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Posted By: Aishwarya Member Level: Gold Posted Date: 24 Sep 2008
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2007 CBSE CBSE Science Practice Paper : Set XII Question paper
Section - A
1. What is the contribution of Edwin Hubble to space science ? 1
Answer :
2. What is meant by instantaneous rate of reaction ? 1
Answer :
3. What are raw materials used for manufacture of glass ? 1
Answer :
4. Name the substance used as (i) a moderator and (ii) a coolant in a nuclear reactor. 1
Answer :
5. Write structural formula of ethanoic acid. 1
Answer :
6. Write the conditions under which light undergoes total internal reflection. 2
Answer :
7. Name an alloy used in the making of permanent magnets. Give two uses of these magnets. 2
Answer :
8. What is corrosion ? Give conditions in which rusting of iron takes place. 2
Answer :
9. How is bleaching powder manufactured ? Give one use of bleaching powder. 2
Answer :
10. A 40W, 220V bulb is connected to 110V supply, find (i) Current flowing in the filament, (ii) Power consumed.
OR
A 60W, 220V bulb is connected to a 220V supply, find
(i) current (ii) Energy consumed in 1 hr. 2
Answer :
11. State two major objectives of space research programme in India also give its focal length. 3
Answer :
12. Write the nature of image formed by a plane mirror. 3
Answer :
13. Why is charcoal considered a better fuel than wood ? What are disadvantages of converted wood into charcoal ?
OR
What are amalgams ? Give two examples. Give two uses of amalgams. 3
Answer :
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?
OR
What is solar cooker ? What is the range of temperature produced in 2-3 hours of use ? Give two
limitations and advantages. 3
Answer :
15. Discuss refraction in a glass slab and hence write the basic laws of refraction. 3
Answer :
16. Explain the working of a dry cell with a neat diagram. 3
Answer :
17. At 298 K, the equilibrium concentration of the reactants and products for the reaction :
H2(g) +I2 (g)= 2HI (g) are as follows :
[HI] = 0.49 M, [H2] = 0.080 M, [I2] = 0.060 M.
Calculate the equilibrium constant at this temperature. 3
Answer :
18. What are enzymes ? Name the enzymes required for fermentation of sugarcane to ethanol. Which gas is evolved during the process of fermentation ? How is ethanol prepared from ethene ? Give two uses of ethanol. 3
Answer :
19. Derive Len’s formula. Define magnification. Relate HI, v,/for a lens. Use it to find the position of an Image formed by a convex lent of focal length 20 cm and magnified 2 times.
OR
Derive mirror formula. Define magnification. Relate m , v and/for a concave mirror. Use it to find the
position of an image formed by a concave mirror of focal length 20 cm and magnified 2 times. 3+2
Answer :
20. Write three physical and three chemical properties of methanoi. Write chemical reactions involved. 5
Answer :
Section - B
21. What is the source of free oxygen given out by the plants ? 1
Answer :
22. Name a phytohormone which is a growth inhibitor. 1
Answer :
23. What is self-pollination and cross-pollination ? 1
Answer :
24. Write short notes on : (a) tubectomy and (b) vasectomy. 2
Answer :
25. Explain why there are changes of accumulation of harmful chemicals in the body of human beings. 2
Answer :
26. Give the difference between point sources and non-point sources. 3
Answer :
27. Write the functions of (a) Testis, {b) Ovaries, © Epididymis. 3
Answer :
28. What are the various methods of vegetative propagation ? Discuss any one method. 3
Answer :
29. Why is the DNA molecule compared to a spiralling staircase ? Which three components make up the nucleotide ? 3
Answer :
30. Draw a well-labelled diagram to explain the excretory system of man.
OR
Draw a well-labelled diagram to explain the respiratory system of man. 5
Answer :
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