CBSE Class 10 Science Question Paper SA 1 2011 (2)

CBSE Class 10 Science Question Paper SA 1 2011 (2) 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 a balanced chemical equation for a chemical combination reaction. 

2. Why is carbon not used for reducing aluminium from aluminium oxide ?

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

4. Give observation and write chemical equation for reaction of sodium with water.

5. A knife, which is used to cut a fruit, was immediately dipped into water containing drops of blue litmus solution. If the colour of the solution is changed to red, what inference can be drawn about the nature of the fruit and why ?

6. What happens in a displacement reaction. Justify your answer giving one example.

7.What would you observe when.

(i) calcium oxide is added to water ?

(ii) barium chloride solution is added to sodium sulphate solution ? Write the reaction involved in each case. 

8. What is excretion ? How do unicellular organisms remove their wastes ?

9. Name the major constituent of biogas. List three characteristics to prove it as an excellent fuel.

10. A student while studying the force experienced by a current carrying conductor in a magnetic field records the following observations (i) The force experienced by the conductor increases as the current is increased (ii) The force experienced by the conductor decreases as the strength of the magnetic field is increased. Which of the two observations is correct and why ?

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