So now you don't have to worry about whether or not you will be able to solve all the questions. Lightning conductors can protect buildings from the effects of lightning. If now another charged object carrying equal amount of prositive charge is brought in contact with the clip, what will happen? A natural phenomenon that cannot be predicted is an earthquake. Revision notes in exam days is one of the best tips recommended by teachers during exam days. Question 18 Identify the lightning conductor and the copper plate in Fig. While taking off sweater, an electric discharge occurs between sweater and the body which results in forming of sparks and crackling sound. The reason is lightning has very high voltage and current.
Answer 14 No divergence of strips will take place. There surely must be a reason behind it. Stay away from tall and heavy objects that may fall on you. The process of transfer of charge from a charged object to the earth is called earthing. What will happen to the strips? Choose the most appropriate statement from the following options: a they may attract b they may repel c they may attract or repel depending on the type of charges they carry d there will be no effect Answer 4 c Question 5 Which of the following is not likely to cause Tsunami? 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? These natural phenomena can cause large scale destruction of human life and property.
Class 8 Question Bank - Some Natural Phenomena Summary and Exercise are very important for perfect preparation. What will happen if they are brought near each other? If you are outdoors: Find a clear spot, away from buildings, trees and overhead power lines. Protective measures are of utmost importance during lightning strikes. Users can download and print the worksheets on class 8 Science Some Natural Phenomena for free. As the amount of charge increases, the negative charges on the cloud tend to make a path towards the ground, and it results in a narrow streak of electrical discharge, which we call lightning. Protective measures for earthquake: 1. Do not come out till the tremors stop.
Will the lightning conductor be still required to be installed in the building? L-15 Some Natural Phenomena Q. Would the lightning conductor be still effective? It has gotten 10819 views and also has 4. This region is called the epicenter of the earthquake. What time of the day is the best one to study? Air is also a poor conductor of electricity, still lightning passes through it and strikes on tall trees and buildings. Take a paper strip roughly 10 cm × 3 cm. When charges move, they constitute an electric current.
It is a logarithmic scale, ranging from 1 to 10 for indicating the intensity of an earthquake. These are the Some Natural Phenomena class 8 Notes prepared by team of expert teachers. There is accumulation of positive charges near the ground also. You might have seen videos showing trees catching fire due to lightning. Would the lightning conductor be still effective? Key words :- Richter scale, electroscope, earthing, lightening conductors, Electric dischange Q.
The students should practice the questions database to get better marks in examination. Download revision notes for Some Natural Phenomena class 8 Notes and score high in exams. Taking shelter in interiors house or other closed places and vehicles closed e. He was not just an educationist but also a humanist who greatly inspired all those who were in touch with him. If a child gives any other reasonable precautions, it should be accepted Question 26 Explain why it is safer to use a wireless telephone instead of a landline telephone during lightning.
Thus, we get a slight shock. Explain Answer: In general, Sweater is made of wool and the other inner clothes like shirts are made up of cotton and synthetic fibres. Answer 12 No Question 13 If a charged plastic straw is brought near another uncharged plastic straw, what will happen? 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. The charge separation cannot take place in conductors. Name the scale on which the destructive energy of an earthquake is measured. An earthquake measures 3 on this scale. Question 22 In an electroscope if a negatively charged body is brought in contact with the metal clip, the strips of the electroscope diverge.
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. Hard work is the key to success and since you surely would have. The process of electric discharge between clouds and the earth or between different clouds causes lightning. Question 27 What precautions would you take if lightning occurs while you are outside the house? Give it a shape as shown in Fig. Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon? You can see some Question Bank - Some Natural Phenomena sample questions with examples at the bottom of this page. Explain why a charged body loses its charge if we touch it with our hand.
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. Question 17 If air and cloud were good conductors of electricity, do you think lightning could occur? Is it likely to cause much damage? As a result there will be no charge on the aluminium strips and no repulsion will occur. Students and parents can download free a collection of all study material issued by various best schools in India. Now the clip is touched gently by our hand. You might have lost count I'm sure. Bring a charged body near it.
But have you ever thought why it is so? You also get idea about the type of questions and method to answer in your Class 8th examination. Adjust the flow so that it forms a thin stream. Write a short report on the activity. Why are they constantly nagging us about these things? The study material has been carefully compiled by the best teachers in India. Due to friction among these, static charge gets accumulated on the sweater. Answer: b A copper rod.