CBSE Class 10 Science Question Paper SA 1 2011 (15)

CBSE Class 10 Science Question Paper SA 1 2011 (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.

SUMMATIVE ASSESSMENT - I (2011)

SCIENCE Class – X

SECTION-A 

1. Which one is a chemical change- rusting of iron or melting of iron ?

2. Why do silver articles become black after some time when exposed to air

3. Suggest any two reasons which make the large scale usage of nuclear energy prohibitive.

4. Mention any two factors on which the resistance of a cylindrical conductor depend.

5. Give reason : (i) Ionic compounds have high melting point

                        (ii) Ionic compounds are hard crystalline solids.

6. Write the chemical formula of baking soda. How is baking soda prepared ? Write the reaction which takes place when it is heated during cooking.

7.   (a) If an iron nail is immersed in the aqueous solution of copper sulphate, what are the changes happening to the nail and to the solution

    (b) Write the balanced chemical equation for the reaction between iron metal and aqueous copper sulphate solution. 

8. Give an example each for thermal decomposition and photo chemical decomposition reactions. Write relevant balanced chemical equations also.

9. What are the final products of carbohydrates, proteins and fats after their digestion.

10. A student constructed a model of box type solar cooker. Instead of using glass sheet he used a transparent plastic sheet to cover the open face of the box. He found that this cooker does not function well. What could be the possible drawbacks in his model ? Explain the advantage of painting black the inner and outer surfaces of the cooker and that of cooking vessels.

11. Calculate the electrical energy consumed by a 1200W toaster in 20 minutes. 

12. Why does a current carrying conductor experiences a force when it is placed in a magnetic field ? State Fleming’s left hand rule.

13. Why do the wires connecting an electric heater to the mains not glow while its heating element does ?

14. (a) Oil and fat containing food items are flushed with nitrogen while packing them why ?

      (b) Why do we apply paint on iron articles ? 

Please click the link below to download pdf file of CBSE Class 10 Science Question Paper SA 1 2011 (15)