{"id":26009,"date":"2021-06-24T19:12:36","date_gmt":"2021-06-24T13:42:36","guid":{"rendered":"https:\/\/ncertsolutions.guru\/?p=26009"},"modified":"2021-06-24T19:12:36","modified_gmt":"2021-06-24T13:42:36","slug":"ncert-solutions-for-class-8-science-chapter-15","status":"publish","type":"post","link":"https:\/\/ncertsolutions.guru\/ncert-solutions-for-class-8-science-chapter-15\/","title":{"rendered":"NCERT Solutions for Class 8 Science Chapter 15 Some Natural Phenomena"},"content":{"rendered":"

These NCERT Solutions for Class 8 Science<\/a> Chapter 15 Some Natural Phenomena Questions and Answers are prepared by our highly skilled subject experts to help students while preparing for their exams.<\/p>\n

Some Natural Phenomena NCERT Solutions for Class 8 Science Chapter 15<\/h2>\n

Class 8 Science Chapter 15 Some Natural Phenomena Textbook Exercise Questions and Answers<\/h3>\n

Page-197<\/span><\/p>\n

Select the correct option in Questions 1 and 2.<\/span><\/p>\n

Question 1.
\nWhich of the following cannot be charged easily by friction?
\na. A plastic scale
\nb. A copper rod
\nc. An inflated balloon
\nd. A woollen cloth
\nAnswer:
\nb. A copper rod<\/p>\n

Question 2.
\nWhen a glass rod is rubbed with a piece of silk cloth the rod
\na. and the cloth both acquire positive charge
\nb. becomes positively charged while the cloth has a negative charge
\nc. and the cloth both acquire negative charge
\nd. becomes negatively charged while the cloth has a positive charge
\nAnswer:
\nb. becomes positively charged while the cloth has a negative charge<\/p>\n

Question 3.
\nWrite T against true and F against false in the following statements:
\na. Like charges attract each other. (T\/F)
\nb. A charged glass rod attracts a charged plastic straw. (T\/F)
\nc. Lightning conductor cannot protect a building from lightning. (T\/F)
\nd. Earthquakes can be predicted in advance. (T\/F)
\nAnswer:
\na. F,
\nb. T,
\nc. F,
\nd. F<\/p>\n

Question 4.
\nSometimes, a crackling sound is heard while taking off a sweater during winters. Explain.
\nAnswer:
\nWhen we take off a sweater, it rubs against our shirt. The rubbing together of sweater and shirt produces opposite electric charges on them. The discharge of these electric charges produces tiny sparks of light as well as crackling sound.<\/p>\n

\"NCERT<\/p>\n

Question 5.
\nExplain why a charged body loses its charge if we touch it with our hand.
\nAnswer:
\nHuman body is a conductor of electricity. So, when we touch a charged object, our body conducts its charges to the earth. That is why a charged body loses its charge, if we touch it with our hand. This phenomenon is known as electric discharge.<\/p>\n

Question 6.
\nName 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?
\nAnswer:
\nThe destructive energy of an earthquake is measured by the Richter scale. The reading of magnitude 3 on the Richter scale would be recorded by a seismograph. If the Richter scale gives a reading of magnitude 3, the earthquake is not likely to cause much damage. Generally, earthquakes having magnitudes higher than 7 are destructive in nature.<\/p>\n

Question 7.
\nSuggest three measures to protect ourselves from lightning.
\nAnswer:
\nProtective measures against lightning are as follows:<\/p>\n