Write true or false for each statement.

(a) Artificial magnets are weaker than natural magnets.

(b) Poles of a magnet cannot be separated.

(c) A magnet can attract only a magnetic substance.

(d) A magnet has no effect when it is heated to a high temperature.

(e) Permanent magnets get easily demagnetised.

(f) Magnetic poles occur in pairs.

(g) Single touch method is better than the electrical method for making a magnet.

(h) Magnetic keeper is a wooden piece.

(i) Copper cannot be magnetised.

(a) False because artificial magnets are stronger than natural magnets.

(b) True as magnetic poles always exist in pairs so it is not possible to separate the two poles of a magnet.

(c) True because the substances that get attracted by a magnet are called magnetic substances.

(d) False since a magnet can be demagnetised i.e., the magnetic properties of a magnet can be destroyed by heating the magnet to a high temperature.

(e) False as permanent magnets do not get easily demagnetised.

(f) True since magnetic poles always exist in pairs.

(g) False because the electrical method is actually better than the single touch method for making a magnet as it produces stronger and more uniform magnets, can magnetize objects more quickly and allows control over the strength of the magnet by varying current or number of coil turns.

(h) False since the magnetic keepers are pieces of soft iron.

(i) True because copper is a non-magnetic substance which does not get attracted by a magnet and hence cannot be magnetised.