It was observed that a pencil sharpener gets attracted by both the poles of a magnet although its body is made up of plastic. How?

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Solution

The blade of a pencil sharpener is made of iron. Since, iron is a magnetic material, the pencil sharpener gets attracted towards a magnet.

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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.

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Q. A magnet was brought from different directions towards a toy boat that has been floating in water in a tub. The Effect 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
Boat gets attracted towards the magnet	Boat is fitted with a magnet with a north pole towards its head
Boat is not affected by the magnet	Boat is fitted with a magnet with a south pole towards its head
Boat moved towards the magnet when the north pole is brought near its head	Boat has a small magnet fixed along its length
Boat moves away from the magnet when the north pole is brought near its head	Boat is made up of magnetic material
Boat floats without changing its direction	Boat is made up of non-magnetic material

Q. A magnet was brought from various directions towards a toy boat that was floating in a water tub. The observed effect in each case is mentioned in Column I. Possible reason for the observed effects are mentioned in Column II. Match the statements in Column I and Column II. [5 MARKS]

\begin{matrix} Column I & Column II Boat gets attracted towards the bar magnet. & Boat is fitted with a bar magnet with north pole towards its head. Boat is not affected by the magnet. & Boat is fitted with a bar magnet with south pole towards its head. Boat moves towards the magnet if north pole of the magnet is brought near its head. & Boat has a small magnet fixed along its length. Boat moves away the magnet if north pole of the magnet is brought near its head. & Boat is made of magnetic material Boat floats without changing its direction. & Boat is made of non-magnetic material \end{matrix}

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