Fun with Magnets Test

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Fun with Magnets Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Which one of the following substances is the magnetic substances?

A
Mercury

B
Iron

C
Gold

D
Silver

Solution

Among the options iron is the magnetic substances. it is actually ferromagnetic material.
Question 2
1 / -0

When the north pole of a strong magnet is brought near to the north pole of a weak magnet then they will

A
Attract each other

B
Repel each other

C
First attract and then repel

D
First repel and then attract

Solution

When the north pole of a strong magnet is brought near to the north pole of a weak magnet then they will attract each other. The north pole of the strong magnet induces a weak south pole on the weak magnet. That is the reason for the attraction.
Question 3
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All magnetic materials lose their magnetic properties when :

A
Dipped in water

B
Dipped in oil

C
Brought near a piece of iron

D
Strongly heated

Solution

All the magnetic material lose their magnetic properties when strongly heated.
Every magnetic material has a temperature called the curie point, above which they will lose their magnetism.
Question 4
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Which of the following is used to make permanent magnets ?

A
Soft iron

B
Steel

C
Nichrome

D
Copper

Solution

Steel is used to make the permanent magnet because when steel bar is magnetised the domains change their shape due to the realignment of the dipoles having their axes parallel and in the same direction and this realignment of the dipoles within the domains is permanent. Hence, the steel possess permanent magnetism when magnetised. Where as iron bar also the same thing happens when magnetised but when the cause of the induced magnetism is removed, the mutual repulsive force between the like poles of the parallel dipoles disturbs and disarranges them. Hence, iron bar lost magnetism. Therefore, iron retains the magnetism temporarily.
Question 5
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When the N-pole of a magnet is placed near the S-pole of another magnet then it _______ the south pole.

A
repels

B
attracts

C
does nothing

D
can't say

Solution

We know that opposite poles of a magnet attract each other i.e, the north pole attracts the south pole and the south pole attracts the north.
So, the correct option is B.
Question 6
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Assertion: Steel is attracted by a magnet
Reason: Steel is not a magnetic substance

A
Both A and R are true and R is the correct explanation of A.

B
Both A and R are true and R is not correct explanation of A.

C
A is true, but R is false

D
A is false, but R is true

Solution

We know all magnets are metals but not all metals are magnet. And we know Iron (Fe) is attracted by magnet so all the substances made by iron will be attracted by magnet. So steel is also attracted by a magnet.Because steel is made of iron.
Hence option 'C' is correct.
Question 7
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The magnetic field is strongest near the :

A
Poles of the magnet

B
Ends of the magnet

C
Centre of the magnet

D
One quarter point from the poles of the magnet

Solution

The magnetic field is produced when a magnet is placed. These magnetic field maces closed curves, and starts from north and ends to south pole in air and from south to north in side the magnet. At poles distance between two poles is maximum so, magnetic moment and magnetic field strength is maximum.
OPTION : A.
Question 8
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Two bars of soft iron exactly alike are given. One of them is a magnet. Without using anything more, how would you find which is a magnet -

A
By bringing two bars near and noting which one is attractive. The attracting one is a magnet

B
By bringing two bars near and noting which one is repelling. One which repels is an ordinary iron.

C
By rubbing one bar with the other and noting which becomes a magnet. The bar which is magnetized is an ordinary iron.

D
One bar is placed flat horizontally on the table and the other bar is held vertical with its one end on the middle of the first bar. If there is the attraction between the two, the vertical bar is magnet otherwise ordinary iron.

Solution

If there is the attraction between the two, the vertical bar is magnet otherwise ordinary iron. This is the only way to recognize them since every magnet has a null point exactly in the middle of its geometric length. That point has no attractive or repulsive power.
Question 9
1 / -0

Few common pins are placed on a table with a glass top. A powerful bar magnet is moved under the glass top. Describe the movement of common pins.

A
move opposite to the direction of magnet

B
move in the direction of magnet

C
not move

D
be thrown up in air.

Solution

The magnetic field due to the magnet will cause the pins to get attracted towards the magnet. Therefore, the pins will move in the direction of the movement of the magnet.
Question 10
1 / -0

What does a student need to do to find out whether a material is a magnet?

A
Find out if the material is a metal or a non-metal.

B
Find out if the material is a conductor or a non-conductor.

C
Find out if the material can be attracted to a steel plate.

D
Find out if the material can be repelled by a compass.

Solution

You can test whether an object is magnetic or not by holding another magnet close to it. If the object is attracted to the magnet, then it too is magnetic. Here, the compass acts as a magnet.

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Re-Attempt Weekly Quiz Competition

Fun with Magnets Test - 5

Result

Fun with Magnets Test - 5

Score

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Rank

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SHARING IS CARING

Question 1

Mercury

Iron

Gold

Silver

Solution

Question 2

Attract each other

Repel each other

First attract and then repel

First repel and then attract

Solution

Question 3

Dipped in water

Dipped in oil

Brought near a piece of iron

Strongly heated

Solution

Question 4

Soft iron

Steel

Nichrome

Copper

Solution

Question 5

repels

attracts

does nothing

can't say

Solution

Question 6

Both A and R are true and R is the correct explanation of A.

Both A and R are true and R is not correct explanation of A.

A is true, but R is false

A is false, but R is true

Solution

Question 7

Poles of the magnet

Ends of the magnet

Centre of the magnet

One quarter point from the poles of the magnet

Solution

Question 8

By bringing two bars near and noting which one is attractive. The attracting one is a magnet

By bringing two bars near and noting which one is repelling. One which repels is an ordinary iron.

By rubbing one bar with the other and noting which becomes a magnet. The bar which is magnetized is an ordinary iron.

One bar is placed flat horizontally on the table and the other bar is held vertical with its one end on the middle of the first bar. If there is the attraction between the two, the vertical bar is magnet otherwise ordinary iron.

Solution

Question 9

move opposite to the direction of magnet

move in the direction of magnet

not move

be thrown up in air.

Solution

Question 10

Find out if the material is a metal or a non-metal.

Find out if the material is a conductor or a non-conductor.

Find out if the material can be attracted to a steel plate.

Find out if the material can be repelled by a compass.

Solution

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