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NCERT Solutions for class 8 science Chapter 15 Some Natural Phenomena

class 8th science Chapter 15

NCERT Solutions Science for Class 8 Chapter 15 Some Natural Phenomena

class eight science Chapter 15 question answer

Select the correct option in Questions 1 and 2.
1. Which of the following cannot be charged easily by friction?
(a) A plastic scale
(b) A copper rod
(c) An inflated balloon
(d) A woollen cloth.
Answer :- (b) A copper rod

2. When a glass rod is rubbed with a piece of silk cloth the rod
(a) and the cloth both acquire positive charge.
(b) becomes positively charged while the cloth has a negative charge.
(c) and the cloth both acquire negative charge.
(d) becomes negatively charged while the cloth has a positive charge.
Answer :- (b) becomes positively charged while the cloth has a negative charge.

3. Write T against true and F against false in the following statements.
(a) Like charges attract each other (T/F)
(b) A charged glass rod attract a charged plastic straw (T/F)
(c) Lightning conductor cannot protect a building from lightning (T/F)
(d) Earthquakes can be predicted in advance (T/F)
Answer :-
3. Write T against true and F against false in the following statements.
(a) Like charges attract each other (F)
(b) A charged glass rod attract a charged plastic straw (T)
(c) Lightning conductor cannot protect a building from lightning (F)
(d) Earthquakes can be predicted in advance (F)

4. Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain.
Answer :- While taking off a sweater in winter, a crackling sound is heard because the surface of the sweater gets charged due to friction with the body. These charges attract each other, causing a crackling sound.

5. Explain why a charged body loses its charge if we touch it with our hand.
Answer :- When we touch a charged object with our hands, it loses its charge, because our body is a good conductor of electricity. On touching this electrical charge passes through the body to the earth and the object becomes uncharged.

6. 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?
Answer :- The scale used to measure earthquakes is reactor scale or seismography. Seismography can record earthquakes of magnitude 1 to 3. An earthquake involving more than 3 reactors is harmful. An earthquake of more than 5 reactors is harmful to humans and property.

7. Suggest three measures to protect ourselves from lightning.
Answer :- Following are the three measures to protect against lightning:
(i) Do not take out if you are in a car or bus.
(ii) Stay away from any kind of electrical equipment as much as possible, because lightning is also a form of electricity.
(iii) Do not bathe in running water, otherwise you may get electrocuted.

8. Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?
Answer :- A charged balloon repels another charged balloon, because like charges repel each other, while an uncharged balloon attracts a charged balloon, because unlike charges are attracted.

9. Describe with the help of a diagram an instrument which can be used to detect a charged body.
Answer :-

10. List three states in India where earthquakes are more likely to strike.
Answer :- The three states with most earthquakes are –
(i) Jammu and Kashmir
(ii) Gujarat (Kutchh)
(iii) Rajasthan

11. Suppose you are outside your home and an earthquake strikes. What precaution would you take to protect yourself?
Answer :- Following are some measures to avoid earthquake outside the house
(i) Stay away from buildings and trees.
(ii) Find open space and lie down on the ground.
(iii) Do not get out if the car is inside the bus.

12. 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.
Answer :- Carrying an umbrella when going out of the house on a day when there is a possibility of lightning can be dangerous, because the umbrella has a metal rod which attracts lightning. It can deliver lightning to us which can be harmful.