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NCERT Solutions for Class 8 Science Chapter 12 Some Natural Phenomena will assist you in scoring more marks. This includes the textbook and their solutions for Some Natural Phenomena Chapter 12 of Class 8 Science, which is made in adherence to the updated syllabus 2023 released by CBSE.
Our solutions offer ample material to help students build a strong foundation and improve their understanding of the subject.
On this page, you will find all the NCERT Solutions for Class 8 Science Chapter 12 Some Natural Phenomena which includes detailed exercise-based solutions. These NCERT Solutions for Class 8 Science are downloadable and easy to access. Our Science experts have meticulously developed these NCERT Solutions for Class 8 to support students in preparing for their Class 8 exams.
NCERT Solutions for Class 8 Science Chapter 12 Some Natural Phenomena
Some Natural Phenomena Class 8 Science NCERT Textbook Questions
Exercise Questions
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.
Solution: (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.
Solution: (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)
Solution:
(a) False
(b) True
(c) False
(d) False
4. Sometimes, a crackling sound is heard while taking off a sweater during winters. Explain.
Solution:
When two objects are rubbed together ( friction) , they develop opposite electrical charges and static charges gets accumulated on the sweater. Therefore due to formation of these charges a crackling sound is heard while taking off a sweater during winters.
5. Explain why a charged body loses its charge if we touch it with our hand.
Solution:
Our body is a good conductor of electricity. When we touch a charged body, it loses its charge, because charge gets tranferred from our body to earth and this process of tranfer of charge from our body to earth is known as earthing.
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?
Solution:
The scale used to measure earthquake is Richter Scale. Yes, it would be recorded by a seismograph. The earthquake with magnitude of 3 on Richter Scale is not likely to cause much damage because of its low intensity.
7. Suggest three measures to protect ourselves from lightning.
Solution:
Measures to protect ourselves from lightning are-
(i) Staying inside a room or in a covered area.
(ii) If no proper shelter is available, then we should never stand under a tree or electric pole.
(iii) We should not touch or use TV, Mobile phones or any metal wire or appliances.
8. Explain why a charged balloon is repelled by another charged balloon whereas an uncharged balloon is attracted by another charged balloon?
Solution:
We know that same charges repel and opposite charges attract each other. 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.
9. Describe with the help of a diagram an instrument which can be used to detect a charged body.
Solution:
It comprises a metal rod with two aluminum foil leaves attached to one end and a metal disc at the opposite end. These leaves are positioned within a conical flask and sealed with a cork to isolate them from the surrounding atmosphere. When a charged object comes into contact with the metal disc, the aluminum leaves move apart because some of the charges are transferred to the aluminum leaves through the metal rod. This process is known as charging by conduction. The charges on the leaves and the charged object have the same nature, causing the aluminum leaves to repel each other. If the object is uncharged, they would instead attract each other.
10. List three states in India where earthquakes are more likely to strike.
Solution: Gujarat, Rajasthan and Himachal Pradesh.
11. Suppose you are outside your home and an earthquake strikes. What precaution would you take to protect yourself?
Solution:
Precautions that we can take during an earthquake when we are outside –
(i) Moving to an open place, away from buildings, trees and over head power lines.
(ii) If we are in a car or a bus, we should not come out. We need to drive slowly to a clear spot and remain in it till the earthquake stops.
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.
Solution:
No, we should not carry an umbrella with if there is a prediction about a thunderstorm. The reason is, an umbrella has a metallic rod, which serves as a good conductor for lightning to reach human body thereby causing him an electric shock. Hence, we should not carry an umbrella during lightning.
Summary
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