cbse class 10 science question paper sa 1 2011 (4)

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SUMMATIVE ASSESSMENT - I (2011)

Lakdfyr ijh{kk&I (2011)

SCIENCE / foKku

Class – X / & X

Time allowed : 3 hours Maximum Marks : 80 fu/kkZfjr le; % 3 ?k.Vs vf/kdre vad % 80

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 to section A and all questions of section B are to be attempted separately. v). Questions 1 to 4 in section A are one mark questions. These are to be answered in one word or

one sentence. vi). Questions 5 to 13 in section A are two marks questions. These are to be answered in about 30

words each. vii). Questions 14 to 22 in section A are three marks questions. These are to be answered in about 50

words each. viii). Questions 23 to 25 in section A are five marks questions. These are to be answered in about 70

words each. ix). Questions 26 to 41 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.

lkekU; funsZ”k %

(i) bl iz”u i= dks nks Hkkxksa, Hkkx v vkSj Hkkx c esa ckaVk x;k gSA vkidks nksuksa Hkkxksa ds iz”uksa ds mRrj fy[kus gSaA

(ii) lHkh iz”u vfuok;Z gSaA

(iii) iwjs iz”u i= ij dksbZ p;u izkIr ugha gS ijUrq ikap&ikap vadks ds ikWap iz”uksa esa Hkhrjh p;u fn;k x;k gSA bu iz”uksa esa

vki dsoy ,d Hkhrjh p;u dks mRrj fy[kus ds fy, pqu ldrs gSaA

(iv) vkidks Hkkx v vkSj Hkkx c ds lHkh iz”uksa ds mRrj i`Fkd&iFkd fy[kus gksaxsA

(v) Hkkx v ds iz”u la[;k 1 ls 4 ds iz”u ,d&,d vad ds gSaaA buds mRrj ,d “kCn vFkok ,d okD; esa nsaA

(vi) Hkkx v ds iz”u la[;k 5 ls 13 ds iz”u nks&nks vadksa ds gSaA buds mRrj yxHkx 30&30 “kCnksa esa nsus gSaA

(vii) Hkkx v ds iz”u la[;k 14 ls 22 ds iz”u rhu&rhu vadksa ds gSaA buds mRrj yxHkx 50&50 “kCnksa esa nsus gSaA

(viii) Hkkx v ds iz”u la[;k 23 ls 25 ds iz”u ikap&ikap vadksa ds gSaA buds mRrj yxHkx 70 “kCnksa esa nsus gSaA (ix) Hkkx c ds iz”u la[;k 26 ls 41 ds iz”u iz;ksxkRed dkS”ky ij vk/kkfjr cgqfodYih iz”u gSaA izR;sd iz”u ,d vad dk

gSA fn, x;s pkj fodYiksa esa ls vkidks dsoy ,d lcls mi;qDr fodYi pquuk gSA

SECTION-A / ' '

570026

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1. State one basic difference between a physical change and a chemical change.

2. A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance,

whereas Z is a good conductor of electricity. Identify Y and Z.

X Y Z Y Z

Y Z

3. List two main constituents of biogas.

4. How is an ammeter connected in a circuit to measure current flowing through it ?

5. The way metals like sodium, magnesium and iron react with air and water is an indication of

their relative positions in the „reactivity series‟. Is this statement true ? Justify your answer

with examples.

6. Though the compounds such as glucose and alcohol have hydrogen atoms in their molecule

yet they are not categorized as acids, why ?

7. Using balanced chemical equation explain the difference between a displacement reaction

and a double displacement reaction.

8. Using a suitable chemical equation justify that some chemical reactions are determined by :

(i) change in colour,




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(ii) change in temperature.

(i)

(ii)

9. What is saliva ? State its role in the digestion of food.

10. Biogas is considered to be a boon to the farmers. Give reasons.

11. An electric heater draws a current of 10A when connected to a 200 V supply. What

current will the heater draw when it is connected to 220 V supply.

200 V 10A 220 V

12. Insulation cover of which colour is conventionally used for earth wire ? Why is an earth wire

connected to metallic parts of appliances ?

13. A 9 resistance is cut into three equal parts and connected in parallel. Find the

equivalent resistance of the combination.

9 3

14. (a) Classify the following reactions into different types

(i) AgNO3 (aq)NaCl(aq) AgCl(s)NaNO3(aq)

(ii) CaO(s)H2O Ca(OH)2

(iii) 2KClO3 (s)

2KCl3O2

(b) Which of the above reaction(s) is/are precipitation reaction(s) ? Why is a reaction called precipitation reaction ?




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(i) AgNO3 (aq)NaCl(aq) AgCl(s)NaNO3(aq)

(ii) CaO(s)H2O Ca(OH)2

(iii) 2KClO3 (s)

2KCl3O2

15. (a) What is universal indicator ?

(b) Write the chemical equation involved in the preparation of sodium hydroxide.

Name the process.

(a)

(b)

16. What are the final products of carbohydrates, proteins and fats after their digestion.

17. (a) Which plant hormone is present in greater concentration in the areas of rapid cell

division ?

(b) Give one example of a plant growth promoter and a plant growth inhibitor.

(a)

(b)

18. Which organ secrets a hormone when blood sugar rises in our body ? Name the hormone

and name one enzyme released by this organ.

19.

(a) “The breathing cycle is rhythmic whereas, exchange of gases is a continuous

process”. Justify this statement.

(b) What happens if conducting tubes of circulatory system develops a leak ? State in

brief, how could this be avoided ?




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(c) How opening and closing of stomata takes place ?

(a)

(b)

(c)

20. A torch bulb is rated 2.5 V and 750 mA. Calculate (i) its power, (ii) its resistance and (iii) the

energy consumed if this bulb is lighted for four hours.

2.5 V 750 mA (i) (ii) (iii)

21. Series arrangements are not used for domestic circuits. List any three reasons.

22. A positively charged particle projected towards west is deflected towards north by a

magnetic field. What is the direction of the magnetic field ? State the rule applied to determine direction of magnetic field.

23. (a) Write the electron dot structures of sodium, oxygen and magnesium.

(b) Show the formation of Na2O and MgO by transfer of electrons.

(c) List three properties of ionic compounds.

(a)

(b) Na2O MgO

(c)

OR (a) What is meant by metallurgy ?

(b) State two steps associated with extraction of copper from its ore.

(c) How is impure copper purified by electrolytic refining ? Draw a labelled diagram to




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illustrate it.

(a)

(b)

(c)

24. (a) Draw neat diagram of respiratory system and label the following parts.

(i) lungs, (ii) trachea, (iii) bronchus, (iv) diaphragm,

(b) Name the respiratory pigment in human beings and discuss its role.

(c) Why is the rate of breathing in aquatic organisms much faster than that in terrestrial organisms ?

(a)

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

(b)

(c)

OR (a) Draw the diagram of human heart and label the following parts which :

(i) receives deoxygenated blood from vena cava,

(ii) send deoxygenated blood to lung through pulmonary artery,

(iii) receives oxygenated blood from lungs and

(iv) sends oxygenated blood to all parts of the body through aorta.

(b) What does the blood consist of ?

(c) Write two functions of blood.

(a)

(i)

(ii)

(iii)

(iv)




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(b)

(c)

25. Explain why two magnetic lines do not intersect each other. State the rule for determining

the direction of the magnetic field produced around a current carrying conductor. Draw a

sketch of the pattern of field lines due to a current flowing through a straight conductor.

OR (i) What is a solenoid ? Draw a sketch of the pattern of field lines of the magnetic field

through and around a current carrying solenoid.

(ii) Consider a circular loop of wire lying in the plane of the table. Let the current pass

through the loop clockwise. Apply the right hand rule to find out the direction of the

magnetic field inside and outside the loop.

(i)

(ii)

SECTION –B / ' '

26. Four students were given three colourless liquids A,B,C of water, lemon juice and a mixture

of water and lemon juice respectively. After testing these liquids with pH paper, following

sequences in colour change of pH paper were reported.

(i) Blue, Red and Green (ii) Orange, Green and Green

(iii) Green, Red and Red (iv) Red, Red and Green

The correct sequence of colours observed is :

(a) (i) (b) (ii) (c) (iii) (d) (iv)

A, B, C

pH pH

(i) (ii)




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(iii) (iv)

(a) (i) (b) (ii) (c) (iii) (d) (iv)

27. Four students (A), (B), (C) and (D) separately measured the pH values of each one of the

given samples of distilled water, acetic acid, dilute hydrochloric acid, and a solution of sodium hydroxide using pH papers.

Which one of the following represents a correct ?

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

(A), (B), (C) (D)

pH pH

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

28. Four students studied reactions of zinc and sodium carbonate with dilute hydrochloric acid

and sodium hydroxide solutions and presented their results as follows. The (3) represents

evolution of gas and (5) represent absence of any reaction.

The correct set of observations is that of student :

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

(3)




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(5)

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

29. When CO2 is passed through lime water, the solution becomes milky due to formation of

(a) CaCO3 (b) Ca(OH)2

(c) Ca(HCO3)2 (d) CaO

CO2

(a) CaCO3 (b) Ca(OH)2

(c) Ca(HCO3)2 (d) CaO

30. When an iron nail rubbed with sand paper is dipped in copper sulphate solution, we observe

that copper gets deposited

(a) first on the lower part of the nail and proceeds to the upper part.

(b) first on the upper part of the nail and proceeds to the lower part.

(c) on the entire surface of the nail.

(d) on the nail in small patches.

(a)

(b)

(c)

(d)

31. The range of a voltmeter is 0 to 2.0V. If if has 20 divisions between 0 mark and 0.5 V

mark, the least count is :




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(a) 0.020 V (b) 0.025 V (c) 0.050 V (d) 0.250 V

0 2.0 V 0 0.5 V 20

(a) 0.020 V (b) 0.025 V (c) 0.050 V (d) 0.250 V

32. When a student connects a voltmeter across the terminals of a battery, it measures 6 V.

If he connects a resistance of 2 across the terminals of the battery as shown in the

figure, then the current flowing through this resistance (R) must be :

(a) 2 A (b) 3 A (c) 4 A (d) 6 A

6 V

2 (R)

(a) 2 A (b) 3 A (c) 4 A (d) 6 A

33. A student arranged an electric circuit as shown below :




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He would observe :

(a) no reading either in the ammeter or the voltmeter.

(b) no reading in the voltmeter but a finite reading in the ammeter.

(c) no reading in the ammeter but a finite reading in voltmeter.

(d) a finite reading in both ammeter and the voltmeter.

(a)

(b)

(c)

(d)

34. To determine the equivalent resistance of three resistors arranged in parallel four students

connected the resistors as shown in figures A, B, C and D.




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The correct set up is that of student :

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

A, B, C D

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

35. Two resistances R1 and R2 are to be connected in series combination. Out of the

following the correct combination is shown in :




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(a) only A (b) only B

(c) only C (d) all of them A, B and C

R1 R2

(a) A (b) B

(c) C (d) A, B C

36. The teacher instructed a student to place a healthy potted shoe flower plant in a dark room

for 24 hours prior to an experiment on photosynthesis. The purpose of placing it in a dark

room is to

(a) increase the intake of CO2 .

(b) activate the chloroplasts in the leaves.

(c) destarch the leaves.

(d) denature the enzymes in the leaves.

24

(a) CO2

(b)

(c)




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(d)

37. A student performed starch test on a leaf. Four steps involved in the test are shown below :

The correct sequence of steps should be

(a) (iv), (iii), (i), (ii) (b) (i), (ii), (iv), (iii)

(c) (ii), (iii), (iv), (i) (d) (i), (iii), (iv), (ii)

(a) (iv), (iii), (i), (ii) (b) (i), (ii), (iv), (iii)

(c) (ii), (iii), (iv), (i) (d) (i), (iii), (iv), (ii)

38. In the following sketch of the stomatal apparatus the parts I, II, III and IV were labelled ,

differently by four students.




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The correct labelling out of the following is :

(a) (I) Guard cell (II) Stoma

(III) Starch granule (IV) Nucleus

(b) (I) Cytoplasm (II) Nucleus

(III) Stoma (IV) Chloroplast

(c) (I) Guard cell (II) Starch

(III) Nucleus (IV) Stoma

(d) (I) Cytoplasm (II) Chloroplast

(III) Stoma (IV) Nucleus

I, II, III IV,

(a) (I) (II)

(III) (IV)

(b) (I) (II)

(III) (IV)




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(c) (I) (II)

(III) (IV)

(d) (I) (II)

(III) (IV)

39. In the sketch of the stomatal apparatus given below which one of the following is missing ?

(a) Cell membranes of the cells

(b) Cell walls of the cells

(c) Nuclei in the guard cells

(d) Chloroplasts in the guard cells

(a) (b)

(c) (d)

40. In the following experimental set up a small test tube containing KOH pellets is kept in the

conical flask to absorb :




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(a) air in the flask.

(b) moisture in the flask.

(c) oxygen in the flask.

(d) CO2 released by the germinating seeds during respiration.

KOH

(a)

(b)

(c) (O2)

(d) CO2

41. Before setting up an experiment to show that seeds release CO2 during respiration, the

seeds should be :

(a) dried completely. (b) boiled to make them soft.




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(c) soaked in vinegar. (d) kept moist till they germinate.

CO2

(a) (b)

(c) (d)




cbse class 10 science question paper sa 1 2011 (4)

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