Some of the commonly known ideas regarding magnetism are:(A) It is po…

The correct answer is Option (1) → (A), (C) and (D) only

(A) It is possible to make magnets out of iron and its alloys — Correct. Iron and its alloys are ferromagnetic, so they can be magnetised strongly and made into permanent magnets or electromagnets.

(B) It is possible to isolate the north or south pole of a magnet — Incorrect. Cutting a magnet in two gives two smaller magnets, each with a north and a south pole. Isolated magnetic poles (monopoles) do not exist.

(C) A bar magnet suspended freely, points in the north-south direction — Correct. The earth's field exerts a torque on the freely suspended magnet until it lies along the field, roughly north-south.

(D) The earth behaves as a magnet with the magnetic field pointing approximately from the geographic south to the north — Correct. The earth's field is like that of a huge bar magnet whose south pole lies near the geographic north, so outside the earth the field points roughly from the geographic south towards the geographic north.

NCERT (2026-27):
Introduction – “… Some of the commonly known ideas regarding magnetism are:
(i) The earth behaves as a magnet with the magnetic field pointing approximately from the geographic south to the north.
(ii) When a bar magnet is freely suspended, it points in the north-south direction. …
(iv) We cannot isolate the north, or south pole of a magnet. If a bar magnet is broken into two halves, we get two similar bar magnets with somewhat weaker properties. …
(v) It is possible to make magnets out of iron and its alloys.”