All Exams >
Grade 2 >
Science for Grade 2 >
All Questions
All questions of Forces and Magnets for Grade 2 Exam
Which types of magnet have two poles close to each other?- a)Bar magnet
- b)Horse-shoe magnet
- c)Cylindrical magnet
- d)Electromagnet
Correct answer is option 'B'. Can you explain this answer?
Which types of magnet have two poles close to each other?
a)
Bar magnet
b)
Horse-shoe magnet
c)
Cylindrical magnet
d)
Electromagnet
|
Sagar Mehta answered |
In horse-shoe types of magnet have two poles close to each other.
Q.The property of attracting iron or other magnetic materials is calleda)Refractionb)Magnetismc)Retardationd)ReflectionCorrect answer is option 'B'. Can you explain this answer?
|
Anoushka Sharma answered |
The property of attracting iron or other magnetic materials is called magnetism.
When a magnet is suspended freely it always aligns itself in -------- direction?- a)North
- b)N-S
- c)N-W
- d)N-E
Correct answer is option 'B'. Can you explain this answer?
When a magnet is suspended freely it always aligns itself in -------- direction?
a)
North
b)
N-S
c)
N-W
d)
N-E
|
Poulomi Chakraborty answered |
Freely Suspended Magnet always points in the North-South direction even in the absence of any other magnet. This suggests that the Earth itself behaves as a magnet which causes a freely suspended magnet (or magnetic needle) to point always in a particular direction.
In a battery cell, energy is stored in the form of- a)electrical energy.
- b)muscular energy.
- c)chemical energy.
- d)solar energy.
Correct answer is option 'C'. Can you explain this answer?
In a battery cell, energy is stored in the form of
a)
electrical energy.
b)
muscular energy.
c)
chemical energy.
d)
solar energy.
|
Edu Impact answered |
In a battery cell, energy stored is in the form of chemical energy.
Which of the following statements is NOT true?- a)Machines make work easy.
- b)Machines increase the speed of doing work.
- c)Machines change the direction of force
- d)Machines produce energy.
Correct answer is option 'D'. Can you explain this answer?
Which of the following statements is NOT true?
a)
Machines make work easy.
b)
Machines increase the speed of doing work.
c)
Machines change the direction of force
d)
Machines produce energy.
|
|
Sudhir Mehta answered |
Machines work when energy is provided to them and it does not produce energy.
Lodestone is a- a)Soft stone having shining surface
- b)Stone having magnetic property
- c)Stone having iron
- d)Stone having dark black colour
Correct answer is option 'B'. Can you explain this answer?
Lodestone is a
a)
Soft stone having shining surface
b)
Stone having magnetic property
c)
Stone having iron
d)
Stone having dark black colour
|
Sanskriti Tiwari answered |
A Lodestone is a naturally occurring piece of magnetic iron oxide. It is often bound in a brass frame, and is oriented to place the magnetic poles at the ends.
The word magnet comes from the region called Magnesia in Asia Minor. The word lodestone comes from the use of pieces of ore from Norway and Sweden which were suspended and used as guiding or leading stone; the Saxon word L�den means "to lead".
This example is from the apparatus collection at Colby College.Magnetism of a magnet is lost by doing which of the following acts- a)Keeping in a box
- b)Heating
- c)Hammering
- d)Both b and c
Correct answer is option 'D'. Can you explain this answer?
Magnetism of a magnet is lost by doing which of the following acts
a)
Keeping in a box
b)
Heating
c)
Hammering
d)
Both b and c
|
Nilanjan Unni answered |
The correct option is D.
Most permanent magnets can hold up to being dropped a few times, but it will lose strength from repeated strikes with a hammer.A magnet subjected to heat experiences a reduction in its magnetic field as the particles within the magnet are moving at an increasingly faster and more sporadic rate. This jumbling confuses and misaligns the magnetic domains, causing the magnetism to decrease.
Most permanent magnets can hold up to being dropped a few times, but it will lose strength from repeated strikes with a hammer.A magnet subjected to heat experiences a reduction in its magnetic field as the particles within the magnet are moving at an increasingly faster and more sporadic rate. This jumbling confuses and misaligns the magnetic domains, causing the magnetism to decrease.
---------- is the only natural magnet.- a)Magnetite
- b)Ebonite
- c)Cobalt
- d)Nickel
Correct answer is option 'A'. Can you explain this answer?
---------- is the only natural magnet.
a)
Magnetite
b)
Ebonite
c)
Cobalt
d)
Nickel
|
Raj Mukherjee answered |
Magnetic form of Magnetite is the only mineral that is a natural magnet. Due to the magnetism of Lodestone, small iron particles are often found clinging to its surfaces.
Which of the following cannot be used to make a magnet?- a)Cobalt
- b)Iron
- c)Ebonite
- d)Steel
Correct answer is option 'C'. Can you explain this answer?
Which of the following cannot be used to make a magnet?
a)
Cobalt
b)
Iron
c)
Ebonite
d)
Steel
|
Sarojini Singh answered |
Iron, cobalt and steel are ferromagnetic materials which can be used to make magnet but ebonite cannot be used to make magnets.
Unlike poles of magnets _____ each other.- a)Attract
- b)Repel
- c)Both a and b
- d)None
Correct answer is option 'A'. Can you explain this answer?
Unlike poles of magnets _____ each other.
a)
Attract
b)
Repel
c)
Both a and b
d)
None
|
Ishan Choudhury answered |
Unlike poles of different magnets attract each other; like poles repel each other.
Like poles of magnets -------- each other.- a)Attract
- b)Repel
- c)Both a and b
- d)None
Correct answer is option 'B'. Can you explain this answer?
Like poles of magnets -------- each other.
a)
Attract
b)
Repel
c)
Both a and b
d)
None
|
|
Manoj Iyer answered |
Like poles of two magnets repel each other, The force between them is non contact force and magnetic force.
Radha pushed a heavy table but failed to move it. Which of the following is TRUE of the above statement?- a)Energy is not spent but work is done.
- b)Energy is spent but work is not done.
- c)Energy is not spent and work is not done.
- d)Energy is spent and work is done.
Correct answer is option 'B'. Can you explain this answer?
Radha pushed a heavy table but failed to move it. Which of the following is TRUE of the above statement?
a)
Energy is not spent but work is done.
b)
Energy is spent but work is not done.
c)
Energy is not spent and work is not done.
d)
Energy is spent and work is done.
|
|
Sudhir Mehta answered |
Work is said to be done when an object is displaced or moved from one place to another by the application of force.
The ultimate source of our energy is- a)the sun.
- b)coal.
- c)wind.
- d)plants.
Correct answer is option 'A'. Can you explain this answer?
The ultimate source of our energy is
a)
the sun.
b)
coal.
c)
wind.
d)
plants.
|
|
Sudhir Mehta answered |
The ultimate source of energy is the sun.
The nerves in our body transmits messages as __________- a)Electrical impulses
- b)Radio waves
- c)Electromagnetic waves
- d)None
Correct answer is option 'A'. Can you explain this answer?
The nerves in our body transmits messages as __________
a)
Electrical impulses
b)
Radio waves
c)
Electromagnetic waves
d)
None
|
Vikas Choudhury answered |
The nerves in our body transmits messages as electrical impulses to the brain to transmit signals to different parts of the body.
And an electical impulse is nothing but the electrical impulse moving down an axon is called a nerve impulse.
Nerve impulses are an important part of how the nervous system communicates.
The activation of neurons triggers nerve impulses, which carry instructions from neuron to neuron and back and forth from the brain to the rest of the body.
To do work, we need- a)force.
- b)energy.
- c)hands.
- d)muscles.
Correct answer is option 'B'. Can you explain this answer?
To do work, we need
a)
force.
b)
energy.
c)
hands.
d)
muscles.
|
|
Sudhir Mehta answered |
We need energy to do work.
The North end of the freely suspended magnet points towards _____?
- a)Geographical North
- b)Geographical South
- c)Geographical East
- d)Geographical West
Correct answer is option 'A'. Can you explain this answer?
The North end of the freely suspended magnet points towards _____?
a)
Geographical North
b)
Geographical South
c)
Geographical East
d)
Geographical West
|
Aashna Chopra answered |
The earth behaves as a magnetic dipole . Therefore a freely suspended magnet always points towards in the north-south direction because the north pole of the suspended magnet attracts the south pole of the earth's magnet which is the geographical north pole of the earth.
When we throw a ball into air, it falls back. The force responsible for this is- a)Muscular force.
- b)Gravitational force.
- c)Mechanical force.
- d)none of these
Correct answer is option 'B'. Can you explain this answer?
When we throw a ball into air, it falls back. The force responsible for this is
a)
Muscular force.
b)
Gravitational force.
c)
Mechanical force.
d)
none of these
|
|
Sudhir Mehta answered |
The gravitational force of the earth pulls objects towards it.
If Ravi is able to move the table through a distance, then ____ is said to be done.- a)work
- b)force
- c)energy
- d)muscles
Correct answer is option 'A'. Can you explain this answer?
If Ravi is able to move the table through a distance, then ____ is said to be done.
a)
work
b)
force
c)
energy
d)
muscles
|
|
Sudhir Mehta answered |
Work is said to be done only when a push or pull moves something that has weight, through a distance.
______________ type of magnet is used in cranes to lift heavy containers from ships.- a)Bar magnet
- b)Cylindrical magnet
- c)Electromagnet
- d)Horseshoe magnet
Correct answer is option 'C'. Can you explain this answer?
______________ type of magnet is used in cranes to lift heavy containers from ships.
a)
Bar magnet
b)
Cylindrical magnet
c)
Electromagnet
d)
Horseshoe magnet
|
Abhishek Chakraborty answered |
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of wire wound into a coil.
Which of the following does not get demagnetised when a powerful magnet is kept near it- a)CD
- b)music system
- c)Cell phone
- d)Comb
Correct answer is option 'D'. Can you explain this answer?
Which of the following does not get demagnetised when a powerful magnet is kept near it
a)
CD
b)
music system
c)
Cell phone
d)
Comb
|
Ananya Das answered |
The correct answer is D as COMB does not get demagnetised when a powerful magnet is kept near it
When a N pole of a bar magnet is brought near the north pole of a freely suspended magnetic needle, then it -----------?- a)Attracts
- b)Repels
- c)It rotates
- d)None
Correct answer is option 'B'. Can you explain this answer?
When a N pole of a bar magnet is brought near the north pole of a freely suspended magnetic needle, then it -----------?
a)
Attracts
b)
Repels
c)
It rotates
d)
None
|
Kunal Mehta answered |
Shouldn't it be rotate as it is suspended freelyDepends upon the mass and the mag
Which of the following is a non- magnetic substance?
- a)Cobalt
- b)Nickel
- c)Iron
- d)Plastic
Correct answer is option 'D'. Can you explain this answer?
Which of the following is a non- magnetic substance?
a)
Cobalt
b)
Nickel
c)
Iron
d)
Plastic
|
|
Anjali Kapoor answered |
Iron, cobalt and nickel are magnetic materials.
______ is a device used by pilots and navigators used to find the direction.- a)Barometer
- b)Thermometer
- c)Magnetic compass
- d)None
Correct answer is option 'C'. Can you explain this answer?
______ is a device used by pilots and navigators used to find the direction.
a)
Barometer
b)
Thermometer
c)
Magnetic compass
d)
None
|
|
Anita Menon answered |
A magnetic compass is an instrument used for navigation and orientation that shows direction relative to the geographic cardinal directions (or points). Usually, a diagram called a compass rose shows the directions north, south, east, and west on the compass face as abbreviated initials.
Which of the following gets demagnetised when a powerful magnet is kept near it- a)Plastic ruler
- b)Compact disc
- c)Glass tumbler
- d)Wood
Correct answer is option 'B'. Can you explain this answer?
Which of the following gets demagnetised when a powerful magnet is kept near it
a)
Plastic ruler
b)
Compact disc
c)
Glass tumbler
d)
Wood
|
|
Vibhor Goyal answered |
The magnetic property of a compact disk may be damaged when a powerful magnet is kept near it. Plastic glass and wood are non-magnetic materials hence cannot be magnetised or demagnetised.
Which of the following gets attracted to a magnet?- a)Copy book
- b)Silver spoon
- c)Comb
- d)Common pins
Correct answer is option 'D'. Can you explain this answer?
Which of the following gets attracted to a magnet?
a)
Copy book
b)
Silver spoon
c)
Comb
d)
Common pins
|
Geetika Shah answered |
A magnet attracts the steel pin. When the pin touches the magnet it can't attract it any closer and it sticks to the magnet. However, a magnet will attract a pin from a distance.
How many combined north and south poles are present in a magnet if it is broken into 6 pieces without loss of magnetism?
- a)Six
- b)Twelve
- c)Two
- d)Zero
Correct answer is option 'B'. Can you explain this answer?
How many combined north and south poles are present in a magnet if it is broken into 6 pieces without loss of magnetism?
a)
Six
b)
Twelve
c)
Two
d)
Zero
|
Rishika Tiwari answered |
When a magnet is broken into pieces every piece will have 1 pair of north and south pole.
So if its broken into 6 pieces then each piece will be having one north pole and one south pole. So 6 north poles and 6 south poles, combined will be 12.
So if its broken into 6 pieces then each piece will be having one north pole and one south pole. So 6 north poles and 6 south poles, combined will be 12.
Magnets lose their properties significantly if- a)Left in the open
- b)Touched with iron
- c)Dropped from a height repeatedly
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
Magnets lose their properties significantly if
a)
Left in the open
b)
Touched with iron
c)
Dropped from a height repeatedly
d)
None of these
|
|
Akshaya Chandra answered |
As it is dropped from height the magnetic power gets spoiler due to the force of wind from the height. hope you understand
When a magnet is placed on a plastic plate with common pins spread on it, then ----- a)Pins stick all around the magnet
- b)Pins stick at the middle of the magnet
- c)Pins stick at the ends of the magnet
- d)None
Correct answer is option 'C'. Can you explain this answer?
When a magnet is placed on a plastic plate with common pins spread on it, then ----
a)
Pins stick all around the magnet
b)
Pins stick at the middle of the magnet
c)
Pins stick at the ends of the magnet
d)
None
|
|
Mrinalini Patel answered |
The poles of the magnet has more attraction of magnetic force. that's why pins stick ends of the magnet.
How can you identify the north pole of a magnet if it is not marked?- a)By using a compass to see which end aligns with the north.
- b)By the color of the magnet.
- c)By its shape.
- d)By its weight.
Correct answer is option 'A'. Can you explain this answer?
a)
By using a compass to see which end aligns with the north.
b)
By the color of the magnet.
c)
By its shape.
d)
By its weight.
|
Dr Manju Sen answered |
To identify the north pole of an unmarked magnet, you can use a compass. The end of the magnet that aligns with the north direction indicated by the compass is the north pole. This method is based on the fact that the north pole of a magnet is attracted to the Earth's magnetic North.
The south pole of the freely suspended magnet points towards ______?- a)Geographical South
- b)Geographical North
- c)Geographical East
- d)Geographical West
Correct answer is option 'B'. Can you explain this answer?
The south pole of the freely suspended magnet points towards ______?
a)
Geographical South
b)
Geographical North
c)
Geographical East
d)
Geographical West
|
Gunjan Lakhani answered |
Since the Earth's magnetic south pole is near the geographic north, the south pole of a magnet will be attracted to it, making it point towards the geographic north.
Artificial magnets are made in different shapes such as __________, __________, and ____________.- a)rectangular, cylindrical, spherical
- b)cubic, prismatic, triangular
- c)circular, flat, conical
- d)cylindrical, bar, horseshoe
Correct answer is option 'D'. Can you explain this answer?
a)
rectangular, cylindrical, spherical
b)
cubic, prismatic, triangular
c)
circular, flat, conical
d)
cylindrical, bar, horseshoe
|
Torcia Education answered |
Artificial magnets are commonly made in shapes like cylindrical, bar, and horseshoe. These shapes are practical for various applications and help in focusing the magnetic field in different ways. For instance, bar magnets are often used in classrooms for demonstrations, while horseshoe magnets are useful in applications requiring a stronger and concentrated magnetic field.
Which of the following is non-magnetic?- a)Cobalt
- b)Iron
- c)Nickel
- d)Copper
Correct answer is option 'D'. Can you explain this answer?
Which of the following is non-magnetic?
a)
Cobalt
b)
Iron
c)
Nickel
d)
Copper
|
|
Rounak Chawla answered |
Understanding Magnetic and Non-Magnetic Materials
Magnetic materials are those that are attracted to magnets and can be magnetized themselves. Non-magnetic materials do not exhibit these properties. Let's explore the given options.
Magnetic Materials
- Cobalt: A ferromagnetic metal, cobalt is attracted to magnets and can be magnetized.
- Iron: One of the most well-known magnetic materials, iron is highly attracted to magnets and is often used in magnetic applications.
- Nickel: Similar to cobalt and iron, nickel is also ferromagnetic and can be magnetized.
Non-Magnetic Material
- Copper: Unlike the above metals, copper is classified as a non-magnetic material. It does not get attracted to magnets and cannot be magnetized.
Why is Copper Non-Magnetic?
- Atomic Structure: The atomic structure of copper does not allow for the alignment of magnetic domains that is necessary for magnetism.
- Conductivity: Copper is known for its excellent electrical conductivity, which is a property that does not relate to magnetism.
Conclusion
In summary, while cobalt, iron, and nickel are all magnetic metals that can interact with magnets, copper stands out as a non-magnetic material. This distinction makes copper valuable in applications where magnetism may interfere, such as in electrical wiring and electronics.
Magnetic materials are those that are attracted to magnets and can be magnetized themselves. Non-magnetic materials do not exhibit these properties. Let's explore the given options.
Magnetic Materials
- Cobalt: A ferromagnetic metal, cobalt is attracted to magnets and can be magnetized.
- Iron: One of the most well-known magnetic materials, iron is highly attracted to magnets and is often used in magnetic applications.
- Nickel: Similar to cobalt and iron, nickel is also ferromagnetic and can be magnetized.
Non-Magnetic Material
- Copper: Unlike the above metals, copper is classified as a non-magnetic material. It does not get attracted to magnets and cannot be magnetized.
Why is Copper Non-Magnetic?
- Atomic Structure: The atomic structure of copper does not allow for the alignment of magnetic domains that is necessary for magnetism.
- Conductivity: Copper is known for its excellent electrical conductivity, which is a property that does not relate to magnetism.
Conclusion
In summary, while cobalt, iron, and nickel are all magnetic metals that can interact with magnets, copper stands out as a non-magnetic material. This distinction makes copper valuable in applications where magnetism may interfere, such as in electrical wiring and electronics.
Materials which are attracted towards a magnet are known by which name?- a)Magnetism
- b)Non-magnetic
- c)Manganese
- d)Magnetic
Correct answer is option 'D'. Can you explain this answer?
Materials which are attracted towards a magnet are known by which name?
a)
Magnetism
b)
Non-magnetic
c)
Manganese
d)
Magnetic
|
Sagnik Saha answered |
Materials attracted to a magnet are known as magnetic materials.
Explanation:
Magnetic materials are substances that can be attracted to a magnet. These materials have properties that allow them to interact with magnetic fields. When brought near a magnet, magnetic materials will either be drawn towards it or exhibit some form of magnetic behavior.
Examples of magnetic materials:
- Iron
- Nickel
- Cobalt
- Steel
These materials are made up of tiny magnetic domains, which are regions where the atoms or molecules are aligned in a specific way. In the absence of an external magnetic field, these domains may be randomly oriented, resulting in a net magnetization of zero. However, when a magnetic field is applied, the domains align, causing the material to become magnetized.
Properties of magnetic materials:
- Attraction to magnets: Magnetic materials are attracted to magnets and can be easily pulled towards them.
- Repulsion: Similar poles of magnets and magnetic materials repel each other.
- Magnetization: Magnetic materials can be magnetized, meaning they can develop a magnetic field of their own when exposed to a magnetic field.
- Retention of magnetism: Some magnetic materials can retain their magnetism even after the external magnetic field is removed. These are known as permanent magnets.
Applications of magnetic materials:
- Electric generators and motors: Magnetic materials are used extensively in the construction of electric generators and motors.
- Magnetic storage devices: Magnetic materials are used in hard drives and magnetic tapes to store and retrieve information.
- Magnetic separators: Magnetic materials are used to separate magnetic substances from non-magnetic substances in industries such as mining and recycling.
- Magnetic resonance imaging (MRI): Magnetic materials are crucial in MRI machines, which use magnetic fields to generate detailed images of the human body.
In conclusion, materials that are attracted to a magnet are called magnetic materials. They possess unique properties that allow them to interact with magnetic fields and find numerous applications in various fields.
Explanation:
Magnetic materials are substances that can be attracted to a magnet. These materials have properties that allow them to interact with magnetic fields. When brought near a magnet, magnetic materials will either be drawn towards it or exhibit some form of magnetic behavior.
Examples of magnetic materials:
- Iron
- Nickel
- Cobalt
- Steel
These materials are made up of tiny magnetic domains, which are regions where the atoms or molecules are aligned in a specific way. In the absence of an external magnetic field, these domains may be randomly oriented, resulting in a net magnetization of zero. However, when a magnetic field is applied, the domains align, causing the material to become magnetized.
Properties of magnetic materials:
- Attraction to magnets: Magnetic materials are attracted to magnets and can be easily pulled towards them.
- Repulsion: Similar poles of magnets and magnetic materials repel each other.
- Magnetization: Magnetic materials can be magnetized, meaning they can develop a magnetic field of their own when exposed to a magnetic field.
- Retention of magnetism: Some magnetic materials can retain their magnetism even after the external magnetic field is removed. These are known as permanent magnets.
Applications of magnetic materials:
- Electric generators and motors: Magnetic materials are used extensively in the construction of electric generators and motors.
- Magnetic storage devices: Magnetic materials are used in hard drives and magnetic tapes to store and retrieve information.
- Magnetic separators: Magnetic materials are used to separate magnetic substances from non-magnetic substances in industries such as mining and recycling.
- Magnetic resonance imaging (MRI): Magnetic materials are crucial in MRI machines, which use magnetic fields to generate detailed images of the human body.
In conclusion, materials that are attracted to a magnet are called magnetic materials. They possess unique properties that allow them to interact with magnetic fields and find numerous applications in various fields.
What happens if you heat a magnet?- a)It becomes stronger.
- b)It becomes weaker.
- c)It changes color.
- d)It gains electrical properties.
Correct answer is option 'B'. Can you explain this answer?
a)
It becomes stronger.
b)
It becomes weaker.
c)
It changes color.
d)
It gains electrical properties.
|
Sankar Saha answered |
Understanding the Effect of Heat on Magnets
When a magnet is exposed to heat, it undergoes significant changes that affect its magnetic properties. The correct answer to the question is that it becomes weaker. Here's a detailed explanation:
How Heat Affects Magnetism
- Disruption of Magnetic Domains:
Magnets are composed of tiny regions called magnetic domains, which are aligned in a specific direction. When heated, these domains can become misaligned due to increased thermal energy.
- Loss of Alignment:
As the temperature rises, the kinetic energy of the atoms increases, causing the domains to lose their fixed alignment. This misalignment leads to a decrease in the overall magnetic strength of the magnet.
Temperature Threshold
- Curie Point:
Every magnetic material has a specific temperature known as the Curie point. Once this temperature is reached, the material loses its permanent magnetism entirely and can become a non-magnetic substance.
Practical Implications
- Applications in Everyday Life:
This principle is crucial in various applications, such as in electric motors, where excessive heat can cause magnets to weaken, leading to reduced efficiency.
- Safety Considerations:
Understanding the effects of heat can help in handling magnets safely, avoiding situations that might lead to their weakening.
In conclusion, heating a magnet results in a decrease in its strength due to the disruption of its internal structure.
When a magnet is exposed to heat, it undergoes significant changes that affect its magnetic properties. The correct answer to the question is that it becomes weaker. Here's a detailed explanation:
How Heat Affects Magnetism
- Disruption of Magnetic Domains:
Magnets are composed of tiny regions called magnetic domains, which are aligned in a specific direction. When heated, these domains can become misaligned due to increased thermal energy.
- Loss of Alignment:
As the temperature rises, the kinetic energy of the atoms increases, causing the domains to lose their fixed alignment. This misalignment leads to a decrease in the overall magnetic strength of the magnet.
Temperature Threshold
- Curie Point:
Every magnetic material has a specific temperature known as the Curie point. Once this temperature is reached, the material loses its permanent magnetism entirely and can become a non-magnetic substance.
Practical Implications
- Applications in Everyday Life:
This principle is crucial in various applications, such as in electric motors, where excessive heat can cause magnets to weaken, leading to reduced efficiency.
- Safety Considerations:
Understanding the effects of heat can help in handling magnets safely, avoiding situations that might lead to their weakening.
In conclusion, heating a magnet results in a decrease in its strength due to the disruption of its internal structure.
Electric bell is an example of _____________magnet.- a)Bar magnet
- b)Cylindrical magnet
- c)Electromagnet
- d)Horseshoe magnet
Correct answer is option 'C'. Can you explain this answer?
Electric bell is an example of _____________magnet.
a)
Bar magnet
b)
Cylindrical magnet
c)
Electromagnet
d)
Horseshoe magnet
|
Swara Mukherjee answered |
An electric bell contains an electromagnet, consisting of coils of insulated wire wound round iron rods. When an electric current flows through the coils, the rods become magnetic and attract a piece of iron attached to a clapper. The clapper hits the bell and makes it ring.
It has a needle, which is itself a magnet.What is it - a)Magnet
- b)Clock
- c)Compass
- d)All of these
Correct answer is option 'C'. Can you explain this answer?
It has a needle, which is itself a magnet.What is it
a)
Magnet
b)
Clock
c)
Compass
d)
All of these
|
|
Dr Manju Sen answered |
A compass has a needle that is magnetized and points towards the Earth's magnetic poles. The needle in a compass is indeed a magnet, which aligns itself with the Earth's magnetic field, helping users determine directions.
Thus, the correct answer is C: Compass.
What happens to the energy of an object when it is lifted to a higher position?- a)The energy decreases.
- b)The energy remains the same.
- c)The energy increases as potential energy.
- d)The energy changes into chemical energy.
Correct answer is option 'C'. Can you explain this answer?
a)
The energy decreases.
b)
The energy remains the same.
c)
The energy increases as potential energy.
d)
The energy changes into chemical energy.
|
|
Riya Singh answered |
When an object is lifted to a higher position, its potential energy increases. This is because it has the potential to do more work due to its elevated position.
A bar magnet is immersed in a heap of iron filings and pulled out. The amount of iron filing clinging to the- a)North pole is almost equal to the south pole.
- b)North pole is much more than the south pole.
- c)North pole is much less than the south pole.
- d)Magnet will be same all along its length.
Correct answer is option 'A'. Can you explain this answer?
A bar magnet is immersed in a heap of iron filings and pulled out. The amount of iron filing clinging to the
a)
North pole is almost equal to the south pole.
b)
North pole is much more than the south pole.
c)
North pole is much less than the south pole.
d)
Magnet will be same all along its length.
|
|
Sounak Ghoshal answered |
Understanding the Behavior of a Magnet with Iron Filings
When a bar magnet is immersed in iron filings and pulled out, the distribution of the filings can reveal important properties of magnetism.
Magnetic Poles
- A bar magnet has two distinct poles: the North pole and the South pole.
- Each pole has a magnetic field that attracts iron filings.
Attraction of Iron Filings
- North Pole Attraction: The North pole attracts iron filings due to its magnetic field, causing a significant amount of filings to cling to it.
- South Pole Attraction: Similarly, the South pole attracts iron filings, but the amount can vary based on the strength of the magnet and its orientation.
Equal Clinging of Iron Filings
- Observations show that the amount of filings clinging to the North pole is almost equal to that clinging to the South pole.
- This is because both poles have similar strengths, allowing them to attract comparable amounts of filings.
Why Option A is Correct
- The equal clinging of iron filings to both poles indicates that the magnet's effect is balanced.
- While there might be slight variations, the general principle is that both poles attract iron filings effectively.
Conclusion
- When analyzing the clinging iron filings, it becomes clear that the North and South poles of a magnet have a nearly equal capacity to attract iron filings, leading to the correct answer being option A.
When a bar magnet is immersed in iron filings and pulled out, the distribution of the filings can reveal important properties of magnetism.
Magnetic Poles
- A bar magnet has two distinct poles: the North pole and the South pole.
- Each pole has a magnetic field that attracts iron filings.
Attraction of Iron Filings
- North Pole Attraction: The North pole attracts iron filings due to its magnetic field, causing a significant amount of filings to cling to it.
- South Pole Attraction: Similarly, the South pole attracts iron filings, but the amount can vary based on the strength of the magnet and its orientation.
Equal Clinging of Iron Filings
- Observations show that the amount of filings clinging to the North pole is almost equal to that clinging to the South pole.
- This is because both poles have similar strengths, allowing them to attract comparable amounts of filings.
Why Option A is Correct
- The equal clinging of iron filings to both poles indicates that the magnet's effect is balanced.
- While there might be slight variations, the general principle is that both poles attract iron filings effectively.
Conclusion
- When analyzing the clinging iron filings, it becomes clear that the North and South poles of a magnet have a nearly equal capacity to attract iron filings, leading to the correct answer being option A.
What will happen when three bar magnets are hung in the manner as shown below?
- a)Nothing will happen.
- b)Magnet Y will turn round and round.
- c)Magnet Y will move towards magnet Z
- d)Magnet Y will move towards magnet X.
Correct answer is option 'D'. Can you explain this answer?
What will happen when three bar magnets are hung in the manner as shown below?
a)
Nothing will happen.
b)
Magnet Y will turn round and round.
c)
Magnet Y will move towards magnet Z
d)
Magnet Y will move towards magnet X.
|
Rahul Mehra answered |
Magnet Y will get attracted towards magnet X and repelled by magnet -Z.
What is the role of energy in a moving car?- a)It keeps the car stationary.
- b)It allows the car to remain in a fixed position.
- c)It is converted into kinetic energy to move the car.
- d)It prevents the car from moving.
Correct answer is option 'C'. Can you explain this answer?
a)
It keeps the car stationary.
b)
It allows the car to remain in a fixed position.
c)
It is converted into kinetic energy to move the car.
d)
It prevents the car from moving.
|
|
Edu Impact answered |
In a moving car, energy is converted into kinetic energy, which is used to propel the car forward. This energy is essential for the car's movement and operation.
How does friction help in daily activities?- a)It allows objects to slide easily without resistance.
- b)It helps us grip surfaces and move effectively.
- c)It increases the speed of objects.
- d)It reduces the force required to push objects.
Correct answer is option 'B'. Can you explain this answer?
a)
It allows objects to slide easily without resistance.
b)
It helps us grip surfaces and move effectively.
c)
It increases the speed of objects.
d)
It reduces the force required to push objects.
|
Bespoke Classes answered |
Friction helps in gripping surfaces and moving effectively. It provides the necessary resistance to prevent slipping and enables control during movement.
State whether the following statement is True or FalseMagnets can attract pieces of iron.- a)True
- b)False
Correct answer is option 'A'. Can you explain this answer?
State whether the following statement is True or False
Magnets can attract pieces of iron.
a)
True
b)
False
|
|
Torcia Education answered |
- When you have a magnet, and you bring it close to some pieces of iron, like iron nails or paper clips, the pieces of iron will stick to the magnet. This is because magnets have special powers to attract iron objects.
- So, the statement that says "Magnets can attract pieces of iron" is True.
------------ is the surest test of magnetism.- a)Attraction
- b)Rotation
- c)Repulsion
- d)None
Correct answer is option 'C'. Can you explain this answer?
------------ is the surest test of magnetism.
a)
Attraction
b)
Rotation
c)
Repulsion
d)
None
|
|
Ishaan Chawla answered |
Repulsion
Repulsion is the surest test of magnetism because it is a unique property of magnets. When two magnets are brought close to each other, they can either attract or repel each other.
Explanation
- When two magnets repel each other, it indicates that they have like poles facing each other. This is a characteristic property of magnets and helps in identifying the presence of magnetism.
- Repulsion is a more reliable test compared to attraction because some materials that are not magnetized can still be attracted to magnets due to their magnetic properties.
- By observing repulsion between two magnets, we can confirm the presence of magnetism in the materials.
Significance
- Repulsion is a fundamental property of magnets and plays a crucial role in various applications of magnetism such as in magnetic levitation, magnetic resonance imaging (MRI), and electric motors.
- Understanding repulsion helps in distinguishing between magnetic and non-magnetic materials, which is essential in various scientific and technological fields.
In conclusion, repulsion is the surest test of magnetism as it is a unique property of magnets that helps in identifying the presence of magnetism in materials.
Energy can be defined as- a)the capacity to do work.
- b)work done in unit time.
- c)a push or a pull.
- d)attraction between two oppositely charged particles.
Correct answer is option 'A'. Can you explain this answer?
Energy can be defined as
a)
the capacity to do work.
b)
work done in unit time.
c)
a push or a pull.
d)
attraction between two oppositely charged particles.
|
|
Sudhir Mehta answered |
Energy can be defined as the capacity to do work.
In which of the following activities is force used for pulling?- a)Blowing air into a balloon
- b)Cycling
- c)Stretching a rubber band
- d)All of the above
Correct answer is option 'C'. Can you explain this answer?
In which of the following activities is force used for pulling?
a)
Blowing air into a balloon
b)
Cycling
c)
Stretching a rubber band
d)
All of the above
|
|
Sudhir Mehta answered |
Stretching of a rubber band is an example of a pulling force.
Which of the following is the best way to keep magnets?- a)
- b)
- c)
- d)
Correct answer is option 'D'. Can you explain this answer?
Which of the following is the best way to keep magnets?
a)
b)
c)
d)
|
Anirudh Kumar answered |
Soft iron placed across the poles will preserve the magnetism for a long time.
When a pin wheel is placed against wind, it begins to spin. This proves that- a)moving air has energy
- b)pin wheel has life
- c)pin has energy
- d)moving air has no energy.
Correct answer is option 'A'. Can you explain this answer?
When a pin wheel is placed against wind, it begins to spin. This proves that
a)
moving air has energy
b)
pin wheel has life
c)
pin has energy
d)
moving air has no energy.
|
|
Sudhir Mehta answered |
Moving air has energy. Since moving air can make a pin-wheel move, it has energy.
Which of the following activities would need energy the most?- a)Riding a bicycle up a hill
- b)Walking
- c)Riding a bicycle on a level ground
- d)Doing homework
Correct answer is option 'A'. Can you explain this answer?
Which of the following activities would need energy the most?
a)
Riding a bicycle up a hill
b)
Walking
c)
Riding a bicycle on a level ground
d)
Doing homework
|
|
Sudhir Mehta answered |
Riding a bicycle up a hill need more energy.
What is a common characteristic of materials that are attracted to magnets?- a)They are usually non-metallic.
- b)They contain iron, nickel, or cobalt.
- c)They are made of plastic or rubber.
- d)They are always colored red.
Correct answer is option 'B'. Can you explain this answer?
a)
They are usually non-metallic.
b)
They contain iron, nickel, or cobalt.
c)
They are made of plastic or rubber.
d)
They are always colored red.
|
|
Dr Manju Sen answered |
Materials that are attracted to magnets typically contain iron, nickel, or cobalt. These materials are magnetic, meaning they can be attracted by a magnet due to their magnetic properties. This characteristic is used to identify magnetic and non-magnetic materials in various contexts.
Chapter doubts & questions for Forces and Magnets - Science for Grade 2 2025 is part of Grade 2 exam preparation. The chapters have been prepared according to the Grade 2 exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for Grade 2 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
Chapter doubts & questions of Forces and Magnets - Science for Grade 2 in English & Hindi are available as part of Grade 2 exam.
Download more important topics, notes, lectures and mock test series for Grade 2 Exam by signing up for free.
Science for Grade 2
16 videos|81 docs|26 tests
|
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup