Secondary School (English Medium) (5 to 8) इयत्ता ८ - CBSE Question Bank Solutions for Science

Identify the lightning conductor and the copper plate in the following figure.

If the materials used for constructing a building were good conductors, do you think lightning will strike the building. Will the lightning conductor be still required to be installed in the building?

You might have observed on a dry day that when you touch the screen of a television or computer monitor (with picture tube), you get a slight shock. Why does it happen?

Explain how does lightning conductor protects a building from getting struck by lightning.

Explain how lightning takes place.

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

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

What happens to light when it gets dispersed? Give an example.

Burning of wood and coal causes ______ of air.

Fire produced by oil cannot be controlled by ______.

Give reasons.

Water is not used to control fires involving electrical equipment.

Explain how CO₂ is able to control fires.

It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain

Which zone of a flame does a goldsmith use for melting gold and silver and why?

Discuss the effects of deforestation on the following.

Wild animals

Discuss the effects of deforestation on the following.

Environment

Discuss the effects of deforestation on the following.

Villages (Rural areas)

Discuss the effects of deforestation on the following.

Cities (Urban areas)

Discuss the effects of deforestation on the following.

Earth

Discuss the effects of deforestation on the following.

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