C.B.S.E. SA-II SCIENCE REVISION QUESTION PAPER

Shelford Tutorials

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1.       Draw electron dot structure of H₂.

2.      What is the criteria for the arrangement of elements in the modern periodic table?

3.      Budding is one of the mode of reproduction in yeasts. [true/false]

4.    
The germ cells of human contains 23 pairs of chromosomes. [true/false]

5.      Who postulated the hypothesis -  ‘evolution takes place due to natural selection’

6.     What do you mean by acquired traits?

7.      Define focal length of a spherical mirror.

8.      What is Fovea centralis?

9.     Name one gas responsible for acid rain.

10.  What are two properties of carbon which lead to the huge amount of carbon compounds we see around us? 11. What do you mean by “Law of octaves”?

12.   Differentiate between atomic mass and atomic number.

13.   How does the creation of variations in a species promote survival?

14.  Give the phenotypic and genotypic ratio of a monohybrid cross.

15.  
Why are the small numbers of surviving tigers a cause of worry from the point of view of genetics?

16.  What is Myopia? Suggest the corrective measures for it.

17.   Why is colour of sky blue?

18.   What is law of reversibility of light?

19.  What will be the formula and electron dot structure of cyclopentane?

20. (a) What were the limitations of Döbereiner’s classification?

(b) What were the limitations of Newlands’ Law of Octaves?

21.   How is the sex of the child determined in human beings?

22.  Describe the formation of rainbow with diagram?

23.  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.

24. An object is placed between the focal length and radius of curvature of a concave mirror. Draw a ray diagram to show the formation of image and right the characteristics of the image formed.

25.  Ethanol, commonly called as alcohol is an excellent solvent, is used in medicines and is an important chemical compound involved in synthesis of many chemical compounds. However in spite of its benefits to man, its impact on social behaviour has always been questioned. Media has often show abnormal behaviour of people while drunk. It is considered as a curse in the lives of those who are addicted to alcohol – ‘Alcoholic’ people are not only lowering their metabolism and affecting Central Nervous System, they are also a threat to the lives of others. Anger and rude behaviour are some of its ill effects.

(i)   Comment on the statement – ‘Should production of alcohol should be banned’, give three valid reasons to justify.

(ii)                        As a student what initiative would you take in the common concern of ‘Save Life, Do not Drink’. Give two suggestions.

Or

A 2.0 cm tall object is placed perpendicular to the principal axis of a concave lens of focal length 10 cm. The distance of the object from the mirror is 15 cm. Find the nature, position and size of the image formed. Represent the situation with the help of a ray diagram.

26. Draw a well labeled diagram of human eye. What is power of accommodation?

Or

Make a diagram to show how hypermetropia is corrected. The near point of a hypermetropic eye is 1 m. What is the power of the lens required to correct this defect? Assume that the near point of the normal eye is 25 cm.

27.  Draw the electron dot structures of -- Cyclopentane, methane, S₈, N₂.

Or

Write the history of development of periodic table in brief.

Markings:  question no. 1 – 9 contains 1 mark each [1x9 = 9] Question no. 11 – 18 contains  2 marks each[2 x 9 = 18]

Question no. 19 – 24 contains 3 marks  each [3 x 6 = 18]

Question no. 25 – 25 contains 5 marks each [5 x 3 = 15]

Total = 9 + 18 + 18 + 15 = 70 marks 

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