CBSE Class 10 Science Delhi Question Paper 2013 (1)

CBSE Class 10 Science Delhi Question Paper 2013 (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 AND TECHNOLOGY (Theory)

1. A green layer is gradually formed on a copper plate left exposed to air for a week in a bathroom. What could this green substance be ? 

2. Name a metal which offers higher resistance to the passage of electricity than copper. 

3. Give an example of photochemical reactions. 

4. Why is tungsten metal selected for making filaments of incandescent lamp bulbs. 

5. Where will the image be formed by concave mirror when an object is placed  between the pole and the focus point of the mirror ? 

6. Draw diagrams to distinguish between 'equatorial orbit' and 'polar orbit' of artificial satellites of earth.

7. What is the activity series of metals ? Rearrange the following metals in an increasing order of reactivity : Aluminium, Zinc, Mercury 

8. How is plaster of Paris chemically different from gypsum ? How may they be interconverted ? Write one use of plaster of Paris. 

9. What is the cause of release of unusually large energies in unclear fission reactions ? How is the energy per fission calculated ? 

10. With respect to air the refractive indices of ice is 1.31 and that of rock salt is 1.54. Calculate the refractive index of rock salt with respect to ice. 

11. (a) Write the chemical equation representing the reaction for the preparation of methanal from methanol.

     (b) What happens when methanal is mixed with :

     (i) Ammoniacal silver nitrate solution and the mixture is warmed.

     (ii) Fehling's reagent and the mixture.

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