MANOJ KUMAR (SHELFORD)

Saturday, February 11, 2012

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?[2­­1/2]
(b)  Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?[21/2]
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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