A block of wood is floating on water at 0 ° C with volume V 0 above water. When the temperature of water increases from 0 to 10 ° C , the change in the volume of the block that is above water is best described schematically by the graph.

Step-by-step solution

As temnerature of water is increased from 0 ° C to 10 ° C , density of water initially increases upto a maximum at 4 ° C and then it reduces. So, buoyant force on block of wood also increases till temperature reaches 4 ° C and then decreases from 4 ° C to 10 ° C . Hence, volume of block above water also increases upto 4 ° C and then decreases from 4 ° C to 10 ° C ∴ Variation of V 0 versus t as shown below.