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CBSE Class 10th Biology Question Paper 2013

Section-A
1. How many vertical columns are there in the modern periodic table and what are they called? [1]

2. What is speciation? [1]

3. Why should biodegradable and non-biodegradable wastes be discarded in two separate dust bins?

4. “The chromosome number of the sexually reproducing parents and their offspring is the same.” Justify this statement. [2]

5. “A ray of light incident on a rectangular glass slab immersed in any medium emerges
parallel to itself.” Draw labelled ray diagram to justify the statement. [2]

6. We often observe domestic waste decomposing in the bylanes of residential colonies.
Suggest ways to make people realize that the improper disposal of waste is harmful to
the environment. [2]

7. List and explain any two advantages associated with water harvesting at Community
level. [2]

8. Write the name and the structural formula of the compound formed when ethanol is
heated at 443K with excess of conc. H2SO4. State the role of conc. H2SO4 in this reaction. Write chemical equation for the reaction. [3]

9. Why homologous series of carbon compounds are so called? Write chemical formula of two consecutive members of a homologous series and state the part of these compounds that determines their (i) physical properties, and (ii) chemical properties. [3]

10. Given below are some elements of the modern periodic table :
4Be, 9Fe, 14Si, 19K, 20Ca [3]
(i) Select the element that has one electron in the outermost shell and write its electronic configuration.
(ii) Select two elements that belong to the same group. Give reason for your answer.
(iii) Select two elements that belong to the same period. Which one of the two has bigger atomic size?

11. Write the number of periods the modern periodic table has. How do the valency and
metallic character of elements vary on moving from left to right in a period? How do the
valency and atomic size of elements vary down a group? [3]

12. (a) Explain the process of regeneration in Planaria.
(b) How is regeneration different from reproduction? [3]

13. Write two example each of sexually transmitted diseases caused by
(a) Virus (B) bacteria.
Explain how the transmission of such diseases be prevented? [3]

14. Tabulate two distinguish features between acquired traits and inherited traits with one
example of each. [3]

15. “The sex of a newborn child is a matter of chance and none of the parents may be
considered responsible for it.” Justify this statement with the help of flow chart showing
determination of sex of a newborn. [3]

16. Mention the types of minor used as (i) rear view mirror, (ii) shaving mirrors. List two
reasons to justify your answer in each case. [3]

17. An object of height 6cm is placed perpendicular to the principal axis of a concave lens of
focal length 5cm. use lens formula to determine the position, size and nature of the
image if the distance of the object from the lens is 10cm. [3]

18. State the difference in colours of the sum observed during sunrise/sunset and noon. Give
explanation for each. [3]

19. (a) What is an ecosystem? List its two main components.
(b) We do not clean ponds or lakes, but an aquarium needs to be cleaned regularly.
Explain. [3]

20. (a) Define the term ‘isomers’.
(b) Draw two possible isomers of the compound with molecular formula C3H6O and
write their names.
(c) Give the electron dot structures of the above two compounds. [5]

21. (a) List three distinguishing features between sexual and asexual types of reproduction.
(b) Explain why variations are observed in the offsprings of sexually reproducing
organisms? [5]

22. (a) Identify A, B and C in the given diagram and write their
functions.
(b) Mention the role of gamete and zygote in sexually reproducing
organisms.
23. (a) State the laws of refraction of light. Give an expression to relate the absolute
refractive index of a medium with speed of light in vacuum.
(b) The refractive indices of water and glass with respect to air are 4/3 and 3/2
respectively. If the speed of light in glass is 8 1 2 10 ms, find the speed of light in (i)
air, (ii) water. [5]

24. (a) A person cannot read newspaper placed nearer than 50cm from his eyes. Name the
defect of vision he is suffering from. Draw a ray diagram to illustrate this defect.
List its two possible causes. Draw a ray diagram to show how this defect may be
corrected using a lens of appropriate focal length.
(b) We see advertisements for eye donation on television or in newspapers. Write the
importance of such advertisements. [5]

Section-B
25. A student takes 2ml acetic acid in a dry test tube and adds a pinch of sodium hydrogen
carbonate to it. He makes the following observations:
I. A colourless and odourless gas evolves with a brisk effervescence.
II. The gas turns lime water milky when passed through it.
III. The gas burns with an explosion when a burning splinter is brought.
IV. The gas extinguishes the burning splinter that is brought near it.
The correct observations are:
(A) I, II and III
(B) II, III and IV
(C) III, IV and I
(D) IV, I and II [1]

26. In an experiment to study the properties of acetic acid a student takes about 2ml of
acetic in a dry test tube. He adds about 2ml of water to it and shakes the test tube well.
He is likely to observe that:
(A) The acetic acid dissolves readily in water
(B) The solution becomes light orange
(C) Water floats over the surface of acetic acid
(D) Acetic acid floats over the surface of water [1]

27. A student prepared 20% sodium hydroxide solution in a beaker containing water. The
observation noted by him are given below.
I. Sodium hydroxide is in the form of pellets.
II. It dissolves in water readily.
III. The beaker appears cold when touched from outside.
IV. The red litmus paper turns blue when dipped into the solution.
The correct observations are:
(A) I, II and III
(B) II, III and IV
(C) III, IV and I
(D) I, II and IV [1]

28. Read the following statements:
I. When a red litmus paper is dipped into reaction mixture of a saponification reaction, it
turns blue and the reaction is exothermic.
II. When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its
colour does not change and the reaction is exothermic.
III. When a red litmus paper is dipped into reaction mixture of a saponification reaction, its
colour does not change and the reaction is endothermic.
IV. When a blue litmus paper is dipped into reaction mixture of a saponification reaction, its
colour does not change and the reaction is endothermic.
Which of the above statement are correct:
(A) I and II
(B) II and III
(C) III and IV
(D) I and IV [1]

29. Hard water required for an experiment is not available in a school laboratory. However,
following salts are available in the laboratory. Select the salts which may be dissolved in
water to make it hard for experiment.
(1) Calcium Sulphate (3) Calcium Chloride
(2) Sodium Chloride (4) Potassium Sulphate
(6) Magnesium Chloride (5) Magnesium Chloride

Attached Files

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