Solution of Chapter 13. Fun with Magnets (NCERT - Science Book)

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.

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 filing 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.

It 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.

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.

Write any two properties of a magnet.

Where are poles of a bar magnet located?

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

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

How is a compass used to find directions?

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 in stated in Column I. Possible reasons for the observed affects are mentioned in Column II. Match the statements given in Column I with those in Column II.