summative assessment- 1 cbse class x science, revision sample paper.

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”Read the instructions carefully before answering”

·         Try to answer in your own words as far as possible.

·         Include diagrams wherever required.

·         Diagrams should be drawn and  labeled with pencil only.

·         

1 marks X 9 = 9 marks (A)

1.      Why should a magnesium ribbon be cleaned before burning in air?

2.      Why do ionic compounds have high melting points?

3.      Why does an aqueous solution of an acid conduct electricity?

4.      What processes would you consider essential for maintaining life?

5.      Which part of the brain maintains posture and equilibrium of the body?

6.      What is meant by saying that the potential difference between two points is 1 V?

7.      What is a good source of energy?

8.      What is a good fuel?

9.      What is the role of the acid in our stomach?

2 marks X 9 =  18 marks (B)

10.  Why does the colour of copper sulphate solution change when an iron nail is dipped in it?

11.  Why should curd and sour substances not be kept in brass and copper vessels?

12.  What are plant hormones? Give two examples?

13.  Why is the use of iodised salt advisable?

14.  How is the small intestine designed to absorb digested food?

15.  A current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes. Find the amount of electric charge that flows through the circuit.

16.  Draw magnetic field lines around a bar magnet.

17.  If you could use any source of energy for heating your food, which one would you use and why?

18.  what are the disadvantages of fossil fuels?

3 marks x 6 = 18 marks (C)  

19.  3. Identify the substances that are oxidised and the substances that are reduced in the following reactions.

20.  (i) 4Na(s) + O2(g) → 2Na2O(s)

(ii) CuO(s) + H2(g) → Cu(s) + H2O(l)

21.  What are the different ways in which glucose is oxidized to provide energy in various organisms?

22.  What is a balanced chemical equation? Why should chemical equations be balanced?

23.  What will happen if a solution of sodium hydrocarbonate is heated? Give the equation of the reaction involved.

24.  Compare and contrast bio-mass and hydro electricity as sources of energy.

5 marks X 3 = 15 marks (D)

25.  Write the balanced chemical equations for the following reactions.

(a)   Calcium hydroxide + Carbon dioxide  →  Calcium

carbonate + Water

(b) Zinc + Silver nitrate  →  Zinc nitrate + Silver

(c) Aluminium + Copper chloride  →  Aluminium chloride +

      Copper

(d) Barium chloride + Potassium sulphate → Barium sulphate

      + Potassium chloride

26.  Describe double circulation in human beings. Why is it necessary?

27.  (1) The potential difference between the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. What current will the heater draw if the potential difference is increased to 120 V?

(2)  Resistance of a metal wire of length 1 m is 26 Ω at 20°C. If the diameter of the wire is 0.3 mm, what will be the resistivity of the metal at that temperature? Using Table 12.2, predict the material of the wire.

Total marks = 9(A) + 18(B) + 18(C) + 15(D)   = 60 marks

“Best of luck”           
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tips for preparing and scoring for the summative assessment ii, class x examination 2012

1. there is nothing other than the text book of N.C.E.R.T to be consulted, so don't bang your heads on other books, it will be just a loss of time.
2. go through the lessons line by line from the N.C.E.R.T text book, all the questions are directly from the book.
3. try to write as concise as possible, don't put useless information in your answers, since science has nothing to do with useless essays and facts, try to write only what you know, and don't just guess answers, it will surely harm you.
4. if possible try to include diagrams/figures wherever possible, whether it is asked in the question or not.
5. for the objective questions, you should have a good concept of all the practicals included in your syllabus, coz the objective questions are all practical oriented conceptual questions, they cant be just guessed and answered.

summative assessment ii guess paper (science) for class x -2012

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SA₂RT

 (SUMMATIVE ASSESSMENT II REVISION TEST)

SHELFORD TUTORIALS

1.      What is the ultimate source of energy on earth?[1]

2.      What is the scientific name of the yellow spot?[1]

3.      Define reflection?[1]

4.      Define Darwinism?[1]

5.      Yeast reproduces through budding. (true/false).[1]

6.      Which functional group does –CHO represents?[1]

7.      What do you mean by valence electrons of and atom?[1]

8.      What do you mean by a food web?[1]

                                                    

9.      Differentiate between the food web and the food chain?[2]

10.  What is the power of accommodation?[2]

11.  Draw a ray diagram of a concave mirror, when the object is placed at the focus.[2]

12.  Draw structures of 1,2-dichloro,pentane and cyclohexane.[2]

13.  What is Newlands’ law of octaves?[2]

14.  What is the function of the vas-defrens and epididymis.[2]

15.  Name two ways of vegetative propagation.[2]

16.  Differentiate between implantation and fertilization in humans?[3]

17.   show the difference between the recessive and the dominant alleles?[3]

18.  What do you mean by the acquired and the inherited traits, which of the following is transferred to the next generation ? give reason.[3]

19.  Draw a well labeled diagram of the human eye. Or. What are the corrective measures for the hypermetropia and myopia, describe with figures[3].

20.  What are sign conventions for the convex mirror?[3]

21.  A convex mirror used for rear-view on an automobile has a radius of curvature of 3.00 m. If a bus is located at 5.00 m from this mirror, find the position, nature and size of the image.[3]

22.  Discuss speciation in brief with the help of  an example?[3]

23.  A mixture of oxygen and ethyne is burnt for welding. Can you tell why a mixture of ethyne and air is not used?[3]

24.  What were the limitations of Döbereiner’s classification?[3]

25.  Why should we conserve forests and wildlife?  Suggest some approaches towards the conservation of forests.[3]

26.  Explain why the sky appears reddish during the time of sunset and sunrise, name the phenomena responsible for this.[3]

27.  Describe the structure and function of the male reproductive system.[5]

28.  How is the equal genetic contribution of male and female parents ensured in the progeny, also elaborate how the sex of new individuals are determined.[5]

29.  (a)  Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?[2_­­^1/2]

(b)  Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?[2^1/2]

30.  An object, 4.0 cm in size, is placed at 25.0 cm in front of a concave mirror of focal length 15.0 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Find the nature and the size of the image. [5]

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Best of luck