SUMMATIVE ASSESSMENT II, SCIENCE CLSS X, MOCK TEST - 2014

Marks: 1 mark (q 1-3), 2 marks (q 4-7), 3 marks (q 8-19), 5 marks (q 20-24)

1.   Among these compounds which one have a triple bond - C2H6, C3H4, C4H10?
2.   Mention the easiest method to detect water pollution.
3.   Name any two oxidizing agents for alcohol.
4.   An object 2cm in size is placed 30 cm in front of concave mirror of focal length 15cm. at what
     distance from the mirror should a screen be place in order to obtain a sharp image?
5.   What is meant by power of accommodation? How does focal length of the eye lens change when we
     shift looking from distant object to nearby object?
6.   Distinguish between food chain and food web?
7.   Why do we seek construction of dams? Mention any two problems faced with the construction of
     dams.
8.   Write the structural formula of the following and state whether these are isomers with reason?
     A) 1– butyne  B) 2 – butyne
9.   A) Why ethane decolourises bromine water, but ethane not?   B)    Write down relevant chemical
equation involved in decolourisation.
10. How can we determine that a given glass of water has suspended particles, which are
non-filterable?
11. Draw a neat labelled diagram of longitudinal section of a typical flower.
12. Describe methods of plant propagation which are commonly used for growing garden plants.
13. Write electronic configuration of Oxygen, Magnesium. Among O-2 and Mg2+, which ion have larger
size and why?
14. Mention uses of concave mirror, concave lens, convex lens.
15. What are the consequences of ozone layer depletion? (mention any three)
16. What is meant by dispersion of white light? Draw a ray diagram to show dispersion of white
light through glass prism. Why do we get different colours?
17. Energy flow in the biosphere is unidirectional and probably follows 10 % rule. Comment upon the
consequences of the statement.
18. Identify the group and period of the following elements (atomic number is given in brackets): A
(5), B(7), C(10).
19. Why should we conserve forest and wild life (any three points)?
20. By drawing ray diagrams, show the formation of image, when an object is placed on the principal
of axis of a concave mirror at the following positions and write about the nature of the image in
each case: At infinity; beyond the centre of curvature; at the centre of curvature; at the
principal axis; between the pole and focus.
21. Human resources in India are depleting with increasing number of people getting infected by
AIDS virus and it has become socio-economic hazard: a) name the virus which causes AIDS; b) mention
the modes of transmission of AIDS; c) what is the effect of AIDS virus on human body? d) Give any
two measures to prevent the transmission of AIDS virus.
22. An organic compound A is widely used as preservative in pickles and has a molecular formula
C2H4O2.
This compound react with ethanol to form a sweet smelling compound B.
a) Identify the Compound A; b) Write the chemical equation for its reaction with ethanol; c) Name
the products formed d) Name the process involved in the reaction; e) How can we get back the
compound A from B.
23. Distinguish between homologous and analogous organs with one example each; define F1 and F2
generations; define the term variations.

24. Give reasons for the following: a) colour of sky is blue; b) Sun can be seen about two minutes before actual sunrise; c) traffic light signals are of red colour; d) stars appear to twinkle; e) planets do not twinkle.

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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