Question

A combination of wood and iron, just floats in the water at room temperature. Explain what you will observe when the water is heated.

• A. The combination will still float with same position.
• B. The combination will float on the surface of the liquid.
• C. The combination will sink.
• D. None of the above.

Answer 1

The correct option is C

The combination will sink.

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