66. A piece of wood is held under water. The upthrust on it will be: A.Equal to the weight of the wood B.Less than weight of the wood C.More than weight of the wood D.Zero
Option C Solution: Following the density principle, the density of the egg compared to the density of the tap water is lesser (the density principle states that an object or substance with lesser density will float on the surface of the substance or object which has the greater density). Now, with salt, salt makes the density of the tap water to increase and increases also the salinity of the water making the egg float because the density of the water with salt is now greater than the density of the egg and that is why an egg sinks in soft water but floats in a concentrated solution of salt.
Option B Solution: Since wooden piece is to float on water, upthrust acting on it under water is greater than the weight of the wooden piece.
