Which pair of substances among the following would float in a tumbler half filled with water?

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A Cotton thread, thermocol
B Feather, plastic ball
C Pin, oil drops
D Rubber band, coin

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Answer: B. Feather, plastic ball

A feather and a plastic ball are both lighter than the water they push aside, so they stay on the surface. In the other pairs one item sinks: a pin, a coin or a soaked cotton thread goes down.

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Which pair of substances among the following would float in a tumbler half filled with water?

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