An iron block is on a boat which floats in a pond. The block is thrown into the water. The level of water in the pond will be
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When iron block was floating, it displaces 
volume of water such that weight of this 
volume of water is equal to weight of block. But since density of iron is more than density of water, this volume 
will be greater than volume 
of iron block. When iron block sinks in the pond, it displaces water of volume equal to its own volume 
.
Since 
, displaced volume in first case was more than displaced volume in second case. Hence, level will fall.
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