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