If a small cotton ball is placed in a bowl filled with water, will it float or sink?

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First float then sink.

First sink then float.

It will only float.

It will only sink.

answer is A.

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Detailed Solution

If a small cotton ball is placed in a bowl filled with water, it will first float and then sink.
When an object is placed on the surface of the water, it floats or sinks for two reasons. An item sinks in water if its density is greater than that of water. An item floats in water if its density is less than that of water. The cotton ball initially floats on water, but when the water is absorbed by the cotton by capillary action and the air particle is replaced by water, it grows heavier and gradually sinks.

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