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Q.

Is it true that a block of plastic released under water does not come up to the surface water?


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a

True

b

False 

answer is B.

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Detailed Solution

The above statement is false.
The upward push of the water on a submerged object is called a buoyant force. The block of plastic comes up due to the buoyant force of water. We know that the density of water is greater than the density of the plastic block. So, the buoyant force of the water on the plastic is greater than the weight of the plastic, and hence the buoyant force pushes the ball to the surface of the water.
The correct statement would be that a block of plastic released under water comes up to the surface water.
 
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