Would the lightning conductor be still effective? Switch off the tube light so that the room is completely dark. The place in the interior of the earth where an earthquake occurs is the focus, and the region on the surface of the earth that is the closest to focus is likely to experience the largest damage. . If a thunderstorm occurs there is always a possibility of lightning and cyclones accompanying it. Destructive energy of an earthquake is measured on the Richter scale.
Now the clip is touched gently by our hand. Take a paper strip roughly 10 cm × 3 cm. So now you don't have to worry about whether or not you will be able to solve all the questions. An earthquake measures 3 on this scale. The friction charges the particles in the atmosphere. If now another charged object carrying equal amount of prositive charge is brought in contact with the clip, what will happen? When the magnitude of the accumulated charges become large, the air cannot resist their flow. Question 17 If air and cloud were good conductors of electricity, do you think lightning could occur? Protect your head with a pillow.
What will happen if they are brought near each other? You might have seen videos showing trees catching fire due to lightning. The energy released at the focus of an earthquake, propagates outwardly in form of waves known as seismic waves. Explain why a charged body loses its charge if we touch it with our hand. Question Bank - Some Natural Phenomena notes for Class 8 is made by best teachers who have written some of the best books of Class 8. Write a brief report, explaining its working. Download revision notes for Some Natural Phenomena class 8 Notes and score high in exams.
If you are in bed, do not get up. You might have lost count I'm sure. Protective measures are of utmost importance during lightning strikes. These are the Some Natural Phenomena class 8 Notes prepared by team of expert teachers. The mantle consists of semi-solid material above which the crust floats. The students should practice the questions database to get better marks in examination. What will happen to the strips? If now another charged object carrying equal amount of positive charge is brought in contact with the clip, what will happen? Students and parents can download free a collection of all study material issued by various best schools in India.
Answer: The charged balloons have similar charges on the surfaces. Sometime, a crackling sound is heard while taking off sweater during winters. Lightning conductors can protect buildings from the effects of lightning. On touching the screen the charge discharges through our body. Key words :- Richter scale, electroscope, earthing, lightening conductors, Electric dischange Q. Question 18 Identify the lightning conductor and the copper plate in Fig. When an uncharged balloon is brought near a charged one, the uncharged balloon acquires some opposite charge.
Fortunately, these phenomena can be predicted to some extent. Ask the driver to drive slowly to a clear spot. Answer 18 A is the lightning conductor and B is the copper plate. Your performance in the exams depends greatly on your effort throughout the year. What time of the day is the best one to study? An electroscope may be used to detect whether a body is charged or not. It has gotten 10819 views and also has 4. Answers to Multiple Choice Questions 1.
These natural phenomena can cause large scale destruction of human life and property. There is accumulation of positive charges near the ground also. Thus, we get a slight shock. As a result there will be no charge on the aluminium strips and no repulsion will occur. Question 14 The aluminium strips in an electroscope as shown in fig. Seismograph can measure an earthquake of magnitude 3 on Richter Scale. Science Class 8 Important Questions are very helpful to score high marks in board exams.
Why are they constantly nagging us about these things? Answer 20 Electric charge gets accumulated on the screen. If a child gives any other reasonable precautions, it should be accepted Question 28 If the metal clip used in the electroscope is replaced by an ebonite rod and a charged body is brought in contact with it, will there be any effect on the aluminium strips? Question 21 Explain how does lightning conductor protects a building from getting struck by lightning. Answer 21 Lightning conductor does not allow the charge to accumulate on a building as it conducts the charge to the earth, protecting building from being struck by lightning. The reason is lightning has very high voltage and current. Since unlike charges attract each other, therefore a charged balloon attracts an uncharged one.
Answer 17 No, it will not occur. Even if you wish to have an overview of a chapter, quick revision notes are here to do if for you. As water vapours evaporate in the atmosphere, due to friction they are also charges. A natural phenomenon that cannot be predicted is an earthquake. It is of low intensity and will not cause any damage.
EduRev is like a wikipedia just for education and the Question Bank - Some Natural Phenomena images and diagram are even better than Byjus! When it falls on a tree, it can pass through the dead wood and electrocute us. Please refer to other links for free download of high quality study material. Move the balloon along the length of the tube and observe how the glow changes. When a glass rod is rubbed with a piece of silk cloth the rod a and the cloth both acquire positive charge. When charges move, they constitute an electric current. You can see some Question Bank - Some Natural Phenomena sample questions with examples at the bottom of this page.