CBSE Class 10 Science Question Paper SA1 2010 (1)

CBSE Class 10 Science Question Paper SA 1 2010 (1). 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.

SCIENCE (Theory)

SECTION - A

1. What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes? 

2. State two characteristic features of carbon which when put together give rise to a large number of carbon compounds. 

3. Explain why a ray of light passing through the centre of curvature of a concave mirror gets reflected along the same path.

4. What is the nature of the image formed by a concave mirror if the magnification produced by the mirror is + 3 ? 

5. A charged particle enters at right angles into a uniform magnetic field as shown. What should be the nature of charge on the particle if it begins to move in a direction pointing vertically out of the page due to its interaction with the magnetic field ? 

6. Name the part of our eyes that helps us to focus near and distant objects in quick succession. 

7. What happens when an aqueous solution of sodium sulphate reacts with an aqueous solution of barium chloride? State the physical conditions of reactants in which the reaction between them will not take place. Write the balanced chemical equation for the reaction and name the type of reaction. 

8. What is the main constituent of biogas ? How is biogas obtained from biomass ? Write any two advantages of using this gas.

10. What is a solenoid ? Draw the pattern of magnetic field lines of a solenoid through which a steady current flows. What does the pattern of field lines inside the solenoid indicate ? 

11. A coil of insulated wire is connected to a galvanometer. What would be seen if a bar magnet with its north pole towards one face of the coil is

   (i) moved quickly towards it,

   (ii) moved quickly away from the coil and

   (iii) placed near its one face ?

Name the phenomenon involved. 

12. Mention any four limitations in harnessing wind energy on a large scale. 

13. At what distance should an object be placed from a convex lens of focal length 18 cm to obtain an image at 24 cm from it on the other side. What will be the magnification produced in this case ? 

14. No chemical reaction takes place when granules of a solid, A, are mixed with the powder of another solid, B. However when the mixture is heated, a reaction takes place between its components. One of the products, C, is a metal and settles down in the molten state while the other product, D, floats over it. It was observed that the reaction is highly exothermic.

  (i) Based on the given information make an assumption about A and B and write a chemical equation for the chemical reaction indicating the conditions of reaction, physical state of reactants and products and thermal status of the reaction.

  (ii) Mention any two types of reactions under which above chemical reaction can be classified. 

15. Name the functional group of organic compounds that can be hydrogenated. With the help of suitable example explain the process of hydrogenation mentioning the conditions of the reaction and any one change in physical property with the formation

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