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All questions of Magnetism for Class 8 Exam
How do magnetic field lines behave around a magnet?- a)They connect like poles.
- b)They are only present at the north pole.
- c)They must not touch or cross each other.
- d)They can cross each other.
Correct answer is option 'C'. Can you explain this answer?
How do magnetic field lines behave around a magnet?
a)
They connect like poles.
b)
They are only present at the north pole.
c)
They must not touch or cross each other.
d)
They can cross each other.
 | Rahul Kumar answered |
Magnetic field lines must not touch or cross each other. They represent the direction and strength of the magnetic field, with lines connecting opposite poles (north to south). This property ensures clarity in understanding the magnetic field's behavior and interactions.
What is the function of an electromagnet in an electric bell?- a)To hold the bell in place
- b)To keep the power supply stable
- c)To move the hammer that strikes the bell
- d)To provide constant sound
Correct answer is option 'C'. Can you explain this answer?
What is the function of an electromagnet in an electric bell?
a)
To hold the bell in place
b)
To keep the power supply stable
c)
To move the hammer that strikes the bell
d)
To provide constant sound
 | Subset Academy answered |
In an electric bell, the electromagnet functions to move the hammer that strikes the bell when the circuit is closed. This mechanism creates a ringing sound, and the cycle repeats until the power is disconnected. It demonstrates how electromagnets can convert electrical energy into mechanical motion.
What is one method to increase the strength of an electromagnet?- a)Increasing the current through the coil
- b)Using a non-magnetic core
- c)Decreasing the number of turns in the coil
- d)Using a thicker wire
Correct answer is option 'A'. Can you explain this answer?
What is one method to increase the strength of an electromagnet?
a)
Increasing the current through the coil
b)
Using a non-magnetic core
c)
Decreasing the number of turns in the coil
d)
Using a thicker wire
 | Freak Artworks answered |
Increasing the current through the coil is one effective method to enhance the strength of an electromagnet. A higher current generates a stronger magnetic field, making the electromagnet more effective in its applications, such as lifting heavier loads in scrapyards or in electric motors.
What is the primary component of the Earth's core responsible for generating its magnetic field?- a)Silicon
- b)Lead
- c)Gold
- d)Iron
Correct answer is option 'D'. Can you explain this answer?
What is the primary component of the Earth's core responsible for generating its magnetic field?
a)
Silicon
b)
Lead
c)
Gold
d)
Iron
| | Subset Academy answered |
The Earth's core is primarily composed of iron, which is a magnetic metal. The movement of molten iron in the outer core generates the Earth's magnetic field through the dynamo effect. This core composition is crucial for maintaining the planet's magnetic characteristics.
What effect do two north poles of magnets have on each other?- a)They attract each other.
- b)They repel each other.
- c)They do not interact.
- d)They create a neutral field.
Correct answer is option 'B'. Can you explain this answer?
What effect do two north poles of magnets have on each other?
a)
They attract each other.
b)
They repel each other.
c)
They do not interact.
d)
They create a neutral field.
 | Torcia Education answered |
Two north poles repel each other due to the nature of magnetic forces. This repulsion occurs because like poles (north-north or south-south) push away from each other, while opposite poles (north-south) attract. Understanding this interaction helps in predicting the behavior of magnets in various applications.
What role does the density of magnetic field lines play in understanding a magnet's strength?- a)It shows the temperature of the magnet.
- b)It determines the strength of the magnetic field.
- c)It indicates the color of the magnet.
- d)It reveals the age of the magnet.
Correct answer is option 'B'. Can you explain this answer?
What role does the density of magnetic field lines play in understanding a magnet's strength?
a)
It shows the temperature of the magnet.
b)
It determines the strength of the magnetic field.
c)
It indicates the color of the magnet.
d)
It reveals the age of the magnet.
| | Torcia Education answered |
The density of magnetic field lines indicates the strength of the magnetic field. The closer the lines are to each other, the stronger the magnetic field in that area. This visual representation helps in grasping how powerful a magnet is and how it will interact with other magnetic materials.
What type of magnet maintains a constant magnetic field that cannot be switched off?- a)Permanent magnet
- b)Temporary magnet
- c)Electromagnet
- d)Superconductor
Correct answer is option 'A'. Can you explain this answer?
What type of magnet maintains a constant magnetic field that cannot be switched off?
a)
Permanent magnet
b)
Temporary magnet
c)
Electromagnet
d)
Superconductor
 | Edgy Education answered |
A permanent magnet maintains a constant magnetic field that cannot be switched off. These magnets are made from materials that have a strong magnetic property and can retain their magnetism over time, unlike electromagnets, which can be turned on or off by controlling the electric current.
What happens to the magnetic field when a current flows through an electromagnet's coil?- a)It disappears completely.
- b)It becomes weaker.
- c)It remains unchanged.
- d)It becomes stronger and magnetizes the core.
Correct answer is option 'D'. Can you explain this answer?
What happens to the magnetic field when a current flows through an electromagnet's coil?
a)
It disappears completely.
b)
It becomes weaker.
c)
It remains unchanged.
d)
It becomes stronger and magnetizes the core.
 | Tutorpedia Coaching answered |
When an electric current flows through an electromagnet's coil, it generates a magnetic field, which magnetizes the core material. This allows for the creation of a controllable magnet whose strength can be adjusted by changing the current or the number of turns in the coil.
How can the poles of an electromagnet be reversed?- a)By using a different power source
- b)By increasing the current
- c)By changing the core material
- d)By wrapping the coil in the opposite direction
Correct answer is option 'D'. Can you explain this answer?
How can the poles of an electromagnet be reversed?
a)
By using a different power source
b)
By increasing the current
c)
By changing the core material
d)
By wrapping the coil in the opposite direction
| | Freak Artworks answered |
The poles of an electromagnet can be reversed by wrapping the coil in the opposite direction or by reversing the connections to the power supply. This ability to change the polarity is crucial for applications where the direction of magnetic force needs to be controlled.
What type of core material is best for creating strong electromagnets?- a)Plastic
- b)Copper
- c)Wood
- d)Soft iron
Correct answer is option 'D'. Can you explain this answer?
What type of core material is best for creating strong electromagnets?
a)
Plastic
b)
Copper
c)
Wood
d)
Soft iron
| | Torcia Education answered |
Soft iron is the best core material for creating strong electromagnets because it can be easily magnetized and demagnetized. This property allows for rapid changes in magnetic strength, making soft iron ideal for applications requiring quick activation and deactivation of the magnetic field.
What are the two poles of a magnet called?- a)North and South
- b)Alpha and Omega
- c)East and West
- d)Positive and Negative
Correct answer is option 'A'. Can you explain this answer?
What are the two poles of a magnet called?
a)
North and South
b)
Alpha and Omega
c)
East and West
d)
Positive and Negative
| | Subset Academy answered |
A magnet has two poles known as the north (N) and south (S) poles. These poles are essential in determining the behavior of magnets, as opposite poles attract each other while like poles repel. This fundamental property of magnets is crucial for various applications, including navigation and electric motors.
What is the primary material used to create a strong electromagnet?- a)Iron
- b)Copper
- c)Aluminum
- d)Plastic
Correct answer is option 'A'. Can you explain this answer?
What is the primary material used to create a strong electromagnet?
a)
Iron
b)
Copper
c)
Aluminum
d)
Plastic
| | Torcia Education answered |
Iron is primarily used to create strong electromagnets because it is a ferromagnetic material, meaning it can be easily magnetized. The combination of a coil of wire and an iron core allows for the efficient generation of a strong magnetic field when current is applied.
What is the significance of the compass needle pointing toward magnetic north?- a)It shows the location of the South Atlantic anomaly.
- b)It aligns with the Earth's magnetic field.
- c)It helps in identifying magnetic materials.
- d)It indicates the direction of the geographic south pole.
Correct answer is option 'B'. Can you explain this answer?
What is the significance of the compass needle pointing toward magnetic north?
a)
It shows the location of the South Atlantic anomaly.
b)
It aligns with the Earth's magnetic field.
c)
It helps in identifying magnetic materials.
d)
It indicates the direction of the geographic south pole.
| | Edgy Education answered |
The compass needle points toward magnetic north because it aligns itself with the Earth's magnetic field. This property of compasses has been essential for navigation throughout history, allowing explorers and travelers to find their way using the Earth's magnetic orientation.
What natural phenomenon is caused by the interaction of solar particles with the Earth's magnetic field?- a)Earthquakes
- b)Hurricanes
- c)Auroras
- d)Lightning
Correct answer is option 'C'. Can you explain this answer?
What natural phenomenon is caused by the interaction of solar particles with the Earth's magnetic field?
a)
Earthquakes
b)
Hurricanes
c)
Auroras
d)
Lightning
| | Tutorpedia Coaching answered |
Auroras, also known as the Northern and Southern Lights, are caused by the interaction between solar particles and the Earth's magnetic field. When these charged particles collide with gases in the Earth's atmosphere, they produce beautiful light displays near the poles, showcasing the dynamic nature of our planet's magnetic field.
How does an electromagnet differ from a permanent magnet?- a)A permanent magnet requires electricity to work.
- b)An electromagnet can be turned on or off.
- c)An electromagnet cannot be turned off.
- d)An electromagnet's strength is constant.
Correct answer is option 'B'. Can you explain this answer?
How does an electromagnet differ from a permanent magnet?
a)
A permanent magnet requires electricity to work.
b)
An electromagnet can be turned on or off.
c)
An electromagnet cannot be turned off.
d)
An electromagnet's strength is constant.
| | Tutorpedia Coaching answered |
An electromagnet can be turned on or off by controlling the electric current flowing through its coil, unlike a permanent magnet, which has a constant magnetic field. This characteristic allows electromagnets to be used in various applications where magnetic fields need to be controlled.
What do migratory birds use for navigation during long-distance flights?- a)The Earth's magnetic field
- b)Landmarks
- c)Weather patterns
- d)The stars
Correct answer is option 'A'. Can you explain this answer?
What do migratory birds use for navigation during long-distance flights?
a)
The Earth's magnetic field
b)
Landmarks
c)
Weather patterns
d)
The stars
| | Rahul Kumar answered |
Migratory birds utilize the Earth's magnetic field for navigation over long distances. They possess a unique ability to sense magnetic fields, helping them determine their position and direction during migration, which is essential for their survival.
When was the last recorded reversal of the Earth's magnetic field?- a)1 million years ago
- b)4,000 years ago
- c)200,000 years ago
- d)500,000 years ago
Correct answer is option 'D'. Can you explain this answer?
When was the last recorded reversal of the Earth's magnetic field?
a)
1 million years ago
b)
4,000 years ago
c)
200,000 years ago
d)
500,000 years ago
| | Tutorpedia Coaching answered |
The last recorded reversal of the Earth's magnetic field occurred approximately 500,000 years ago. This phenomenon, known as geomagnetic reversal, involves the switching of the magnetic north and south poles and is a natural occurrence in Earth's geological history.
What is one application of electromagnets in scrapyards?- a)To measure metal thickness
- b)To secure vehicles
- c)To sort and lift iron and steel
- d)To hold non-magnetic metals
Correct answer is option 'C'. Can you explain this answer?
What is one application of electromagnets in scrapyards?
a)
To measure metal thickness
b)
To secure vehicles
c)
To sort and lift iron and steel
d)
To hold non-magnetic metals
| | Subset Academy answered |
In scrapyards, electromagnets are used to sort and lift iron and steel materials. They can easily attract these magnetic metals while leaving non-magnetic materials behind. This functionality enhances the efficiency of recycling processes.
What is the area around a magnet where its magnetic effects can be felt called?- a)Magnetic Zone
- b)Magnetic Field
- c)Magnetic Region
- d)Magnetic Space
Correct answer is option 'B'. Can you explain this answer?
What is the area around a magnet where its magnetic effects can be felt called?
a)
Magnetic Zone
b)
Magnetic Field
c)
Magnetic Region
d)
Magnetic Space
| | Subset Academy answered |
The area around a magnet where its effects can be detected is referred to as the magnetic field. This field can be visualized through magnetic field lines, which show the strength and direction of the magnet's influence. The field is strongest at the poles and decreases in strength as one moves away from the magnet.
What is a characteristic of magnetic field lines near the poles of a magnet?- a)They form a straight line.
- b)They curve away from the magnet.
- c)They are concentrated and close together.
- d)They are spaced far apart.
Correct answer is option 'C'. Can you explain this answer?
What is a characteristic of magnetic field lines near the poles of a magnet?
a)
They form a straight line.
b)
They curve away from the magnet.
c)
They are concentrated and close together.
d)
They are spaced far apart.
| | Tutorpedia Coaching answered |
Near the poles of a magnet, magnetic field lines are concentrated and close together, indicating a stronger magnetic field in that area. This density of lines visually represents the strength of the magnetic force, which is critical for understanding how magnets interact with objects.
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