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Some Natural Phenomena
What is the relationship between the seismic zone and epicentre?
The point from where the shock-waves of an earthquake originate due to sudden movements is the seismic zone. The seismic zone or fault zone lies within the crust of the earth at a depth of about 60 km.
The point on the surface of the earth, vertically above the seismic focus is called epicentre.
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Write T against true and F against false in the following statements:
A charged glass rod attract a charged plastic straw.
Lightning conductor cannot protect a building from lightning.
Write T against true and F against false in the following statements:
Earthquakes can be predicted in advance.
Sometime, a crackling sound is heard while taking off sweater during winters. Explain.
Explain why a charged body loses its charge if we touch it with our hand.
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?
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