Question

vi) A sealed glass tube, full of water is at a horizontal position
(shown below). A small air bubble is at the centre P of the tube.
The tube is attached to a disc, which rotates very slowly. As the
tube rotates, the ends L and M are seen alternately at the top.
How does the bubble will move?​

Answer 1

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Bubbles are comprised of gases, which have a lesser density than water. Since they are less dense, they get pushed up to the surface, and they rise, lighter than the liquid around them. This is just like helium in air; helium is lighter than air, so it rises, pushed to the top by the pressure around it.

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Answer 2

Answer:

option D

Explanation: the bubble will move back and forth between l and m