Question

A combination of wood and iron, just floats on the water at room temperature. What will you observe when the water is heated?

• A. The combination will float below the surface of liquid.
• B. The combination will float on the surface of the liquid.
• C. The combination will sink.
• D. None of these.

Answer 1

The correct option is C

The combination will sink.

The combination will sink because initially the density of combination is slightly less than that of water. However, on heating, the density of water decreases. Thus, upthrust becomes less than the weight of the combination and hence it sinks.