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Some Natural Phenomena

Question

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How is the magnitude of earthquake expressed?

Solution

The power of an earthquake is expressed in terms of a magnitude on a scale called Richter scale. The earthquakes measuring upto 3 on the richter scale are said to be mild and do not cause any damage. Such mild earthquakes are sometimes not even noticed. On the other hand the earthquakes measuring 8 or more on richter scale are very severe and can destroy entire cities or villages. Large scale destruction is caused by such earthquakes.

Some More Questions From Some Natural Phenomena Chapter

When a glass rod is rubbed with a piece of silk cloth the rod

Write T against true and F against false in the following statements:

Like charges attract each other.

Write T against true and F against false in the following statements:

A charged glass rod attract a charged plastic straw.

Write T against true and F against false in the following statements:

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?

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