Fun with Magnets Test

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Fun with Magnets Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

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

Every magnet has the capacity to sustain the magnetic property. When we start heating the magnet, it starts losing its magnetic property. If the magnet is strongly heated then it can not hold its magnetic property under that high temperature. Thus, it gets demagnetized losing all of its magnetic properties..
Question 2
1 / -0

The south seeking end is called _______ pole.

A
North

B
South

C
East

D
West

Solution

A freely suspended magnet always aligns in a north-south direction. The end of the magnet that points towards the south is called the north-seeking end or the south pole of the magnet.
Question 3
1 / -0

Fill in the blank:
A magnet has _______ poles

A
two

B
one

C
three

D
four

Solution

The two ends of a magnet, at which it has maximum attractive property, are called poles of the magnet. A magnet has two poles namely the north pole and the south pole.
Question 4
1 / -0

Magnetite contains which metal ?

A
Iron

B
Copper

C
Aluminium

D
Steel

Solution

Magnetite contains Iron.It is the most magnetic of all the naturally-occurring minerals on Earth. Naturally-magnetized pieces of magnetite, called lodestone, will attract small pieces of iron, which is how ancient peoples first discovered the property of magnetism. Today it is mined as iron ore.
Question 5
1 / -0

The magnet can be completely demagnized by

A
Breaking the magnet into small pieces

B
Heating it slightly

C
Dropping it into ice cold water

D
A reverse field of appropriate strength

Solution

The magnet can be completely demagnetized by reversing field of appropriate strength. This uses a magnetic field generated by a current flowing through solenoid to change the ordering of magnetic dipole. An AC current is used to produce magnetic field of changing direction near magnet. The electromagnetic field caused the magnetic dipoles to switch direction many times. By repeating this process many times as we gradually go to reduce strength of magnetic field, the magnetism of the magnet can be reduced to almost zero -- demagnetized.
Question 6
1 / -0

A permanent magnet

A
Attracts all substances

B
Attracts only ferromagnetic substances

C
Attracts magnetic substances and repels all others

D
Attracts some substances and repels others

Solution

Solution: In the materials like ferromagnetic the permanent magnet induces a magnetic field and therefore attracts them, whereas diamagnetic materials repel the magnet. A magnet can repel or attract the material depending upon the type of the material, diamagnetic, paramagnetic or ferromagnetic.
Hence, the correct option is (D).
Question 7
1 / -0

A magnet can be easily turned into a ______ by excessive heating. Fill in the blank.

A
Electromagnet

B
Permanent Magnet

C
Temporary Magnet

D
None

Solution

At around $$80^\circ C$$, a magnet will lose its magnetism and it will become demagnetized permanently if exposed to this temperature for a period, or if heated above their Curie temperature. Heat the magnet even more, and it will melt, and eventually vaporize.
Question 8
1 / -0

Find the odd one out :
Magnetite, Magnes, Magnesia, Bar magnet

A
Magnetite

B
Magnes

C
Magnesia

D
Bar magnet

Solution

Magnetite, Magnes, Magnesia, are ore of Iron.
Whereas Bar magnet is a magnetic substance called a magnet.
Magnetite is a rock mineral and one of the main iron ores, with the chemical formula Fe3O4. It is one of the oxides of iron, and is ferrimagnetic; it is attracted to a magnet and can be magnetized to become a permanent magnet itself. It is the most magnetic of all the naturally occurring minerals on Earth.
Question 9
1 / -0

Complete the following statements with an appropriate word / term to be filled in the blank space(s).
A compass needle is a ________ magnet :

A
small

B
big

C
fieldless

D
super

Solution

A compass is an extremely simple device. A magnetic compass consists of a small, lightweight magnet balanced on a nearly frictionless pivot point. No matter where you stand on Earth, you can hold a compass in your hand and it will point toward the north and south pole.
Question 10
1 / -0

Two bars of soft iron exactly same are given. One of them is a magnet. Without using any thing more, how would you find which is a magnet ?

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

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

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

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

Solution

One bar is placed flat horizontal on the table and the other bar is held vertical with its one end on the middle of first bar. If there is 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.

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Re-Attempt Weekly Quiz Competition

Fun with Magnets Test - 4

Result

Fun with Magnets Test - 4

Score

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SHARING IS CARING

Question 1

Dipped in water

Dipped in oil

Brought near a piece of iron

Strongly heated

Solution

Question 2

North

South

East

West

Solution

Question 3

two

one

three

four

Solution

Question 4

Iron

Copper

Aluminium

Steel

Solution

Question 5

Breaking the magnet into small pieces

Heating it slightly

Dropping it into ice cold water

A reverse field of appropriate strength

Solution

Question 6

Attracts all substances

Attracts only ferromagnetic substances

Attracts magnetic substances and repels all others

Attracts some substances and repels others

Solution

Question 7

Electromagnet

Permanent Magnet

Temporary Magnet

None

Solution

Question 8

Magnetite

Magnes

Magnesia

Bar magnet

Solution

Question 9

small

big

fieldless

super

Solution

Question 10

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

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

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

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

Solution

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