Class 8 Practice – Level 3 – Set 1 – Some Natural Phenomena

Total questions: 15

What is the primary mechanism that causes the separation of charges within a thunderstorm?

Collision of ice particles

Presence of magnetic fields

Evaporation of water

Change in air pressure

None

Which of the following statements about insulators and conductors is true?

Insulators have high mobility of electrons; conductors do not.

Conductors allow electric charge to flow freely, while insulators do not.

Both conductors and insulators can be charged easily.

Insulators have low resistivity; conductors have high resistivity.

None

When a charged rod is brought close to an electroscope, what change can be observed?

The leaves of the electroscope diverge

The leaves of the electroscope collapse

The electroscope becomes neutral

There is no change in the electroscope

None

What is the function of a lightning rod in protecting buildings?

It absorbs electrical energy from lightning

It prevents lightning from occurring

It directs the lightning's electrical energy safely into the ground

It creates a magnetic field around the building

None

Which of the following is the most widely used method for measuring the magnitude of an earthquake?

The Beaufort scale

The Moment Magnitude scale

The Richter scale

The Modified Mercalli Intensity scale

None

How do tectonic plate movements contribute to earthquakes?

They create new landforms

They lead to the accumulation of stress along faults

They decrease the Earth's temperature

They increase volcanic activity

None

What type of seismic wave is primarily responsible for causing most of the destruction during an earthquake?

P-waves

S-waves

Surface waves

Tsunami waves

None

What is a recommended action to take immediately after an earthquake has occurred?

Stay indoors until authorities say it’s safe

Go outside to assess damage

Use elevators to evacuate quickly

Gather near heavy furniture

None

Which atmospheric condition is most favorable for the formation of lightning?

High humidity and low temperatures

Low humidity and high temperatures

High humidity and strong updrafts

Low humidity and calm winds

None

10.

In electrostatic experiments, why is it essential to work in a dry environment?

To avoid interference from magnetic fields

To prevent static discharge due to moisture

To enhance the conductivity of materials

To reduce the risk of electrical shock

None

11.

Why is it important to ground an electroscope before using it to detect charges?

To ensure it can detect all types of charges.

To neutralize the electroscope before testing.

To increase its sensitivity to small charges.

To prevent electrical shocks to the user.

None

12.

During a lightning storm, what is the safest action to take if you are caught outside?

Find a high place to stay.

Crouch down in an open field.

Seek shelter in a nearby building.

Stay near trees for protection.

None

13.

What is the primary cause of tsunamis associated with earthquakes?

Underwater volcanic eruptions

Landslides in the ocean

Meteorite impacts

Sudden shifts in tectonic plates under the ocean floor

None

14.

Which human activity can lead to induced earthquakes?

Mining operations

Building construction

Agricultural practices

All of the above

None

15.

How do seismographs detect and record seismic waves?

By measuring changes in temperature

By recording sound waves produced by earthquakes

By using a pendulum that moves in response to ground motion

By analyzing ground vibrations with sensors

None

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Class 8 Practice – Level 3 – Set 1 – Some Natural Phenomena

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