Fun with Magnets Test

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Fun with Magnets Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

Magnetite is a/an

A
Natural magnet

B
Electromagnet

C
U-shaped magnet

D
None of these

Solution

Magnetite($$Fe_3O_4$$ mineral) is natural magnet. It is attracted to a common magnet.
Tiny crystals of magnetite are present in many rocks. In the crystallization of an igneous rock, tiny crystals of magnetite form in the melt, and because they are magnetic, they orient themselves with the direction and polarity of Earth's magnetic field. This preserves the orientation of the Earth's magnetic field within the rock at the moment of crystallization.
Question 2
1 / -0

How is a compass used to find directions?

A
When suspended freely the compass needle aligns itself in the vertically up-down direction which gives us the perpendicular direction to the needle as north and south poles

B
When suspended freely the compass needle aligns itself in the east-west direction which gives us the perpendicular direction to the needle as north and south poles

C
When suspended freely the compass needle aligns itself in the north-south direction which gives us the direction of the north and south poles

D
When suspended freely the compass needle starts rotating in a particular plane and the axis of rotation perpendicular to the plane gives us north and south poles

E
None of the above

Solution
Question 3
1 / -0

Which of the following is a magnetic material?

A
Glass

B
Plastic

C
Copper

D
Iron

E
None of these

Solution
Question 4
1 / -0

The answer to which of the following options will distinguish between a magnetic material and a non-magnetic material?

A
Is it a metal of a non metal?

B
Is it a conductor or an insulator?

C
Can it be given an electric charge?

D
Does it affect the direction in which a compass needle points?

Solution

A magnetic compass points north because all magnets have two poles, a north pole and a south pole, and the north pole of one magnet is attracted to the south pole of another magnet.
When this magnetic compass is brought near a magnetic substance, there is change in the direction of the needle based on the polarity of the magnetic substance closer to it. Whereas for a non magnetic substance it is not so.
Hence, the direction in which a compass needle points will distinguish between a magnetic material and a non-magnetic material.
Question 5
1 / -0

What characteristics do magnetic substance have?

A
They can give a 'shock' when you touch them.

B
They can push or pull objects they are not touching.

C
They are always black and cold to touch.

D
They fall faster than other objects when you drop them.

Solution

The main characteristic of a magnet is that they attract or repel other objects without touching. The attraction and repulsion depends upon the property of the object. We feel like the magnet pushes the object when it is repelling and pull if it is attracting.
Question 6
1 / -0

The magnetic force between a magnet and a magnetic substance can cause:

A
change of position

B
change of shape

C
change of size

D
change of property

Solution

A magnet attracts a magnetic material thereby making it move from rest. Any change in shape or size due to a magnet is temporary.
So the correct option is A.
Question 7
1 / -0

A device consisting of small magnetic needle used to find direction of the earth's surface is called:

A
A magnetometer

B
A magnetic compass

C
A magnet

D
A pathfinder

E
Answer Required

Solution

A compass is usually a small box with a glass cover on it. A magnetized needle is pivoted inside the box, which can rotate freely. The compass also has a dial with directions marked on it. The compass is kept at the place where we wish to know the directions. Its needle indicates the north-south direction when it comes to rest. The compass is then rotated until the north and south marked on the dial are at the two ends of the needle
Question 8
1 / -0

In which direction, a freely suspended magnet aligns itself?

A
North-South

B
East-West

C
Vertically Up-Down

D
North East-South West

E
South East-North West

Solution

A freely suspended magnet always rests in the north-south direction because the magnetic south pole of the earth lies in the geographic north direction and the magnetic north pole of the earth lies in the geographical south direction.
Question 9
1 / -0

A magnet has ______ poles.

A
$$1$$

B
$$3$$

C
$$0$$

D
$$2$$

E
$$4$$

Solution

A magnet has $$2$$ poles. The end of the magnet that points towards the North is called its North-seeking end or the North pole of the magnet. The other end that points towards the South is called the South seeking end or the South pole of the magnet. All magnets have two poles whatever their shape may be.
Question 10
1 / -0

Where was the first natural magnet formed?

A
China

B
Greece

C
Egypt

D
USA

Solution

A Greek philosopher Thales of Miletus had discovered a naturally occurring ore of iron attracted small pieces of iron towards it. The ore was found in the district of Magnesia in Asia Minor in Greece.

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Fun with Magnets Test - 7

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Fun with Magnets Test - 7

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SHARING IS CARING

Question 1

Natural magnet

Electromagnet

U-shaped magnet

None of these

Solution

Question 2

When suspended freely the compass needle aligns itself in the vertically up-down direction which gives us the perpendicular direction to the needle as north and south poles

When suspended freely the compass needle aligns itself in the east-west direction which gives us the perpendicular direction to the needle as north and south poles

When suspended freely the compass needle aligns itself in the north-south direction which gives us the direction of the north and south poles

When suspended freely the compass needle starts rotating in a particular plane and the axis of rotation perpendicular to the plane gives us north and south poles

None of the above

Solution

Question 3

Glass

Plastic

Copper

Iron

None of these

Solution

Question 4

Is it a metal of a non metal?

Is it a conductor or an insulator?

Can it be given an electric charge?

Does it affect the direction in which a compass needle points?

Solution

Question 5

They can give a 'shock' when you touch them.

They can push or pull objects they are not touching.

They are always black and cold to touch.

They fall faster than other objects when you drop them.

Solution

Question 6

change of position

change of shape

change of size

change of property

Solution

Question 7

A magnetometer

A magnetic compass

A magnet

A pathfinder

Answer Required

Solution

Question 8

North-South

East-West

Vertically Up-Down

North East-South West

South East-North West

Solution

Question 9

$$1$$

$$3$$

$$0$$

$$2$$

$$4$$

Solution

Question 10

China

Greece

Egypt

USA

Solution

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