The study material has been carefully compiled by the best teachers in India. The students should practice the questions database to get better marks in examination. Answer: The charged balloons have similar charges on the surfaces. A natural phenomenon that cannot be predicted is an earthquake. Name the scale on which the destructive energy of an earthquake is measured.
Since like charges repel each other, that's why the charged balloon is repelled by another charged balloon. Write a short report on the activity. Science Class 8 Important Questions are very helpful to score high marks in board exams. He was an eminent personality when it comes to subjects of Commerce and Management. Therefore charges will not accumulate on clouds and so lightning cannot take place. 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? Suggest three measures to protect ourselves from lightning. Write a brief report, explaining its working.
Would the lightning conductor be still effective? The mantle consists of semi-solid material above which the crust floats. Answer 16 No, it will not be effective. He had certain values, principles and the way of life he followed serves as a guiding light for many of us today. Thus, we get a slight shock. Answer 24 During the development of a thunderstorm, the air currents move upwards while the water droplets move downwards.
The formation of clouds involves friction between water droplets in the atmosphere. Why are they constantly nagging us about these things? 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. 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. Will the lightning conductor be still required to be installed in the building? Your performance in the exams depends greatly on your effort throughout the year. Question 18 Identify the lightning conductor and the copper plate in Fig.
If now another charged object carrying equal amount of positive charge is brought in contact with the clip, what will happen? The process of transfer of charge from a charged object to the earth is called earthing. Question 15 Plastic straws A and B are rubbed with dry cotton cloth. The energy released at the focus of an earthquake, propagates outwardly in form of waves known as seismic waves. If you are at home: Take shelter under a table and stay there till shaking stops. Take a paper strip roughly 10 cm × 3 cm. When a glass rod is rubbed with a piece of silk cloth the rod a and the cloth both acquire positive charge. There are two kinds of charges — positive charge and negative charge Like charges repel and unlike charges attract each other.
Answer 26 Lightning is an electrical discharge. Question 25 Mention three precautions that you will take to protect yourself if earthquake strikes when you are inside the house. Bring it near the water stream. These natural phenomena can cause large scale destruction of human life and property. Air is also a poor conductor of electricity, still lightning passes through it and strikes on tall trees and buildings.
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. What time of the day is the best one to study? A charged body loses its charge when we touch it with hand because the charges get transferred from our body to earth. Which of the following cannot be charged easily by friction? During lightning atmospheric electric charge may discharge through landline telephone wires and may become dangerous. So now you don't have to worry about whether or not you will be able to solve all the questions. It is of low intensity and will not cause any damage.
Explain Answer: In general, Sweater is made of wool and the other inner clothes like shirts are made up of cotton and synthetic fibres. 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? The earthquake measuring 7 or more on Richter scale can cause severe damage to life and property. Answer: Human body is conductor of electricity. Protective measures for earthquake: 1. As a result there will be no charge on the aluminium strips and no repulsion will occur. What will happen to the strips? The positive charges collect near the upper edges of the clouds and the negative charges accumulate near the lower edges.
How many times have they told us about fixing a timetable and setting a routine to complete all our studies on time? Protect your head with a pillow. Do not come out till the tremors stop. 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. EduRev is like a wikipedia just for education and the Question Bank - Some Natural Phenomena images and diagram are even better than Byjus! Due to friction among these, static charge gets accumulated on the sweater. He was not just an educationist but also a humanist who greatly inspired all those who were in touch with him. As a result negative and positive charges meet producing a streak of bright light and sound, called lightning.