Grade 8 CBSE Some Natural Phenomena

The boundaries of the earth's plate are known as

• Fault Zone

• Inner Core

• Mantle

• Seismic Zone

The magnitude of an earthquake is measured in

• Kelvin scale

• Richter scale

• Celsius scale

• Decibel scale

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

• Repel each other

• No change

• Create a magnetic field

• Attract each other

Which of the following is not likely to cause tsunami?

• Nuclear explosion under sea

• Earthquake

• Lightning

• Volcanic eruption

The epicenter of an earthquake is located

• On the surface of the earth

• In the mantle of the earth

• Deeper under the crust of the earth

• In the core of the earth

The process of transferring charge from a charged object to the earth is called earthing.

• Partially true

• Not mentioned

• False

• True

A device used to protect tall buildings from lightning is called metal detector.

• Not mentioned

• Partially true

• False

• True

The waves are recorded by Richter scale.

• True

• Not mentioned

• False

• Partially true

Maximum damage occurs at epicentre.

• True

• False

• Partially true

• Not mentioned

An earthquake lasts for a long time.

• Not mentioned

• True

• False

• Partially true