Fun with Magnets Test

Result

Fun with Magnets Test - 3

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Weekly Quiz Competition

Question 1
1 / -0

A bar magnet is heated strongly. Its magnetic strength

A
is likely to remain same

B
is likely to increase

C
is likely to decrease

D
none of the above

Solution

Heating a magnet will destroy long range ordering. In the case of heating, energy is provided to magnetic dipoles causing them to free themselves from the initial order, t

The atoms of a bar magnet can be considered as tiny magnets (having $N$ and $S$ poles) aligned in one direction.

When we heat a magnet at a high temperature, the heat energy frees the tiny magnets from their ordered orientation. This reduces or destroys the ordering of the tiny magnets. As a result, the magnet loses its magnetism, i.e. it gets demagnetised.
Question 2
1 / -0

Which one of the following substances is the magnetic substance?

A
Mercury

B
Iron

C
Gold

D
Silver

Solution

Electrons have magnetic moments, so they interact with magnets. However, in most solids, the electrons tend to line up in pairs so their magnetic moments cancel out. This means the solid has no net magnetic moment and doesn't interact strongly with magnets. However, in a small number of solids the outermost electrons of the atoms line up parallel with each other and their magnetic moments reinforce each other to give the solid a large net magnetic moment. These solids interact strongly with magnets and are called ferromagnetic. Only solids having unpaired electrons can be ferromagnetic, for example, iron.
Question 3
1 / -0

What kind of magnet is used in a magnetic compass ?

A
electromagnet

B
permanent magnet

C
temporary magnet

D
none of the above

Solution

Magnetic compass is used for navigation and its magnetic needle is made of permanent magnet which is always aligned according to the earth's magnetic field.
Question 4
1 / -0

What is the circular enclosure that the magnetic compass is placed in ?

A
iron case

B
stainless steel case

C
aluminium case

D
nickel case

Solution

The case of a magnetic compass should be made of a non-magnetic material.
Stainless steel serves the purpose.
Question 5
1 / -0

Which of the following is not attracted by a magnet?

A
bronze

B
steel

C
nickel

D
cobalt

Solution

Answer is A.

Bronze is an alloy of copper and zinc. Bronze is in no way magnetic, just like copper. Using even the strongest of magnets on copper, it will not attract.
Question 6
1 / -0

The marked end of a compass needle always points directly to

A
Earth's geographic South Pole

B
Earth's geographic North Pole

C
A magnet's south pole

D
A magnet's north pole

Solution

The marked end of a compass needle always points to the south pole of a magnet. We observe that the marked end of the needle shows us the direction of the geographic north pole. But, the geographic north pole of the earth is the south pole of the earth's magnet.
Question 7
1 / -0

How will hammering a bar magnet affect Its magnetic strength?

A
Is likely to increase

B
Is likely to decrease

C
Will not change

D
None of the above

Solution

When we hammer the magnet repeatedly, the vibration-induced on the magnet causes the magnetic dipoles to randomize which considerably reduces its strength.
Question 8
1 / -0

All magnets ___________.

A
Attract certain metals

B
Attract or repel another magnet

C
Both $$(1)$$ and $$(2)$$

D
Neither $$(1)$$ and $$(2)$$

Solution

A magnet is a material or object that produces a magnetic field. This magnetic field is invisible but is responsible for the most notable property of a magnet. When a magnetic material comes into a magnetic field, field will either attracts or repail.
Ex- A magnetic force pulls on other ferromagnetic materials, such as iron, and attracts or repels other magnets.
Question 9
1 / -0

Shaving blades are usually made of steel. They will

A
Be attracted by a magnet

B
Be repelled by a magnet

C
Be attracted only by natural magnets

D
Not be affected by magnets

Solution

Steel is a ferromagnetic material therefore its gets attracted by a magnet.
Question 10
1 / -0

For performing practical in lab ................ magnets are used

A
toroids

B
solenoids

C
horse shoe magnet

D
bar magnet

Solution

Bar magnets are used in labs for performing practicals it has two poles.

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Re-Attempt Weekly Quiz Competition

Fun with Magnets Test - 3

Result

Fun with Magnets Test - 3

Score

-

Rank

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SHARING IS CARING

Question 1

is likely to remain same

is likely to increase

is likely to decrease

none of the above

Solution

Question 2

Mercury

Iron

Gold

Silver

Solution

Question 3

electromagnet

permanent magnet

temporary magnet

none of the above

Solution

Question 4

iron case

stainless steel case

aluminium case

nickel case

Solution

Question 5

bronze

steel

nickel

cobalt

Solution

Question 6

Earth's geographic South Pole

Earth's geographic North Pole

A magnet's south pole

A magnet's north pole

Solution

Question 7

Is likely to increase

Is likely to decrease

Will not change

None of the above

Solution

Question 8

Attract certain metals

Attract or repel another magnet

Both $$(1)$$ and $$(2)$$

Neither $$(1)$$ and $$(2)$$

Solution

Question 9

Be attracted by a magnet

Be repelled by a magnet

Be attracted only by natural magnets

Not be affected by magnets

Solution

Question 10

toroids

solenoids

horse shoe magnet

bar magnet

Solution

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