A small aluminium rod 5 cm X 10 cm sinks when immersed in water taken in a container. Which of the following actions can be helpful in making this rod float?
(A) Adding more water to the container
(B) Reshaping the rod in the shape of a boat

Correct option is B

Adding more water to the container would not necessarily make the rod float. It would increase the amount of water displaced by the rod but would not change the rod’s volume or weight. Therefore, it would not affect the buoyant force significantly.
Reshaping the rod in the shape of a boat increases its volume without significantly increasing its weight. This increases the amount of water displaced, thereby increasing the buoyant force. If the buoyant force becomes greater than the weight of the rod, the rod will float.