Question

tell the answer of 3 rd question

Answer 1

We can simply suspend it with help of thread
After that the north pole of magnet will point toward north and south towards south.

Answer 2

Use a compass to indentify the polesof your magnets. The south pole on the compass points to the north pole of the magnet. The north pole on the compass points to the south pole of the magnet. The north arrow on the compass points to the south pole of the magnet.