CBSE Class 10 Science Question Paper SA1 2010 (3)

CBSE Class 10 Science Question Paper SA 1 2010 (3). 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 is  thermite  reaction  ?

2.      White silver chloride turns grey in sunlight why ?

3.      Name two sources of energy which  are pollution free.

4.      Nichrome is used to make the element of electric heater. Why ?

5.      The atomic  number of magnesium  is  12 and of chlorine  is  17. Show  the formation of magnesium  chloride  by the transfer of electrons.

6.      Why do surfaces of aluminium vessels acquire a dull appearance when exposed to air ?

7.   (a)    Define photochemical  reaction.

(b)    Write the balanced equation  for the following reaction  and identify  the type of reaction. Potassium bromide + Barium Iodide  ---  Potassium iodide + Barium bromide.

8.      What is  the colour  of FeS0₄.    7H₂0  crystals ?   How  does this  colour  change upon heating  ? Give  balanced chemical  equation  for the changes.

9.  Stomata of desert plants remain closed during day time.  How do they take up carbon dioxide and perform photosynthesis  ?

10.   Give the disadvantages of constructing big dams across the river. How does construction of dams across the river get linked with production of green house gases  ?.

Please click the link below to download pdf file of CBSE Class 10 Science Question Paper SA 1 2010 (3).