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CBSE Questions for Class 6 Physics Fun With Magnets Quiz 4 - MCQExams.com
CBSE
Class 6 Physics
Fun With Magnets
Quiz 4
A metal bar is confirmed to be a magnet when it
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Attracts all metal
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Attracts another magnet
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Attracts a piece of iron
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Repels a compass needle
Which of the following can be magnetic material?
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Wood
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Plastic
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Ceramic
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Iron
Explanation
$$\textbf{Explanation}$$
$$\bullet$$ Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called ferromagnetic (or ferrimagnetic).
$$\bullet$$These include the elements iron, nickel, and cobalt and their alloys, some alloys of rare-earth metals, and some naturally occurring minerals.
$$\textbf{Hence option D correct}$$
The force with which a magnet attracts objects like iron is called Magnetic force.
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True
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False
Explanation
Magnetic force, attraction or repulsion that arises between electrically charged particles because of their motion. It is the basic force responsible for such effects as the action of electric motors and the attraction of magnets for iron.
Which of the following is not a magnetic material?
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Steel
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Copper
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Nickel
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Cobalt
Explanation
$$\textbf{Explanation:}$$
$$\bullet$$Those materials which are not attracted by a magnet are called Non-magnetic materials
$$\bullet$$For example plastic, rubber, water,Copper etc are non-magnetic materials.
$$\bullet$$Non-magnetic substances cannot be magnetized.
$$\textbf{Hence option B correct}$$
Natural magnets were discovered in Greece.
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True
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False
Explanation
The first magnets were not invented, but rather were found from a naturally occurring mineral called magnetite. Traditionally, the ancient Greeks were the discoverers of magnetite. There is a story about a shepherd named Magnes whose shoe nails stuck to a rock containing magnetite.
State whether true or false.
Rubber is a magnetic material.
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True
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False
Explanation
Rubber is a non-magnetic material.
The materials which are not attracted by a magnet are called non- magnetic materials. All the substances other than iron, nickel, and cobalt are non-magnetic substances. For example plastic, rubber, water, etc are nonmagnetic materials. Non-magnetic substances cannot be magnetized.
Where are the poles of a bar magnet located?
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At the extreme ends
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At the middle of the bar
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A small distance prior to the extreme ends
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Poles don't exist for a bar magnet
Explanation
The north pole (N) and the south pole (S) of a bar magnet are located at its two end a small distance prior to the extreme ends.
A compass can be used to find the East-West direction at any place.
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True
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False
Explanation
A magnetic compass always points towards the North—South direction.
If the North—South direction is known, then the East—West direction can also be determined. This direction is perpendicular to the North-South direction, i.e., perpendicular to the compass needle in the same plane.
State whether true or false.
Like poles of magnets repel each other.
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True
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False
Explanation
A magnet attracts or repels other magnets, depending on their mutual orientation of North and South Poles. When placing like Poles of two Magnets together, the Magnets repel each other, However, if opposite poles are placed together, they attract each other.
At which part of a magnet is its magnetic force maximum?
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At the poles
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At the centre
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Between the centre and the poles
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None of these
Explanation
The magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole compared with the south pole. The force is weaker in the middle of the magnet and halfway between the pole and the center.
What happens when the N-pole of a magnet is brought near the N-pole of a suspended magnet?
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It attracts the suspended magnet
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It pushes the suspended magnet away
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It makes the suspended magnet rotate
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It doesn't effect the suspended magnet in any way
Explanation
A permanent magnet causes repulsion with one pole when the poles are brought in turn near a suspended magnet. An unmagnetised magnet material would be attracted to both poles. Magnetism can work over a distance and magnets can exert a force (push or pull) on objects without making contact with them.
when the N-pole of a magnet is brought near the N-pole of a suspended magnet It pushes the suspended magnet away
Identify the methods by which a magnet can lose their properties.
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Heating a magnet strongly
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Repeated hammering of the magnet
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Manet is dropped from some height
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All of the above
Explanation
The methods by which a magnet can lose its properties are:
$$(1)$$ Heating a magnet strongly
$$(2)$$ Hammering the magnet several times or repeated hammering
$$(3)$$ By dropping the magnet from some height
Identify the magnetic substances from the list given below :
Iron, steel, nickel, plastic, wood, copper, steel.
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iron
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nickel
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plastic
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steel
Explanation
Materials that can be magnetized, which are also the ones that are strongly attracted to a magnet, are called magnetic materials. These include iron, nickel, cobalt, some alloys of rare-earth metals, and some naturally occurring minerals such as lodestone.
Which of the following is a horse shoe magnet ?
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Explanation
A horseshoe magnet is a magnet made in the shape of a horseshoe. The magnet has two magnetic poles close together. This shape creates a strong magnetic field between the poles.
The purpose of a horseshoe magnet's shape is to place the poles as close together as possible.The total magnetic flux is the same,[i] but the field is greater, as it is spread over a smaller volume. A horseshoe is used, rather than a simpler C-shaped magnet, which is also used, because this places the maximum amount of magnetised material into the magnet, for given dimensions around the poles. A particularly large horseshoe magnet is U-shaped with long parallel sides, rather than the classical horseshoe.
If a bar magnet is cut into pieces its two edges will have ______ and __________ pole.
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North, North
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North, South
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South, South
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South, North
Explanation
A bar magnet is a rectangular object that has a magnetic field. Each end of a bar magnet is called a pole — one is north and the other south. When freely suspended, the magnet will align itself so that the end of its northern pole points towards the Earth's magnetic North Pole.
If a bar magnet is cut into pieces its two edges will have South and North pole as magnetic monopoles do no exist.
State whether true or false.
If given bar magnet was broken into pieces, it will now become two pieces with monopoles.
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True
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False
Explanation
If you cut a bar magnet into pieces then the end-labeled as North remains north and the other end formed will be south. Similarly, the end that was pointing south will be the pole and its opposite end will be the new north pole.
Which of the following is/are correct regarding location of a bar magnet?
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The north pole (N) and south pole (S) are located at the end of the bar magnet
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Normally north pole is located at the left end of the bar magnet
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Normally north pole is located at the right end of the bar magnet
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None of the above
Explanation
Magnets have both magnetic poles- north pole and south pole. The north pole and south pole are located at the end of the bar magnet.
Magnet was found in a place called :
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Asia
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Magnesia
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Europe
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Denmark
Explanation
Magnet was found in a place called Magnesia.
Which of the following is an example of types of magnets based on shape?
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Horse shoe magnet
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U shaped magnet
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Bar magnet
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Electromagnet
Explanation
A magnet is an object (generally a metal) that has a north and south pole, such that opposite poles attract and like poles repel. A magnet contains electrons that have both uneven orbits and uneven spins
There are many different types of permanent magnets available such as horseshoe magnets and weld clamp magnets, U-shaped magnets.
On the other hand the electromagnets can be of any shape and size.
An instrument which uses magnet to give direction is known as :
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compass
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motor
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vacuum cleaner
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Magna lock
Explanation
A compass is the instrument which uses magnet to give the direction.
___ pole of a normal magnet is directing in ___side of the earth. Fill in the blank.
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North, North
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North, South
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South, North
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South, South
Explanation
North pole of a normal magnet is directing in north side of the earth. This phenomenon is used to know the direction using compass.
Which of the following is not a type of magnet ?
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Ring magnet
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Horse shoe magnet
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Bar magnet
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Super magnet
Explanation
Super magnet is not a type of magnet
The term super magnet is a broad term and encompasses several families of rare-earth magnets that include seventeen elements in the periodic table; namely scandium, yttrium, and the fifteen lanthanides. First developed in the 1970’s and 80’s, super magnets are the strongest type of permanent magnets ever made, are ferromagnetic, meaning that like iron they can be magnetized, and have Curie temperatures that are below room temperature. This means that in their pure form, their magnetism only appears at low temperatures. However, since they can form compounds with transition metals such as iron, nickel, and cobalt, metals that have Curie temperatures well above room temperature, they can be used effectively at higher temperatures as well. The main advantage they have over conventional magnets is that their greater strength allows for smaller, lighter magnets to be used, ones that can do the same job but take up less space and require less material.
Magnets lose their properties significantly if
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Left in the open
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Touched with iron
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Dropped from a height repeatedly
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None of these
Which of the following process are used to make a magnet?
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Casting of magnetic material
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Pressing and sintering of magnetic material
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Extruding of magnetic material
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All of the above
Explanation
The casting of a magnetic material, pressing and sintering of magnetic material, and extruding of magnetic material are the processes used for making permanent magnets.
Lisa did an experiment to find out which part of the magnet attracts the most pins. Which of the following readings is correct regarding the number of pins attracted by the different parts of the magnet?
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P- 8; Q- 1; R- 2; S- 8
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P- 8; Q- 3; R- 3; S- 2
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P- 3; Q- 2; R- 3; S- 8
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P- 1; Q- 8; R- 8; S- 1
Explanation
P and S are the poles of the magnet and the magnetic forces is strongest at these ends. So, they will attract the maximum number of pins.
By which of the following activity, a magnet can loose its property?
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Excess of heating
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Demagnetizing magnetic field
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Sudden shock
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All of the above
Explanation
A magnet shows magnetic behaviour because of the presence of domains which are like tiny magnets with a particular orientation.
By all these actions, all the arranged magnetic domains which exhibit magnetic property due to their specific arrangement get rearranged and that specific formation of magnetic domain which is responsible for its magnetic behaviour is destroyed. And hence the magnet will loose its magnetic behaviour.
Where is maximum force of attraction in two magnets ?
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In the centre
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At the two ends
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Can be anywhere
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It is same everywhere
Explanation
The magnetic force of attraction is greater where the field lines are crowded. Since all the magnetic fields lines generate from the poles. The crowd of field lines is maximum near poles.
Hence Option B
A mixture of iron and nickel can be easily magnetised, even in a weak field. Which results in the formation of a ________. Fill in the blank.
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Permanent Magnet
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Electromagnet
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Temporary Magnet
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None of the above
Explanation
A mixture of iron and nickel is magnetised by applying an external magnetic field. This converts the mixture into a temporary magnet for the time when the field has been applied. It is because the tiny magnets (domains) of iron and nickel get aligned along the external magnetic field. They become demagnetised when the external field is removed.
Material
Waterproof
Conducts Electricity
Elastic
P
Yes
No
Yes
Q
Yes
Yes
No
R
Yes
Yes
Yes
Study the given table. Select the option that correctly identifies any two of them.
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P- Rubber, R- Wood
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Q- Copper, R- Plastic
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P- Rubber, Q- Iron
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Q- Wood, R- glass
Explanation
Rubber is a waterproof, non-conducting material that is elastic too. Iron is a waterproof, conducting material that is not elastic.
A student tries to magnetise a short steel rod.Which of the following tests will show that he has succeeded?
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Both ends of a magnet attract the rod
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One end of magnet repels the rod
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The rod picks up a small piece of paper
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When freely suspended, the rod points in any direction.
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