CBSE Class 10 Science Question Paper SA 2 2012 (16)

CBSE Class 10 Science Question Paper SA 2 2012 (16). 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.  Name the type of spherical mirror  which                                                    

(a)    has +ve focal length.

(b)    always forms a virtual  image.

2. In which  group  of the periodic  table would  you place lithium  having atomic number    ?

3."'Reuse' of materials is considered better than 'recycling'".   Why ?                       

4."Save the Tiger" campaign is being over emphasised these days by our Government.What may be the possible reason ?

5. What causes atmospheric refraction of light ? Mention its two effects.                      

6. A small object is so placed in front of a convex lens of 5 cm focal length that its virtual image is formed at a distance of 25 cm from the lens. Find where is the object placed with  respect to the lens.

7.Refractive indices of media A, B, C and D are given below :                                 

Medium                     Refractive Index

A                                  1. 33                                   

B                                  1.44

C                                  1.52

D                                  1.65

In which  of these four is the speed of light  maximum  ? Support your answer with reason. Find the refractive index of medium D with  respect to medium A.

8.      What is meant by saponification ? Give an example.                                          

9.    State any two changes in the properties of I group elements of modern periodic table, if we move downwards.

10.   In the food chain-                              

Grass ----------  deer ----------  lion,

operating in a forest, what will  happen if all the

(a)    lions are removed ?

(b)    deers are removed ?

11.   "Testes perform dual function."  Justify this statement.                                      

12.   What is the information  source of making proteins in a cell nucleus? State the basic   event in reproduction.

Please click the link below to download pdf file of CBSE Class 10 Science Question Paper SA 2 2012 (16).