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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 / ' ' 1. What is skeletal equation ?

570025

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2. Name the metal which has very low melting point and can melt with heat of your palm ?

3. Name the main constituent of biogas and write its formula.

4. What is meant by the statement that the potential difference between two points is 1 volt ?

1

5. Name the components of the alloys steel and stainless steel.

6. You might have seen lemon or tamarind juice being used to clean tarnished surface of copper

vessels. Explain why these sour substances are effective in cleaning the vessels ?

7. When a green iron compound is heated strongly, its colour changes to black and odour of

burning sulphure is given out.

(a) Name the compound

(b) State the type of reaction

(c) Write the chemical equation involved

(a)

(b)

(c)

8. Manganese dioxide when reacts with hydrochloric acid forms Manganese chloride, water and

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chlorine.

(a) Express the above reaction in the form of a balanced chemical equation.

(b) Identify (i) reducing agent, (ii) oxidising agent

9. How are the fats digested in our bodies. Where does this process take place ?

10. List two reasons which limit the usage of solar cells for harnessing energy for domestic use.

11. In the circuit diagram shown, the two resistance wires A and B are of same area of cross section

and same material, but A is longer than B. Which ammeter A1 or A2 will indicate higher reading

for current? Give reason.

A B

A B A1 A2

12. State the need of an earthwire in a domestic circuit ? How and when it becomes useful ?

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13. Four resistors of 2 each are joined end to end to form a square ABCD. Calculate the equivalent

resistance of the combination between any two adjacent corners.

2 ABCD

14. A brown substance ‘X’ on heating in air forms a compound ‘Y’. When hydrogen gas is passed

over ‘Y’, it changes to ‘X’ again.

(i) name the substance ‘X’ and ‘Y’

(ii) Name the processes occurring during the two changes

(iii) Write the chemical equations involved

‘X’ ‘Y’ ‘Y’

‘X’

(i) ‘X’ ‘Y’

(ii)

(iii)

15. Salt A commonly used in bakery products (i) on heating gets converted into another salt B and a

gas C is evolved. (ii) salt B after recrystallization is used for removing hardness of water. (iii)

The gas C when passed through lime water, turns it milky. Identify A,B and C. Write balanced

chemical equations for each step from (i) to (iii)

A (i) B

C (ii) B

(iii) C A, B C (i)

(iii)

16. A water insoluble calcium compound (A) on reacting with dil. H2SO4 released a

colourless and odourless gas (B) with brisk effervescence. When gas (B) is passed

through lime water, lime water turns milky and again formed compound A. Identify

A and B and write the chemical equations for the reactions involved.

(A) H2SO4

(B) (B)

‘A’ A B

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17. What causes Tendril to encircle or coil around the object in contact with it. Explain the process

involved.

18. State the sequence of changes that take place in a human body when it prepares itself to protect

itself from a scary or dangerous situation.

19. What are the factors that should be taken into consideration for selecting a source of energy ?

List any three.

20. A 400W refrigerator operates for 16 h per day. Calculate the cost to operate it for 30 days

at Rs 3.40 per kWh.

400 16 3.40

30

21. Two resistors of 10 and 20 are connected in series to a 20 V battery. Calculate the

potential difference across the 10 resistor.

10 20 20 V 10

22. (a) What is the function of an earth wire ? Why is it necessary to earth metallic

appliances ?

(b) What is the difference between overloading and short circuiting ?

(a)

(b)

23. (i) What causes rusting of iron ? Design an activity to show the conditions needed for

iron nails to rust. (ii) Why do we paint iron articles ?

(i)

(ii)

OR Pieces of four metals A,B,C and D were one by one added to four solutions, namely iron (II)

sulphate, copper (II) sulphate, zinc sulphate and silver nitrate The observations made are

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tabulated below.

Answer the following questions based on the above information.

(i) Which is the most active metal and why ?

(ii) What would be observed if B is added to a solution of copper sulphate and why ?

(iii) Arrange the metals A,B,C and D in order of increasing reactivity.

(iv) Container of which metal can be used to store both zinc sulphate solution and

silver nitrate solution ?

(v) Which of the above solutions can be safely stored in a container made up of any of these metals ?

A, B, C D

(ii) (ii)

(II) (II)

A

B

C

D

(i)

(ii) B

(iii) A, B, C D

(iv)

(v)

24. (a) Enumerate the events that actually happen during the process of photosynthesis.

(b) Name any two parasitic plants and two parasitic animals.

(a)

(b)

OR

Metal Iron (II) sulphate Copper (II) Sulphate Zinc sulphate Silver nitrate

A No reaction Displacement

B Displacement No reaction

C No reaction No reaction No reaction Displacement

D No reaction No reaction No reaction No reaction

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(a) Draw a diagram of an excretory unit of a human kidney and label the following :

Bowman’s capsule, Glomerulus, Collecting Duct, Renal Artery.

(b) Write the important function of the structural and functional unit of kidney.

(c) Write any one function of an artificial kidney.

(a)

(i) (ii)

(iii) (iv)

(b)

(c)

25. (a) Name the scientist who discovered that a moving magnet can be used to generate electric

current. With which name is this phenomenon known ?

(b) Two coils 1 and 2 of insulated copper wire having large but different number of turns are

wound over a cardboard cylinder. Coil 1 is connected to battery and a plug key. Coil 2 is

connected to a galvanometer. How will the galvanometer reading change when ?

(i) key is plugged in, and (ii) key is taken out.

Give reason for your answer.

(c) Name and state the rule used for determination of direction of induced current due to a

changing magnetic field and give one practical application of this phenomenon in

everyday life.

(a)

(b) 1 2

1

2

(i) (ii)

(c)

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

through the loop clockwise. With the help of a diagram explain how the direction of the

magnetic field can be determined inside and outside the loop. Name the law used to find

the direction of magnetic field.

(b) Draw a diagram to represent a uniform magnetic field in a given region.

(c) List two properties of magnetic field lines.

(a)

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(b)

(c)

SECTION –B / ' '

26. A student tested the pH of distilled water using pH paper and observed green colour.

After adding a few drops of dilute NaOH solution, the pH was tested again. The colour

change now observed would be :

(a) blue (b) green (c) red (d) orange

pH pH

NaOH pH

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

27. Four solutions I, II III and IV were given to a student to test their acidic or basicnature by

using pH papers. He observed that the colour of pH paper turned to red, blue, green and

orange respectively when dipped in four solutions. The correct conclusion made by the

statement would be

(a) I, II and III are acidic.

(b) I and IV are acidic.

(c) II, III, and IV are acidic.

(d) II and IV are acidic.

I, II III IV pH

pH

(a) I, II III (b) I IV

(c) II, III IV (d) II IV

28. When a student added zinc granules to dilute HCl a colourless and odourless gas evolved. On

testing with a burning match stick it was observed that the match stick :

(a) continued to burn brilliantly.

(b) burnt slowly with a blue flame.

(c) extinguished and the gas burnt with pop sound.

(d) continued to burn brilliantly and the gas burnt with a pop sound.

HCl

(a)

(b)

(c)

(d)

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29. Reddish brown deposit observed on iron nails, when these are kept in aqueous solution of

CuSO4 , is that of

(a) Cu2O (b) CuO (c) Cu (d) CuS

CuSO4

(a) Cu2O (b) CuO (c) Cu (d) CuS

30. When crystals of FeSO4 are strongly heated the residue obtained is

(a) red in colour. (b) blue in colour.

(c) green in colour. (d) colourless.

FeSO4

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

31. Which of the following experimental set up is correct for verification of Ohm’s

law ?

(a) A (b) B

(c) both A and B (d) Neither A nor B

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(a) A (b) B

(c) A B (d) A B

32. 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 figure A and B respectively. They kept the contact point

J in four different positions marked, (a), (b), (c), (d), in the two figures

For the two students the ammeter and voltmeter readings will be maximum when the contact J

is in the position :

(a) d in both the set ups.

(b) a in both the set ups.

(c) d in set up A and a in set up B.

(d) a in set up A and d in set up B.

R (V) (I)

(A) (B) J

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

J

(a) d

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(b) a

(c) (A) d (B) a

(d) (A) a (B) d

33. Identify the circuit diagram in which the electrical components have been properly connected.

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

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

34. In parallel combination of resistors, two students connected the ammeter in two different

ways as shown in given circuits I and II.

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The ammeter has been correctly connected in :

(a) circuit I only (b) circuit II only

(c) both the circuits I and II (d) neither of the two circuits

I II

(a) I (b) II

(c) I II (d)

35. Which one of the following precaution is NOT to be taken while conducting the experiment to

determine the equivalent resistance of two resistors connected in series ?

(a) Get the circuit diagram checked by your teacher before passing current.

(b) Connect +ve terminal of the ammeter to the +ve terminal of the battery.

(c) Wait atleast for 30 seconds after closing the key.

(d) Take care that the battery is not short circuited.

(a)

(b)

(c) 30

(d)

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36. A portion of destarched leaf of a potted plant was covered with a black strip of paper. The

plant was exposed to sunlight for six hours and then tested for starch. It was observed that (a) both covered and uncovered parts turned blue black.

(b) both covered and uncovered parts turned brownish yellow.

(c) only the uncovered part turned blue black.

(d) only the covered part turned blue black.

(a)

(b)

(c)

(d)

37. Figures A, B, C and D show leaves that has been boiled in alcohol, placed in four beakers

containing liquids as labelled.

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

In which one of the above a positive test for presence of starch would be obtained ?

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

A, B, C D

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

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

38. A well stained leaf peel preparation when focussed under high power of the microscope would

show :

(a) epidermal cells, stomata and guard cells, each with one nucleus and many chloroplasts.

(b) epidermal cells, stomata and guard cells, each with many nuclei but one chloroplast.

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(c) stomata and guard cells without nuclei or chloroplast.

(d) stomata but no guard cells or epidermal cells.

(a)

(b)

(c)

(d)

39. In the following diagram of the stomatal apparatus, which parts are correctly labelled ?

(a) (i) and (v) (b) (ii) and (v) (c) (iv) and (ii) (d) (v) and (iv)

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

40. In the experiment demonstrating respiration in germinating seeds, the water rises in the delivery

tube due to

(a) seeds use up oxygen in the flask.

(b) CO2 is given out by germinating seeds.

(c) germinating seeds suck the water from the beaker.

(d) a partial vacuum is created as CO2 is absorbed by KOH.

(a)

(b) CO2

(i)

(ii)

(v)

(iii)

(iv)

(i) Guard cell

(ii) Thin wall

(iv) Nucleus

(iii) Thin wall

(v) Epidermal cell

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(c)

(d) KOH CO2

41. What is the use of KOH solution in this experiment ?

(a) Absorbs CO2 released by germinating seeds

(b) Absorbs O2 released by germinating seeds.

(c) Absorbs moisture released by the seeds.

(d) Providers moisture to germinating seeds.

KOH

(a) CO2

(b) O2

(c)

(d)