Why does the air bubble at the centre of the tube move to the right when the surface is inclined?
A) The forces acting on the air bubble are in equilibrium.
B) Unbalanced forces act on the air bubble.
C) Air bubbles always rise.
D) Frictional force act on the air bubble.
Correct Answer: B
Solution :
In a spirit level, the pressure of the liquid that acts on the air bubble in all directions is balanced when the surface is horizontal. When it is inclined, the pressure is unbalanced which results in the movement of the air bubble to the right side.
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