Question

A block of wood is floating on oil with half of its volume submerged. If the density of oil is $840kg{m}^3$, the relative density of wood (relative to water) is :

• A. 0.84
• B. 0.42
• C. 0.21
• D. 1

Answer 1

The correct option is B 0.42

relative density=density of substance/density of water

Since the block of wood is floating on oil with half of its volume submerged,

So, relative density=(840/2)/1000=0.42