SOME NATURAL PHENOMENON 8

Practice Paper

Subject Physics

Class VIII          Ch- SOME NATURAL PHENOMENON                  

1. Mention two causes of earthquakes other than movements of tectonic plates?
2. What are the zones, where the earthquakes are likely to occur on the earth crust called?
3. What is Tsunami?
4. What happens, when an ebonite rod rubbed with wool is brought near a positively charged glass rod?
5. Which scale is used to measure the intensity of an earthquake? 
6. What is an electroscope? 
7. What is lightning? 
8. During the lightning, flash appears first than thunder while both are coming from the same place, why?
9. What happens when an ebonite rod is rubbed with wool?
10. What is the nature of the charges generated due to rubbing?
11. What is meant by 'electrification by friction'?
12. Mention two hazards caused by earthquake.
13. What is seismograph? 
14. List two places in India which are most threatened by earthquake.
15. What are tectonic plates?
16. What is a lightning conductor? 
17. What is earthing? 
18. What is a thunderstorm? How is it produced?
19. What is an earthquake?
20. We can easily charge non-metals like rubber, woollen clothes, plastics, etc. whereas we cannot charge a copper rod by rubbing easily. Why?
21. State the methods of charging an uncharged body.
22. Explain the process of an electric discharge?
23. What causes an earthquake? Which scale is used to measure an intensity of an earthquake?
24. Suggest three measures to protect ourselves from lightning.
25. Draw the diagram of an instrument, which can be used to detect the charge on a body. How it can be charged through 
26. conduction? 
27. Suppose you are outside your home and an earthquake strikes. What precaution would you take to protect yourself? 
28. Suppose you are at your home and an earthquake strikes. What precaution would you take to protect yourself? 
29. What is earthing? Why earthing is provided in buildings?
30. Explain briefly the process of lightning.
31. State the charge (positive or negative) produced by friction in each of following pairs :-(i) Fur and plastic rod. (ii) Wool and an ebonite rod.(iii) Glass rod and silk.(iv) Fur and rubber rod.(v) Fur and the glass rod.
32. What are the causes of earthquake? Explain briefly two hazards caused by an earthquake
33. Describe with the help of a diagram an instrument which can be used to detect a charged body ?
34. A crackling sound is heard while taking off sweater during winters. Explain ?
35. Explain the various types of charges ?
36. What is lightning. Explain the experiment conducted by Benjamin Franklin that showed sparks shared some similarity with lightning ?
37. What is earthing. Explain why a charged body loses its charge if we touch it with our hand ?
38. Why is earthing provided? 
39. What is a lightning conductor.Explain ?
40. What is an earthquake ?
41. What are main causes of an earthquake ?
42. What do you mean by seismic or fault zone ?
43. List the places in India where earthquakes are more likely to strike ?
44. What is a Seismograph. Explain?
45. Suppose you are inside your home and an earthquake strikes. What precaution would you take to protect yourself?
46. If you are outdoors at the time of earthquake .What precaution would you take to protect yourself ?