CBSE Science Practice Paper : Set XII
1. What is the contribution of Edwin Hubble to space science ? 1
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2. What is meant by instantaneous rate of reaction ? 1
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3. What are raw materials used for manufacture of glass ? 1
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4. Name the substance used as (i) a moderator and (ii) a coolant in a nuclear reactor. 1
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5. Write structural formula of ethanoic acid. 1
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6. Write the conditions under which light undergoes total internal reflection. 2
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7. Name an alloy used in the making of permanent magnets. Give two uses of these magnets. 2
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8. What is corrosion ? Give conditions in which rusting of iron takes place. 2
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9. How is bleaching powder manufactured ? Give one use of bleaching powder. 2
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10. A 40W, 220V bulb is connected to 110V supply, find (i) Current flowing in the filament, (ii) Power consumed.
A 60W, 220V bulb is connected to a 220V supply, find
(i) current (ii) Energy consumed in 1 hr. 2
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11. State two major objectives of space research programme in India also give its focal length. 3
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12. Write the nature of image formed by a plane mirror. 3
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13. Why is charcoal considered a better fuel than wood ? What are disadvantages of converted wood into charcoal ?
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What are amalgams ? Give two examples. Give two uses of amalgams. 3
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14. What is a fuse wire ? Name the materials used in making the fuse wire. How it is connected in the house ? How the connection differs from the normal connection used for other devices?
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What is solar cooker ? What is the range of temperature produced in 2-3 hours of use ? Give two
limitations and advantages. 3
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15. Discuss refraction in a glass slab and hence write the basic laws of refraction. 3
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