Question:
Two solid pieces, one of steel and the other of aluminium when immersed completely in water have equal weights. When the solid pieces are weighed in air
Two solid pieces, one of steel and the other of aluminium when immersed completely in water have equal weights. When the solid pieces are weighed in air
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Weight in air is the "true" weight; weight in water is the "apparent" weight.
Updated On: Apr 10, 2026
- the weight of aluminium is half the weight of steel
- steel piece will weigh more
- they have the same weight
- aluminium piece will weigh more
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The Correct Option is A
Solution and Explanation
Step 1: Buoyancy
When immersed in water, objects experience an upward buoyant force equal to the weight of water displaced.
Step 2: Density Comparison
Steel is much denser than aluminium. For equal weights in water, the volumes and initial masses must differ.
Step 3: Atomic Weight
Atomic weight of Iron (Steel) is 56 and Aluminium is 27. Based on their relative densities and the given equilibrium in water, the aluminium piece weighs approximately half as much as the steel piece in air.
Final Answer: (a)
When immersed in water, objects experience an upward buoyant force equal to the weight of water displaced.
Step 2: Density Comparison
Steel is much denser than aluminium. For equal weights in water, the volumes and initial masses must differ.
Step 3: Atomic Weight
Atomic weight of Iron (Steel) is 56 and Aluminium is 27. Based on their relative densities and the given equilibrium in water, the aluminium piece weighs approximately half as much as the steel piece in air.
Final Answer: (a)
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