CBSE Class 8 Science Chapter 12 Some Natural Phenomena Activity 1
Aim: To prove that an object gets electrically charged by rubbing.
Material Required: A ball pen refill, a small piece of paper, dry leaf, polythene, etc.
Read And Learn More CBSE Class 8 Science Activities
Procedure
- Firstly, take a ball pen refill and rub it vigorously with a piece of polythene.
- Now, bring it close to a piece of paper. Be ensure that the rubbed part of the refill should not be touched by our hand. We will find that the refill attracts the tiny pieces of paper.
- Repeat the activity with small pieces of dry leaf, husk, and mustard seeds and note down the observation. We will find that the refill attracts the tiny pieces in each case.
” Cbse Class 8 Science Chapter 12 Activities “
Conclusion: We can conclude that when the plastic refill is rubbed with polythene, dry leaf, or mustard seeds, etc., it acquires a small electric charge.
” Static Electricity Experiments Class 8 “
CBSE Class 8 Science Chapter 12 Some Natural Phenomena Activity 2
Aim: To record that different objects get electrically charged when rubbed with different materials.
Material Required: Refill, balloon, eraser, steel spoon, polythene, dry hair, silk cloth.
Procedure:
- Collect the objects given in the table and rub them against the materials listed next to them in the table.
- Bring the charged object (rubbed object) close to tiny pieces of paper and observe, it attracts or not.
- Record your observations in the table.
” Charging By Rubbing Class 8 “
Conclusion: We have concluded from the observation table that the objects rubbed with different materials get charged and attract tiny pieces of paper, except the steel spoon, because it is a good conductor.
CBSE Class 8 Science Chapter 12 Some Natural Phenomena Activity 3
Aim: To understand the interaction between two types of electric charges.
Material Required: Two inflated balloons, two refills, woollen cloth, polythene.
Procedure:
- Firstly, hang two inflated balloons in such a way that they do not touch each other.
- Now, rub both the balloons with a woollen cloth and release them.
- We will observe that both balloons start repelling each other. They both acquire the same negative charge.
” Some Natural Phenomena Class 8 “
- Now, bring a plastic refill and rub it with polythene. It with acquire some charge.
- Place this charged plastic refill in a glass tumbler using the tumbler as a stand.
- Now, take another plastic refill and rub it with polythene and bring it close to the charged refill, which is already placed in a glass tumbler.
” Electroscope Working Principle “
We will find that. The charged refill in the tumbler moves away. It means both the refills repel each other, as they acquire the same charges, that is positive charge.
- Again, rub a refill with polythene and place it gently in a glass tumbler as before.
- Now, bring an inflated charged balloon near the refill.
We will observe that the charged refill moves towards the charged balloon. As they both acquire different charges.
Conclusion: We have concluded from the activity that like charges repel each other and unlike charges attract each other.
” Earthquake Effects And Causes “
CBSE Class 8 Science Chapter 12 Some Natural Phenomena Activity 4
Aim: To understand the working ofan electroscope. Material Required: An empty jam bottle, a cardboard, a metal paper clip, two small pieces of aluminum foil, and a refill.
Procedure:
- Choose an empty jam bottle and take a piece of cardboard slightly bigger in size than the mouth of the bottle.
- Now, pierce a hole in the cardboard so that a metal paper clip can be inserted.
- Cut two strips of aluminum foil about 4cm x 1 cm each. Hang them on the paper clip as shown in the figure.
- Now, fix the paper clip in the cardboard lid, so that it gets perpendicular to it as shown in the figure.
- Now, charge a refill and touch it with the end of the paper clip. We can see that the two aluminium foils move away from each other.
- Gently, touch the other charged bodies with the ends of a paper clip. Here, we find no differences in the working of foil strips.
” Earthquake Damage Report “
Conclusion: We have concluded that a charged body transfers all its charges to aluminium foil through a paper clip
Which causes the aluminium leaves to diverge. Therefore, the greater the amount of electric charge on a body, the greater the aluminium leaves will diverge.
” Tsunami Devastation In India “
CBSE Class 8 Science Chapter 12 Some Natural Phenomena Activity 5
Aim: To prepare a short report on the suffering of the people during and after the earthquakes.
Material Required: Newspapers, magazines.
” Ball Pen Refill And Static Charge “
Procedure:
- Collect some newspapers and magazines from different publishers.
- Read the articles carefully based on the earthquakes.
- Now, collect some pictures showing the damage caused by these earthquakes from these newspapers and magazines.
- Make a short report on the destruction caused by earthquakes.
” Rubbing Objects With Polythene “
Conclusion: An Earthquake is a natural calamity. It is a sudden shaking or trembling of the earth which lasts for a short time. Some of the damaging effects ofan earthquake are as follows
- The earthquake may cause landslides and tsunamis in hilly and coastal areas.
- An earthquake may break a groundwater pipe, which disrupts the water supply system.
- An earthquake brings destruction to buildings, dams, railway tracks, roads, etc.
- The earthquake may cut off the communication system, and the affected areas may get disconnected from the rest of the world.
CBSE Class 8 Science Chapter 12 Some Natural Phenomena Activity 6
Aim: To make a report of some devastation caused by the tsunami in India.
Material Required: A political world map.
Procedure:
- Firstly, take a world map.
- Now, locate the eastern coast and the Andaman and Nicobar islands in India. Mark other countries around the Indian Ocean that could have suffered damage from the tsunami.
- Now, collect some information from your parents or other elders to make a report of the devastation caused by the tsunami in India.
- Prepare a report in neat and clean handwriting.
Conclusion: We have located the eastern coast of India, the Andaman and Nicobar Islands, and other countries around the Indian Ocean.
” Balloon And Static Electricity “
” Aluminum Foil In Electroscope “
Some information about the devastation caused by the tsunami in India is given above.
A major tsunami occurred in the Indian Ocean on 26th December 2004. At 8:38 AM, an earthquake of 6.1 magnitudes was felt in Andaman Island. At 9:00 AM, this affected India’s South-Eastern coast.
Thousands of people died, and many people lost their families. The coastal area was destroyed. Many fisherman and their community were ruined by the tsunami. It was one of the most devastating natural calamities, people have ever witnessed.