The pair of substances which will float in a tumbler half filled with water is

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Cotton thread, thermocol

Feather, plastic ball

Pin, oil drops

Rubber band, coin

answer is B.

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Detailed Solution

Feather and the plastic ball will float in a tumbler half filled with water.
The materials that are heavy sink at the bottom and are known as sinking materials. The materials that are light, float on the surface of the water and are known as floating materials. Feather and plastic balls are light in weight and float on the surface of the water. Cotton thread first floats then sinks in water and thermocol floats on water. Pin sinks in water and oil floats on water. Coin sinks in water and rubber bands float on water.

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