Fun with Magnets Test

Result

Fun with Magnets Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

Lisa did an experiment to find out which part of the magnet attracts the most pins. Which of these readings is correct?
Number of pins attracted by the part of the magnet
P Q R S

A
8 1 2 8

B
8 3 3 2

C
3 2 3 8

D
1 8 8 1

Solution
Question 2
1 / -0

The best way to separate a mixture of sand and iron filings is by the method of:

A
filtration

B
sedimentation

C
magnetic separation

D
using a compass

Solution

The magnetic separation is a process in which magnetically susceptible material is extracted from a mixture using magnetic force. This is best way to separate the mixture of sand and iron fillings as iron is attracted by magnet.
Question 3
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Seema had heard that rainwater is as good as distilled water. So she collected some rainwater in a clean glass tumbler and tested it using a tester. To her surprise, she found that the compass needle showed deflection. What could be the reasons?

A
Glass is magnetic in nature

B
Rainwater is contaminated by impurities suspended in the atmosphere

C
Distilled water is magnetic in nature

D
None of these

Solution

Dust, smoke, and particles from the air can contaminate rainwater before it lands on your roof. Roofing materials, gutters, piping, and storage materials can introduce harmful substances such as asbestos, lead, and copper into the water.
Question 4
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A magnetic compass shows a deflection when placed near a current-carrying wire. If the current in the wire is increased, how does the deflection of the compass get affected?

A
Increase

B
Decrease

C
Remain Same

D
Insufficient Data

Solution

A metallic wire carrying an electric current has associated with it a magnetic field. The magnitude of the magnetic field produced at a given point increases as the current through the wire increases. If the current is increased, the deflection also increases.
Question 5
1 / -0

Which of the following will NOT be attracted by a magnet?

A
Aluminium

B
Nickel

C
Gold

D
Cobalt

Solution

Magnetism is caused by unpaired electrons surrounding the atoms of the material. Due to a quantum mechanical property called “spin”, unpaired electrons induce a magnetic dipole (like the two poles of a bar magnet). This means that metallic gold has no unpaired electrons, and it does not display classical magnetism
Question 6
1 / -0

Look at the classification table below.
Which of the following correctly describes X, Y and Z?

A
Metals; Can sink; Can float

B
Metals; Can be magnetised; Cannot be magnetised

C
Metals; Cannot be attracted by magnet; Can be attracted by magnets

D
Metals: Can allow electricity to pass through: Cannot allow electricity to pass through

Solution

Iron, cobalt, copper, and aluminum are metals.
Materials that are attracted towards magnets are called magnetic materials. For example, iron and cobalt.
Materials that are not attracted towards the magnets are called non-magnetic materials. For example, copper and aluminum.
Metals are conductors. They allow electricity to pass through them.
Metals sink in water.
Question 7
1 / -0

The sure test of a magnet is:

A
Magnetic attraction

B
magnetic repulsion

C
both (a) and (b)

D
none of these

Solution
Question 8
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The needle of the compass is made of a magnet because it _______
(i) Attracts metal like iron and steel.
(ii) Gets deflected when a magnet is brought near to it
(iii) Comes to rest in East-West direction
(iv) Comes to rest in a North-South direction
Which of the above statements correctly fill the blank?

A
(i) & (ii)

B
(i), (ii) & (iv)

C
(ii) & (iv)

D
(ii) only.

Solution

A compass needle is also a magnetic material so it attracts other magnets and also gets deflected by another magnets when brought closer.A compass needle ,being a magnet, also attracts metals such as iron and steel.
A compass needle points north because the north pole of the magnet inside it is attracted to the south pole of Earth's built-in magnet.Similarly south pole of needle is attracted to the north pole of earth's built-in magnet.So the needle aligns itself in north-south direction.
Question 9
1 / -0

Simon stroked $$4$$ different nails with a bar magnet according to the direction of the arrows. Which nail will be magnetised ?

A

B

C

D

Solution

Solution
To magnetise an iron nail
Bring one pole of magnet on nail and stroke it.
then lift the pole and brig it back on the point where you started.
The correct option is B
Question 10
1 / -0

Which of the following is not attracted by a magnet?

A
Steel

B
Cobalt

C
Brass

D
Nickel

Solution

A magnet is an object which attracts pieces of iron, steel, cobalt, and nickel. Hence, Brass is not attracted by a magnet.
In their natural states, metals such as aluminum, brass, copper, gold, lead, and silver don't attract magnets because they are weak metals.