The sensitivity of a level tube increases with:
AIncrease in the viscosity of the liquid
BDecrease in the diameter of the tube
CIncrease in the radius of curvature of the bubble tube
DDecrease in the length of the bubble tube
Explanation
The sensitivity of a level bubble tube increases with an increase in the internal radius of curvature of the tube, increase in tube diameter/length, and decrease in liquid viscosity/surface tension.
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