CBSE Class 10 Science Question Paper SA 1 2011 (14)

CBSE Class 10 Science Question Paper SA 1 2011 (14). 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. Write balanced equation for a chemical reaction that can be characterized as precipitation reaction as well as double displacement reaction.

2. Which gas is usually liberated when an acid reacts with a metal ?

3. Why is the box of a solar cooker covered with a glass plate ?

4. State the change in the ammeter reading observed when a resistance wire in a circuit is replaced by a wire of same material and same length but comparatively double cross-sectional area keeping the source of potential difference constant.

5. Write chemical equations for the reactions taking place when

    (i) zinc sulphide is heated in air

    (ii) calcination of zinc carbonate is done. 

6. (a) Why does blue vitriol change to white on heating ?

    (b) Write its formula. 

7. Write an equation each for decomposition reaction when energy is supplied in the form of : (i) heat and (ii) light. 

8. What would you observe when zinc is added to a solution of iron sulphate ? Name the type of reaction and write the chemical equation.

9. State the function of the guard cells. What will happen to the guard cells and stomatal pore when water flows to guard cells ?

10. There is an urgent need to harness non–conventional sources of energy. Explain.

11. A lamp rated 100 W at 220 V is connected to the mains electric supply.

    (i) What amount of current is drawn from the supply line if the voltage is 220 V ?

    (ii) What is its resistance?

12. A student performs an experiment to study the magnetic effect of current around a current carrying straight conductor with the help of a magnetic compass. He reports that  

   (i) the degree of deflection of the magnetic compass increases when the compass is moved away from the conductor.

   (ii) the degree of deflection of the magnetic compass increases when the current through the conductor is increased. Which of the above observations of the student appears to be wrong and why ?

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