{"id":3667,"date":"2023-01-04T06:53:39","date_gmt":"2023-01-04T06:53:39","guid":{"rendered":"https:\/\/theexampillar.com\/ncert\/?p=3667"},"modified":"2023-01-31T07:00:40","modified_gmt":"2023-01-31T07:00:40","slug":"ncert-solutions-class-8-science-chapter-15-some-natural-phenomena","status":"publish","type":"post","link":"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-science-chapter-15-some-natural-phenomena\/","title":{"rendered":"NCERT Solutions Class 8 Science Chapter 15 Some Natural Phenomena"},"content":{"rendered":"<h2 style=\"text-align: center;\"><span style=\"color: #000000; font-family: georgia, palatino, serif;\">NCERT Solutions Class 8 Science\u00a0<\/span><\/h2>\n<p style=\"text-align: justify;\"><span style=\"color: #000000; font-family: georgia, palatino, serif;\">The NCERT Solutions in English Language for Class 8 Science <strong>Chapter &#8211; 15 (Some Natural Phenomena) <\/strong>has been provided here to help the students in solving the questions from this exercise.<\/span><\/p>\n<h2 style=\"text-align: center;\"><span style=\"color: #000000; font-family: georgia, palatino, serif;\">Chapter &#8211; 15 (Some Natural Phenomena)<\/span><\/h2>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #000000;\">1. <\/span><span style=\"color: #000000;\">Which of the following cannot be changed easily by friction?<\/span><\/strong><br \/>\n<span style=\"color: #000000;\">(a) A plastic scale<\/span><br \/>\n<span style=\"color: #000000;\">(b) A copper rod<\/span><br \/>\n<span style=\"color: #000000;\">(c) An inflated balloon<\/span><br \/>\n<span style=\"color: #000000;\">(d) A woollen cloth<\/span><br \/>\n<strong><span style=\"color: #000000;\">Answer &#8211; <\/span><\/strong><span style=\"color: #000000;\">(b) A copper rod<\/span><\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #000000;\">2. <\/span><span style=\"color: #000000;\">When a glass rod is rubbed with a piece of silk cloth the rod<\/span><\/strong><br \/>\n<span style=\"color: #000000;\">(a) and the cloth both acquire a positive charge.<\/span><br \/>\n<span style=\"color: #000000;\">(b) becomes positively charged while the cloth has a negative charge.<\/span><br \/>\n<span style=\"color: #000000;\">(c) and the cloth both acquire a negative charge.<\/span><br \/>\n<span style=\"color: #000000;\">(d) becomes negatively charged while the cloth has a positive charge<\/span><br \/>\n<strong><span style=\"color: #000000;\">Answer &#8211; <\/span><\/strong><span style=\"color: #000000;\"><strong>(b)<\/strong> becomes positively charged while the cloth has a negative charge.<\/span><\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #000000;\">3. <\/span><span style=\"color: #000000;\">Write T against true and F against false in the following statements.<\/span><\/strong><br \/>\n<span style=\"color: #000000;\"><strong>(a)<\/strong> Like charges attract each other. (T\/F)<\/span><br \/>\n<span style=\"color: #000000;\"><strong>(b)<\/strong> A charged glass rod attracts a charged plastic straw. (T\/F)<\/span><br \/>\n<span style=\"color: #000000;\"><strong>(c)<\/strong> Lightning conductor cannot protect a building from lightning. (T\/F)<\/span><br \/>\n<span style=\"color: #000000;\"><strong>(d)<\/strong> Earthquakes can be predicted in advance. (T\/F)<\/span><\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #000000;\">Answer &#8211;<br \/>\n<\/span><\/strong><span style=\"color: #000000;\"><strong>(a)<\/strong> Like charges attract each other. <strong>(False)<\/strong><\/span><br \/>\n<span style=\"color: #000000;\"><strong>(b)<\/strong> A charged glass rod attracts a charged plastic straw. <strong>(True)<\/strong><\/span><br \/>\n<span style=\"color: #000000;\"><strong>(c)<\/strong> Lightning conductor cannot protect a building from lightning. <strong>(False)<\/strong><\/span><br \/>\n<span style=\"color: #000000;\"><strong>(d)<\/strong> Earthquakes can be predicted in advance. <strong>(False)<\/strong><\/span><\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #000000;\">4. <\/span><span style=\"color: #000000;\">Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain.<br \/>\n<\/span><span style=\"color: #000000;\">Answer &#8211; <\/span><\/strong><span style=\"color: #000000;\">When\u00a0a sweater is taken off, the woollen sweater gets charged because of the friction between the sweater and the body. Hence, one can hear a crackling sound during the given process.<\/span><\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #000000;\">5. <\/span><span style=\"color: #000000;\">Explain why a charged body loses its charge if we touch it with our hand.<\/span><\/strong><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211; <\/strong>Human body is a conductor of electricity. When a charged body is touched with hand, our body conducts its charges to the earth. Hence, by this way charged body loses its charge.<\/span><\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #000000;\">6. <\/span><span style=\"color: #000000;\">Name the scale on which the destructive energy of an earthquake is measured. An earthquake measures 3 on this scale. Would it be recorded by a seismograph? Is it likely to cause much damage?<\/span><\/strong><br \/>\n<strong><span style=\"color: #000000;\">Answer &#8211; <\/span><\/strong><span style=\"color: #000000;\">The destructive energy of an earthquake is measured on a scale called the Richter Scale.<\/span><br \/>\n<span style=\"color: #000000;\">Yes, it would be recorded by seismograph because this scale has the readings from 1 to 10. No it is not likely to cause much damage as earthquakes of magnitude higher than 5 is considered destructive in nature.<\/span><\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #000000;\">7. <\/span><span style=\"color: #000000;\">Suggest three measures to protect ourselves from lightning.<\/span><\/strong><br \/>\n<span style=\"color: #000000;\"><strong>Answer &#8211;\u00a0<\/strong><\/span>Protective measures against lightning\u00a0are as follows:<br \/>\n<strong>(i)\u00a0<\/strong><span style=\"color: #000000;\">Do not use TV or cable phone during lightning.<\/span><br \/>\n<span style=\"color: #000000;\"><strong>(ii)<\/strong> Stay indoor or under covered area.<\/span><br \/>\n<span style=\"color: #000000;\"><strong>(iii)<\/strong> Don\u2019t take bath during lightning.<\/span><\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #000000;\">8. <\/span><span style=\"color: #000000;\">Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?<\/span><\/strong><br \/>\n<strong><span style=\"color: #000000;\">Answer &#8211; <\/span><\/strong><span style=\"color: #000000;\">A charged balloon is repelled by another charged balloon because both carry same type of charges. On the other hand, an uncharged balloon is attracted by another charged balloon as they have opposite charges. We know that same charges repel and opposite charges attract each other.<\/span><\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #000000;\">9. <\/span><span style=\"color: #000000;\">Describe with the help of a diagram an instrument which can be used to detect a charged body.<\/span><\/strong><br \/>\n<strong><span style=\"color: #000000;\">Answer &#8211; <\/span><\/strong><span style=\"color: #000000;\">Electroscope is a device which is used to detect the charge on a body. It works on the principle that like charges repel each other while unlike charges attract each other. It consists of a metal rod with thin metal strip or leaf attached to it at the bottom.<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-3729\" src=\"https:\/\/theexampillar.com\/ncert\/wp-content\/uploads\/2022\/12\/NCERT-Solutions-Class-8-Science-Ch-15-Q9.jpg\" alt=\"NCERT Class 8 Solutions Science\" width=\"184\" height=\"238\" \/><br \/>\n<\/span><span style=\"color: #000000;\">At the top, the metal rod enters in a metallic cup or disc. The bottom of the rod and the metal leaf are enclosed in a glass box for protection. When the disc of the electroscope is touched with a charged ebonite or glass rod, the metal leaves open out or diverge. <\/span><span style=\"color: #000000;\">The extent of divergence depends upon the amount of charge on the electroscope. When the metal strips repel each other proves that the body is charged because repulsion is the sure test to detect that body is charged or not through an electroscope.<\/span><\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #000000;\">10. <\/span><span style=\"color: #000000;\">List three states in India where earthquakes are more likely to strike.<br \/>\n<\/span><span style=\"color: #000000;\">Answer &#8211; <\/span><\/strong><span style=\"color: #000000;\">The three states in India where earthquakes are more likely to strike are Jammu and Kashmir,\u00a0Gujrat, and Assam.<\/span><\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #000000;\">11. <\/span><span style=\"color: #000000;\">Suppose you are outside your home and an earthquake strikes. What precaution would you take to protect yourself?<br \/>\n<\/span><span style=\"color: #000000;\">Answer &#8211; <\/span><\/strong><span style=\"color: #000000;\">We will take the following precautions to protect ourselves:<\/span><br \/>\n<span style=\"color: #000000;\">(i) Move to open space. Find a clean spot away from buildings, trees and overhead power lines. Drop to the ground.<\/span><br \/>\n<span style=\"color: #000000;\">(ii) If we are in a car or a bus, will not come out. Drive slowly to a clear spot and remain in it till the earthquake stops.<\/span><\/p>\n<p style=\"text-align: justify;\"><strong><span style=\"color: #000000;\">12. <\/span><span style=\"color: #000000;\">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.<br \/>\n<\/span><span style=\"color: #000000;\">Answer &#8211; <\/span><\/strong><span style=\"color: #000000;\">No, it is not advisable to carry an umbrella at all. Its metallic objects are more prone to lightning stroke. So an umbrella increases the risk.<\/span><\/p>\n<p>&nbsp;<\/p>\n<table style=\"width: 100%; border-collapse: collapse;\" border=\"1\">\n<tbody>\n<tr style=\"height: 32px;\">\n<td style=\"width: 100%; background-color: #f2e079; text-align: center; height: 32px;\"><span style=\"color: #ff0000; font-size: 14pt;\"><strong>NCERT Class 8<sup>th\u00a0<\/sup>Solution\u00a0<\/strong><\/span><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\"><a class=\"row-title\" href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-english\/\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u201cNCERT Solutions Class 6 English\u201d (Edit)\">NCERT Solutions Class 8 English<\/a><\/span><\/strong><\/span><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\"><a class=\"row-title\" href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-hindi\/\" aria-label=\"\u201cNCERT Solutions Class 6 Maths\u201d (Edit)\">NCERT Solutions Class 8 Hindi<\/a><\/span><\/strong><\/span><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\"><a class=\"row-title\" href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-maths\/\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u201cNCERT Solutions Class 6 Maths\u201d (Edit)\">NCERT Solutions Class 8 Mathematics<\/a>\u00a0<\/span><\/strong><\/span><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><a href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-sanskrit-ruchira\/\" target=\"_blank\" rel=\"noopener\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\">NCERT Solutions Class 8 Sanskrit<\/span><\/strong><\/span><\/a><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\"><a class=\"row-title\" href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-science\/\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u201cNCERT Solutions Class 6 Social Science\u201d (Edit)\">NCERT Solutions Class 8 Science<\/a><\/span><\/strong><\/span><\/td>\n<\/tr>\n<tr style=\"height: 28px;\">\n<td style=\"width: 100%; text-align: left; height: 28px;\"><span style=\"font-size: 14pt;\"><strong><span style=\"font-family: georgia, palatino, serif; font-size: 12pt;\"><a class=\"row-title\" href=\"https:\/\/theexampillar.com\/ncert\/ncert-solutions-class-8-social-science\/\" target=\"_blank\" rel=\"noopener\" aria-label=\"\u201cNCERT Solutions Class 6 Social Science\u201d (Edit)\">NCERT Solutions Class 8 Social Science<\/a><\/span><\/strong><\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions Class 8 Science\u00a0 The NCERT Solutions in English Language for Class 8 Science Chapter &#8211; 15 (Some Natural Phenomena) has been provided here to help the students in solving the questions from this exercise. Chapter &#8211; 15 (Some Natural Phenomena) 1. Which of the following cannot be changed easily by friction? (a) A [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[535],"tags":[565,566,538,5],"class_list":["post-3667","post","type-post","status-publish","format-standard","hentry","category-class-8-science","tag-ncert-class-8-science-chapter-15-some-natural-phenomena-in-english","tag-ncert-solutions-class-8-science-chapter-15-in-english","tag-ncert-solutions-class-8-science-in-english","tag-ncert-solutions-in-english"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.9 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>NCERT Solutions Class 8 Science Chapter 15 Some Natural Phenomena | TheExamPillar NCERT<\/title>\n<meta name=\"description\" content=\"NCERT Solutions Class 8 Science\u00a0The NCERT Solutions in English Language for Class 8 Science Chapter - 15 (Some Natural Phenomena) has been provided here to help the students in solving the questions from this exercise. 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