Question

You are given a bar magnet whose poles are not marked. Describe briefly how you will find out which end is South Pole.

Answer 1

1) using another bar magnet with markings : 
if the magnets attract each other then that end of these magnets are of opposite poles and if they repel each other then they are of the same pole.
2) using a thread: 
suspend the magnet using a thread. it will point towards north-south direction indicating the poles

Answer 2

we will suspend the bar magnet with the help of a thread .a magnet always point in the north-south direction. the geographical north pole of the earth is the magnetic south pole and the geographical south pole of the earth is the magnetic north pole. then use a magnetic compass and find the directions and mark it accordingly