Question

A beaker with a liquid of density $1.4gc{m}^{-3}$ is in balance over one pan of a weighing machine. If a solid of mass 10 g and density $8gc{m}^{-3}$ is now hung from the top of that pan with a thread and sinking fully in the liquid without touching the bottom, the extra weight to be put on the other pan for balance will be

• A. 10.0 g
• B. 8.25 g
• C. 11.75 g
• D. -1.75 g

Answer 1

Answer: (A)

Since beaker and the solid are on the same areas, the upthrust and its reaction are balanced.
Extra weight required to balance the weight of the solid = 10 g.