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Chapter 13 Fun with Magnets Solutions

Question - 1 : -
Fill in the blanks in the following

(i) Artificial magnets are made in different shapes such as __________, __________ and ____________.
(ii) The Materials which are attracted towards a magnet are called________.
(iii) Paper is not a ______ material.
(iv) In olden days, sailors used to find direction by suspending a piece of ___________.
(v) A magnet always has __________ poles.

Answer - 1 : -

(i) Artificial magnets are made in different shapes such as bar magnet, horse shoe and cylindrical.

(ii) The Materials which are attracted towards a magnet are called magnetic.

(iii) Paper is not a magnetic material.

(iv) In olden days, sailors used to find direction by suspending a piece of magnet.

(v) A magnet always has two poles.

Question - 2 : -
State whether the following statements are true or false:

(i) A cylindrical magnet has only one pole.
(ii) Artificial magnets were discovered in Greece.
(iii) Similar poles of a magnet repel each other.
(iv) Maximum iron filings stick in the middle of a bar magnet when it is brought near them.
(v) Bar magnets always point towards North-South direction.
(vi) A compass can be used to find East-West direction at any place.
(vii) Rubber is a magnetic material.

Answer - 2 : -

i) False
ii) False
iii) True
iv) False
v) True
vi) True
ii) False

Question - 3 : - ┬аIt was observed that a pencil sharpener gets attracted by both the poles of a magnet although its body is made of plastic. Name a material that might have been used to make some part of it.

Answer - 3 : -

Iron might have been used to make some part of it.

Question - 4 : - Column I shows different positions in which one pole of a magnet is placed near that of the other. Column II indicates the resulting action between them for each situation. Fill in the blanks.

Column тАУ I

Column тАУ II

N-N

_______

N-

Attraction

S-N

_____

-S

Repulsion

Answer - 4 : -

Column тАУ I

Column тАУ II

N-N

Repulsion

N-┬аS

Attraction

S-N

Attraction

SтАУ S

Repulsion

Question - 5 : - Write any two properties of a magnet.

Answer - 5 : -

Properties of a magnet are as follows

  1. It attracts objects made of Nickel, Cobalt and Iron.
  2. Magnet directs the side in north and south direction.

Question - 6 : - Where are poles of a bar magnet located?

Answer - 6 : -

On two ends of a bar magnet.

Question - 7 : - A bar magnet has no markings to indicate its poles. How would you find out near which end is its north pole is located?

Answer - 7 : -

A bar magnet is hanged in the air and the end pointing to the north is the north pole of the magnet.

Question - 8 : - You are given an iron strip. How will you make it into a magnet?

Answer - 8 : -

Take a bar magnet and keep in contact with one of its poles with one edge of the bar of iron.

  1. Without lifting the bar magnet, move it along the length of the iron bar till you reach the other end.
  2. Lift the magnet and bring the pole (the same pole you started with) to the same point of the iron bar from which we began.
  3. Move the magnet again along the iron bar in the same direction as you did before.
  4. Repeat this process for about 30-40 times.

Question - 9 : - ┬аHow is a compass used to find directions?

Answer - 9 : -

A compass always shows north and south direction, by keeping this as a reference we can always find east and west directions also.

Question - 10 : - A magnet was brought from different directions towards a toy boat that has been floating in water in a tub. Affect observed in each case is stated in Column I. Possible reasons for the observed effects are mentioned in Column II. Match the statements given in Column I with those in Column II.

Column I

Column II

The boat gets attracted towards the magnet

The boat is fitted with a magnet with a north pole towards its head

The boat is not affected by the magnet

The boat is fitted with a magnet with a south pole towards its head

The boat moved towards the magnet when the north pole is brought near its head

The boat has a small magnet fixed along its length

A boat moves away from the magnet when the north pole is brought near its head

The boat is made up of magnetic material

Boat floats without changing its direction

The boat is made up of non-magnetic material

Answer - 10 : -

Column I

Column II

The boat gets attracted towards the magnet

The boat is made up of magnetic material

The boat is not affected by the magnet

The boat is made up of non-magnetic material

The boat moved towards the magnet when the north pole is brought near its head

The boat is fitted with a magnet with the south pole towards its head

A boat moves away from the magnet when the north pole is brought near its head

The boat is fitted with a magnet with a north pole towards its head

Boat floats without changing its direction

The boat has a small magnet fixed along its length

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