CBSE Class 10 Science Question Paper SA 2 2012 (9)

CBSE Class 10 Science Question Paper SA 2 2012 (9). 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.      When a beam of white light passes through a glass prism, state the component of white  light which deviates the (i) least (ii) most.

2.      "Saturated hydrocarbons burn with a blue flame while unsaturated hydrocarbons burn

3.      List two main components of our environment                                                 

4.      Define the term biological magnification..                                                  

5.      (i)      Why does the sun appear reddish early in the morning ?                             

(ii)     Why does the sky appear dark instead of blue to an astronaut ?

6.    An object is placed at a distance of 10 cm from a concave mirror. If its image is observed  at 6cm from the mirror.  Calculate focal length of the mirror.

7.  (a)    "Sun is the ultimate source of energy of fossil fuels", justify this statement.      

(b)    Write two disadvantages of using fossil fuels.

8.  (i)      Write the values of far point and near point of the human eye with normal vision.  

    (ii)     What happens to the image distance from the eye lens in the normal eye when we increase the distance of an object from the eye ?

9.      State Modern Periodic Law. How  many groups and period are there in the modern  Periodic table ?

10.   An element X is placed in group 14. State the formula and the nature of bonding in its  chloride. Draw its electron dot structure of its chloride.

11.   Suggest two important  measures to reduce consumption  of the various natural  resources.

12.   List any two reasons for adopting contraceptive methods.                                      

13.   Illustrate the process of regeneration in Planaria with  the help of a suitable diagram.      

14.   (i)      Define power of a lens and write its S.I unit

(ii)     A convex lens of power 4D is placed at a distance of 40 cm from a wall. At what distance from the lens should a candle be placed so that its image is formed on the wall ?

15.   A person is unable to see objects nearer than 50 cm. He wants to read a book placed at       3 a distance of 25 cm . Name the defect of vision he is suffering from. How  can it be corrected ? Draw ray diagrams for (i) the defective eye ,(ii) its correction using a suitable corrective lens.

Please click the link below to download pdf file of CBSE Class 10 Science Question Paper SA 2 2012 (9).