» CBSE Science Practice Paper : Set I : CBSE Sample Question Papers

Section - A

1. Name the mirror which always forms a virtual image ?
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2. How is slurry left over after generation of biogas in gobar gas plant used ?
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3. Write a condition necessary for current flow.
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4. Define rate of reaction.
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5. How much solar energy is incident on India’s surface (on an average) ?
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6. Which one of the metals in the following group are : (a) most reactive and (b) least reactive Au, Na, Cu, Ca.
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7. How do we see colours ?
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8. Define ‘combustion’. Write the conditions necessary for combustion to take place.
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9. What is energy crisis ? How do we overcome the same ?

OR
What are the advantages and drawbacks in the use of wind energy ?
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10. When two equal resistors are placed in parallel, the equivalent resistance is 5 Q. When they are placed in series, what will be the equivalent resistance ?
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11. State two reasons for counting sulphur among the non-metals. Which properties of sulphur make it possible to bring sulphur from deep mine to the surface of the Earth by the Frasch process and to purify it by sublimation of liquid sulphur ?
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12. What are Geostationary satellites ? In what way they are useful to mankind ?
OR
Explain why nuclear fusion is better than nuclear fission ?
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13. The heat produced on complete combustion of 10 g of fuel could raise the temperature of 2 Kg of water from 20° to 70°C. Calculate the calorific value of the fuel, if the specific heat of water is 4.2 J/g °C.

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How much energy will 1 Kg mass of wood yield on complete combustion if its calorific value is 15 kJ/g.
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14. Draw a neat diagram of a compound microscope and explain the nature of image formed. Also write the relation for magnification.
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15. What are magnetic field lines ? List four characters of these lines.
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