A spirit level is used to determine the surface level as shown in the – McqOptions

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1.	A spirit level is used to determine the surface level as shown in the figure below. Position of the air bubble 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.
Answer» C. Air bubbles always rise.

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