Q. A boat carrying a number of large stones is floating in a water tank. What would happen to the water level, if a few stones are unloaded into water?
A) Rises
B) Falls
C) Remains unchanged
D) Rises till half the number of stones are unloaded and the begins to fall
Explanation
(b) From Archimedes’ principle weight of water displaced is equal to weight of stone. The level will fall because when the large stone was in the boat, volume of water displaced is equal to volume of large stone. But when the stone is dropped in the lake, it displaces volume of water equal to its volume which is less than in the previous case.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.