Activity 4.2 Class 8 Science Chapter 4
In this post, you will find NCERT
Science Class 8 Chapter 4 Materials: Metals and Non-metals Activity solutions. Class 8 science chapter 4
consists of NCERT Activity 4.2
Class 8 Science Explanation with a conclusion.
NCERT Activity 4.2 Class 8 Science Explanation with a conclusion
You are suggested to study NCERT activity 4.2 class 8 science explanation
with a conclusion so that you can attempt questions based on activity 4.2
class 8 science.
Activity 4.2 Class 8 Science
· Recall how to make an electric circuit to test whether electricity can pass through an object or not.
· You might have performed the activity with various objects in class VI.
· Now, repeat the activity with the materials mentioned in the table.
· Observe and group these materials into good conductors and poor conductors
|
S. No. |
Materials |
Good conductor/poor conductor |
|
1 |
Iron rod/nail |
|
|
2 |
Sulphur |
|
|
3 |
Coal piece |
|
|
4 |
Copper wire |
|
Procedure of Activity 4.2 Class 8 Science
· First of all connect a battery to a torch bulb with connected wires.
· Leave the ends A and B wire free.
· Now place the given material one by one between ends A and B to complete the circuit.
· Check if the bulb glows or not.
 |
| Electric circuit |
Observation of Activity 4.2 Class 8 Science
|
S. No. |
Materials |
Good conductor/poor conductor |
|
1 |
Iron rod/nail |
Good conductor |
|
2 |
Sulphur |
Poor conductor |
|
3 |
Coal piece |
Poor conductor |
|
4 |
Copper wire |
Good conductor |
Explanation of Activity 4.2 Class 8 Science
Metals have free electrons which conduct electricity
from one end to the other.
Nonmetals don’t have any free electrons so they do
not conduct electricity.
Exception: Graphite (In graphite,
each carbon has one free electron so graphite electrons)
Conclusion of
Activity 4.2 Class 8 Science
This activity shows that metals are good conductors of
electricity and non-metals are poor conductors.
Related Topics
1. Activity 4.1 Class 8 Science
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