Fun with Magnets Test

Result

Fun with Magnets Test - 11

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Weekly Quiz Competition

Question 1
1 / -0

By which of the following activity, a magnet can loose its property?

A
Excess of heating

B
Demagnetizing magnetic field

C
Sudden shock

D
All of the above

Solution

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.
Question 2
1 / -0

Where is maximum force of attraction in two magnets ?

A
In the centre

B
At the two ends

C
Can be anywhere

D
It is same everywhere

Solution

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
Question 3
1 / -0

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.

A
Permanent Magnet

B
Electromagnet

C
Temporary Magnet

D
None of the above

Solution

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.
Question 4
1 / -0

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.

A
P- Rubber, R- Wood

B
Q- Copper, R- Plastic

C
P- Rubber, Q- Iron

D
Q- Wood, R- glass

Solution

Rubber is a waterproof, non-conducting material that is elastic too. Iron is a waterproof, conducting material that is not elastic.
Question 5
1 / -0

A student tries to magnetise a short steel rod.Which of the following tests will show that he has succeeded?

A
Both ends of a magnet attract the rod

B
One end of magnet repels the rod

C
The rod picks up a small piece of paper

D
When freely suspended, the rod points in any direction.

Solution
Question 6
1 / -0

A magnet can be completely demagnetized by which one of the following processes?

A
Breaking the magnet into small pieces

B
Heating it slightly

C
Applying a reverse field of appropriate strength

D
Dropping it into ice cold water

Solution

A magnet can be completely demagnetized only by applying a reverse field equivalent coercivity of the material.
Question 7
1 / -0

Observe the pictures $$A$$ and $$B$$ given in the figure carefully.
Which of the following statement is correct for the given pictures?

A
In $$A$$, cars $$1$$ and $$2$$ will come closer and in $$B$$, cars $$3$$ and $$4$$ will come closer.

B
In $$A$$, cars $$1$$ and $$2$$ will move away from each other and in $$B$$, cars $$3$$ and $$4$$ will move away.

C
In $$A$$, cars $$1$$ and $$2$$ will move away and in $$B$$, $$3$$ and $$4$$ will come closer to each other.

D
In $$A$$, cars $$1$$ and $$2$$ will come closer to each other and in $$B$$, $$3$$ and $$4$$ will move away from each other.

Solution

In $$A$$, cars $$1$$ and $$2$$ will come closer to each other and in $$B$$, $$3$$ and $$4$$ will move away from each other.

Opposite poles attract each other and same poles repel each other as in case $$A$$, magnets on cars $$1$$ and $$2$$ are facing each other with opposite poles, the cars will be attracted. In case $$B$$, magnets on cars $$3$$ and $$4$$ are facing each other with the same pole, they will repel.
Question 8
1 / -0

Which action will not magnetise a rod?

A
Placing a copper rod inside a coil carrying a direct current

B
Stroking a steel rod with a permanent magnet

C
Hammering a steel rod aligned with the Earth's magnetic field

D
Placing a soft-iron rod close to a permanent magnet

Solution

Placing a copper rod inside a coil carrying a direct current will not magnetise it. Copper is not a magnetic material.

The statements in option B, C, D will magnetise the rod because these actions align the magnetic domains of rod in one direction. So the magnetic property of each domain will effectively get added up. Aligning the magnetic domains is possible in soft iron and steel rods.

So the answer is option A.
Question 9
1 / -0

A magnet can induce magnetism in

A
brass

B
aluminium

C
glass

D
steel

Solution

As the magnet can include the magnetism is femo magnetic materials.
Only, Brass is a I.M material.
Question 10
1 / -0

The material which is not suitable for making a permanent magnet is

A
Steel

B
Ticonal

C
Lead

D
Alnico

Solution

The most suitable material for making the permanent magnet should have magnetic nature. All the materials other than the lead are magnetic.
Therefore, option (C) is correct.

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Material	Waterproof	Conducts Electricity	Elastic
P	Yes	No	Yes
Q	Yes	Yes	No
R	Yes	Yes	Yes

Fun with Magnets Test - 11

Result

Fun with Magnets Test - 11

Score

-

Rank

-

SHARING IS CARING

Question 1

Excess of heating

Demagnetizing magnetic field

Sudden shock

All of the above

Solution

Question 2

In the centre

At the two ends

Can be anywhere

It is same everywhere

Solution

Question 3

Permanent Magnet

Electromagnet

Temporary Magnet

None of the above

Solution

Question 4

P- Rubber, R- Wood

Q- Copper, R- Plastic

P- Rubber, Q- Iron

Q- Wood, R- glass

Solution

Question 5

Both ends of a magnet attract the rod

One end of magnet repels the rod

The rod picks up a small piece of paper

When freely suspended, the rod points in any direction.

Solution

Question 6

Breaking the magnet into small pieces

Heating it slightly

Applying a reverse field of appropriate strength

Dropping it into ice cold water

Solution

Question 7

In $$A$$, cars $$1$$ and $$2$$ will come closer and in $$B$$, cars $$3$$ and $$4$$ will come closer.

In $$A$$, cars $$1$$ and $$2$$ will move away from each other and in $$B$$, cars $$3$$ and $$4$$ will move away.

In $$A$$, cars $$1$$ and $$2$$ will move away and in $$B$$, $$3$$ and $$4$$ will come closer to each other.

In $$A$$, cars $$1$$ and $$2$$ will come closer to each other and in $$B$$, $$3$$ and $$4$$ will move away from each other.

Solution

Question 8

Placing a copper rod inside a coil carrying a direct current

Stroking a steel rod with a permanent magnet

Hammering a steel rod aligned with the Earth's magnetic field

Placing a soft-iron rod close to a permanent magnet

Solution

Question 9

brass

aluminium

glass

steel

Solution

Question 10

Steel

Ticonal

Lead

Alnico

Solution

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