When an air bubble at the bottom of a lake rises to the top, it will
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UPSC Civil Services preparation
- Aincrease in sizeCorrect
- Bdecrease in size
- Cmaintain its size
- Dflatten into a disk-like shape
Explanation
The correct answer is A because of the relationship between pressure and volume as described by Boyles Law. When an air bubble is at the bottom of a lake, it experiences high pressure due to the weight of the entire column of water above it. As the bubble rises toward the surface, the depth decreases, which reduces the external water pressure acting on the bubble. According to physics, as pressure decreases, the volume of a gas increases provided the temperature remains relatively constant. Therefore, the air inside the bubble expands, causing it to increase in size as it reaches the top.
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