(i) The chapter explains in Activity 4.5 that unlike poles (North-South) attract each other while like poles (North-North or South-South) repel each other. (ii) As stated in section 4.1, 'The materials which are attracted towards a magnet are called magnetic materials.' Iron, nickel, and cobalt are examples of magnetic materials. (iii) The chapter states that 'A freely suspended magnet comes to rest along the north-south direction' and 'The needle of a magnetic compass indicates the north-south direction.' (iv) The chapter clearly states that 'A magnet has two poles—the North pole and the South pole' and 'A single North pole or a single South pole cannot exist.'