. Assertion A thin stainless steel needle can lay floating on a still water surface

Reason Any object floats when the buoyancy force balances the weight of the object.


Best Answer

Answe: (c)

Solution : When a thin steel needle is laid on surface of water, it sinks as upward force deu to buoyancy does not support its weight. But when needle is laid carefully on a still water surface then due to surface tension of water molecules it displaces as much amount of water as its weight. Thus, due to buoyancy force and surface tension it floats on water surface. Hence option (c) is true.


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