CBSE Class 10 Science Question Paper SA 1 2011 (11)

CBSE Class 10 Science Question Paper 2012 (11). 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. Hydrogen being a highly inflammable gas and oxygen being a supporter of combustion, yet water which is a compound made up of hydrogen and oxygen is used to extinguish fire.Why ?

2. Name metal which react with a very dilute HNO3 to evolve hydrogen gas. HNO3

3. List two practical uses of biogas in rural areas.

4. In a circuit if two resistors of 5 om and 10 omare connected in series, compare the current passing through the two resistors. 

5. Write chemical equations that shows aluminium oxide reacts with acids as well as base.

6. A student dropped few pieces of marble in dilute HCl contained in a test tube. The evolved gas was passed through lime water.

    (i) What change would be observed in lime water ?

    (ii) Write balanced chemical equation for the above change. 

7. When a solution of potassium iodide is added to a solution of lead nitrate in a test tube, a reaction takes place.

    (a) What type of reaction is this ?

    (b) Write a balanced chemical equation to represent the above reaction

8. Define combination reaction. Give one example of a combination reaction which is also exothermic.

9. List four common features of the respiratory organs in aquatic and terrestrial animals ?

10. Why is charcoal considered to be a better fuel than wood ?

11. The element of an electric heater becomes red hot when the current is switched on while it is not so for the current carrying wires in the circuit. Explain, why ?

12. Describe an activity to draw the magnetic field produced around a current carrying straight conductor

13. A current of 5.0 A flows through a 12 om resistor. What is the rate at which heat energy is produced in the resistor ?

14. You might have noted that when copper powder is heated in a china dish, the surface of copper powder becomes coated with a black colour substance

    (i) How has this black coloured substance formed ?

    (ii) What is that black substance.

    (iii) Write the chemical equation of the reaction that takes place. 

15. What is Baking soda chemically called ? Give reaction involved in its preparation. Write one of its uses.

16.(a) What is an alkali ? Give an example.

   (b) Why do HCl, HNO3 etc show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character.

17. What is the function of receptors in human body? What are the types of receptors found in humans? What problems are likely to occur if receptors do not work properly?

18.(a) Explain how auxins help in bending of plant stem towards light.

     (b) State the objective of the experiment for which experimental set up is shown in the given diagram. 

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