Question

I. One word:
1. Name the point on the earth crust just above the point in the deep
crust from where the earthquake begins
2. Name the device which protects the building against the damage
from lightening.
3. Name the device which can detect the presence of charge on a body.
4. Which type of charge is acquired by glass rod when it is rubbed with
silk cloth?
5. Give example of an earthquake prone area
6. Name the scale that measures the magnitude of earthquake

II. Give reasons:
1.houses of seismic zones are made up of mud or timber.
2. When two bodies are charged by rubbing them together they acquire
equal and opposite charge
3. It is safer to use mobile phones rather than landline during
thunderstorm.
4. During an earthquake, one should move out from the buildings to a
clear spot like open ground.
5. Nylon clothes crackles as you undress
6. Stay away from electric poles or metal objects during thunderstorm

Ill. Answer the following questions:

1. Write four precautions that should be taken by a person to prevent
himself from any injury that can be caused during lightening.
2. What happens when lightning strike a conducting material?
3. What measures should be taken to minimize the damage caused by
an earthquake
4. What happens when you touch the electroscope with your hand?
Give reason
5. What is faulty zone?
6. An object A repels an object B but attracts another object C. C repels
D. if D is positively charged, what kind of charge would be on B. Give
reason to support your answer.
7. How lightening is caused?

Answer 1

1. He or she should stand outside while lighting. He should not use mobile phones. He should not touch any steel things. He should not were any steel or silver ornaments.
2.(IN DOUBT)
3. We should plant trees.
(REST ALL IN DOUBT)
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