NCERT Class VIII Science Solutions: Chapter 15-Some Natural Phenomena Part 5

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Question 26:

Explain why it is safer to use a wireless telephone instead of a landline telephone during lightning.

Answer:

Lightning is an electrical discharge. During lightning atmospheric electric charge may discharge through landline telephone wires and may become dangerous. Therefore it is safer to use a wireless telephone instead of a landline telephone during lightning

Question 27:

What precautions would you take if lightning occurs while you are outside the house?

Answer:

  1. Stay away from poles or other metallic objects.

  2. Stay away from tall trees.

  3. Stay away from open vehicles like motorbikes, tractors, construction machinery etc.

    Image of precaution of lightning

    Image of Precaution of Lightning

    Image of precaution of lightning

Question 28:

If the metal clip used in the electroscope is replaced by an ebonite rod and a charged body is brought in contact with it, will there be any effect on the aluminium strips? Explain.

Answer:

The aluminium strips will not show any repulsion. The charged body will not transfer any charge to the ebonite rod as ebonite rod is an insulator. As a result there will be no charge on the aluminium strips and no repulsion will occur.