SUMMATIVE ASSESSMENT - I (2011) - StudiesToday

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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. Write a balanced chemical equation for the burning of magnesium in air.

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2. Why do we apply paint on iron articles ?

3. What are the two disadvantages of burning fossil fuels ?

4.

State in brief the meaning of an electric circuit.

5. An aluminium can is used to store ferrous sulphate solution. It is observed that in a few days

holes appeared in the can. Explain the cause for this observation and write chemical equation to

support your answer.

6. A person is suffering from indigestion due to the intake of hot spicy food. What remedy will you

prescribe to the patient ? Give the name of a chemical that can give relief to him.

7. What would you observe when zinc is added to a solution of iron sulphate ? Name the type of

reaction and write the chemical equation.

8. Write an equation each for decomposition reaction when energy is supplied in the form of :

(i) heat and (ii) light.

(i) (ii)

9. Draw a labelled diagram to show nutrition in amoeba. Give one more example of unicellular

organism.

10. (a) Hydrogen is used as rocket fuel. Why ?

(b) List two limitations of using solar cookers.




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(a)

(b)

11. State the relationship between 1 ampere and 1 volt.

12. Why is it not advisable to handle domestic electrical circuit with wet hands ?

13. Name the property by virtue of which two conductors having identical structures offer different

resistances to the flow of current when connected to the same source of electric current.

14. When is a chemical reaction categorised as a precipitation reaction ? Explain with two examples.

15. A white coloured powder is used by the doctors for supporting fractured bones.

(a) Write chemical name of the powder.

(b) Write its formula.

(c) Write chemical equation, when this white powder is mixed with water.

(a)

(b)

(c)

16. Compounds such as alcohols and glucose also contain hydrogen, but are not categorized as acids.

Describe an activity to prove it.

17. What is endocrine gland ? Name any two endocrine glands present in a human body and

write hormones secreted by them.

18. What is chemotropism ? Give one example. Name any two plant hormones and mention

their functions.




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19.

Draw a labelled schematic diagram of a biogas plant. List the constituents of biogas.

20. Calculate the following from the electric circuit given in Figure.

(a) Effective resistance of the combination of two 8 resistors.

(b) Current flowing through 4 resistor.

(c) Potential difference across 4 resistor.

(a) 8

(b) 4

(c) 4

21. When connected to a 10 V battery a current of 1 ampere flows in a circuit containing an electric

lamp and a conductor of 5 in series. Calculate the resistance of the electric lamp. Now if a

resistance of 10 is connected in parallel with this series combination, what change (if any) in

current flowing through 5 conductor and potential difference across the lamp will take place ?

Give reason. Draw circuit diagram.

10V 5 1

10

5




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22. Describe with the help of a diagram an activity to show that a current carrying conductor

experiences a force when placed in a magnetic field.

23. Answer the following :

(a) How do we find whether a given element is a non metal, if we know its electronic

configuration ?

(b) With the help of a reaction show that zinc is more reactive than iron.

(c) In nature aluminium is found in combined state whereas silver is found in free state. Give

reason.

(d) Why should we not throw small pieces of sodium into a sink in the laboratory ?

(e) Name any two amphoteric oxides.

(a)

(b)

(c)

(d)

(e)

OR (a) A student took sulphur powder on a spatula and heated it. Then he collected the gas

evolved by inverting a test tube over it as shown in the figure. Write a balanced chemical

equation for the reaction taking place.

What will be the action of this gas on :

(i) dry litmus paper and

(ii) moist litmus paper.

(b) What is thermit reaction ? Mention its application.




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(a)

(i)

(ii)

(b)

24. (a) Explain in brief the mechanism of circulation of blood in the human body.

(b) “Lymph is another type of fluid involved in transportation.” Justify this statement by

explaining the process.

(a)

(b)

OR (a) Explain the excretory system in Human beings.




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(b) List any four strategies used by plants for excretion ?

(a)

(b)

25. (a) Draw a shcematic diagram of the common domestic electric circuit.

(b) What causes short circuit to occur ? Name device which is used to save appliances from

damage due to short circuiting.

(a)

(b)

OR Answer the following questions :

(i) What is the direction of magnetic field lines outside a bar-magnet ?

(ii) Why two magnetic field lines cannot intersect each other ?

(iii) What is indicated by crowding of magnetic field lines in a given region ?

(iv) What is the frequency of A.C. in India ?

(v) State one advantage of A.C. over D.C.

(i)

(ii)

(iii)

(iv) (A.C.)

(v)

SECTION –B / ' '

26. Two colours seen at the extreme ends of pH chart are

(a) red and blue (b) red and green

(c) green and blue (d) orange and black




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pH

(a) (b)

(c) (d)

27. Wher student dipped pH paper in the given solution, he found green colour. The given solution

may be

(a) NaOH solution (b) NaCl solution

(c) dilute HCl (d) Na2 CO3 solution

pH

(a) NaOH (b) NaCl

(c) HCl (d) Na2 CO3

28. A colourless and odourless gas is liberated when hydrochloric acid is added to a solution of

washing soda. The name of the gas is :

(a) Carbon dioxide.

(b) Nitrogen dioxide.

(c) Sulphur dioxide.

(d) Sulphur trioxide.

(a) (b)

(c) (d)

29. 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)




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30. 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

31. You are given four voltmeters of given ranges. The correct choice of voltmeter for doing the

experiment with a battery of 4.5 V is :

(a) Voltmeter with range of 0 - 1V (b) Voltmeter with range of 0 - 3V

(c) Voltmeter with range of 0 - 4V (d) Voltmeter with range of 0 - 5V

4.5 V

(a) 0 - 1 V (b) 0 - 3 V

(c) 0 - 4 V (d) 0 - 5 V

32. What is the least count of the following voltmeter ?

(a) 0.5V (b) 0.1V (c) 0.05V (d) 0.005V

(a) 0.5 V (b) 0.1 V (c) 0.05 V (d) 0.005 V

33. Four students measured the following readings by observing, the position of pointer of voltmeter




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as shown, the correct one is :

(a) 2.5 V (b) 2.0 V (c) 2.2 V (d) 2.4 A

(a) 2.5 V (b) 2.0 V (c) 2.2 V (d) 2.4 A

34. The following ammeters and voltmeters are available in the laboratory to find equivalent

resistance of two resistors R1 and R2 in parallel

Ammeters : A1 of Range 0 to 300mA : Least Count 10mA

A2 of Range 0 to 100mA : Least Count 20mA

Voltmeters : V1 of Range 0 to 5V : Least Count 0.2 V

V2 of Range 0 to 4V : Least Count 0.4 V

The best combination of voltmeter and ammeter 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

R1 R2

A1 0 300mA ; 10mA

A2 0 100mA ; 20mA

V1 0 5V ; 0.2 V




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V2 0 4V ; 0.4 V

(a) A1 V1

(b) A1 V2

(c) A2 V1

(d) A2 V2

35. In the experiment on finding equivalent resistance of two resistors, connected in series, four

students I, II, III and IV set up the circuit as shown below :

The correct connections have been made by student

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

I, II, III IV




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

36. A student covered a leaf from a destarched potted plant with a black paper strip and kept the

plant in the garden in morning hours. In the evening he tested the covered portion of the leaf to

test the presence of starch. In this case the student was trying to show that :

(a) CO2 is given out during respiration

(b) CO2 is essential for photosynthesis

(c) Chlorophyll is essential for photosynthesis.

(d) Light is necessary for photosynthesis.

(a) CO2

(b) CO2

(c)

(d)




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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. Four students A,B,C and D, make the records given below, for the parts marked X and Y in this

diagram.

The correct record, out of these is that of student :

Student X Y

(A) Stomata Guard cell

(B) Guard cell Stomata (C) Epidermal cell Stomata

(D) Stomata Epidermal cell




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

X Y A, B, C, D

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

39. A student was asked to focus a permanent slide under the high power of a microscope. This

involved the following steps which have not been written in a correct sequence :

(A) Place the slide on the stage

(B) Clean the microscope and lenses

(C) Focus the material with coarse adjustment

(D) Place the low power objective lens above the slide

(E) Sharpen the focus with fine adjustment

(F) Bring high power objective lens over the slide

Which one of the following is the correct sequence of steps for focusing the slide under high

power ?

(a) B,A,C,E,D,F (b) B,A,C,D,E,F

(c) A,B,F,C,D,E (d) B,A,D,C,F,E

(A)

X Y

(A)

(B)

(C)

(D)




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(B)

(C)

(D)

(E)

(F)

(a) B,A,C,E,D,F (b) B,A,C,D,E,F

(c) A,B,F,C,D,E (d) B,A,D,C,F,E

40. Using the same number of given germinating seeds, two students A and B set up the experiment

separately. Student A used a cotton plug to hold the bent tube to the mouth of the flask. Student

B used air tight rubber cork.

Which one of the following is to be observed after a few hours ?

(a) Water level would rise in the bent tube of A.

(b) Water level would rise in the bent tube of B.

(c) The cotton plug would become wet.

(d) The water in the beaker of B would turn milky.

A B A

B




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(a) A

(b) B

(c)

(d)

41. The function of KOH in the experimental set up to show that CO2 is released during respiration is

:

(a) to enhance respiration

(b) to release oxygen for respiration

(c) to remove water vapour from the flask

(d) to absorb CO2 released by germinating seeds.

CO2 KOH




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(a)

(b)

(c)

(d) CO2




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