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Some Natural Phenomena

Question

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What is an earthquake? How is it measured?

Solution

Sudden trembling and shaking of the earth lasting for a very short time is an earthquake.

Due to sudden movements in the uppermost layer of the earth, the earth starts trembling. This movement of earth is called an Earthquake.

The magnitude of the earthquake is measured through an instrument called seismograph and it is measured on Richter scale.

Some More Questions From Some Natural Phenomena Chapter

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?

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?

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