The upthrust on a piece of wood held under water will be

less than the weight of the wood piece

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more than the weight of the wood piece

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Zero

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Less than zero

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Solution

The correct option is B
more than the weight of the wood piece

Upthrust is directly proportional to the density of the fluid in which the object is immersed.
The density of water is more than that of the density of the wood.
So, upthrust on a piece of wood held under water will be more than the weight of the wood piece.
Hence, option(B) is correct.

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