CBSE Class 10 Science Question Paper SA 2 2012 (11)

CBSE Class 10 Science Question Paper SA 2 2012 (11). 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 would  be the structure of ethanoic acid which has formula  CH3COOH.

2.      "The magnification of a mirror  is +1".  Comment on the statement

3.      Give two examples to emphasise the concept of REUSE.

4.      Name any two stake holder's who derive benefit from forests.                                

5.      (a)    In which of the given media, light moves the fastest  ? 

Medium    Refractive index

Water              1.33

Ice                   1.31

Alcohol            1.36

(b)    Using above table, calculate the velocity of light in water.  Given velocity of light in air is 3 x 108 m/s.

6.    "The maximum  concentration of harmful  chemicals accumulates in human beings". State the phenomena involved  and justify this statement.

7.      Coal and petroleum are considered fossil fuels.  Why ? Name two elements other than carbon and hydrogen which are responsible for the acid rains when these fuels burn.

8.  a)    State the significance of variation in reproduction.

(b)    Mention the principle  of regeneration.

9.   (a)    Name two bacterial infections. 

(b)    How do oral pills prevent pregnancy ?

10.   How does the electronic configuration  of an atom relate to its position in the modern periodic table ?

11.   (a)    Atomic  number is considered to be a more appropriate parameter than atomic mass for classification of elements in a periodic table.  Why ?

(b)    How does metallic character of elements vary on moving from

(i)      Left to right in a period, and

(ii)     From top to bottom in a group ?

12.   Mention the reason for the following  phenomena :                                             

(i)      Dispersion of light

(ii)     Twinkling  of stars

(iii)    Tyndall  effect

(iv)    Blue colour of the sky.

Please click the link below to download pdf file of CBSE Class 10 Science Question Paper SA 2 2012 (11).