CBSE Class 10 Science Question Paper SA 2 2012 (15)

CBSE Class 10 Science Question Paper SA 2 2012 (15). 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.      Which   colour of  white light  suffers (i) least deviation and (ii) maximum  deviation when a beam of white light passes through a glass prism ?

2.      Write the name and structure of an aldehyde with  4 carbon atoms                            

3.      In a food chain comprising frogs, insects, birds and grass, which one of the organisms is likely  to have maximum   concentration of harmful  non biodegradable chemicals inits body ?

4.      State one advantage of using disposable paper cups over disposable plastic cups ?           

5.  Why does it take some time to see objects in a cinema hall when we just enter the hall

from bright sunlight ? Explain in brief.

6.(a)    What should be the position of the object, when a concave mirror  is to be used :    

(i)   as a shaving mirror,  and 

(ii) in torches producing parallel beam of light ? 

(b)    A man standing infront of a mirror, finds his image having a very small head and legs of normal size. What type of mirrors are used in designing such a mirror  ?

7.      Why does the colour of the sky appear blue ? Explain in brief.                              

8.(a)    Give reason: Regeneration is not the same as Reproduction.                           

(b)    State the mode of a sexual reproduction  in Plasmodium.

9. (a)    State the Modern Periodic Law.

(b)    Name the element which has twice as many electrons in its second shell as in its first shell. Write its electronic configuration  also.

10.(a)    Why do all the elements of the same group have similar chemical properties ?           

(b)    Why do all the elements of the same period have different properties ?

11.(a)    How can development of efficient engines ensuring complete combustion of fossil fuel be useful to us ?

(b)    Name the four elements that constitute fossil fuels.

12.   State in brief the role of the prostate gland and seminal vesicles in the male reproductive system ?

13.   (a)    State two disadvantages of converting forests into monocultures. 

(b)    Give any two advantages of water stored under ground.

Please click the link below to download pdf file of CBSE Class 10 Science Question Paper SA 2 2012 (15).