Fun with Magnets Test

Result

Fun with Magnets Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

A student tries to magnetise a short steel rod, and succeeds in doing so. What does he observe ?

A
Both ends of the magnet attract the magnetised rod.

B
The magnetised rod picks up a small piece of paper.

C
One end of the magnet repels the magnetised rod.

D
When freely suspended, the magnetised rod does not point in any particular direction.

Solution

When the iron rod is magnetised, one end will behave as the North pole and the other end will behave as the South pole. Now, in case of magnets, like poles repel each other and unlike poles attract each other.
Question 2
1 / -0

In which of the following cases do magnets lose their property of magnetism ?

A
When magnets are dropped in water

B
When magnets are hammered

C
When magnets are stored separated by a piece of wood

D
When magnets are placed in a cold room

Solution

When magnets are hammered, they lose their magnetic property.
Question 3
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A magnet which has lost its magnetic property can be re-magnetised

A
by cooling

B
by heating first and then cooling

C
by cooling first and then heating

D
It cannot be re-magnetised.

Solution

By decreasing the temperature, we can regain the lost magnetic properties of magnetic materials.
Question 4
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You should not store a floppy disk near a magnet because ________.

A
the magnet will rust

B
the magnet will become weaker

C
the data on the disk may be erased

D
the magnet will break the disk

Solution

Floppy disk is a device which stores the data in the form of magnetic field. Hence, it is magnetic in nature.

When a magnet is brought near the floppy, the magnetic field of the magnet can disturb the magnetic field of the floppy, and as a result, the information on the disk can be erased.
Question 5
1 / -0

Ravi was standing with a magnetic compass in his hand. A bird flew in the direction opposite to the direction in which the compass needle was pointing. In which direction did the bird fly?

A
South

B
Northeast

C
North

D
West

Solution

A magnetic needle always points northwards. Now, the bird flew in a direction opposite to the direction in which the compass needle was pointing, so we can say that the bird flew towards south.
Question 6
1 / -0

What name is given to the device that makes a strong magnet by passing electricity through a coil of wire wrapped around a block of iron?

A
Electric kettle

B
Crane

C
Solenoid

D
Transformer

Solution

A solenoid is a coil of insulated or enameled wire wound around a rod-shaped form made of iron. It behaves as a magnet when current is passed through it. Solenoid is the generic term for a coil of wire used as an electromagnet. It also refers to any device that converts electrical energy to mechanical energy.
Question 7
1 / -0

Some heated iron filings get cooled when dipped in water. Which of the following statements is true ?

(a) They become non-magnetic due to heating and will not be attracted to a magnet.
(b) They become magnetised and align in a particular direction.
(c) They will still be attracted to a magnet.
(d) Water dissolves away the magnetism of the iron filings, so they are no longer attracted to a magnet.

A
(a) only

B
(b) only

C
(c) only

D
(d) only

Solution

Iron is a magnetic material and always remains a magnetic material irrespective of the number of times it is heated or cooled. Hence, statement (c) is true. It is a magnet that loses its magnetic properties on heating. Iron filings are not magnetised and thus, their magnetic properties do not change on heating. Hence, statement (a) is false. They cannot be magnetised on heating, so statement (b) is false. Magnetism is not some tangible matter that can be dissolved away in water. It is a physical property.
Question 8
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Raman applied force to separate two natural magnets : A and B, but he couldn't separate the magnets.

Which of the following statements is true according to the situation?

A
The force of attraction between the magnets is greater than the applied force.

B
The force of attraction between the magnets is less than the applied force.

C
Once two magnets join, they get fused together at the surface of contact and can never be separated again.

D
None of these

Solution

Since, Raman could not separate two magnets, the force of attraction between the two magnets was probably greater than the applied force.
Question 9
1 / -0

Which of the following statements is true if two identical bar magnets are cut into two identical pieces each, such that the first one is cut transverse to its length and the second one is cut along its length?

A
All four bar magnets are equally strong.

B
The bar magnet cut along its length is stronger than the other magnet.

C
The bar magnet cut transverse to its length is stronger than the other magnet.

D
The bar magnet cut transverse to its length loses its magnetism.

Solution

When we cut a magnet along the length, the area of cross-section is reduced. Hence, the magnetic pole strength reduces. So, the magnet which is cut perpendicular to its length is stronger.

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Re-Attempt Weekly Quiz Competition

Fun with Magnets Test - 2

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Fun with Magnets Test - 2

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SHARING IS CARING

Question 1

Both ends of the magnet attract the magnetised rod.

The magnetised rod picks up a small piece of paper.

One end of the magnet repels the magnetised rod.

When freely suspended, the magnetised rod does not point in any particular direction.

Solution

Question 2

When magnets are dropped in water

When magnets are hammered

When magnets are stored separated by a piece of wood

When magnets are placed in a cold room

Solution

Question 3

by cooling

by heating first and then cooling

by cooling first and then heating

It cannot be re-magnetised.

Solution

Question 4

the magnet will rust

the magnet will become weaker

the data on the disk may be erased

the magnet will break the disk

Solution

Question 5

South

Northeast

North

West

Solution

Question 6

Electric kettle

Crane

Solenoid

Transformer

Solution

Question 7

(a) only

(b) only

(c) only

(d) only

Solution

Question 8

The force of attraction between the magnets is greater than the applied force.

The force of attraction between the magnets is less than the applied force.

Once two magnets join, they get fused together at the surface of contact and can never be separated again.

None of these

Solution

Question 9

All four bar magnets are equally strong.

The bar magnet cut along its length is stronger than the other magnet.

The bar magnet cut transverse to its length is stronger than the other magnet.

The bar magnet cut transverse to its length loses its magnetism.

Solution

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