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

Cotton thread, thermocol

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Feather, plastic ball

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Pin, oil drops

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Rubber band, coin

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Solution

The correct option is B
Feather, plastic ball

Feather, plastic ball:
Because feathers and plastic balls are lighter than water, they will float on it.
If an object's density is greater than that of water, it sinks.
If an object's density is less than that of water, it will float.
When the weight force of the object is balanced by the upward push of the water on the object.
If the weight force downward is greater than the upward push of the water on the object, the object will sink.
Hence, Option(B) is correct.

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