NCERT Class VIII Science Solutions: Chapter 15-Some Natural Phenomena Part 3 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 13:

If a charged plastic straw is brought near another uncharged plastic straw, what will happen?


The two will attract each other

Question 14:

The aluminium strips in an electroscope as shown in fig are replaced by plastic strips and a charged body is brought in contact with the metal clip. What will happen?

As Showing in Fig is a Aluminium Strips in an Electroscope


No divergence of strips will take place.

Question 15:

Plastic straws A and B are rubbed with dry cotton cloth. What will happen if they are brought near each other?


They will repel each other.


Question 16:

During the construction of a building the lightning conductor was left hanging in the air by mistake. Would the lightning conductor be still effective? Explain.


No, it will not be effective. Since lightning conductor was not connected properly to the earth, therefore, the charge will not pass through to the earth.

Question 17:

If air and cloud were good conductors of electricity, do you think lightning could occur? Explain.


No, it will not occur. The charge separation cannot take place in conductors. Therefore charges will not accumulate on clouds and so lightning cannot take place.

Question 18:

Identify the lightning conductor and the copper plate in

As Showing in Fig is a Find the Lightning Conductor and Copp …


A is the lightning conductor and B is the copper plate.

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