Question

A block of wood is so loaded that it just floats in water at room temperature. What change will occur in the state of floatation, if some salt is added to water?

• A. Floats with some part outside water
• B. Just floats
• C. Sinks in the water
• D. Floats completely above water

Answer 1

The correct option is A Floats with some part outside water

Floats with some part outside water.
On adding some salt to water, the density of water increases, so upthrust on block of wood increases and hence the block rises up till the weight of salty water displaced by the submerged part of block becomes equal to the weight of block.