CBSE Class 10 Science Question Paper SA 2 2012 Set 17

CBSE Class 10 Science Question Paper SA 2 2012 (17). 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.    Why is the refractive index of atmosphere different at different altitudes ? 

2.    Name the functional  group present in propanal (C₃H₆0)                                      

3.    Which of the following  in a food chain will  have maximum  concentration of harmful  chemicals in its body ?

        Small fish, Zooplankton,  Bird, Phytoplankton

4.    Why is ozone layer getting depleted at the higher level of the atmosphere ? 

5.    A boy uses spectacles of focal length -60 cm. Name the defect of vision he is suffering from.  Which lens is used for the correction of this defect ?  Compute the power of this lens.

6.   0ne  portion  of a convex lens is covered as shown, will  the lens produce a complete image of the object ?  Describe in brief the characteristics of the image formed.

7.    State in brief the functions of following  parts of human eye : 

(a)    Iris                       (b)    Cornea               (c)    Ciliary Muscles           (d)    Pupil

8.      Why should coal and petroleum be used judiciously  ? What ill effects can be caused if  they are used non - judiciously  ?

9.      (a)    State Modern Periodic Law.                                                           

(b)    Elements A, B, C and D have atomic number 1, 8, 11 and 19 respectively. Choose the odd element and give reason for your answer.     Write the trend of atomic size and metallic character along a group and a period in the  modern periodic table.

Please click the link below to download pdf file of CBSE Class 10 Science Question Paper SA 2 2012 (17).