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All questions of Some Natural Phenomena for Class 8 Exam

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We cannot predict cyclones.
  • a)
    True
  • b)
    False
Correct answer is option 'B'. Can you explain this answer?

Rohit Sharma answered
Scientists use a measure called Potential intensity to help them forecast the strength of trophical cyclones, aka hurricanes or typhoons.
Potential intensity, a theoretical framework of large - scale ocean - atmosphere processes, helps scientists forecast the power of a cyclone.

Static electricity charges can be produced by
  • a)
    Heating
  • b)
    Rubbing
  • c)
    Beating
  • d)
    none of these
Correct answer is option 'B'. Can you explain this answer?

Ananya Das answered
Static charge is charge that is not in motion. Charge stored in battery or cell and rubbing two substances create static charge.

The outermost layer of earth is called
  • a)
    crust
  • b)
    Mountain
  • c)
    Core
  • d)
    Mantle
Correct answer is option 'A'. Can you explain this answer?

Anu Choudhury answered
The outermost layer of earth is called crust. The middle layer is called mantle and innermost layer is called core.

Lightning strike destroys life and property.
  • a)
    True
  • b)
    False
Correct answer is option 'A'. Can you explain this answer?

Sahil Unni answered
Lightning strike is a natural phenomenon that occurs when there is a discharge of electricity within a thunderstorm. It is a powerful force of nature that can have devastating effects on life and property. Hence, the statement that "lightning strike destroys life and property" is true.

Reasons for Lightning Strike Effects:

1. Intense Heat and Fire:
- When lightning strikes an object, it releases an enormous amount of heat, which can lead to fires.
- This heat can cause buildings, forests, and other structures to catch fire, resulting in the destruction of property and vegetation.
- Fires caused by lightning strikes can spread rapidly and cause further damage if not extinguished promptly.

2. Structural Damage:
- The sheer power of a lightning strike can cause significant structural damage to buildings, infrastructure, and other man-made objects.
- The intense electrical charge can melt or vaporize materials, leading to the collapse or destruction of structures.
- Lightning strikes can damage roofs, electrical systems, and other components, posing a risk to human life and property.

3. Electrical Surges:
- A lightning strike can induce powerful electrical surges that travel through power lines and electrical systems.
- These surges can damage electrical equipment, appliances, and electronic devices, leading to their malfunction or destruction.
- Electrical surges caused by lightning strikes can also create fire hazards and pose a risk of electrocution.

4. Injury and Loss of Life:
- Lightning strikes can cause severe injuries or even death to humans and animals.
- The high voltage and current associated with lightning can result in burns, cardiac arrest, and neurological damage.
- People struck by lightning may also experience long-term health issues such as memory loss, sleep disorders, and chronic pain.

Precautions to Minimize Lightning Strike Effects:

- To minimize the risks associated with lightning strikes, it is important to take safety precautions such as:
1. Seeking shelter in a sturdy building or a fully enclosed metal vehicle during a thunderstorm.
2. Avoiding open areas, tall objects, and bodies of water during a lightning storm.
3. Unplugging electronic devices and avoiding the use of landline telephones during thunderstorms.
4. Installing lightning protection systems, such as lightning rods, on structures to redirect the electrical charge safely into the ground.

In conclusion, lightning strikes can indeed cause significant destruction to life and property. It is crucial to understand the potential dangers associated with lightning and take appropriate safety measures to minimize the risks and protect ourselves and our belongings.

The charge acquired by a glass rod when it is rubbed with a silk is
  • a)
    negative
  • b)
    positive
  • c)
    both
  • d)
    none.
Correct answer is option 'B'. Can you explain this answer?

Shubham Sharma answered
When you are rubbing the glass rod with the silk cloth, electrons are stripped away from the atoms in the glass and transferred to the silk cloth. This leaves the glass rod with more positive than negative charge, so you get a net positive charge.

The outermost layer of earth is in one piece.
  • a)
    True
  • b)
    False
Correct answer is option 'B'. Can you explain this answer?

Tanishq Patel answered
The crust is the outermost layer of the planet, the cooled and hardened part of the Earth that ranges in depth from approximately 5-70 km (~3-44 miles). This layer makes up only 1% of the entire volume of the Earth, though it makes up the entire surface (the continents and the ocean floor).

Which of the following countries in the world is most prone to earthquakes?
  • a)
    India
  • b)
    America
  • c)
    China
  • d)
    Japan
Correct answer is option 'D'. Can you explain this answer?

Prerna Chavan answered
Japan is most prone to earthquakes. People of Japan construct their buildings in such a way that these can withstand major tremors.

The process of transferring charge from a charged object to the earth is called _____.
  • a)
    lightning
  • b)
    charging
  • c)
    earthing
  • d)
    discharging
Correct answer is option 'C'. Can you explain this answer?

Rishika Menon answered
The Process of Earthing
Earthing, also known as grounding, is a critical process in electrical systems and physics that involves transferring charge from a charged object to the earth. This process is essential for safety and stability in various applications.
Understanding Earthing
- Definition: Earthing is the process of connecting an electrically conductive object to the ground, allowing excess charge to flow into the Earth.
- Purpose: The main goal is to prevent the build-up of static electricity and protect electrical circuits from overvoltage by providing a safe path for excess charge.
How Earthing Works
- Charge Transfer: When a charged object comes into contact with the ground, electrons move between the object and the Earth until both reach the same electric potential.
- Safety Mechanism: Earthing protects people and equipment from electrical faults. In the event of a fault, the excess current is directed safely into the Earth, reducing the risk of electric shock or fire.
Applications of Earthing
- Electrical Systems: In homes and industries, earthing is crucial for electrical safety, ensuring that any leakage currents are safely dissipated.
- Lightning Protection: Buildings often have earthing systems to protect against lightning strikes, directing the high voltage safely into the ground.
Conclusion
In summary, the process of transferring charge from a charged object to the Earth is termed earthing. It plays an essential role in maintaining safety and stability in electrical systems, making it a fundamental concept in electrical engineering and physics.

Can you explain the answer of this question below:

Lightening is _________ on huge scale.

  • A:

    Magnetic effect

  • B:

    Electric spark

  • C:

    Electro-magnetic effect

  • D:

    Heating effect

The answer is B.

Sanjana Bose answered
Lightning: Lightning is an electric spark, but on a huge scale. Lightning is caused by the accumulation of charges in the cloy s.

Suppose you are in a car and there is a thunderstorm. Which of the following is the best way to protect yourself from possible harm?
  • a)
    Remaining in the car
  • b)
    Getting out of the car and taking cover under the car
  • c)
    Running to a nearby tree
  • d)
    Getting out and standing under an electric pole
Correct answer is option 'A'. Can you explain this answer?

Nidhi Ahuja answered
During thunderstorm and lightning, no open place is safe. If you are travelling by car, you are safe inside with the windows and doors of the vehicle closed. The rubber tyres of the cars are non- conductors, so you will be safer inside the car. All other options (tree, pole) have greater chances of electrocution. (B) house or a building is a safe place too.)

Which of the following state India is not likely to be affected by earthquake?
  • a)
    Rajasthan
  • b)
    Uttar Pradesh
  • c)
    Jammu Kashmir
  • d)
    Gujarat
Correct answer is option 'B'. Can you explain this answer?

Ananya Das answered
Jammu Kashmir, Gujarat and Rajasthan are Indian state falling in seismic zone. Uttar Pradesh is not likely to be affected by earthquake.

In ancient times people did not know the true causes of earthquake.
  • a)
    True
  • b)
    False
Correct answer is option 'A'. Can you explain this answer?

Amit Sharma answered
In ancient times earthquakes were thought to be caused by restless gods or giant creatures slumbering beneath the earth.Therefore, option (a)  In ancient times people did not know the true causes of earthquake is the correct✔ answer.

We should build heavy houses in a danger zone.
  • a)
    True
  • b)
    False
Correct answer is option 'B'. Can you explain this answer?

Shubham Sharma answered
Houses made up of Wood frame homes, properly resist earthquakes, ain't coming down in an earthquake up to about an 8.0. They can take a huge beating and still stand.

What happens when an ebonite rod rubbed with fur and a glass rod rubbed with silk are brought near each other?
  • a)
    They attract each other.
  • b)
    They repel each other.
  • c)
    Nothing happens to them.
  • d)
    They acquire heat.
Correct answer is option 'A'. Can you explain this answer?

Shraddha Menon answered
The charge on the ebonite rod rubbed with fur is negative (as it gains electrons). The charge on the glass rod rubbed with silk is positive (as it loses electrons). So, when these two rods are brought close to each other, they attract, since unlike charges attract each other.

State whether the following statement is True or False
An earthquake is a sudden shaking or trembling of the earth which lasts for a long time.
  • a)
    True
  • b)
    False
Correct answer is option 'B'. Can you explain this answer?

Lakshya Ias answered
False! An earthquake is a sudden shaking or trembling of the earth but it lasts for a very short time, not a long time. It happens quickly and can cause a lot of damage. People use special tools to measure earthquakes and see how powerful they are. It's like the earth is having a big shake!

Earthquake is caused by
a)Disturbance in mantle of earth
b)Disturbance deep inside the earth crust
c)Disturbance in upper layer of earth crust
d)Disturbance in core of earth
Correct answer is option 'B'. Can you explain this answer?

Sounak Sengupta answered
Earthquake is the sudden shaking or trembling of the earth for a short time caused by disturbance deep inside the earth’s crust. Internally, the earth is made up of four layers, the crust, mantle, outer core and inner core. The primary cause of an earthquake is faults on the crust of the earth. The cracks or sudden slips of the land are known as faults or fault planes. The point of origin of the earthquake is inside the earth and is known as the hypocenter. Maximum destruction is caused at the epicenter, the surface above the hypocenter. When there are sudden movements in the various layers of the earth, crust or mantle, concentric waves are produced. These waves are known as seismic waves and are of three types; Primary Waves (P-Waves), Secondary Waves (S-Waves) and Surface Waves (L-Waves). These waves have different patterns of movement. Earthquakes usually have foreshocks and aftershocks. The main earthquake or the one with the maximum magnitude is known as the main shock. Its intensity is calculated by the magnitude of seismic waves, measured with the help of a seismograph. The measurement is taken on the Richter scale. 

What is the lightning streaks that we see?
  • a)
    UV rays from the sun
  • b)
    Cosmic rays
  • c)
    Accumulated electric charges
  • d)
    IR rays from the sun
Correct answer is option 'C'. Can you explain this answer?

Tejas Sen answered
Electric Charges in Lightning Streaks

Lightning is a natural phenomenon that occurs during thunderstorms. It is a sudden and powerful discharge of electricity between the atmosphere and the ground or within the atmosphere itself. The lightning streaks that we see are caused by accumulated electric charges.

Electric Charges Build-up
During a thunderstorm, the movement of air currents within the clouds causes the collision of water droplets, ice particles, and other particles present. These collisions result in the separation of positive and negative charges within the cloud. The lighter ice crystals acquire positive charges, while the heavier raindrops acquire negative charges. This separation of charges creates an imbalance and an electric field within the cloud.

Formation of a Pathway
As the positive and negative charges continue to separate, the electric field within the cloud becomes stronger. Eventually, the opposing charges at the cloud's base and the ground attract each other, creating a pathway for the discharge of electricity. This pathway is formed by a step-like progression called a stepped leader.

Stepped Leader
The stepped leader is an invisible channel of charged particles that extends from the cloud towards the ground. It moves in a series of steps, each lasting only a fraction of a second. The stepped leader is not the actual lightning that we see, but it paves the way for the main lightning strike.

Return Stroke
When the stepped leader gets close to the ground, it creates a powerful electric field. This electric field ionizes the air molecules and creates a conductive path between the cloud and the ground. This conductive path is known as a return stroke.

The return stroke is the visible lightning that we see. It travels at an incredibly fast speed of about 100,000 miles per second. It is the intense flow of electrons from the ground to the cloud or between different parts of the cloud. The return stroke is what gives lightning its characteristic bright and branching appearance.

Conclusion
In conclusion, the lightning streaks that we see are caused by accumulated electric charges. During a thunderstorm, positive and negative charges separate within the cloud, resulting in an electric field. This electric field creates a pathway called a stepped leader, which then leads to the formation of a conductive path known as a return stroke. The return stroke is the visible lightning that we observe.

The area where earthquake are likely to occur are called
  • a)
    Seismic zone
  • b)
    Endangered region
  • c)
    Earth heating zone
  • d)
    Most dangerous area
Correct answer is option 'A'. Can you explain this answer?

Anushka Basu answered
Some area where chances of occurring earthquake is more than the others. Those are where earthquake are likely to occur are called seismic zone.

The electric charges produced by rubbing are called static charges.
  • a)
    True
  • b)
    False
Correct answer is option 'A'. Can you explain this answer?

Niti Banerjee answered
Static charges are electric charges that are produced by rubbing two objects together. When two objects are rubbed together, the friction between them causes electrons to transfer from one object to the other. This transfer of electrons creates an imbalance of electric charges, resulting in the production of static charges.

How static charges are produced
When two objects are rubbed together, the friction between them causes the outermost electrons of one object to be transferred to the other object. This transfer of electrons creates an excess of electrons on one object, giving it a negative charge, and a deficit of electrons on the other object, giving it a positive charge. The object that gains electrons becomes negatively charged, while the object that loses electrons becomes positively charged. These charges are known as static charges because they do not move or flow through a conductor.

Examples of static charges
Static charges can be observed in various everyday situations. Some examples include:

- Rubbing a balloon on a sweater and then sticking it to a wall.
- Rubbing a plastic comb through dry hair and then attracting small pieces of paper.
- Rubbing a glass rod with a silk cloth and then using it to attract small pieces of paper.

Characteristics of static charges
Static charges have several characteristics that distinguish them from other types of electric charges:

- They are produced by rubbing two objects together.
- They do not move or flow through a conductor.
- They can attract or repel other charged objects.
- They can cause objects to stick together or cling to surfaces.

Conclusion
In conclusion, the electric charges produced by rubbing two objects together are known as static charges. These charges are created through the transfer of electrons between the objects, resulting in an imbalance of electric charges. Static charges can be observed in various everyday situations and have distinct characteristics that differentiate them from other types of electric charges.

Benjamin Franklin showed lightning in
  • a)
    1725
  • b)
    1527
  • c)
    1752
  • d)
    1572.
Correct answer is option 'C'. Can you explain this answer?

Aditi Saxena answered
The correct answer is (c) 1752.
Benjamin Franklin is famous for his experiments with electricity, including his famous kite experiment in which he demonstrated the electrical nature of lightning. This experiment was conducted in 1752. Franklin's experiment involved flying a kite during a thunderstorm and collecting the electricity from the storm in a Leyden jar, which is a device used to store static electricity. The experiment proved that lightning is a form of electricity and laid the foundation for our understanding of electricity and the development of modern electrical technology. Franklin's experiment was a major milestone in the field of electricity and is still remembered and studied today.

What should you do if you hear thunder during a thunderstorm?
  • a)
    Run to an open field
  • b)
    Stay where you are
  • c)
    Rush to a safer place
  • d)
    Open an umbrella
Correct answer is option 'C'. Can you explain this answer?

Lohit Matani answered
When you hear thunder during a thunderstorm, it's important to rush to a safer place. Thunder is like a signal telling you that lightning could come soon, so it's safer to find a protected place until the storm passes. Remember, always stay safe during a thunderstorm!

How do positive and negative charges interact with each other?
  • a)
    They repel each other
  • b)
    They attract each other
  • c)
    They neutralize each other
  • d)
    They have no effect on each other
Correct answer is option 'B'. Can you explain this answer?

Ujwal Sengupta answered
Understanding Charge Interactions
When discussing the interaction between positive and negative charges, it's essential to understand the fundamental principles of electrostatics.
Nature of Charges
- Positive Charge: This type of charge is found in protons.
- Negative Charge: This type of charge is found in electrons.
Interaction Between Charges
- Attraction: Positive and negative charges experience a force of attraction. This means that when a positive charge comes near a negative charge, they will pull towards each other.
- Reason for Attraction: This attraction occurs due to electric fields generated by the charges. A positive charge creates an electric field that exerts a force on nearby negative charges, and vice versa.
Consequences of Charge Interaction
- Formation of Bonds: The attraction between positive and negative charges is responsible for the formation of ionic bonds in chemistry, where atoms transfer electrons to achieve stability.
- Stability of Matter: The interaction is crucial for the stability of atoms and molecules, leading to the diverse structures of matter we observe.
Repulsion of Like Charges
- Opposite Behavior: While positive and negative charges attract each other, like charges repel one another. This is why two positive charges or two negative charges will push away from each other.
Conclusion
In summary, the correct answer to the interaction between positive and negative charges is option 'B' because they attract each other, which is a foundational principle in the study of electricity and magnetism. Understanding this fundamental interaction is key to grasping more complex concepts in physics and chemistry.

During a thunderstorm, _____ charges collect near the upper edges of the clouds.
  • a)
    negative
  • b)
    positive
  • c)
    neutral
  • d)
    static
Correct answer is option 'B'. Can you explain this answer?

EduRev UPSC answered
During a thunderstorm, positive charges collect near the upper edges of the clouds, contributing to the separation of charges and the occurrence of lightning.

What is the purpose of a lightning conductor?
  • a)
    To attract lightning to buildings
  • b)
    To measure the magnitude of an earthquake
  • c)
    To protect buildings from lightning
  • d)
    To detect electric charges in the air
Correct answer is option 'C'. Can you explain this answer?

Ankita Kulkarni answered
Purpose of a Lightning Conductor
A lightning conductor, also known as a lightning rod, is a critical safety device designed to protect buildings and structures from the destructive effects of lightning strikes.
How Lightning Conductors Work
- Prevention of Damage: Lightning conductors redirect the electrical charge from a lightning strike safely into the ground, preventing damage to the building.
- Path of Least Resistance: They provide a low-resistance path for the lightning discharge, ensuring that the energy travels through the conductor rather than through the structure itself.
Components of a Lightning Conductor
- Rod: The lightning rod is typically made of conductive material like copper or aluminum, installed at the highest point of the building.
- Conductors: These cables connect the rod to the ground, facilitating the safe dissipation of electricity.
- Grounding System: A series of grounding electrodes or plates buried underground dissipate the electrical charge into the earth.
Benefits of Using Lightning Conductors
- Safety: They significantly reduce the risk of fire and structural damage, ensuring the safety of occupants within buildings.
- Insurance and Liability: Having a lightning conductor can also lower insurance premiums and reduce liability in case of a lightning strike.
Conclusion
In summary, the primary purpose of a lightning conductor is to protect buildings from lightning strikes by providing a safe path for electrical discharges, thereby safeguarding both the structure and its occupants.

The power of earthquake is measured in terms of
  • a)
    Fernier scale
  • b)
    Richter scale
  • c)
    Newton
  • d)
    Pascal
Correct answer is option 'B'. Can you explain this answer?

Sparsh Khanna answered
The Measurement of Earthquake Power
Earthquakes are natural phenomena that release energy, resulting in seismic waves. To quantify this energy release, scientists use scales. Among these, the Richter scale is the most commonly known.
What is the Richter Scale?
- The Richter scale, developed by Charles F. Richter in 1935, measures the magnitude of an earthquake.
- It assigns a single number to quantify the amount of energy released during the quake.
- The scale is logarithmic, meaning that each whole number increase on the scale represents a tenfold increase in measured amplitude and roughly 31.6 times more energy release.
Why is the Richter Scale Important?
- It provides a standardized way to communicate the strength of earthquakes.
- This information is crucial for emergency response, building codes, and public awareness.
- The scale helps scientists compare earthquakes occurring at different locations or times.
Other Scales for Measuring Earthquakes
- While the Richter scale is widely recognized, other scales exist, such as the Moment Magnitude Scale (Mw), which is more accurate for larger earthquakes.
- The Modified Mercalli Intensity Scale measures the effects of an earthquake, such as damage and human perception, rather than the energy released.
Conclusion
In summary, the correct answer to the question regarding how the power of earthquakes is measured is option 'B'—the Richter scale. It remains a fundamental tool for understanding and conveying the severity of seismic events.

What safety measure should you take if you are in a car during an earthquake?
  • a)
    Get out of the car immediately
  • b)
    Drive to a clear spot and stay in the car
  • c)
    Stand under a tall tree
  • d)
    Lie flat on the ground
Correct answer is option 'B'. Can you explain this answer?

Sahil Verma answered
Understanding Earthquake Safety in a Vehicle
During an earthquake, the safest action you can take while in a car is to drive to a clear spot and stay inside the vehicle. Here’s why this approach is recommended:
Staying Inside the Vehicle
- Protection from Debris: Vehicles provide a protective shell. Staying inside shields you from falling debris that could occur as buildings sway or collapse.
- Stability: Cars are designed to be stable. When an earthquake strikes, remaining in the car allows you to maintain a secure position, minimizing the risk of injury compared to standing outside.
Finding a Clear Spot
- Avoiding Hazards: Drive to an open area away from buildings, trees, overpasses, and power lines. This reduces the risk of being struck by falling objects and ensures that you are in a safer environment.
- Visibility: Being in a clear area enhances your visibility to other drivers and emergency responders, facilitating quicker assistance if needed.
What to Avoid
- Do Not Exit the Vehicle Immediately: Exiting a car during an earthquake can expose you to more danger, such as falling debris.
- Avoid Stopping Under Structures: Stopping under bridges or next to buildings can be hazardous due to the potential for collapsing structures.
In summary, during an earthquake, the best practice is to drive to a clear area, stay in your car, and remain calm until the shaking stops. Following these safety measures can greatly reduce the risk of injury and ensure a safer experience during such emergencies.

What is the force present between two charged bodies called?
  • a)
    Electrostatic force
  • b)
    Electromagnetic force
  • c)
    Gravitational force
  • d)
    Frictional force
Correct answer is option 'A'. Can you explain this answer?

Sagnik Iyer answered

Electrostatic Force:

The force present between two charged bodies is called the Electrostatic force. This force is a fundamental force of nature that acts between particles with electric charge. Here's a detailed explanation of the Electrostatic force:

Nature of Electrostatic Force:
- The Electrostatic force is a non-contact force that can act over a distance without the need for physical contact between the charged bodies.
- It is a conservative force, meaning that the work done by the force is independent of the path taken by the charged bodies.

Coulomb's Law:
- The magnitude of the Electrostatic force between two point charges is given by Coulomb's Law, which states that the force is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them.
- Mathematically, Coulomb's Law is expressed as F = k * (q1 * q2) / r^2, where F is the force, k is Coulomb's constant, q1 and q2 are the magnitudes of the charges, and r is the distance between the charges.

Types of Electrostatic Interactions:
- Like charges repel each other, while opposite charges attract. This behavior is a result of the Electrostatic force acting between the charged bodies.
- The Electrostatic force plays a crucial role in holding atoms together in molecules, as well as in the interaction between charged particles in various phenomena.

In conclusion, the force present between two charged bodies is known as the Electrostatic force, which is governed by Coulomb's Law and plays a significant role in various aspects of physics and chemistry.

Why is a lightning conductor installed on a building?
  • a)
    So that it collects the electric power present in the lightning
  • b)
    So that it repels the lightning that falls on the building
  • c)
    So that it forces the lightning to fall in an area where there are no buildings
  • d)
    So that it conducts electric charge to the ground when lightning strikes the building
Correct answer is option 'D'. Can you explain this answer?

Prerna Chavan answered
A lightning conductor is a metallic device installed on tall buildings to protect them from lightning striking the building during a thunderstorm. The charge from the lightning gets 'attracted? to the conductor. All the charge then flows through it to the ground instead of to the building.

During a thunderstorm, where do positive charges accumulate?
  • a)
    Near the lower edges of clouds
  • b)
    Near the upper edges of clouds
  • c)
    On the sides
  • d)
    In the air currents
Correct answer is option 'B'. Can you explain this answer?

Harshitha Choudhury answered
Accumulation of Positive Charges during a Thunderstorm:
There are various processes that occur during a thunderstorm, leading to the accumulation of positive charges near the upper edges of clouds.

Formation of Cumulonimbus Clouds:
- Thunderstorms are typically accompanied by cumulonimbus clouds, which are large, towering clouds associated with thunder, lightning, heavy rain, and strong winds.
- In these clouds, strong updrafts carry water droplets and ice crystals to higher altitudes, creating a separation of charges within the cloud.

Charge Separation:
- During the formation of cumulonimbus clouds, ice crystals and water droplets collide, leading to the separation of charges.
- The lighter, positively charged particles are carried to the upper edges of the cloud by the strong updrafts, while the heavier, negatively charged particles remain closer to the lower edges.

Accumulation of Positive Charges:
- As the storm intensifies, the positive charges continue to accumulate near the upper edges of the cloud.
- This accumulation of positive charges creates an imbalance with the negative charges at the lower edges of the cloud and on the ground.

Lightning Discharge:
- Eventually, the electrical potential difference between the positive and negative charges becomes too great, leading to a lightning discharge.
- Lightning strikes occur as a way to balance the electrical charges between the cloud and the ground, with the positive charges at the upper edges of the cloud being neutralized.
In conclusion, during a thunderstorm, positive charges accumulate near the upper edges of clouds due to the separation of charges within cumulonimbus clouds and the movement of charged particles by updrafts.

The like charges:
  • a)
    repel each other
  • b)
    attract each other
  • c)
    no interaction takes place
  • d)
    all of these.
Correct answer is option 'A'. Can you explain this answer?

Vaishnavi Pillai answered
Understanding Like Charges
When discussing electric charges, it's essential to understand how they interact with each other. The behavior of like charges is a fundamental principle in electrostatics.
Nature of Electric Charges
- Electric charges come in two types: positive and negative.
- Like charges refer to charges of the same type, either both positive or both negative.
Interaction Between Like Charges
- When two like charges come close to each other, they experience a force that pushes them apart. This phenomenon is known as repulsion.
Reason for Repulsion
- The repulsion occurs due to the electric field generated around each charge. When like charges are near, their electric fields interact in such a way that they exert a force pushing each other away.
Practical Examples
- A common example is when two balloons that have been rubbed on hair are brought close together. They will move away from each other due to the like charges accumulated on their surfaces.
Conclusion
- In summary, the correct answer to the question is indeed option 'A': like charges repel each other. Understanding this principle is crucial for further studies in electricity and magnetism.
By grasping the behavior of like charges, students can better understand the broader concepts of electric forces and fields in physics.

What are the boundaries of the Earth's tectonic plates called?
  • a)
    Fault zones
  • b)
    Poor zone
  • c)
    Volatile zone
  • d)
    Default zone
Correct answer is option 'A'. Can you explain this answer?

Abhiram Kulkarni answered
Understanding Tectonic Plate Boundaries
The boundaries of the Earth's tectonic plates are crucial to understanding geological processes. The correct term for these boundaries is "fault zones."
What are Fault Zones?
- Fault zones are fractures in the Earth's crust where two tectonic plates meet.
- These areas are characterized by significant geological activity, including earthquakes and volcanic eruptions.
Types of Fault Zones
- Transform Faults: Plates slide past each other, leading to friction and earthquakes. Example: San Andreas Fault in California.
- Convergent Boundaries: Plates move toward each other, often causing one plate to be thrust beneath another (subduction). This can create mountain ranges and deep ocean trenches.
- Divergent Boundaries: Plates move apart, allowing magma to rise and create new crust, such as mid-ocean ridges.
Why are Fault Zones Important?
- Fault zones are critical for understanding seismic activity, which can help in predicting earthquakes and mitigating their impact.
- They play a key role in shaping the Earth's landscape over geological time.
Conclusion
In summary, the boundaries of tectonic plates are known as fault zones. Understanding these areas is vital for comprehending the dynamic processes that shape our planet, including seismic activity and landform creation.

When you touch a charged body, the charge flows through you into the earth. What is this called?
  • a)
    Induction
  • b)
    Conduction
  • c)
    Capacitance
  • d)
    Earthing
Correct answer is option 'D'. Can you explain this answer?

Stuti Khanna answered
The process of a charge being conducted from a charged body to the earth is called earthing. Earthing protects us from electrical shocks due to leakage of electrical current and from lightning during a thunderstorm and rain.

Which scientist showed that lightening and sparks from clothes is same phenomenon?
  • a)
    Isaac Newton
  • b)
    Rutherford
  • c)
    Alfred Noble
  • d)
    Benjamin Franklin
Correct answer is option 'D'. Can you explain this answer?

Gargi Shah answered
Benjamin Franklin showed that lightening and sparks from clothes is same phenomenon. In both cases, opposite charge come in contact of each other to create spark.

Chapter doubts & questions for Some Natural Phenomena - Online Quizzes for Class 8 2025 is part of Class 8 exam preparation. The chapters have been prepared according to the Class 8 exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Class 8 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.

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