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Answer :

The destructive energy of an earthquake is measured by the Richter scale.

This scale has readings from 1 to 10.

Seismograph can measure an earthquake of magnitude 3 on the Richter scale.

If the Richter scale gives a reading of magnitude 3, then the earthquake is not likely to cause much damage. Generally, earthquakes of magnitude, higher than 5 is considered destructive in nature.

- Select the correct option in Questions 1 and 2. Q.1 Which of the following cannot be charged easily by friction? (a) A plastic scale (b) A copper rod (c) An inflated balloon (d) A woollen cloth.
- Q.2 When a glass rod is rubbed with a piece of silk cloth the rod (a) and the cloth both acquire a positive charge. (b) becomes positively charged while the cloth has a negative charge. (c) and the cloth both acquire a negative charge. (d) becomes negatively charged while the cloth has a positive charge
- Q.3 Write T against true and F against false in the following statements. (a) Like charges attract each other. (b) A charged glass rod attracts a charged plastic straw. (c) Lightning conductor cannot protect a building from lightning. (d) Earthquakes can be predicted in advance.
- Q.4 Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain.
- Q.5 Explain why a charged body loses its charge if we touch it with our hand.
- Q.7 Suggest three measures to protect ourselves from lightning.
- Q.8 Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?
- Q.9 Describe with the help of a diagram an instrument which can be used to detect a charged body.
- Q.10 List three states in India where earthquakes are more likely to strike.
- Q.11 Suppose you are outside your home and an earthquake strikes. What precaution would you take to protect yourself?
- Q.12 The weather department has predicted that a thunderstorm is likely to occur on a certain day. Suppose you have to go out on that day. Would you carry an umbrella? Explain.

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