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Some Natural Phenomena
What causes an earthquake? Draw a suitable diagram also.
Disturbance deep under the crust of the earth causes earthquake. The uppermost layer of the earth is made with plates. These plates keep on moving. When these plates collide with each other, or when they slide up or down the other plate or move away, it causes earthquake. 
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Name the scale on which the destructive energy of an earthquake is measured. An earthquake measures 3 on this scale. Would it be recorded by a seismograph? Is it likely to cause much damage?
Suggest three measures to protect ourselves from lightning.
Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?
Describe with the help of a diagram an instrument which can be used to detect a charged body.
If two pens made of the same material are rubbed against dry hair and brought closer to each other, will they attract or repel each other?
What kind of electric charge gets developed on the glass rod, when it is rubbed with a piece of silk cloth?
What is lightning?
What is the cause of lightning?
How a huge energy is produced during thunderstorm?
What is the process of meeting of negative charges from clouds with positive charges from ground to release huge energy called?
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