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1. Write Short notes on, (i) Electroscope, , (ii) Earthing, , (iii) Richter Scale., , A. (i) Electroscope- A device used to test, whether an object is carrying charge or not is, called an electroscope., , (ii) Earthing- The process of transferring of, charge from a charged object to the earth is, called earthing., , (iii) Richter Scale- The power of an earthquake, is expressed in terms of a magnitude on a scale, called Richter scale., , 2. What is an earthquake and where, earthquakes more likely to strike?, , A. An earthquake is a sudden shaking or, trembling of the earth which lasts for a very, short time. Earthquakes more likely to strike in, Kashmir, Rajasthan and Gujarat., , 3. What is lighting?, , A. It is the process of electric discharge, between cloud and the earth or between, different clouds., , 4. Suggest three measures to protect ourselves, from lightning., , A. (i) Do not use TV or cable phone during, lightning., , (ii) Stay indoor or under covered area., , (iii) Don’t take bath during lightning., , 5. Sometimes, a crackling sound is heard while, taking off a sweater during winters. Explain., , A. When we take out sweater, Woolen sweater, gets charged due to friction between the, sweater and the body. This results in crackling, sound., , 6. Explain why a charged body loses its charge, if we touch it with our hand?, , A. The charges get conducted to the earth, through our body when we touch it and the, conductor loses its charge. This phenomenon, is known as electric discharge, , 7. Suppose you are outside your home and an, earthquake strikes. What precaution would you, take to protect yourself?, , A. The following precautions should be taken, when earthquake strikes, , (a) Find and go to an open field and stay away, from buildings, trees, electric wire and poles., (b) If you are in a car, then drive to an open field, and do not come out of your car., , By-Sarfaraz Shaikh, , 2022-02-07