CBSE Class 10 Science Question Paper SA 2 2012 (10)

CBSE Class 10 Science Question Paper SA 2 2012 (10). Students can download the last year question papers using the link below. Free download of examination question papers with solutions. Last 10 year question papers should be practised to get better marks in examinations.

SECTION  - A

1.   What is meant by near point of a human eye ? 

2.  Draw the electron dot structure of CH₃Cl .                                                  

3. Which one of the following  belonging to a food chain is likely  to have maximum  concentration of harmful  non-biodegradable chemicals in its body ?Phytoplankton,  fish, kingfisher.

4.  Name the compounds responsible for depletion of ozone layer.                                         

5.  To get a real and inverted image of same size as that of the object by a thin convex lens of focal length 29 cm, where should the object be placed ? Draw ray diagram to show image formation in this case.

6. While sitting in the last row, a student has difficulty in reading the black board clearly.State the defect of vision the student is suffering from. Mention  two causes of this defect. Suggest a suitable lens for the correction of this defect.

7.State the main role of decomposers in the ecosystem. Name any two decomposer

8. Name the hormone secreted by testis. The testis  are situated out side the abdomen in human male. Give reason .

9. State the reason why -

(a) Elements of the same group have similar chemical properties.

(b) Elements of the same period have different chemical properties.

10. Two elements 'X' (atomic number 7) and 'Y' (atomic number 15) belong to group 15 ofthe periodic table . Write the electronic configuration of these elements. Which of these will  be more electronegative and why ?

11. Burning of Coal and petroleum pollute the environment . Justify this statement.

12. State the mode of reproduction  in following  organisms Earthworm,  Frog, Rhizopus, Plasmodium

13. The sky appears reddish during sunrise and bluish in the day time. Why ?                      

14. An  organic compound X is an essential constituent of wine and bear. X is responsible for the intoxication  caused by these drinks.   Oxidation  of X yields an organic acid Y which is  present in vinegar. Name the compounds X and Y and write their structural

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