CBSE Class 10 Science Question Paper SA 1 2011 (5)

CBSE Class 10 Science Question Paper SA 1 2011 (5). 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.

SUMMATIVE ASSESSMENT - I (2011)

SCIENCE Class – X

SECTION-A

1. Name a non-metal which is lustrous and a metal which is non–lustrous.

2. Bio – gas is also known as gobar gas. Justify.

3. Name the instrument used to measure electric current in a circuit.

4. What is an alloy ? State the constituents of solder. Which property of solder makes it suitable for welding electrical wires.?

5. State the chemical name of plaster of Paris ? Write a chemical equation to show the reaction between plaster of Paris and water.

6. (a) A solution of substance ‘X’ is used for white washing. What is the substance ‘X’ ? State the chemical reaction of ‘X’ with water

    (b) Why does the colour of copper sulphate solution change when an iron nail is dipped in it ?

7. (a) Balance the following chemical equations :

    (i) BaCl₂+H2SO₄->BaSO₄+HCl

    (ii) Ca(OH)₂+HNO₃->Ca(NO3) ₂+H₂O

    (iii) Pb(NO3)₂-> PbO+NO₂+O₂

    (iv) MnO₂+HCl->MnCl₂+H₂O+Cl₂

8. State two differences between arteries and veins.

9. Give reasons for the following :

    (a) Why is diffusion is not sufficient to meet the oxygen requirements of all the cells in multicellular organisms ?

    (b) How desert plants perform photosynthesis if their stomata remain closed during the day ? 

Please click the link below to download pdf file of CBSE Class 10 Science Question Paper SA 1 2011 (5)