagram.

2

8.

(i)

(ii)

(iii)

Translate the following into balanced chemical equations:

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(i) Copper reacts with silver nitrate to form copper nitrate and silver.

(ii) Lead nitrate reacts with sulphuric acid to form a precipitate of lead sulphate

and nitric acid.

(iii) Magnesium burns in presence of nitrogen to form magnesium nitrate.

9. (a) ‘X’ ‘X’

(b) ‘X’

(a) A solution of a substance ‘X’ is used for testing carbon dioxide. What will be

the reaction of ‘X’ with carbon dioxide? Write balanced equation for this

reaction.

(b) How is ‘X’ obtained? Give chemical equation.

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10.

Describe an activity to prove that all hydrogen containing compounds such as

alcohols and glucose are not acids.

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11. (a) NaCl 11 17

(b)

(a) Show the formation of NaCl from sodium (At No. 11) and chlorine

(At No. 17) atoms by the transfer of electrons.

(b) Why does sodium chloride have a high melting point ?

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12.

(a)

(b) (i) 10 15

(c)

Study the following circuit and answer the questions that follow:

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(a) State the type of combination of the two resistors in the circuit. (b) How much current is flowing through (i) 10 and 15 resistors ? (c) What is the ammeter reading ?

13. 25 cm 6.5 0.3 mm

Resistance of a metal wire of length 25 cm is 6.5 . If the diameter of the wire is 0.3 mm, calculate the resistivity of metallic wire.

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14.

5 A 100 W

What potential difference is maintained between the live wire and the neutral wire in our domestic electric supply ? The main power supply of a house is through a 5 A fuse. How many 100 W bulbs can be used in this house at the correct voltage ?

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15.

(a) ‘A’ ‘B’

(b)

(c) 2-3

An experiment was performed to demonstrate that chlorophyll is essential for photosynthesis. Given below are the diagrams of a variegated leaf before and after starch test:

Before starch test

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(a) What would be the colour of the areas ‘A’ and ‘B’? (b) During the experiment, why is the leaf dipped in alcohol? (c) Why the plant from which leaf is taken was kept in the dark for 2-3 days ?

16.

(i) (ii)

Name the two main organs of our central nervous system. Which one of the two plays a major role in sending command to muscles to act without involving thinking process? Name the phenomenon involved. Name the receptors which detect (i) taste (ii) smell

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17. (a)

(b)

(a) Draw a diagram of human brain and label on it cerebrum and cerebellum. (b) State the role of cerebellum.

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18.

With the help of a diagram, state the construction and working of a box type solar cooker.

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19.

What is a wind energy farm? State its importance with two limitations.

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20. (a)

(b)

(c)

(a) In what forms are metals found in nature? With the help of examples, explain how metals react with oxygen and water. Write chemical equation for the reaction.

(b) Aluminium does not corrode like iron. Why? (c) Corrosion of iron is prevented by coating it with a layer of oil, grease or paint.

Why?

/OR

(a)

(i)

(ii)

(iii)

(b)

(i) (ii)

(a) Give reasons: (i) Zinc oxide is considered as amphoteric oxide.

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(ii) Non-metals generally do not displace hydrogen from dilute – acids.

(iii) A small amount of silver is added to pure gold for making ornaments. (b) Name the constituents of the following alloys: (i) Bronze (ii) Stainless steel In what way are these alloys different from their constituents?

21. (a)

(b)

(c)

(i) (ii)

(a) How is plaster of Paris chemically different from gypsum? How may they be interconverted? Why should it be stored in moisture proof container?

(b) Write the chemical name of baking soda. What happens when it is heated ? (c) State one use each of (i) Plaster of Paris (ii) Baking Soda

/OR

(a)

(b)

(a) Write the name and chemical formula of the calcium compound used for disinfecting water. How is this compound manufactured? Write chemical equation for the reaction involved.

(b) What is baking powder? What happens when it is heated or mixed with water? Write chemical equation for the reaction involved.

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22. V I

I 0.5 1.0 2.0 3.0

V 1.5 3.0 6.0 9.0

(i) V I

(ii)

(iii)

The values of current I flowing in a given resistor for the corresponding valued of

potential difference V across the resistor are given below :

I (ampere) 0.5 1.0 2.0 3.0

V (Volts) 1.5 3.0 6.0 9.0

(i) Plot a graph between V and I

(ii) Calculate the resistance of the resistor from the graph

(iii) What does the graph represent? Name and state the law.

/OR

(a) V - I

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(b) I A V

R V l A

(a) Draw V – I graph for an ohmic resistor. What does the slope of this graph indicate?

(b) A potential difference V exists across a conductor of length l and cross section area A. How is the resistance R of the conductor affected when only V is halved, only l is halved and only A is halved? Justify your answer in each case.

23. (a)

(b)

(c)

(a) What are magnetic field lines? State a method of determining the direction of magnetic field at a point.

(b) Draw two field lines around a bar magnet along its length on its two sides and mark the field directions of them by arrow marks.

(c) List any three properties of magnetic field lines.

/OR

(a)

(i) (ii)

(iii) (iv)

(b)

(a) Draw a schematic labelled diagram of a domestic wiring circuit which includes

(i) a main fuse (ii) a power meter (iii) one light point and a (iv) power plug (b) State the importance of connecting an earth wire to electric appliances having

metallic covers ?

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24. (a)

(b)

(i) (ii)

(a) Draw a sectional view of the human heart and label on it. Right ventricle, aorta, pulmonary veins.

(b) State the functions of the following components of transport system: (i) Blood (ii) Lymph

/OR

(a)

(b)

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(a) Draw the structure of a nephron and label the following on it. Renal artery, collecting duct, glomerulus, Bowman’s Capsule. (b) What happens to glucose that enters the nephron along with filtrate? Name

the organ of excretory system where the urine is stored. SECTION – B 25.

(a)

(b)

(c)

(d)

When sodium sulphate solution is added to barium chloride solution (a) brown precipitate appears after sometimes (b) red precipitate appears almost instantaneously (c) white precipitate appears immediately (d) the solution turns pink

1

26.

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

The coating which is observed on iron metal when it is kept immersed in a solution of copper sulphate appears (a) reddish brown (b) grey (c) green (d) black

1

27. (P), (Q), (R)

(P), (Q) (R)

pH

(a) P > Q > R (b) R > P > Q (c) Q > P > R (d) R > Q > P On adding a few drops of universal indicators to three unknown colourless solutions (P), (Q), and (R) taken separately in three test tubes shown in the following diagrams, a student observed the changes in colour as green in (P), red in (Q) and violet in (R).

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The decreasing order of pH of the solutions taken is: (a) P > Q > R (b) R > P > Q (c) Q > P > R (d) R > Q > P

28. pH

(a) (b)

(c) (d) NaCl

Which of the following will turn pH paper to red ? (a) Milk of Magnesia (b) Baking soda (c) Oxalic acid solution (d) NaCl solution

1

29. HCl

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

Rahul took some zinc granules in a test tube and added dilute HCl to it. He observed that the colour of the zinc granules changed to (a) yellow (b) brown (c) black (d) white

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30.

(a)

(b)

(c)

(d)

Solutions of ferrous sulphate, zinc sulphate, copper sulphate and aluminium sulphate were separately taken in four test tubes and a few iron filings were added to each of the solutions. After few minutes, it was observed that the colour of : (a) all the four solutions changed (b) solutions of zinc sulphate and aluminium sulphate only changed (c) solutions of zinc sulphate, copper sulphate and aluminium sulphate changed

and that of ferrous sulphate did not change (d) copper sulphate solution only changed

1

31.

I -

II -

III -

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

A student added zinc granules to copper sulphate solution taken in a test tube. Out of the following the correct observation (s) make by the student were I Zinc granules have silvery grey colour II Zinc granules have no regular shape III The colour of zinc granules changed to brownish black (a) I only (b) II only (c) I, II, and III (d) III only

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32.

(a) A (b) A B

(c) B C (d) C A

The positive and negative terminal markings are missing on a given battery. The correct terminal markings can best be identified by the arrangement shown in :

(a) Fig. A (b) Figs. A and B (c) Figs. B and C (d) Figs. C and A

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33.

0 6 V

3 6

A1 0 5 A

0.25 A

A2 0 3 A ;

0.1 A

V1 O 10 V

0.5 V

V2 O 5 V

0.1 V

(a) A1 V1 (b) A1 V2

(c) A2 V1 (d) A2 V2

The following apparatus is available in a laboratory

Battery : adjustable from 0 to 6 V

Resistors : 3 and 6

Ammeters : A+ of range 0 to 5 A

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least count 0.25 A

A2 of range 0 to 3 A

least count 0.1 A

Voltmeters : V1 of range O to 10 V

Least of count 0.5 V

V2 of range 0 to 5V

Least count 0.1 V

For the experiment, “To find equivalent resistance of the parallel combination of the

two resistors”, the best choice would be:

(a) ammeter A1 and voltmeter V1

(b) ammeter A1 and voltmeter V2

(c) ammeter A2 and voltmeter V1

(d) ammeter A2 and voltmeter V2

34.

(a) 2 (b) 6 (c) 12 (d) 15

The current flowing through a resistor connected in a circuit and the potential

difference developed across its end is as shown in the diagram. The approximate

value of the resistor is:

(a) 2 (b) 6 (c) 12 (d) 15

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35.

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(a) A (b) B (c) C (d) D To determine the equivalent resistance of three resistors, when connected in a parallel arrangement, four students connected the resistors as follows:

The correct setup is that of student: (a) A (b) B (c) C (d) D

36.

X, Y Z

(a) (b)

(c) (d)

The given circuit diagram shows the experimental arrangement of different circuit components for determination of equivalent resistance of two resistors connected in series. The components X, Y and Z shown in the circuit respectively, represent:

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

37.

(a)

(b)

(c)

(d)

In the experiment to demonstrate that light is necessary for photosynthesis, what are the precautions ? (a) Black paper should be attached with the leaf tightly so that sunlight may not

reach the covered area. (b) Do not boil the leaf in alcohol directly on flame. (c) Always decolourise the leaf before starch test. (d) All the above.

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38. 8

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

A leaf from a destarched plant was covered with black strip as shown in figure and the plant was kept in sunlight for 8 hours. The leaf was tested with iodine after boiling it in alcohol. The part/(s) that turned blue black is/are:

(a) A only (b) B only (c) C only (d) A and C both

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39.

(a) (b)

(c) (d)

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The extra stain and glycerin should be removed from the slide by – (a) tilting the slide (b) heating it over a spirit lamp (c) drying it in sunlight (d) using blotting paper

40.

(a)

(b)

(c)

(d)

In order to prepare a temporary mount of a leaf peel for observing stomata, the chemical used for staining and mounting respectively are: (a) Methylene blue and glycerin. (b) Glycerin and safranin (c) Safranine and methylene blue (d) Safranin and glycerin

1

41. A B

‘A’

B

(a) A

(b) B

(c)

(d)

Using the same number of given germinating gram seeds, two students A and B set up the experiment separately. Student ‘A’ is used a cotton plug to hold the bent tube in the mouth of the flask. Student B used a rubber cork.

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

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42. Co2 gas

KOH

(a)

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(b)

(c)

(d)

In the experiment, demonstrating release of Co2 gas during respiration in germinating seeds, a test tube containing KOH is kept in the air tight conical flask to (a) absorb carbon dioxide produced by the seeds (b) absorb oxygen present in the flask (c) absorb water vapour released by the seeds (d) liberate oxygen to be used by the seeds for respiration

- o 0 o -