Question

A piece of wood is held underwater. The upthrust on it is:

• A. equal to the weight of the wood
• B. less than the weight of the wood
• C. more than the weight of wood
• D. zero

Answer 1

The correct option is C

more than the weight of wood

1. According to Archimedes' principle, when a body is immersed in liquid then an upthrust called buoyant force acts on the body which is equal to the weight of the liquid displaced.
2. If the weight of the liquid displaced is more than the actual weight of the liquid, the body floats.
3. The upthrust should be more for the body to float.

Hence, option(C) is correct.