10 .fun with magnet

Question 1

1. Which of the following statements is correct about magnetite?
   a) It is an artificial magnet used in modern compasses.
   b) It only attracts iron and steel.
   c) It is a natural magnet capable of attracting magnetic materials like nickel and cobalt.
   d) It repels non-magnetic materials.

Answer 1

Answer:
c) It is a natural magnet capable of attracting magnetic materials like nickel and cobalt.

Explanation:
Magnetite is a naturally occurring magnetic material that attracts materials like iron, nickel, and cobalt. It does not repel non-magnetic materials as they remain unaffected.

Question 2

2. A freely suspended bar magnet aligns itself in which direction?
   a) East-West
   b) South-East
   c) North-South
   d) Random directions depending on its shape

Answer 2

Answer:
c) North-South

Explanation:
A freely suspended bar magnet aligns itself along the Earth’s magnetic field in the North-South direction due to the interaction with the Earth’s magnetic poles.

Question 3

. Which of the following materials will a magnet attract?

1 Iron
2 Nickel
3 Wood
4 Cobalt
Select the correct option using the codes given below:
a) 1 and 3 only
b) 1, 2, and 4 only
c) 2, 3, and 4 only
d) All of the above

Answer 3

Answer:
b) 1, 2, and 4 only

Explanation:
Magnetic materials like iron, nickel, and cobalt are attracted by magnets, whereas wood is a non-magnetic material.

Question 3

3. What happens when like poles of two magnets are brought close to each other?
   a) They attract each other strongly.
   b) They repel each other.
   c) They neither attract nor repel.
   d) They align themselves in opposite directions.

Answer 3

Answer:
b) They repel each other.

Explanation:
Like poles (e.g., North-North or South-South) repel due to the nature of the magnetic force between similar charges.

Question 3

Which of the following phenomena is the basis for a compass’s functionality?
a) Magnetic repulsion between like poles
b) Alignment of a magnet in the Earth’s magnetic field
c) Magnetic induction
d) Attraction of non-magnetic materials by the Earth’s magnetic field

Answer 3

Answer:
b) Alignment of a magnet in the Earth’s magnetic field

Explanation:
A compass works because its needle, a small bar magnet, aligns with the Earth’s magnetic field, pointing towards the geographic North.

Question 4

If a bar magnet is cut into two equal parts, what happens to its magnetic properties?
a) Each piece loses its magnetic poles.
b) Each piece forms a new magnet with its own North and South poles.
c) Only the original North pole is retained in one piece.
d) Magnetism is lost entirely.

Answer 4

Answer:
b) Each piece forms a new magnet with its own North and South poles.

Explanation:
When a magnet is cut, each piece retains its magnetic property, forming new North and South poles. This is due to the intrinsic nature of magnetic domains.

Question 5

Which of the following explains why a magnet attracts iron but not wood?
a) Iron is a better conductor than wood.
b) Iron can be temporarily magnetized, while wood cannot.
c) Wood is too light to be attracted by a magnet.
d) Magnets repel non-conductive materials like wood.

Answer 5

Answer:
b) Iron can be temporarily magnetized, while wood cannot.

Explanation:
Iron’s atomic structure allows it to become magnetized temporarily under the influence of a magnetic field, while wood lacks such properties.