Solution:
A steel Katori placed carefully on the surface of the water would float. The explanation is uncomplicated, The weight of water displaced by the Katori is more than the weight of Katori so it permits Katori to float on water. An iron nail will sink because it displaces less water and weighs more. Similarly, a spoon and a bottle filled with water would sink because it weighs more than the weight of the water displaced by them.