$N magnet S$ $P Q$ Attraction occurs.
$S magnet N$ $Q P$ Repulsion occurs.
(a) PQ is a magnet.
(b) PQ is not a magnet.
(c) PQ is a piece of wood.
(d) Information is incomplete, cannot give a sure answer.

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Solution

(d) Information is incomplete, cannot give a sure answer.
In the first figure, attraction occurs. But in the second figure, orientation of the magnet and 'PQ' is changed. Hence, it cannot be estimated if PQ is a magnet or not. It is not a piece of wood because magnet does not attract wood.

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N magnet S P Q Attraction occurs. S magnet N Q P Repulsion occurs. (a) PQ is a magnet. (b) PQ is not a magnet. (c) PQ is a piece of wood. (d) Information is incomplete, cannot give a sure answer.

(d) Information is incomplete, cannot give a sure answer. In the first figure, attraction occurs. But in the second figure, orientation of the magnet and 'PQ' is changed. Hence, it cannot be estimated if PQ is a magnet or not. It is not a piece of wood because magnet does not attract wood.

$N magnet S$ $P Q$ Attraction occurs.
$S magnet N$ $Q P$ Repulsion occurs.
(a) PQ is a magnet.
(b) PQ is not a magnet.
(c) PQ is a piece of wood.
(d) Information is incomplete, cannot give a sure answer.

(d) Information is incomplete, cannot give a sure answer.
In the first figure, attraction occurs. But in the second figure, orientation of the magnet and 'PQ' is changed. Hence, it cannot be estimated if PQ is a magnet or not. It is not a piece of wood because magnet does not attract wood.