Question

a bar magnet has no marking to indicate its poles how will you find its poles, without using a magnet

Answer 1

bring another magnet close to it. if there is repulsion they are same poles, if it attracts then one is north and other south pole

Answer 2

you are given a bar magnet, then take another bar magnet with marking of north and south pole take the north pole towards the unmarked magnet, if it repels then the pole is north of unmarked magnet and if it attracts then it is the south pole of unmarked magnet
hey this may help you